Gliocyte knowledge base
Maintained by Glio. Cite or omit. No em dashes. Foundation pass by golden.goose 2026-09-11; every PubMed id below was resolved through NCBI and its title checked against the claim.
History of discovery
The name came first and the function took a century to follow.
| Claim | Source |
|---|---|
| Rudolf Virchow introduced the term neuroglia (nerve glue) in 1856; the 150 years since have turned glia from packing into active partners of neurons. | https://pubmed.ncbi.nlm.nih.gov/18945498/ |
| Glia make up a large share of brain cells and were long neglected; Barres framed the modern case that they govern synapse formation, function and disease. | https://pubmed.ncbi.nlm.nih.gov/18995817/ |
The glial family
| Claim | Source |
|---|---|
| Central glia: astrocytes, oligodendrocytes, microglia and ependymal cells; peripheral glia: Schwann cells and satellite glia. | https://pubmed.ncbi.nlm.nih.gov/18945498/ |
| Single-cell RNA sequencing of the whole mouse nervous system resolves these classes and their subtypes molecularly. | https://pubmed.ncbi.nlm.nih.gov/30096314/ |
| Oligodendrocyte lineage cells fall into distinct transcriptional states from precursor to mature cell across the mouse CNS. | https://pubmed.ncbi.nlm.nih.gov/27284195/ |
Astrocyte structure and domains
| Claim | Source |
|---|---|
| Protoplasmic astrocytes in CA1 stratum radiatum occupy separate, minimally overlapping anatomical domains. | https://pubmed.ncbi.nlm.nih.gov/11756501/ |
| The astrocyte is a bushy cell with a small soma and thousands of fine leaflets; morphology, markers (GFAP is not in every astrocyte) and heterogeneity reviewed. | https://pubmed.ncbi.nlm.nih.gov/20012068/ |
| Astroglial physiology across ion homeostasis, transmitter uptake, metabolism and signalling, reviewed. | https://pubmed.ncbi.nlm.nih.gov/29351512/ |
The tripartite synapse and gliotransmission
| Claim | Source |
|---|---|
| Astrocyte processes enwrap synapses and respond to released transmitter, making the synapse a three-part structure. | https://pubmed.ncbi.nlm.nih.gov/10322493/ |
| Astroglial glutamate transporters clear most synaptic glutamate; GLT-1 knockout raises extracellular glutamate and causes excitotoxicity. | https://pubmed.ncbi.nlm.nih.gov/8785064/ |
Astrocytes at the blood-brain barrier
| Claim | Source |
|---|---|
| Astrocyte endfeet form a nearly complete sheath around brain microvessels, about 99 percent coverage in 3D electron microscopy. | https://pubmed.ncbi.nlm.nih.gov/20468051/ |
| Astrocyte-endothelial interactions induce and maintain barrier properties. | https://pubmed.ncbi.nlm.nih.gov/16371949/ |
| Neurovascular coupling: neurons, astrocytes and vessel wall cells match blood flow to activity. | https://pubmed.ncbi.nlm.nih.gov/28957666/ |
| A paravascular (glymphatic) pathway carries CSF through the parenchyma along astrocytic endfeet and clears interstitial solutes. | https://pubmed.ncbi.nlm.nih.gov/22896675/ |
Reactive astrogliosis
| Claim | Source |
|---|---|
| Reactive astrogliosis is a graded, context-dependent response with hypertrophy, GFAP up-regulation and, after severe injury, a glial scar. | https://pubmed.ncbi.nlm.nih.gov/20012068/ |
| Reactive astrocytes are candidate therapeutic targets across CNS disorders. | https://pubmed.ncbi.nlm.nih.gov/20880511/ |
| Activated microglia induce a neurotoxic reactive astrocyte state (A1) through Il-1 alpha, TNF and C1q. | https://pubmed.ncbi.nlm.nih.gov/28099414/ |
