Living model of the oligodendrocyte: the cell. Zoom between the stages.Morphology after Peters, Palay and Webster, The Fine Structure of the Nervous System (1991); Nave and Werner, Annu Rev Cell Dev Biol 2014; Chong et al., PNAS 2012 (internode counts per cell).
Oligodendro, at your service. Everything known about the oligodendrocyte, and rather more about myelin than is strictly decent. What would you like?
The oligodendrocyte is a glial cell of the central nervous system whose principal function is to produce myelin, the lipid-rich membrane that wraps around axons in concentric layers and enables fast, energy-efficient signal transmission. A single oligodendrocyte extends processes to myelinate up to fifty separate axon internodes, a reach that has no parallel in the peripheral nervous system. Beyond insulation, oligodendrocytes supply lactate and pyruvate to axons through monocarboxylate transporters, providing metabolic support that is required for long-term axon survival. When myelin is lost, as in multiple sclerosis, oligodendrocyte precursor cells can be recruited to rebuild it, though this capacity declines with age and fails entirely in chronic lesions. (Nave KA, Werner HB. Myelination of the nervous system: mechanisms and functions. Annu Rev Cell Dev Biol. 2014;30:503-33. PMID: 25288117. https://pubmed.ncbi.nlm.nih.gov/25288117/; Funfschilling U et al. Glycolytic oligodendrocytes maintain myelin and long-term axonal integrity. Nature. 2012;485:517-21. PMID: 22622581. https://pubmed.ncbi.nlm.nih.gov/22622581/)
Mouse. Small axons left without compact myelin in Teneurin-4 knockouts still survive at a year; four 14-3-3 isoforms rise in them, and blocking 14-3-3 hastens their damage.
Comprehensive review of OPC roles beyond myelin repair: regulation of neuronal circuit activity, immune surveillance, vascular remodelling, and metabolic support
Neuroligin-3 binds NG2/CSPG4 on OPCs to activate integrin-mediated mechanotransduction, sustaining progenitor state; the same pathway is co-opted by glioma
Mouse. After a paw injury, spinal oligodendrocytes switch from making myelin protein to making lipid, axons suffer, and neuronal amyloid-beta42 builds; blocking it prevented the pain becoming chronic.
T3 availability is required for OPC-to-oligodendrocyte differentiation; MCT8 deficiency causes persistent hypomyelination and reduced Olig2+ cells at all developmental stages
Review integrating the oligodendrocyte-specific MCT relay into a broader astrocyte-neuron lactate shuttle model; covers concentration-dependent effects and epigenetic consequences of lactate in CNS disease.
Human hippocampal tissue and THY-Tau22 mice. ENT1 inhibition disrupts oligodendrocyte lipid metabolism; myelinating oligodendrocytes are proposed as a metabolically vulnerable hub linking adenosine signaling to network disconnection in tauopathy.
Clemastine fumarateantihistamine with antimuscarinic action
acts on muscarinic receptors (M1 and M3)
Promotes oligodendrocyte precursor differentiation and remyelination. In the ReBUILD crossover trial the primary endpoint was met: visual evoked potential latency delay reduced by 1.7 ms per eye (95% CI 0.5 to 2.9, p = 0.0048); fatigue was associated, no serious adverse events.
dose: trial dose not stated in the abstract · human, 50 patients with multiple sclerosis · randomised double-blind placebo-controlled crossover trial, 150 days · Green AJ, Gelfand JM, Cree BA, Bevan C, Boscardin WJ, Mei F et al. Clemastine fumarate as a remyelinating therapy for multiple sclerosis (ReBUILD): a randomised, controlled, double-blind, crossover trial. Lancet. 2017;390:2481-2489. PMID: 29029896. · source
Clemastineantihistamine with antimuscarinic action
acts on muscarinic receptors, ERK1/2, Myrf and Olig2
Promotes OPC differentiation through muscarinic receptors and ERK1/2 activation with increased Myrf and Olig2; blocked by ERK inhibition (U0126) and reduced by the muscarinic agonist cevimeline.
dose: not stated in the abstract · rat, spinal cord injury · in vivo pharmacology · Tong LY, Deng YB, Du WH, Zhou WZ, Liao XY, Jiang X. Clemastine Promotes Differentiation of Oligodendrocyte Progenitor Cells Through the Activation of ERK1/2 via Muscarinic Receptors After Spinal Cord Injury. Front Pharmacol. 2022;13:914153. PMID: 35865954. · source
Screening 1,000 bioactive molecules on micropillar arrays identified a cluster of antimuscarinic compounds that enhance oligodendrocyte differentiation and remyelination.
dose: screen concentrations not stated in the abstract · rodent OPCs in vitro (species not stated in the abstract) · high-throughput micropillar screen · Mei F, Fancy SPJ, Shen YA, Niu J, Zhao C, Presley B et al. Micropillar arrays as a high-throughput screening platform for therapeutics in multiple sclerosis. Nat Med. 2014;20:954-960. PMID: 24997607. · source
Benztropineanticholinergic
acts on direct antagonism of M1 and/or M3 muscarinic receptors
Among the most effective compounds in an image-based screen for myelin basic protein expression; decreases clinical severity in EAE alone or with approved immunosuppressants; efficacy from enhanced remyelination, not immune suppression (cuprizone model, T-cell assays).
dose: not stated in the abstract · rat optic nerve OPCs in vitro; mouse EAE and cuprizone models · screen plus in vivo models · Deshmukh VA, Tardif V, Lyssiotis CA, Green CC, Kerman B, Kim HJ et al. A regenerative approach to the treatment of multiple sclerosis. Nature. 2013;502:327-332. PMID: 24107995. · source
Miconazoleantifungal
acts on mitogen-activated protein kinase signalling in OPCs
Increases new oligodendrocytes and enhances remyelination in lysolecithin lesions; reverses disease severity at the peak of EAE; acts directly as a remyelinating drug with no immune effect; enhances human oligodendrocyte generation from human OPCs in vitro.
dose: not stated in the abstract · mouse; human cells in vitro · in vivo lesion models and in vitro · Najm FJ, Madhavan M, Zaremba A, Shick E, Karl RT, Factor DC et al. Drug-based modulation of endogenous stem cells promotes functional remyelination in vivo. Nature. 2015;522:216-220. PMID: 25896324. · source
Clobetasolglucocorticoid
acts on glucocorticoid receptor signalling in OPCs
Same remyelinating effects as miconazole in lysolecithin and EAE models, and a potent immunosuppressant as well; enhances human oligodendrocyte generation in vitro.
dose: not stated in the abstract · mouse; human cells in vitro · in vivo lesion models and in vitro · Najm FJ, Madhavan M, Zaremba A, Shick E, Karl RT, Factor DC et al. Drug-based modulation of endogenous stem cells promotes functional remyelination in vivo. Nature. 2015;522:216-220. PMID: 25896324. · source
RNA-seq analysis of single cells of the oligodendrocyte lineage from nine distinct regions of the anterior-posterior and dorsal-ventral axis of the mouse juvenile central nervous system
Marques S et al. 2016, Science · paper · public at NCBI GEO; NCBI data are free to use with attribution, no licence text of its own · accession resolved 2026-09-12 via eutils esummary
Molecular Architecture of the Mouse Nervous System (atlas site)
Zeisel A et al. 2018, Cell · paper · site answered (301 to its current address); data terms to be read on the site before reuse · accession resolved 2026-09-12
Transmission electron micrograph of a myelinated axon in transverse section. The concentric myelin lamellae are visible surrounding the axon core. The myelin sheath is produced by an oligodendrocyte in the CNS. · user:Roadnottaken (Wikimedia Commons) · CC BY-SA 3.0Electron micrograph of an ependyma-derived oligodendrocyte. From Meletis et al., showing the ultrastructure of an oligodendrocyte that arose from ependymal cells after spinal cord injury. · Meletis K, Barnabe-Heider F, Carlen M, Evergren E, Tomilin N et al. (Wikimedia Commons) · CC BY 4.0TEM of transverse sections of rat spinal cord showing remyelination of spared axons by iPS-derived OPCs after contusive SCI. Thin remyelinating sheaths are visible around axons. · All AH, Gharibani P, Gupta S, Bazley FA, Pashai N, Chou BK et al. (Wikimedia Commons) · CC BY 4.0Confocal image of oligodendrocytes in adult mouse brain stained with the Rip antibody (green). Cell nuclei are counterstained with DAPI (blue). The branching processes characteristic of myelinating oligodendrocytes are visible. · Oleg Tsupykov (Wikimedia Commons) · CC BY-SA 4.0Semithin sections of lesioned cerebellar white matter showing that remyelination is dependent on NMDA receptor activation. Remyelinating axons show thin myelin sheaths characteristic of newly formed oligodendrocyte internodes. · Lundgaard I, Luzhynskaya A, Stockley JH, Wang Z, Evans KA, Sibson N et al. (Wikimedia Commons) · CC BY 4.0Ependymal cell-derived progeny after spinal