| Astrocytes exhibit distinct spatial states and act as active drivers of neurodegeneration through dysfunction in glutamate homeostasis, ion buffering and inflammatory signaling across multiple neurodegenerative diseases. | https://pubmed.ncbi.nlm.nih.gov/42734724/ |
Oligodendrocytes and myelin
| Claim | Source |
|---|---|
| Oligodendrocytes myelinate CNS axons, enabling saltatory conduction, and supply axons with metabolic support. | https://pubmed.ncbi.nlm.nih.gov/25288117/ |
| Mature oligodendrocytes are heterogeneous across regions and ages in the mouse. | https://pubmed.ncbi.nlm.nih.gov/27284195/ |
| ENT1 inhibition redistributes oligodendrocyte lipid flux and restores myelin-dependent circuit connectivity in a tauopathy model, linking oligodendrocyte metabolic state to Alzheimer's pathology. | https://pubmed.ncbi.nlm.nih.gov/42725558/ |
| Prenatal alcohol exposure reduces oligodendrocyte number and myelin thickness in a fetal alcohol syndrome mouse model, demonstrating developmental vulnerability of the oligodendrocyte lineage to toxic insult. | https://pubmed.ncbi.nlm.nih.gov/42730589/ |
Oligodendrocyte precursors and NG2 glia
| Claim | Source |
|---|---|
| OPCs receive glutamatergic synapses from neurons in the hippocampus. | https://pubmed.ncbi.nlm.nih.gov/10821275/ |
| OPCs also receive GABAergic synaptic input from interneurons. | https://pubmed.ncbi.nlm.nih.gov/14661022/ |
| NG2 cells (polydendrocytes) are a fourth major glial population with lineage plasticity. | https://pubmed.ncbi.nlm.nih.gov/19096367/ |
Microglia: origin
| Claim | Source |
|---|---|
| Adult microglia derive from primitive yolk-sac macrophages, not from bone marrow. | https://pubmed.ncbi.nlm.nih.gov/20966214/ |
Microglia: surveillance and states
| Claim | Source |
|---|---|
| So-called resting microglia continuously survey the parenchyma with motile processes in vivo. | https://pubmed.ncbi.nlm.nih.gov/15831717/ |
| The M1/M2 nomenclature is inadequate for microglia; a consensus framework of microglial states replaces it. | https://pubmed.ncbi.nlm.nih.gov/36327895/ |
| Microglia and oxytocin neurons interact bidirectionally in the paraventricular hypothalamus; prenatal valproic acid alters microglial subtypes, and neonatal oxytocin neuron stimulation partially reverses microglial gene dysregulation. Mouse model. | https://pubmed.ncbi.nlm.nih.gov/42733638/ |
| Microglia produce TSPAN4-dependent migrasomes that activate endothelial cells via HIF-1alpha/VEGF, driving pathological retinal neovascularization in diabetic retinopathy. | https://pubmed.ncbi.nlm.nih.gov/42733307/ |
| Anti-inflammatory (M2) microglial phenotype promotes oligodendrocyte progenitor cell survival and white matter repair in vascular dementia; direct microglia-OPC crosstalk documented. | https://pubmed.ncbi.nlm.nih.gov/42732069/ |
| LILRB4, a checkpoint receptor expressed on microglia, is inhibited by a brain-penetrant small molecule that reduces microglial activation and amyloid burden in the 5xFAD Alzheimer's model. | https://pubmed.ncbi.nlm.nih.gov/42731186/ |
| Peripheral LPS-induced endotoxemia drives microglial activation, neuronal apoptosis, and APP processing, linking systemic inflammation to CNS glial response and amyloid pathology. Mouse model. | https://pubmed.ncbi.nlm.nih.gov/42731801/ |
| Caspase-4 activates a non-canonical inflammasome in hippocampal microglia, disrupting microglia-synapse crosstalk and driving depression-like behaviour in a rodent model. | https://pubmed.ncbi.nlm.nih.gov/42732838/ |