cord injury. The image shows ependymal-derived cells immunoreactive for oligodendrocyte markers, demonstrating that ependymal cells can contribute oligodendrocytes to the injury response. · Meletis K, Barnabe-Heider F, Carlen M, Evergren E, Tomilin N et al. (Wikimedia Commons) · CC BY 4.0Bright field microscopy showing the stages of oligodendrocyte differentiation from human iPSCs (BC1 line). The progression from OPC to immature and then mature oligodendrocyte can be followed by the elaboration of processes and flattening of the cell body. · All AH, Gharibani P, Gupta S, Bazley FA, Pashai N, Chou BK et al. (Wikimedia Commons) · CC BY 4.0Immunofluorescence of oligodendrocytes differentiated from human iPSCs. O4 (green) marks the oligodendrocyte surface; MBP (red) marks myelin basic protein. The two markers co-localise in mature oligodendrocytes. · Yamashita T, Miyamoto Y, Bando Y, Ono T, Kobayashi S, Doi A et al. (Wikimedia Commons) · CC BY 4.0Monkey ESC-derived OPCs (CMK6SFF) co-cultured with rat DRG neurons demonstrate myelinogenic potency in vitro. MBP-positive (red) myelin segments wrap along axons. · Yamashita T, Miyamoto Y, Bando Y, Ono T, Kobayashi S, Doi A et al. (Wikimedia Commons) · CC BY 4.0OPCs and oligodendrocytes differentiated from human iPSCs (A3 line). Fluorescence images show the differentiation protocol outcome and marker expression. · Yamashita T, Miyamoto Y, Bando Y, Ono T, Kobayashi S, Doi A et al. (Wikimedia Commons) · CC BY 4.0Indirect immunofluorescence defining the early stages of oligodendrocyte differentiation from iPSCs into neural progenitors (NP) and glial progenitors (GP). · All AH, Gharibani P, Gupta S, Bazley FA, Pashai N, Chou BK et al. (Wikimedia Commons) · CC BY 4.0NIH BioArt illustration of an oligodendrocyte showing its branching processes, which wrap around multiple axons to form the myelin sheath. Public domain image courtesy of NIAID. · Courtesy of NIAID / Ryan Kissinger (Wikimedia Commons) · Public domainScientific illustration showing the four types of glial cells in the CNS: ependymal cells, astrocytes, microglia, and oligodendrocytes. The oligodendrocyte is shown with processes wrapping around axons. · Artwork by Holly Fischer (Wikimedia Commons) · CC BY 3.0Overview of the segmentation approach for electron microscopic data. a, Preprocessed transmission electron microscopic data of human corpus callosum (CC). b, Semantic prediction of the preprocessed data by the trained DenseNet, returning a likelihood of each pixel to belong to either background (violet), axon (teal), or myelin (yellow). c, Post-processed final segmentation. Each instance of a fiber (axon and myelin sheath) is labelled with a different random color. d–f, Analogous to a–c, with transmission electron microscopic data of human superficial white matter (SWM). The dashed region in f is shown in g,h. The measurement of axon (g) and myelination (h) diameters is based on ellipses fitted to each structure. Points show the centroid of each structure, axes show half of the minor axis of the fitted ellipse for the axon (solid line) and myelin (dashed line). i, Measurements (SWM: n = 220,431, CC: n = 163,133) from g, h are used for statistical assessment of local ultrastructure. We treat the short axis (half of which is shown in yellow in g, h) of the fitted ellipse as the actual diameter of each structure. All scale bars are 2 µm. · Ruthig, von der Planitz, Morozova et al 2025, PLOS Biology · CC BY 4.0IFN-responsive oligodendrocytes localize to aged white matter close to CD8+ T cells. a, Immunofluorescence staining and quantification of C4b, Serpina3n, B2m and STAT1 in CC1+ oligodendrocytes in the white matter of 3- and 24-month-old mice (C4b+CC1+, 3-month, n = 3, 24-month, n = 5; Serpina3n+CC1+, 3-month, n = 6, 24-month, n = 4; B2m+CC1+, 3-month, n = 4, 24-month, n = 4; STAT1+CC1+, 3-month, n = 5, 24-month, n = 5; data are mean ± s.e.m.). Scale bar, 20 µm; for B2m, 10 µm. · Kaya, Mattugini, Liu et al 2022, Nature Neuroscience · CC BY 4.0Effects of repeated sevoflurane exposure on OPC proliferation, differentiation, and myelination in neonatal mice. (A) IF staining of PDGFRα (green) and BrdU (red) in the hippocampal CA1 region. Colocalized cells (yellow) are indicated by white arrows, and nuclei were counterstained with DAPI (blue) (scale bar = 100 μm). (B) Quantitative analysis of PDGFRα+ cells and PDGFRα+/BrdU+ double-positive cells; n = 3 mice/group. (C) IF staining of Olig2 (red) and CC1 (green) in the hippocampal CA1 region. Colocalized cells (yellow) are indicated by white arrows, and nuclei were counterstained with DAPI (blue) (scale bar = 100 μm). (D) Quantitative analysis of Olig2+ cells and Olig2+/CC1+ double-positive cells; n = 3 mice/group. (E) WB analysis of PDGFRα protein expression in hippocampal tissue. (F) Quantitative analysis of PDGFRα protein band intensity; n = 3 mice/group. (G) WB analysis of Olig2 and CNPase protein expression in hippocampal tissue. · Liu, Bai, Liu et al 2026, CNS Neuroscience & Therapeutics · CC BY 4.0MBP immunoreactivity in the p15 and p28 cerebellum. a–d The p15 cerebellum is characterized by intensive immunoreactivity for MBP throughout the WM. The density of MBP-positive fibers also increased within the DCN (star in a) and the IGL of all lobules. In the proximal parts of the lobules, MBP-positive fibers are found almost up to the PCL (a, c). Distally, MBP-positive fibers do not yet reach the PCL (b, d). At the tips of the lobular WM, MBP-positive fibers branch radially in all directions (b). Arrowheads in c and d point out MBP-positive fibers running more or less parallel to the PCL. e, f In the p28 cerebellum, many MBP-positive fibers ascend through the IGL up to the PCL. Whereas they emanate at flat angles from the white matter in proximal parts of the lobules (e), more distally, · Groteklaes, Bönisch, Eiberger et al 2020, Cerebellum (London, England) · CC BY 4.0Age-related changes in the intensity of MBP signals in the macaque brain. A, Schematic diagram illustrates the role of MBP in maintaining myelin sheath integrity. B, Representative images of immunohistochemistry (IHC) showing MBP signals (brown) in Brodmann areas BA46 and BA9, as well as layer 1 of the prefrontal cortex (PFC) in macaques at ages 5, 10, 15, and 30 years. Scale bar as indicated. C, Relative intensities of IHC MBP signals shown in panel B were quantified using ImageJ. Data are presented as mean ± SD (n = 5 macaques per age group; * p = 0.0038, unpaired t test). · Zhang, Yao, Lv et al 2026, eNeuro · CC BY 4.0Prophylactic OM-MOG prevents the development of spinal cord neuropathology during MOG-EAE in DR2b.Ab° mice. Neuropathological analysis of spinal cord sections from prophylactic vehicle- (upper and middle panels) and OM-MOG-injected (lower panels) DR2b.Ab° mice on day 36 post-immunization for EAE. Inflammatory cell infiltration was visualized by H&E (A, D); demyelination by Luxol fast blue [(B) and enlarged inset, (E)]; axon damage by Bielschowsky's silver staining [(C) and enlarged inset, (F)]. Vehicle-treated mice show large confluent inflammatory, demyelinating lesions with axon damage typical of MOG-EAE (arrowheads). OM-MOG-vaccinated mice showed no spinal cord pathology. Scale bars 500 μM (A–F), 100 μM enlarged inserts in middle panels. · Dagkonaki, Avloniti, Evangelidou et al 2020, Frontiers in Immunology · CC BYTDAG8 deficiency does not affect normal myelination in the mouse brain. A. The mRNA analysis of pdgfrα, cnpase and mbp expression in whole brain homogenates did not reveal differences between the TDAG8 KO and WT mice. B. Representative images of immunohistochemically stained WT and TDAG8 KO mice brains (cerebellum) show no differences in myelination between the two genotypes. · Caratis, Opiełka, Hausmann et al 2024, PLOS ONE · CC BY 4.0Defective myelination in the ATRX-null mouse forebrain. d Immunofluorescence microscopy of P20 brain cryosections stained with anti-MOG (green) and anti-MBP (red) antibodies confirms decreased levels of these myelin proteins in the cortex (Ctx) and corpus callosum (CC) of the forebrain of AtrxFoxG1Cre mice compared to controls (Ctrl) (n = 3 animals for each genotype). · Rowland, Jiang, Shafiq et al 2023, Nature Communications · CC BY 4.0miR-145-5p is upregulated in chronic lesion tissue from SPMS brains. a, b Luxol fast blue/hematoxylin and eosin stained human brain tissue from healthy control white matter (HCWM), and normal appearing white matter (NAWM), active and chronic inactive lesion tissue from SPMS brain. a Scale bar = 1 mm. b Magnified from (a); scale bar = 50 µm. · Kornfeld, Cummings, Yaworski et al 2024, Communications Biology · CC BY 4.0CNP-1 immunoreactivity in the early postnatal mouse cerebellum (p0–p6). a CNP-1-positive cells in the p4 cerebellar anlage are roundish and may be found in the velum medullare (arrowheads in a) and the anteriormost parts of the cerebellar anlage. Sagittal section close to the midline; anterior is to the left. b In the brainstem, CNP-1-positive structures have a fibrous morphology at this age. c, d CNP-1-positive cells at p6. Immunoreactive cells can again be detected in the velum medullare (arrowhead in c). They can now also be seen in the nascent central WM and the nascent WM extending into t · Groteklaes, Bönisch, Eiberger et al 2020, Cerebellum (London, England) · CC BY 4.0Astrocytic Nrf2 and cholesterol pathways are altered in chronic human brain lesions with poor remyelination potential and oligodendrocyte death. a Nrf2+ (yellow) astrocytes (GFAP+; cyan) (arrows) with Hoechst in blue. Scale bar, 100 μm. e Active caspase-3+ (yellow) oligodendrocytes (TPPP/p25+; cyan, and Olig2+; magenta) (arrows) in control (CT), remyelinated (RM), active (A) and inactive lesions (I) from multiple sclerosis (MS) cases. · Molina-Gonzalez, Holloway, Jiwaji et al 2023, Nature Communications · CC BY 4.0No detectable gross abnormality in oligodendrocyte development in Zdhhc9 KO mice. ( A ) Fluorescent (upper) an · Jeong, Gonzalez-Fernandez, Crawley et al 2025, eLife · CC BY 4.0Neural precursors form compact myelin sheaths after transplantation into adult or neonatal Plp1-tg mice. ( A ) Light microscopy image of beta galactosidase-positive cells in the corpus callosum (delineated) of a Plp1-tg transplant recipient, 14 days post transplantation. ( B ) Corpus callosum of another transplant recipient showing that transplanted GFP-positive neurospheres form MBP-positive myelin. ( C and D ) Electron micrographs showing that the transplanted cells generate oligodendrocytes that wrap axons with normal-appearing myelin sheaths in which the inner tongue (black arrow), periaxonal space (arrowhead) · Gruenenfelder, McLaughlin, Griffiths et al 2020, Brain · CC BY 4.0Anti-Olig2 staining of the white matter of a healthy older individual: Both strongly (arrows) and weakly Olig2-positive nuclei are identified. · Stork L, Stephan J, Kutllovci A et al. Impaired remyelination in late-onset multiple sclerosis. Acta Neuropathol. 2025. PMID 40167776 · CC BY 4.0Histopathology of different demyelinating lesion activities. Panels a-c illustrate an early active demyelinating lesion, representing the initial stage of demyelination. At this stage, degradation products from both major (e.g., MBP) and minor (e.g., MAG) myelin proteins are present within phagocytes. a LFB/PAS staining reveals a demyelinated lesion containing multiple foamy macrophages. The inset shows an enlarged microscopic image of foamy macrophages with LFB-positive myelin debris; b Anti-myelin basic protein (MBP) staining of the early active lesion reflects myelin destruction and highlights numerous macrophages filled with myelin degradation products; c Anti-myelin-associated glycoprotein (MAG) staining also shows multiple macrophages containing MAG-positive degradation products, a minor myelin protein. Panels d-f depict a late active demyelinating lesion, representing the subsequent stage of demyelination, where only degradation products from major myelin proteins (e.g., MBP) can be identified within phagocytes. d LFB/PAS staining shows a completely demyelinated lesion with reactive astrogliosis and foamy macrophages; e Anti-MBP staining reflects an advanced stage of demyelination, with only a few macrophages containing MBP-positive degradation products (see inset for MBP-positive macrophages); f In contrast, no degradation products from minor myelin proteins, such as MAG, are detected within macrophages, as demonstrated by anti-MAG staining. Panels g-i present an inactive demyelinated lesion, where no active demyelination processes are observed. g LFB/PAS staining reveals a demyelinated lesion accompanied by reactive astrogliosis and foamy macrophages; h Anti-MBP staining shows newly formed, thin myelinated fibers, indicating early remyelination. However, no myelin degradation products are observed within macrophages; i Anti-MAG staining also identifies early remyelination. LFB/PAS Luxol fast blue/periodic acid-Schiff, MBP myelin basic protein, MAG myelin-associated glycoprotein, Scale bars: a, d and g 200 um; b, f and i 50 um; e and h 100 um; c 20 um · Stork, Stephan, Kutllovci et al 2025, Acta Neuropathologica · CC BY 4.0H&E stain of human brain autopsy tissue (formalin-fixed, paraffin-embedded) showing oligodendrocytes with the classic fried-egg appearance: round pale perinuclear halo from formalin fixation artefact, small dark nucleus. High magnification. · Jensflorian (Wikimedia Commons) · CC BY-SA 4.0Confocal fluorescence image of rat oligodendrocyte precursor cells (OPCs). NG-2-positive OPCs in green, GFAP-positive astrocytes in red, nuclei counterstained with Hoechst 33342 in blue. Two distinct cell types from a mixed glial culture. · Oleg Tsupykov (Wikimedia Commons) · CC BY-SA 4.0Confocal image of oligodendrocytes in rat brain stained for MBP (myelin basic protein, red) and DNA/nuclei (DAPI, blue). Two oligodendrocyte cell bodies are visible; myelinated axons appear as hollow 'tramlines' because MBP is absent from the axon core. · GerryShaw / EnCor Biotechnology (Wikimedia Commons) · CC BY-SA 4.0Myelin characterization in the cerebellum of WT and ASMko mice. (A) Electron micrographs of white matter from cerebellar lobules of WT and ASMko mice at P10, P20, and P90. Red asterisks indicate intracellular accumulation of electron-dense lipid droplets in ASMko samples; by P90, signs of fiber degeneration and axonal loss become evident (yellow arrowheads). Only transverse sections of myelinated fibers with intact axonal morphology and normally compacted myelin were included for g-ratio measurements. Scale bar: 10 um. (B) Graphs show mean +/- SEM g-ratio of myelin thickness of wt and ASMko mice at P10, P20, and P90; P10: Statistical analysis was performed using two-tailed t test. n = 4 wt, 3 ASMko, P = 0.857; P20: n = 3 per genotype, P = 0.459; P90: n = 5 per genotype, P = 0.853. (C) Scatter plot showing the relationship between g-ratio and axon diameter (< 3 um) in wt and ASMko mice. Linear regression analyses reveal no significant differences between genotypes. More than 150 fibers were analyzed from at least three mice per genotype. · Guerrero-Valero, Melgarejo, Marchena et al 2026, EMBO Molecular Medicine · CC BY 4.0Impaired differentiation of ASMko OL. ( A ) Schematic representation of the OL lineage, illustrating the progressive morphological transition from bipolar OPCs through pre-myelination OLs to highly branched, mature, and myelinating OLs, together with the stage-specific markers used in this study (Olig2, NG2, PDGFRalpha, A2B5, CNPase, O1, MBP). These markers identify successive maturation states, with Olig2 labeling the entire lineage. ( B - D ) Representative immunofluorescence images of Olig2 ( B ), NG2 ( C ), and CNPase ( D ) in the apical region of cerebellar lobules from WT and ASMko mice at P90. Scale bar: 50 um. ( E ) Representative immunofluorescence images of MBP in the retina of WT and ASMko mice after transplantation of WT or ASMko OLs onto RGCs. Scale bar: 50 um. ( G ) Representative immunofluorescence images of NG2 in 4-day differentiated OL cultures from WT or ASMko OLs treated with vehicle, and in WT OLs treated with SM. Scale bar: 50 um. ( H ) Representative immunofluorescence images of MBP in 4-day differentiated OL cultures from WT or ASMko OLs treated with vehicle, or in WT OLs treated with SM. Scale bar: 50 um. · Guerrero-Valero, Melgarejo, Marchena et al 2026, EMBO Molecular Medicine · CC BY 4.0Emodin promotes OL lineage progression in the CC and hippocampal DG in VD rats. (A, B) Representative images of double-staining for NG2 and Ki67 in the CC and DG. DAPI (nuclei, blue), NG2 (OPCs, red), Ki67+ (proliferating cells, green). White arrows indicate NG2+Ki67+ proliferating OPCs. High-magnification images were taken from the CC and DG separately. Scale bar: 20 um. (C, D) The ratio of the number of NG2+Ki67+ cells to that of NG2+ cells (%) in the CC and the DG. (E, F) The ratio of the number of Olig2+CC1+ cells to that of Olig2+ cells (%) and average number of CC1+ cells per mm2 in the CC and DG regions. (G, H) Representative images of double-staining for Olig2 and CC1 in the CC and DG of the hippocampus. DAPI (nuclei, blue), Olig2 (oligodendrocyte lineage cells, green), CC1 (mature OLs, red). White arrows indicate Olig2+CC1+ mature OLs. (**p < 0.01, ***p < 0.001 vs. Control; ##p < 0.01, ###p < 0.001 vs. VD. Data are represented as mean +/- SEM, n = 5-6 rats per group, 3 brain slices per animal; CC, corpus callosum; DG, dentate gyrus). · Wang, Dong, He et al 2026, CNS Neuroscience and Therapeutics · CC BY 4.0GDF11 promotes OPC differentiation and maturation in vitro. (A) Representative bright-field image of purified OPCs from mouse pup brains and immunofluorescence staining of Olig2 (red) with DAPI (blue) for purity assessment. Scale bar, 100 um. (B) OPCs were treated with vehicle (Veh) or GDF11 for 48 h, and cell viability was assessed by MTT assay. Data are presented as mean +/- SEM from three independent experiments (each with six technical replicates per group). (C) Real-time PCR analysis of Mbp and Cnp mRNA levels in OPC cultures after GDF11 or Veh treatment ( n = 3 independent experiments). (D) Representative immunofluorescence images of OPC differentiation after treatment with GDF11 (100 ng/mL) or Veh. Scale bar, 100 um. (E) Quantification of the relative proportion of maturing OLs after GDF11 (100 ng/mL) or Veh treatment ( n = 3 independent experiments). (F) Representative immunofluorescence images of MBP (red) showing membrane sheet area (outlined by dashed boxes) and quantification of MBP + membrane sheet area after GDF11 (100 ng/mL) or Veh treatment ( n = 3 independent experiments). The data are presented as mean +/- SEM. ** p < 0.01, *** p < 0.001; ns, not significant. · Zhang, Yan, Huang et al 2026, CNS Neuroscience & Therapeutics · CC BY 4.0In vitro and in vivo differentiation of iNPC-derived OPCs into mature and myelinating oligodendrocytes. (A) Representative FACS plots for CD140a and O4 at day 48. Their expression was analyzed by flow cytometry. (B) Morphological change from OPC to mature oligodendrocyte. The dotted box indicates the area enlarged below, showing multiple elongated and highly branched processes. Scale bars: 200 um. (C) Immunofluorescence analysis of MBP+ cells in CD140a+, CD140a+/O4+ and O4+ cells at day 5 of maturation. DAPI was used as a nuclear counterstain. Scale bar: 50 um. (D) Quantification of MBP+ cells in CD140a+, CD140a+/O4+ and O4+ cells (n = 4). * p < 0.05; ns, not significant (one-way ANOVA). (E) Immunofluorescence analysis of MBP+ and PLP1+ cells ensheathing nanofibers merged with bright field and DAPI. Scale bars: 20 um. (F) Quantification of ensheathed MBP+/PLP1+ cells on nanofibers (n = 6). DAPI was used as a nuclear counterstain. · Park, Kang, Kim et al 2026, Cells · CC BY 4.0Myelin sheath onset and ultrastructure is not impacted by Piezo1 loss. A) Electron microscopy images of ventral cervical spinal cord of control (fl/fl) and Piezo1 cKO mice. Scale = 1 um. B) The percent of myelinated axons is unchanged at P5 (p = 0.40), P15 (p = 0.38), and P30 (p = 0.48). n = 3-4 mice, >300 axons/mouse. C) Average myelin sheath thickness at P15 and P30, p = 0.47 at P15, p = 0.28 at P30. n = 3 mice, 189-247 sheaths/mouse. All p values comparing littermate control (Piezo1 fl/fl) and Piezo1 cKO mice using an unpaired t test with Welch correction. D) Myelin sheath thickness on small diameter axons (<2 um) at P15, p = 0.23, and P30, p = 0.49. n = 3 mice, 150-212 axons/mouse. E) Myelin sheath thickness on the large diameter axons (>2 um) at P15, p = 0.49, and P30, p = 0.47. n = 3 mice, 25-46 axons/mouse. F) Representative images of myelin outfoldings from P15 mice. Yellow arrowheads indicate myelin outfoldings. Scale bar = 1 um. G) Percent of myelin sheaths that contain outfoldings at P15, p = 0.40 and P30, p = 0.84. n = 3 mice, with 385-561 sheaths/mouse. Graph bars indicate mean and standard deviation. · Young, Galfano, Reyngoudt et al 2026, PLOS Biology · CC BY 4.0Myelin sheath onset and ultrastructure is not impacted by Piezo1 loss. A) Electron microscopy images of ventral cervical spinal cord of control (fl/fl) and Piezo1 cKO mice. Scale = 1 um. B) The percent of myelinated axons is unchanged at P5 (p = 0.40), P15 (p = 0.38), and P30 (p = 0.48). n = 3-4 mice, >300 axons/mouse. C) Average myelin sheath thickness at P15 and P30, p = 0.47 at P15, p = 0.28 at P30. n = 3 mice, 189-247 sheaths/mouse. All p values comparing littermate control (Piezo1 fl/fl) and Piezo1 cKO mice using an unpaired t test with Welch's correction. D) Myelin sheath thickness on small diameter axons (<2 um) at P15, p = 0.23, and P30, p = 0.49. n = 3 mice, 150-212 axons/mouse. E) Myelin sheath thickness on the large diameter axons (>2 um) at P15, p = 0.49, and P30, p = 0.47. n = 3 mice, 25-46 axons/mouse. F) Representative images of myelin outfoldings from P15 mice. Yellow arrowheads indicate myelin outfoldings. Scale bar = 1 um. G) Percent of myelin sheaths that contain outfoldings at P15, p = 0.40 and P30, p = 0.84. n = 3 mice, with 385-561 sheaths/mouse. Graph bars indicate mean and standard deviation. · Young, Galfano, Reyngoudt et al 2026, PLOS Biology · CC BY 4.0Myelin sheath onset and ultrastructure is not impacted by Piezo1 loss. A) Electron microscopy images of ventral cervical spinal cord of control (fl/fl) and Piezo1 cKO mice. Scale = 1 um. B) The percent of myelinated axons is unchanged at P5 (p = 0.40), P15 (p = 0.38), and P30 (p = 0.48). n = 3-4 mice, >300 axons/mouse. C) Average myelin sheath thickness at P15 and P30, p = 0.47 at P15, p = 0.28 at P30. n = 3 mice, 189-247 sheaths/mouse. D) Myelin sheath thickness on small diameter axons (<2 um) at P15, p = 0.23, and P30, p = 0.49. n = 3 mice, 150-212 axons/mouse. E) Myelin sheath thickness on the large diameter axons (>2 um) at P15, p = 0.49, and P30, p = 0.47. n = 3 mice, 25-46 axons/mouse. F) Representative images of myelin outfoldings from P15 mice. Yellow arrowheads indicate myelin outfoldings. Scale bar = 1 um. G) Percent of myelin sheaths that contain outfoldings at P15, p = 0.40 and P30, p = 0.84. n = 3 mice, with 385-561 sheaths/mouse. · Young, Galfano, Reyngoudt et al 2026, PLOS Biology · CC BY 4.0Pbx3 Deletion Delays Myelin Gene Expression. (a) Representative immunofluorescence images of MBP staining in Ctrl and Pbx3 cKO mice at indicated ages. Scale bar: 100 um. (b) Quantification of MBP immunofluorescence intensity in cc and CTX of Ctrl and Pbx3 cKO mice at P14, P27, and P50. Statistical analyses are limited to pairwise comparisons between control and cKO mice within each matched age; no statistical tests or direct quantitative comparisons are performed across different developmental ages. Data are presented as mean +/- SEM. n = 3 mice per group. * p < 0.05, ** p < 0.01; **** p < 0.0001, Unpaired Student t-test. · Yang, Ling, Zhang et al 2026, Journal of Developmental Biology · CC BY 4.0Myelin sheath onset and ultrastructure is not impacted by Piezo1 loss. A) Electron microscopy images of ventral cervical spinal cord of control (fl/fl) and Piezo1 cKO mice. Scale = 1 um. B) The percent of myelinated axons is unchanged at P5 (p = 0.40), P15 (p = 0.38), and P30 (p = 0.48). n = 3-4 mice, >300 axons/mouse. C) Average myelin sheath thickness at P15 and P30, p = 0.47 at P15, p = 0.28 at P30. n = 3 mice, 189-247 sheaths/mouse. All p values comparing littermate control (Piezo1 fl/fl) and Piezo1 cKO mice using an unpaired t test with Welch's correction. D) Myelin sheath thickness on small diameter axons (<2 um) at P15, p = 0.23, and P30, p = 0.49. n = 3 mice, 150-212 axons/mouse. E) Myelin sheath thickness on the large diameter axons (>2 um) at P15, p = 0.49, and P30, p = 0.47. n = 3 mice, 25-46 axons/mouse. F) Representative images of myelin outfoldings from P15 mice. Yellow arrowheads indicate myelin outfoldings. Scale bar = 1 um. G) Percent of myelin sheaths that contain outfoldings at P15, p = 0.40 and P30, p = 0.84. n = 3 mice, with 385-561 sheaths/mouse. Graph bars indicate mean and standard deviation. · Young, Galfano, Reyngoudt et al 2026, PLOS Biology · CC BY 4.0Myelin sheath onset and ultrastructure is not impacted by Piezo1 loss. A) Electron microscopy images of ventral cervical spinal cord of control (fl/fl) and Piezo1 cKO mice. Scale = 1 um. B) The percent of myelinated axons is unchanged at P5 (p = 0.40), P15 (p = 0.38), and P30 (p = 0.48). n = 3-4 mice, >300 axons/mouse. C) Average myelin sheath thickness at P15 and P30, p = 0.47 at P15, p = 0.28 at P30. n = 3 mice, 189-247 sheaths/mouse. D) Myelin sheath thickness on small diameter axons (<2 um) at P15, p = 0.23, and P30, p = 0.49. n = 3 mice, 150-212 axons/mouse. E) Myelin sheath thickness on the large diameter axons (>2 um) at P15, p = 0.49, and P30, p = 0.47. n = 3 mice, 25-46 axons/mouse. F) Representative images of myelin outfoldings from P15 mice. Yellow arrowheads indicate myelin outfoldings. Scale bar = 1 um. G) Percent of myelin sheaths that contain outfoldings at P15, p = 0.40 and P30, p = 0.84. n = 3 mice, with 385-561 sheaths/mouse. · Young, Galfano, Reyngoudt et al 2026, PLOS Biology · CC BY 4.0OPC differentiation and maturation are impaired in Rxrg-/- cultures through a Shh-dependent mechanism. (A, B) Graphs show the percentage of OPCs (A, NG2-positive cells) and mature