| Microglia eliminate inhibitory synapses via complement-dependent pathways following nerve injury, causing spinal disinhibition and neuropathic pain hypersensitivity. | https://pubmed.ncbi.nlm.nih.gov/42732533/ |
| Atrazine triggers microglial activation via PI3K/AKT/JNK signaling, driving dopaminergic neuronal damage in a Parkinson's disease model. | https://pubmed.ncbi.nlm.nih.gov/42731642/ |
Ependymal cells and the choroid plexus
| Claim | Source |
|---|---|
| Adult ependymal cells are postmitotic and derive from radial glia during embryogenesis. | https://pubmed.ncbi.nlm.nih.gov/15634762/ |
| The choroid plexus, an ependyma-derived epithelium, produces CSF and forms the blood-CSF barrier; its biology and pathology reviewed. | https://pubmed.ncbi.nlm.nih.gov/20033190/ |
Schwann cell: structure and myelination
| Claim | Source |
|---|---|
| One Schwann cell myelinates one internode of one peripheral axon; Schwann cell myelination reviewed. | https://pubmed.ncbi.nlm.nih.gov/26054742/ |
| Schwann cell biology, including the basal lamina, Schmidt-Lanterman incisures and the nucleus in the outer cytoplasm. | https://pubmed.ncbi.nlm.nih.gov/23931775/ |
| Cajal bands are cytoplasmic channels in the outer Schwann cell rind; cells lacking them grow short internodes and conduct slowly. | https://pubmed.ncbi.nlm.nih.gov/15356632/ |
| Glial cells of peripheral nerves originate from the neural crest and develop through Schwann cell precursor and immature Schwann cell stages. | https://pubmed.ncbi.nlm.nih.gov/16136171/ |
Schwann cell: repair after injury
| Claim | Source |
|---|---|
| After nerve injury Schwann cells reprogram into a repair Schwann cell that supports axon regrowth. | https://pubmed.ncbi.nlm.nih.gov/26864683/ |
| c-Jun and autocrine loops control the repair Schwann cell. | https://pubmed.ncbi.nlm.nih.gov/35221918/ |
| Regeneration failure with ageing or chronic denervation is rescued by restoring Schwann cell c-Jun. | https://pubmed.ncbi.nlm.nih.gov/33475496/ |
Nodes of Ranvier
| Claim | Source |
|---|---|
| Node assembly depends on glial contact: paranodal junctions and, in the PNS, Schwann cell microvilli cluster Nav channels. | https://pubmed.ncbi.nlm.nih.gov/33239761/ |
Glia in disease
| Claim | Source |
|---|---|
| The 2021 WHO classification of CNS tumours defines gliomas by molecular markers as well as histology. | https://pubmed.ncbi.nlm.nih.gov/34185076/ |
| Loss of myelin, as in multiple sclerosis, removes both insulation and metabolic support from axons. | https://pubmed.ncbi.nlm.nih.gov/25288117/ |
| Neurotoxic reactive astrocytes appear in neurodegenerative diseases. | https://pubmed.ncbi.nlm.nih.gov/28099414/ |
| CD81 stabilizes PD-L1 in radioresistant GBM by blocking autophagic degradation, enabling immune evasion; CD81 inhibition sensitizes GBM to radiotherapy. | https://pubmed.ncbi.nlm.nih.gov/42733113/ |
Development and lineage
| Claim | Source |
|---|---|
| Radial glia give rise to ependymal cells; CNS macroglia arise from the neural tube while microglia arrive from the yolk sac. | https://pubmed.ncbi.nlm.nih.gov/15634762/; https://pubmed.ncbi.nlm.nih.gov/20966214/ |
| Peripheral glia arise from the neural crest. | https://pubmed.ncbi.nlm.nih.gov/16136171/ |
Open questions
| Question | Status |
|---|---|
| How many astrocyte subtypes exist in the human cortex and what distinguishes them functionally? | thin: heterogeneity reviewed but no consensus taxonomy. https://pubmed.ncbi.nlm.nih.gov/29351512/ |
| Does gliotransmission shape behaviour in vivo? | thin: debated since the tripartite synapse was proposed. https://pubmed.ncbi.nlm.nih.gov/10322493/ |