oligodendrocytes (B, MBP-positive cells) in WT and Rxrg-/- cultures at 6 DIVs after exposure to T3 or vehicle. (C) Representative pictures of OPCs (NG2-positive cells) and mature oligodendrocytes (MBP-positive cells) in WT and Rxrg-/- cultures. (D) Percentage of MBP-positive cells in WT and Rxrg-/- cultures treated with cyclopamine or vehicle, alone or in combination with T3. Scale bar 100 um. (E, F) Expression of Mbp at mRNA (E) and protein (F) level in WT cultures treated with cyclopamine or SAG compared to untreated cells. · Baldassarro, Brassart, Fraulob et al 2026, Glia · CC BY 4.0The majority of myelin whorls are located within oligodendrocyte cytosol and are associated with myelinated axons, as revealed by SBEM. ( A ) Workflow for SBEM imaging and analysis of P14 optic nerves, including tissue preparation, SBEM imaging (Z-step size: 35 nm), manual segmentation, and 3D reconstruction. Created in BioRender. ( B-C'') SBEM reconstruction of P14 Tfeb F/F (B-B'') and Olig2-Cre; Tfeb F/F optic nerves (C-C''). ( D and D' ) Representative SBEM sections along the z-axis of a detached whorl (D), and its reconstruction (D') in the Olig2-Cre; Tfeb F/F optic nerve. ( E and E' ) Representative SBEM sections along the z-axis of a whorl associated with a myelinated axon (E), and its reconstruction (E') in the Olig2-Cre; Tfeb F/F optic nerve. The myelin whorl is outlined in blue, while the myelinated axon is outlined in magenta. The dashed line outlines the myelin sheaths that surround the axon and myelin whorl. ( F ) Quantification of the proportion of total whorl volume to the total optic nerve volume imaged by SBEM in P14 Tfeb F/F (Cntl) and Olig2-Cre; Tfeb F/F (cKO) optic nerves. ( G ) Quantification of individual whorl size in P14 control and Tfeb cKO optic nerves. ( H ) Quantification of 'detached' (13.68% in control, 22.92% in Tfeb cKO) and 'attached' whorl percentage (86.32% in control, 77.08% in Tfeb cKO). ( I ) Schematics showing detached myelin whorls and myelin whorls associated with myelinated axons. (Scale bar, 10 um for B', B'', C' and C''; and 1 um in D, D', E, and E'). · Barbosa, Bhambri, Vasquez et al 2026, Proceedings of the National Academy of Sciences of the United States of America · CC BY 4.0The majority of myelin whorls are located within oligodendrocyte cytosol and are associated with myelinated axons, as revealed by SBEM. (A) Workflow for SBEM imaging and analysis of P14 optic nerves, including tissue preparation, SBEM imaging (Z-step size: 35 nm), manual segmentation, and 3D reconstruction. (B-C'') SBEM reconstruction of P14 TfebF/F (B-B'') and Olig2-Cre; TfebF/F optic nerves (C-C''). (B) and (C) show the SBEM volume sizes and whorl densities from TfebF/F and Olig2-Cre; TfebF/F optic nerves, respectively. The reconstructed myelin whorls can be visualized by maximum projections from the top view (B' and C') and side view (B'' and C'') in TfebF/F (B' and B'') and Olig2-Cre; TfebF/F optic nerves (C' and C''). (D and D') Representative SBEM sections along the z-axis of a detached whorl (D), and its reconstruction (D') in the Olig2-Cre; TfebF/F optic nerve. (E and E') Representative SBEM sections along the z-axis of a whorl associated with a myelinated axon (E), and its reconstruction (E') in the Olig2-Cre; TfebF/F optic nerve. The myelin whorl is outlined in blue, while the myelinated axon is outlined in yellow. Scale bar, 5 um (D and E). · Barbosa, Bhambri, Vasquez et al 2026, Proceedings of the National Academy of Sciences of the United States of America · CC BY 4.0Luxol fast blue and PLP staining of human MS white matter showing myelin blisters at the edge of a micro-diffusely abnormal white matter lesion, reflecting focal myelin disruption without overt demyelination. · Luchicchi A 2024, Annals of clinical and translational neurology · CC BY 4.0Luxol fast blue (LFB) and proteolipid protein (PLP) immunostaining of human white matter from an MS brain, showing micro-diffusely abnormal white matter (mDAWM) with focal myelin swellings characteristic of an early pre-demyelinating lesion. · Luchicchi A 2024, Annals of clinical and translational neurology · CC BY 4.0Immunohistochemistry for myelin basic protein (MBP) in human MS white matter showing variation in myelin density across lesion and perilesional zones, used to assess the degree of remyelination following treatment with sphingosine-1-phosphate receptor modulators. · Ricigliano VAG 2026, Frontiers in immunology · CC BY 4.0
Oligodendrocyte knowledge base
Maintained by Oligodendro. Cite or omit. No em dashes. Last foundation pass: 2026-09-09.Citation audit 2026-09-09: rows carrying a PMID were resolved through NCBI and their titles checked against the claim. Rows without a PMID are textbook or review attributions that have not yet been resolved to a PubMed record; treat those as thin until they are.
History of discovery
The cell was named for its shape before anyone knew what it did. Sixty years separated the name from the proof of function.
Ramon y Cajal first described cells in CNS white matter distinct from neurons and astrocytes, calling them "third element" cells.
Ramon y Cajal, Histologie du Systeme Nerveux, 1909
Pio del Rio-Hortega used a silver carbonate method in 1921 to distinguish two populations of non-neuronal CNS cells: microglia and oligodendroglia. He named oligodendrocytes for their few (oligo) branching processes (dendro).
Rio-Hortega, Mem Real Soc Esp Hist Nat, 1921
The myelin sheath had been described by Virchow in 1854 as a lipid-rich insulating material, but its cellular origin in the CNS was not confirmed until electron microscopy in the 1960s linked oligodendrocyte processes to compact myelin lamellae.
Peters A. The formation and structure of myelin sheaths in the central nervous system. J Biophys Biochem Cytol. 1960;8:431-46. PMID: 13734758. (https://pubmed.ncbi.nlm.nih.gov/13734758/)
The discovery that one oligodendrocyte myelinates multiple axons (unlike the one-to-one Schwann cell relationship in the PNS) was established by EM serial reconstruction.
Bunge MB, Bunge RP, Ris H. Ultrastructural study of remyelination in an experimental lesion in adult cat spinal cord. J Biophys Biochem Cytol. 1961;10:67-94. PMID: 13688845. (https://pubmed.ncbi.nlm.nih.gov/13688845/)
Function
Insulation is the famous job and not the only one. The cell also feeds the axon it wraps, and that second role is separable from the first.
Myelination increases axonal conduction velocity up to 100-fold by enabling saltatory conduction and reduces the metabolic cost of action potential propagation.
Hartline DK, Colman DR. Rapid conduction and the evolution of giant axons and myelinated fibers. Curr Biol. 2007;17:R29-35. PMID: 17208176. (https://pubmed.ncbi.nlm.nih.gov/17208176/)
Myelin compaction reduces membrane capacitance and prevents ion leak between nodes, which together account for the velocity and efficiency gains of saltatory conduction.
Hartline DK, Colman DR. Rapid conduction and the evolution of giant axons and myelinated fibers. Curr Biol. 2007;17:R29-35. PMID: 17208176. (https://pubmed.ncbi.nlm.nih.gov/17208176/)
Oligodendrocytes provide metabolic support to axons by delivering lactate and pyruvate via monocarboxylate transporters (MCT1 in oligodendrocytes, MCT2 in axons), independent of myelination. Loss of this support causes axon degeneration even when myelin appears intact.
Fünfschilling U, Supplie LM, Mahad D, Boretius S, Saab AS, Edgar J, et al. Glycolytic oligodendrocytes maintain myelin and long-term axonal integrity. Nature. 2012;485:517-21. PMID: 22622581. (https://pubmed.ncbi.nlm.nih.gov/22622581/)
Structure: soma and processes
One cell body, many arms, each arm ending in a separate sheath on a separate axon. That reach is what distinguishes it from its peripheral counterpart.
A single mature CNS oligodendrocyte extends processes to myelinate up to ~50 distinct axon internodes; one Schwann cell wraps exactly one internode.
Nave KA, Werner HB. Myelination of the nervous system: mechanisms and functions. Annu Rev Cell Dev Biol. 2014;30:503-33. PMID: 25288117. (https://pubmed.ncbi.nlm.nih.gov/25288117/)
On H&E, mature oligodendrocytes show a round, dark nucleus surrounded by a clear perinuclear halo, a formalin fixation artifact from cytoplasmic retraction. The halo disappears in frozen or glutaraldehyde-fixed tissue.
Bancroft & Gamble, Theory and Practice of Histological Techniques, 6th ed.
Schmidt-Lanterman incisures are cytoplasm-filled clefts in compact myelin that provide a conduit for metabolite exchange between the oligodendrocyte soma and the inner tongue.
Ghabriel & Allt, Brain Research, 1981
Structure: the sheath
Compact myelin is mostly lipid, held together by two proteins, and interrupted at regular intervals so the impulse can be regenerated.
Myelin is a multilamellar lipid-rich membrane (70% lipid, 30% protein by dry weight) compacted by myelin basic protein (MBP) and proteolipid protein (PLP), which together account for ~80% of myelin protein.
Baumann N, Pham-Dinh D. Biology of oligodendrocyte and myelin in the mammalian central nervous system. Physiol Rev. 2001;81:871-927. PMID: 11274346. (https://pubmed.ncbi.nlm.nih.gov/11274346/)
The internode is the myelin-covered axon segment between two nodes of Ranvier. Internode length scales with axon diameter; larger axons have longer internodes.
Waxman & Bennett, Nature New Biology, 1972
Nodes of Ranvier are bare axon segments (~1 micron) flanked by paranodes and juxtaparanodes; voltage-gated Nav1.6 channels cluster at the node to enable saltatory conduction.
Precursors arrive in waves from the ventricular zone and are identified by a marker pair that is lost the moment they mature.
Oligodendrocyte precursor cells (OPCs, also called O-2A progenitors) arise in three successive waves from the ventral and then dorsal ventricular zone progenitors during embryogenesis.
Richardson et al., Nature Reviews Neuroscience, 2006
OPCs are identified by co-expression of NG2 (CSPG4) and PDGFRalpha; both markers are downregulated upon differentiation to mature oligodendrocytes.
Nishiyama A, Lin XH, Giese N, Heldin CH, Stallcup WB. Co-localization of NG2 proteoglycan and PDGF alpha-receptor on O2A progenitor cells in the developing rat brain. J Neurosci Res. 1996;43:299-314. PMID: 8714519. (https://pubmed.ncbi.nlm.nih.gov/8714519/)
The transcription factors Olig1 and Olig2 are expressed throughout the oligodendrocyte lineage from OPC to mature cell; Olig2 is the standard IHC marker for the full lineage.
Lu QR, Yuk D, Alberta JA, Zhu Z, Pawlitzky I, Chan J, et al. Sonic hedgehog--regulated oligodendrocyte lineage genes encoding bHLH proteins in the mammalian central nervous system. Neuron. 2000;25:317-29. PMID: 10719888. (https://pubmed.ncbi.nlm.nih.gov/10719888/)
Development: what drives differentiation
Maturation is held back as much as it is pushed forward, and precursors persist into adult life rather than being spent during development.
OPC differentiation to myelinating oligodendrocyte is promoted by PDGF-A, FGF2, and thyroid hormone, and inhibited by Notch signalling and PSA-NCAM on axons.
Barres & Raff, Journal of Cell Biology, 1994
OPCs persist throughout adult white and grey matter as the principal source of remyelination after injury, retaining differentiation capacity across the lifespan.
Zhu X, Hill RA, Dietrich D, Komitova M, Suzuki R, Nishiyama A. Age-dependent fate and lineage restriction of single NG2 cells. Development. 2011;138:745-53. PMID: 21266410. (https://pubmed.ncbi.nlm.nih.gov/21266410/)
The transcriptional repressor YY1 and chromatin remodelling by histone deacetylases are required for OPC-to-oligodendrocyte transition; HDAC inhibition blocks differentiation.
He et al., Nature Neuroscience, 2007
Myelination biology
The axon, not the oligodendrocyte, decides whether it is wrapped and how thickly. Wrapping then proceeds from the inside out.
Axonal signals govern whether an OPC myelinates a given axon; minimum axon diameter for CNS myelination is ~0.2 microns. Below this threshold, axons remain unmyelinated.
Voyvodic, Journal of Neuroscience, 1989
Neuregulin-1 (NRG1) on the axon surface signals via ErbB receptors on OPCs to regulate the onset and extent of myelination.
Taveggia C, Zanazzi G, Petrylak A, Yano H, Rosenbluth J, Einheber S, et al. Neuregulin-1 type III determines the ensheathment fate of axons. Neuron. 2005;47:681-94. PMID: 16129398. (https://pubmed.ncbi.nlm.nih.gov/16129398/)
Electrical activity in axons promotes myelination; activity-dependent adenosine release stimulates OPC differentiation via adenosine receptors.
Demerens C, Stankoff B, Logak M, Anglade P, Allinquant B, Couraud F, et al. Induction of myelination in the central nervous system by electrical activity. Proc Natl Acad Sci U S A. 1996;93:9887-92. PMID: 8790426. (https://pubmed.ncbi.nlm.nih.gov/8790426/)
Myelin assembly begins at the inner tongue, which spirals around the axon; compaction proceeds outward as MBP displaces cytoplasm from the growing sheath layers.
Snaidero N, Möbius W, Czopka T, Hekking LH, Mathisen C, Verkleij D, et al. Myelin membrane wrapping of CNS axons by PI(3,4,5)P3-dependent polarized growth at the inner tongue. Cell. 2014;156:277-90. PMID: 24439382. (https://pubmed.ncbi.nlm.nih.gov/24439382/)
Pathology: multiple sclerosis
The disease that made this cell clinically important. Myelin is the target; the axon is what is ultimately lost.
In multiple sclerosis, autoimmune T-cell and antibody-mediated attack targets myelin and oligodendrocytes, producing plaques with LFB pallor and relative early axon preservation.
MS plaques are classified histologically as active (macrophages with myelin debris), chronic active (active rim, inactive centre), and inactive (gliotic scar, no macrophages).
Lassmann et al., Lancet Neurology, 2012
Shadow plaques are areas of incomplete or thin remyelination visible as pale LFB staining adjacent to a fully demyelinated plaque; they indicate endogenous repair.
Prineas & Connell, Annals of Neurology, 1979
Axonal injury in MS occurs from the earliest stages and is the main substrate of permanent disability; it can occur in demyelinated and in myelinated axons.
Trapp BD, Peterson J, Ransohoff RM, Rudick R, Mörk S, Bö L. Axonal transection in the lesions of multiple sclerosis. N Engl J Med. 1998;338:278-85. PMID: 9445407. (https://pubmed.ncbi.nlm.nih.gov/9445407/)
Pathology: genetic and infectious white matter disease
Myelin also fails without autoimmunity: by inherited defect in its synthesis, by attack on the neighbouring astrocyte, and by a virus that infects the oligodendrocyte directly.
Leukodystrophies are genetic disorders of myelin synthesis or maintenance; most involve mutations in oligodendrocyte-expressed genes (PLP1 in PMD, GALC in Krabbe, ARSA in MLD).
Vanderver et al., Journal of Child Neurology, 2015
Neuromyelitis optica spectrum disorder (NMOSD) is associated with aquaporin-4 antibodies targeting astrocytes, but causes severe oligodendrocyte and myelin loss secondarily in spinal cord and optic nerves.
Pittock & Lucchinetti, Annals of Neurology, 2016
Progressive multifocal leukoencephalopathy (PML) is caused by JC virus replication in oligodendrocytes, producing widespread CNS demyelination in immunocompromised patients.
Berger, Annals of Neurology, 2011
Disease models
Three preparations, each isolating a different mechanism. Choosing the wrong one is the commonest way to misread a remyelination result.
Cuprizone (dietary copper chelator) selectively kills mature oligodendrocytes in mice, producing reproducible corpus callosum demyelination and the dominant preclinical platform for remyelination kinetics. It does not replicate the immune-mediated lesion of MS.
Matsushima GK, Morell P. The neurotoxicant, cuprizone, as a model to study demyelination and remyelination in the central nervous system. Brain Pathol. 2001;11:107-16. PMID: 11145196. (https://pubmed.ncbi.nlm.nih.gov/11145196/)
EAE (experimental autoimmune encephalomyelitis) is induced by immunisation with myelin peptides (MOG35-55, MBP, PLP) and models immune-mediated demyelination; cuprizone models toxic-metabolic demyelination without significant T-cell infiltration.
Ransohoff, Nature Reviews Immunology, 2012
Lysolecithin (lysophosphatidylcholine) focal injection produces rapid, well-demarcated demyelinating lesions and spontaneous remyelination within weeks; useful for studying local repair mechanisms.
Jeffery & Blakemore, Journal of Neurocytology, 1995
Remyelination
The CNS can rebuild myelin, and the repair is recognisable because it is thinner than the original. Where repair fails, the precursors are usually present but stalled.
Remyelination in the adult CNS is mediated primarily by surviving OPCs that are recruited to lesions, proliferate, and redifferentiate.
Franklin RJ, Ffrench-Constant C. Remyelination in the CNS: from biology to therapy. Nat Rev Neurosci. 2008;9:839-55. PMID: 18931697. (https://pubmed.ncbi.nlm.nih.gov/18931697/)
Remyelinated axons show thinner sheaths relative to axon diameter (elevated g-ratio compared to original myelin), a quantifiable marker of repair rather than regeneration.
Franklin RJ, Ffrench-Constant C. Remyelination in the CNS: from biology to therapy. Nat Rev Neurosci. 2008;9:839-55. PMID: 18931697. (https://pubmed.ncbi.nlm.nih.gov/18931697/)
Remyelination restores saltatory conduction and provides trophic support to axons, preventing secondary axon degeneration in chronically demyelinated lesions.
Irvine & Bhatt, Journal of Neurology, 2006
Remyelination failure in progressive MS is associated with OPC differentiation arrest, not absence of OPCs; OPCs are present in chronic lesions but do not mature.
Wolswijk G. Chronic stage multiple sclerosis lesions contain a relatively quiescent population of oligodendrocyte precursor cells. J Neurosci. 1998;18:601-9. PMID: 9425002. (https://pubmed.ncbi.nlm.nih.gov/9425002/)
Retinoid X receptor gamma (RXRgamma) agonists and antimuscarinics (clemastine, benztropine) promote OPC differentiation and remyelination in rodent models.
Huang JK, Jarjour AA, Nait Oumesmar B, Kerninon C, Williams A, Krezel W, et al. Retinoid X receptor gamma signaling accelerates CNS remyelination. Nat Neurosci. 2011;14:45-53. PMID: 21131950. (https://pubmed.ncbi.nlm.nih.gov/21131950/); Deshmukh VA, Tardif V, Lyssiotis CA, Green CC, Kerman B, Kim HJ, et al. A regenerative approach to the treatment of multiple sclerosis. Nature. 2013;502:327-332. PMID: 24107995. (https://pubmed.ncbi.nlm.nih.gov/24107995/)
Methods: myelin stains
Myelin is stained for its lipid. Every white matter workup starts with one of these and lives or dies on the differentiation step.
Luxol fast blue (LFB) stains intact myelin phospholipids blue; pallor indicates demyelination and is the histological anchor for every white-matter differential diagnosis. Differentiation in lithium carbonate is critical: under-differentiation leaves artefactual background blue; over-differentiation washes out true myelin signal.
Bancroft & Gamble, Theory and Practice of Histological Techniques, 6th ed.
Kluver-Barrera combines LFB with cresyl violet: myelin stains blue, Nissl substance (neuronal rough ER) stains purple. Standard for evaluating both myelin integrity and neuronal architecture on a single section.
KLUVER H, BARRERA E. A method for the combined staining of cells and fibers in the nervous system. J Neuropathol Exp Neurol. 1953;12:400-3. PMID: 13097193. (https://pubmed.ncbi.nlm.nih.gov/13097193/)
Paired LFB and Bielschowsky silver staining distinguishes primary demyelination (myelin lost, axons preserved on Bielschowsky) from axonal loss (both myelin and axon cylinders absent).
Weller, Brain Pathology, 1998
Methods: immunohistochemistry and electron microscopy
Antibodies find the protein before the lipid stain notices anything is wrong. Electron microscopy remains the arbiter of sheath thickness.
MBP immunohistochemistry is more sensitive than LFB for early or patchy demyelination and confirms myelin sheath integrity at the protein level. Loss of MBP signal precedes visible LFB pallor in early lesions.
Lassmann, Brain Pathology, 1998
MOG (myelin oligodendrocyte glycoprotein) and CNPase IHC mark the outer myelin membrane and oligodendrocyte cytoplasm respectively; useful for identifying remyelinating sheaths (thin MOG+ rings) and mature oligodendrocyte cell bodies (CNPase+).
Brunner et al., Journal of Neurochemistry, 1989
Electron microscopy remains the gold standard for measuring g-ratio and confirming myelin compaction, but confocal quantification of fluorescence ratios (MBP/NF200) provides a practical research alternative.
Franklin RJ, Ffrench-Constant C. Remyelination in the CNS: from biology to therapy. Nat Rev Neurosci. 2008;9:839-55. PMID: 18931697. (https://pubmed.ncbi.nlm.nih.gov/18931697/)
Classic papers: the foundations
Four papers that established what the cell is, what it makes, and how to see it.
Paper Rio-Hortega 1921: naming and first description of oligodendroglia ·Why it matters Founding taxonomy
Del Rio-Hortega P. Studies on neuroglia: Glia with very few processes (oligodendroglia) by PÃ-o del RÃ-o-Hortega. 1921. Clin Neuropathol. 2012;31:440-59. PMID: 23083463. (https://pubmed.ncbi.nlm.nih.gov/23083463/)
Paper Kluver & Barrera 1953: the combined stain for cells and fibres, still used on demyelination workups ·Why it matters Methods gold standard
Four that changed what the cell is understood to do, and what its failure costs the axon.
Paper Barres, Raff et al. 1994: control of oligodendrocyte number, and the hormonal timing of their development ·Why it matters Developmental framework
Neuron (Barres BA, Lazar MA, Raff MC. A novel role for thyroid hormone, glucocorticoids and retinoic acid in timing oligodendrocyte development. Development. 1994;120:1097-108. PMID: 8026323. (https://pubmed.ncbi.nlm.nih.gov/8026323/)
Paper Trapp et al. 1998: axonal transection in active MS lesions ·Why it matters Pathology paradigm shift
The last decade reframed the cell twice: as a family of transcriptional states rather than one type, and as a repair target that drugs can reach.
Single-cell RNA sequencing resolves the mouse oligodendrocyte lineage into distinct transcriptional states, with mature subtypes enriched in particular brain regions.
Marques S, Zeisel A, Codeluppi S, van Bruggen D, Mendanha Falcão A, Xiao L, et al. Oligodendrocyte heterogeneity in the mouse juvenile and adult central nervous system. Science. 2016;352:1326-1329. PMID: 27284195. (https://pubmed.ncbi.nlm.nih.gov/27284195/)
Clemastine shortened visual evoked potential latency in chronic optic neuropathy in a crossover trial, the first remyelination signal from a drug in humans.
Green AJ, Gelfand JM, Cree BA, Bevan C, Boscardin WJ, Mei F, et al. Clemastine fumarate as a remyelinating therapy for multiple sclerosis (ReBUILD): a randomised, controlled, double-blind, crossover trial. Lancet. 2017;390:2481-2489. PMID: 29029896. (https://pubmed.ncbi.nlm.nih.gov/29029896/)
Metformin restores the responsiveness of aged OPCs to differentiation signals, making age-related remyelination failure at least partly reversible in rodents.
Bazedoxifene and related SERMs promote OPC differentiation and remyelination through a mechanism that does not require the estrogen receptor.
Rankin KA, Mei F, Kim K, Shen YA, Mayoral SR, Desponts C, et al. Selective Estrogen Receptor Modulators Enhance CNS Remyelination Independent of Estrogen Receptors. J Neurosci. 2019;39:2184-2194. PMID: 30696729. (https://pubmed.ncbi.nlm.nih.gov/30696729/)
Oligodendrocyte lineage cells carry regional identity of their own: in culture, brainstem OPCs proliferate more slowly and differentiate later than forebrain OPCs, in mice.
Andrews JM, Budd KM, Kwon CH, Larson JD, Shirinifard A, Kasper LH, et al. Cell autonomous regional differences in oligodendrocyte lineage development and responses to oncohistone H3.3 K27M. Nat Commun. 2026. PMID: 42649219. (https://pubmed.ncbi.nlm.nih.gov/42649219/)
In multiple system atrophy, oligodendrocytes carry extra somatic copies of SNCA, and a cell with a gain is twice as likely to hold an alpha-synuclein inclusion. Human post-mortem tissue.
Morley C, Kalef-Ezra E, Perez-Rodriguez D, Jaunmuktane Z, Proukakis C. Oligodendroglial somatic SNCA copy number gains are associated with inclusions and disease onset in multiple system atrophy. Acta Neuropathol. 2026. PMID: 42696165. (https://pubmed.ncbi.nlm.nih.gov/42696165/)
Remyelination can fail with precursors present and willing: fibronectin accumulating in lesions sequesters OPCs, and inhibiting it restored repair in a nonremitting mouse EAE model.
Nanou A, Apostolou-Karampelis K, Triantafyllidou V, Sakkou M, Roumelioti F, Denis MC, et al. Fibronectin inhibition restores myelination in endothelial TNFR2-dependent nonremitting experimental autoimmune encephalomyelitis. Proc Natl Acad Sci U S A. 2026;123:e2616799123. PMID: 42709811. (https://pubmed.ncbi.nlm.nih.gov/42709811/)
Organ and tissue context
Oligodendrocytes live in every CNS white matter tract and in grey matter, but density, g-ratio, and internode geometry differ by location. The corpus callosum, optic nerve, and spinal cord are the most studied homes.
Tract or region Corpus callosum ·Fact The g-ratio (inner / outer axon diameter) measured by transmission electron microscopy shows a distribution of values across the callosum rather than a single fixed number; aggregate g-ratio and axon caliber distributions were quantified in detail in the cynomolgus macaque. ·Species macaque
Stikov N, Campbell JS, Stroh T, Lavelée M, Frey S, Novek J, et al. Quantitative analysis of the myelin g-ratio from electron microscopy images of the macaque corpus callosum. Data Brief. 2015;4:368-73. PMID: 26217818. (https://pubmed.ncbi.nlm.nih.gov/26217818/)
Tract or region Corpus callosum ·Fact A combined magnetization transfer and diffusion MRI method maps the g-ratio in vivo across the whole brain, validated against histology in macaque and applied to one healthy human and one MS patient; the method derives g-ratio from myelin volume fraction and axon volume fraction. ·Species macaque, human
Stikov N, Campbell JS, Stroh T, Lavelée M, Frey S, Novek J, et al. In vivo histology of the myelin g-ratio with magnetic resonance imaging. Neuroimage. 2015;118:397-405. PMID: 26004502. (https://pubmed.ncbi.nlm.nih.gov/26004502/)
Tract or region Corpus callosum ·Fact In capuchin monkeys (Sapajus apella), myelin characteristics of the corpus callosum were measured across the lifespan by EM, providing normative morphometric data on sheath thickness and g-ratio across developmental and aging stages. ·Species capuchin monkey
Watson CM, Sherwood CC, Phillips KA. Myelin characteristics of the corpus callosum in capuchin monkeys (Sapajus [Cebus] apella) across the lifespan. Sci Rep. 2022;12:8786. PMID: 35610294. (https://pubmed.ncbi.nlm.nih.gov/35610294/)
Tract or region Corpus callosum ·Fact The first monoclonal antibody to CNP was generated from spleen cells immunized with delipidated white matter from rat corpus callosum; it labels oligodendrocytes specifically and not astrocytes, neurons, Schwann cells or fibroblasts, establishing the corpus callosum as the standard source for myelin antigen preparation. ·Species rat
Brenner T, Lisak RP, Rostami A, McMorris FA, Silberberg DH. A monoclonal antibody raised to corpus callosum extract reacts with 2',3'-cyclic nucleotide 3'-phosphohydrolase. J Neurochem. 1986;46:54-60. PMID: 2999339. (https://pubmed.ncbi.nlm.nih.gov/2999339/)
Tract or region Gray and white matter, brain-wide ·Fact OPC density was measured across CNS regions in developing and adult mice; NMDA-receptor-null OPCs achieved normal density in both gray and white matter and differentiated to produce all major white matter tracts without delay, confirming that regional OPC homeostasis is maintained cell-autonomously in the absence of NMDA signalling. ·Species mouse
De Biase LM, Kang SH, Baxi EG, Fukaya M, Pucak ML, Mishina M, et al. NMDA receptor signaling in oligodendrocyte progenitors is not required for oligodendrogenesis and myelination. J Neurosci. 2011;31:12650-62. PMID: 21880926. (https://pubmed.ncbi.nlm.nih.gov/21880926/)
Tract or region Brain-wide (atlas) ·Fact Brain-wide mapping of oligodendrocyte organisation, oligodendrogenesis, and myelin injury in the mouse identified regional variation in OPC density and oligodendrocyte turnover rates, producing the first whole-brain atlas of the oligodendrocyte lineage. ·Species mouse
Xu YKT, Bush A, Musheyev E, Umans J, Zhang L, Kim AA, et al. Brain-wide mapping of oligodendrocyte organization, oligodendrogenesis, and myelin injury. Cell. 2026;189:1535-1554.e22. PMID: 41713416. (https://pubmed.ncbi.nlm.nih.gov/41713416/)
Tract or region Hippocampus ·Fact Vesicle-filled axon terminals were identified by EM making synaptic junctions with OPC processes in both the young and adult hippocampus, establishing the hippocampus as the site where the first neuron-to-OPC synapses were demonstrated. ·Species rat
Bergles DE, Roberts JD, Somogyi P, Jahr CE. Glutamatergic synapses on oligodendrocyte precursor cells in the hippocampus. Nature. 2000;405:187-91. PMID: 10821275. (https://pubmed.ncbi.nlm.nih.gov/10821275/)
Molecular markers and signalling
Molecule MBP (myelin basic protein) ·Role The second most abundant CNS myelin protein; responsible for adhesion of the cytosolic surfaces of multilayered compact myelin; a member of the intrinsically disordered protein family that interacts with actin, tubulin, calmodulin and negatively charged lipids; some isoforms are transported to the nucleus. ·Species CNS general
Molecule PLP and DM20 (proteolipid proteins) ·Role PLP and DM20 are essential for CNS myelin compaction and for oligodendrocyte maturation; both isoforms are required, as shown by rescue experiments in jimpy and rumpshaker Plp-mutant mice; DM20 assists PLP translocation into the myelin membrane. ·Species mouse
Nadon NL, West M. Myelin proteolipid protein: function in myelin structure is distinct from its role in oligodendrocyte development. Dev Neurosci. 1998;20:533-9. PMID: 9858842. (https://pubmed.ncbi.nlm.nih.gov/9858842/)
Molecule MOG (myelin oligodendrocyte glycoprotein) ·Role A surface-exposed myelin glycoprotein that serves as the target antigen in MOGAD (myelin oligodendrocyte glycoprotein antibody-associated disease), a spectrum of inflammatory demyelinating CNS disorders distinct from MS; anti-MOG IgG binds the extracellular Ig-like domain. ·Species human
Di Pauli F, Berger T. Myelin Oligodendrocyte Glycoprotein Antibody-Associated Disorders: Toward a New Spectrum of Inflammatory Demyelinating CNS Disorders?. Front Immunol. 2018;9:2753. PMID: 30555462. (https://pubmed.ncbi.nlm.nih.gov/30555462/)
Molecule CNP (2',3'-cyclic nucleotide 3'-phosphodiesterase) ·Role An early oligodendrocyte-specific intracellular enzyme appearing as two bands at 48 and 50 kDa in CNS myelin SDS-PAGE; not found in astrocytes, neurons, Schwann cells or fibroblasts; the corpus callosum is the standard source for CNP antigen preparation. ·Species rat
Brenner T, Lisak RP, Rostami A, McMorris FA, Silberberg DH. A monoclonal antibody raised to corpus callosum extract reacts with 2',3'-cyclic nucleotide 3'-phosphohydrolase. J Neurochem. 1986;46:54-60. PMID: 2999339. (https://pubmed.ncbi.nlm.nih.gov/2999339/)
Molecule NG2 (chondroitin sulfate proteoglycan 4) and PDGFRalpha ·Role OPCs are identified by co-expression of NG2 and PDGFRalpha; OPC proliferation depends on PDGF-AA signalling through PDGFRalpha; selective repression of Pdgfra transcription by guanidine compounds dramatically reduces OPC proliferation without affecting astrocytes. ·Species mouse, human
Medved J, Wood WM, van Heyst MD, Sherafat A, Song JY, Sakya S, et al. Novel guanidine compounds inhibit platelet-derived growth factor receptor alpha transcription and oligodendrocyte precursor cell proliferation. Glia. 2021;69:792-811. PMID: 33098183. (https://pubmed.ncbi.nlm.nih.gov/33098183/)
Molecule AMPA receptors (GluA subunits) on OPCs ·Role Glutamate released by pyramidal neuron axons activates AMPA receptors on OPC processes, generating inward currents with quantal kinetics; some receptors are calcium-permeable, linking axonal firing to calcium signalling in OPCs; demonstrated by EM-confirmed synaptic junctions in hippocampus. ·Species rat
Bergles DE, Roberts JD, Somogyi P, Jahr CE. Glutamatergic synapses on oligodendrocyte precursor cells in the hippocampus. Nature. 2000;405:187-91. PMID: 10821275. (https://pubmed.ncbi.nlm.nih.gov/10821275/)
Molecule NMDA receptors (NR1 subunit) on OPCs ·Role OPCs express NMDA receptors and form synapses with glutamatergic neurons throughout the CNS; conditional deletion of the obligatory NR1 subunit from OPCs showed that NMDAR signalling is not required for OPC proliferation, density, differentiation, or myelination, but regulates AMPAR-dependent signalling with axons. ·Species mouse
De Biase LM, Kang SH, Baxi EG, Fukaya M, Pucak ML, Mishina M, et al. NMDA receptor signaling in oligodendrocyte progenitors is not required for oligodendrogenesis and myelination. J Neurosci. 2011;31:12650-62. PMID: 21880926. (https://pubmed.ncbi.nlm.nih.gov/21880926/)
Molecule GABA-A receptors on OPCs ·Role Interneurons form GABAergic synapses onto OPCs in the hippocampus, identified by electrophysiology; OPCs therefore receive both excitatory and inhibitory synaptic inputs from neurons. ·Species rat
Lin SC, Bergles DE. Synaptic signaling between GABAergic interneurons and oligodendrocyte precursor cells in the hippocampus. Nat Neurosci. 2004;7:24-32. PMID: 14661022. (https://pubmed.ncbi.nlm.nih.gov/14661022/)
Molecule GluA2 (calcium-impermeable AMPA receptor subunit) on OPCs ·Role Overexpression of GluA2 in OPCs after injury shifts AMPA receptor composition toward calcium-impermeable forms and promotes post-injury OPC regeneration and oligodendrogenesis, indicating that AMPA receptor subunit identity shapes OPC recovery capacity. ·Species mouse, rat
Khawaja RR, Agarwal A, Fukaya M, Jeong HK, Gross S, Gonzalez-Fernandez E, et al. GluA2 overexpression in oligodendrocyte progenitors promotes postinjury oligodendrocyte regeneration. Cell Rep. 2021;35:109147. PMID: 34010640. (https://pubmed.ncbi.nlm.nih.gov/34010640/)
Mouse. Small axons left without compact myelin in Teneurin-4 knockouts still survive at a year; four 14-3-3 isoforms rise in them, and blocking 14-3-3 hastens their damage.
Comprehensive review of OPC roles beyond myelin repair: regulation of neuronal circuit activity, immune surveillance, vascular remodelling, and metabolic support
Neuroligin-3 binds NG2/CSPG4 on OPCs to activate integrin-mediated mechanotransduction, sustaining progenitor state; the same pathway is co-opted by glioma
Review of hydrogel, nanoparticle and scaffold systems for sustained delivery of remyelinating agents in spinal cord injury; discusses OPC recruitment strategies