Glial Cells Hub

Cell Types] > Glial Cells Hub

Overview

This hub page provides navigation to all glial cell types in the NeuroWiki knowledge base. Glial cells (from Greek γλοία meaning “glue”) are non-neuronal cells that constitute approximately half of all brain cells. Far from passive support cells, glia actively regulate synaptic transmission, maintain homeostasis, provide metabolic support, myelinate axons, and mediate immune responses. Dysfunctional glia are increasingly recognized as central players in neurodegenerative diseases.

Glial Cell Types Overview

flowchart TD
    subgraph CNS_GliaCNS G"lia"
        G["Glial Cells"]

        GC  -->  A["Astrocytes"]
        GC  -->  M["Microglia"]
        GC  -->  O["Oligodendrocytes"]
        GC  -->  OPC["O PCs"]
        GC  -->  E["Ependymal Cells"]

        A["ST -> PROTOProtoplasmic<br/>Gray matter"]
        A["ST -> FIBRFibrous<br/>White matter"]
        A["ST -> REACReactive<br/>A1/A2 phenotypes"]

        O["LG -> MYELMyelinating"]
        O["LG -> SATSatellite<br/>Perineuronal"]

        M["IC -> HOMEHomeostatic<br/>M0"]
        M["IC -> PROPro-inflammatory<br/>M1"]
        M["IC -> ANTIAnti-inflammatory<br/>M2"]
    end

    subgraph PNS_GliaPNS G"lia"
        S["Schwann Cells"]
        S["Satellite Glial Cells"]
        E["Enteric Glia"]

        S["C -> MYEPMyelinating"]
        S["C -> NONMNon-myelinating"]
    end

CNS Glial Cell Types

Astrocytes

• Astrocytes Main page

• Protoplasmic Astrocytes — Gray matter astrocytes

• Fibrous Astrocytes — White matter astrocytes

• Bergmann Glia — Cerebellar specialized astrocytes

• Radial Glia — Neural stem cells during development

• Tanycytes — Hypothalamic radial glia-like cells

• Müller Glia — Retinal glial cells

Key functions: ^{1Glutamate uptake2001 · Prog Neurobiol · PMID 11164987Open reference}: Glutamate homeostasis — GLT-1 and GLAST transporters clear synaptic glutamate ^{2Astrocyte-neuron metabolic coupling2012 · J Cereb Blood Flow Metab · PMID 23177785Open reference}: Metabolic support — Lactate shuttle provides energy to neurons via MCT1/4 ^{3Tripartite synapse1999 · Trends Neurosci · PMID 10689555Open reference}: Synaptic regulation — Tripartite synapse modulates transmission ^{4Astrocyte-endothelial interactions at the blood-brain barrier2006 · Nat Rev Neurosci · PMID 17049768Open reference}: Blood-brain barrier — Endfeet surround cerebral vasculature ^{5Neurotoxic reactive astrocytes2017 · Nature · PMID 28135239Open reference}: Reactive phenotypes — A1 (neurotoxic) vs A2 (neuroprotective) i

• MicrogliaMicroglia

• Microglia Main page

• Border-Associated Macrophages — Perivascular and meningeal macrophages

• Diseased-Associated Microglia — DAM phenotype in neurodegeneration

Key functions: ^{6Microglial surveillance2005 · Science · PMID 16191847Open reference}: Immune surveillance — Ramified processes constantly sample environment ^{7Synaptic pruning by microglia2008 · Cell · PMID 18833333Open reference}: Synaptic pruning — Complement-mediated elimination during development ^{8Microglia shape adult hippocampal neurogenesis2010 · Cell Stem Cell · PMID 20434963Open reference}: Phagocytosis — Clear debris and apoptotic cells ^{9Neuroinflammation in Alzheimer's disease2015 · Lancet Neurol · PMID 25505255Open reference}: Neuroinflammation — Release cytokines, ch

• Oligodendrocytesase

• Oligodendrocytess

• Oligodendrocytes Main page

• Oligodendrocyte Precursor Cells — NG2-glia, proliferative progenitors

• Myelinating Oligodendrocytes — Adult myelin maintenance

Key functions: ^{10Biology of oligodendrocyte and myelin2001 · Physiol Rev · PMID 11594923Open reference}: Myelination — Each cell myelinates multiple axon segments ^{2Astrocyte-neuron metabolic coupling2012 · J Cereb Blood Flow Metab · PMID 23177785Open reference}0: Metabolic support — Lactate transfer via MCT1 to axons ^{2Astrocyte-neuron metabolic coupling2012 · J Cereb Blood Flow Metab · PMID 23177785Open reference}1: Remyelination — Limited capacity for repair after injury

Ependymal Cells

• Ependymal Cells — Lining of ventricles

• Choroid Plexus Epithelium — CSF production

Key functions: CSF production, barrier function, waste clearance via glymphatic system

PNS Glial Cell Types

Schwann Cells

• Schwann Cells — Main page

• Myelinating Schwann Cells — Saltatory conduction

• Non-myelinating Schwann Cells — Remak bundles

Key functions: ^{2Astrocyte-neuron metabolic coupling2012 · J Cereb Blood Flow Metab · PMID 23177785Open reference}2: Myelination — One cell, one axon segment ^{2Astrocyte-neuron metabolic coupling2012 · J Cereb Blood Flow Metab · PMID 23177785Open reference}3: Nerve regeneration — Guide regrowing axons via Bands of Büngner ^{2Astrocyte-neuron metabolic coupling2012 · J Cereb Blood Flow Metab · PMID 23177785Open reference}4: Myelin proteins — PMP22, MPZ/P0, MBP in myelin structure

Satellite Glial Cells

• Satellite Glial Cells — Dorsal root ganglion

• Satellite Glial Trigeminal Neuralgia — Pain processing

Key functions: Sensory neuron support, ion homeostasis, pain modulation

Enteric Glia

• Enteric Glia — GI tract intrinsic glia

• Enteric Neurons Alzheimer’s Disease — Gut-brain axis

Glial Markers

Disease Relevance

Alzheimer’s Disease

• Reactive astrocytes — A1 phenotype contributes to neurotoxicity

• Microglial activation — DAM phenotype, TREM2 variants, complement cascade

• White matter changes — Oligodendrocyte dysfunction, demyelination

Parkinson’s Disease

• Astrocyte alpha-synuclein — Aggregation and spread

• Microglial inflammation — Chronic activation, NLRP3 inflammasome

• Oligodendrocyte alpha-synuclein — GCIs in MSA

ALS

• Astrocyte toxicity — SOD1 mutant astrocytes kill motor neurons

• Microglial activation — Disease propagation

• Oligodendrocyte dysfunction — MCT1 downregulation, energy failure

Multiple Sclerosis

• Demyelination — Immune attack on oligodendrocytes and myelin

• Remyelination failure — OPC differentiation block

• Astrogliosis — Glial scar formation

Other Conditions

• Schizophrenia — Oligodendrocyte gene expression changes

• Charcot-Marie-Tooth disease — Schwann cell myelin p

• [Neuroinflammation](/mechanisms/- [Blood-Brain Barrier](/mechanisms/blood-brain-barri

• [Neuroinflammation](/mechanisms/- [Blood-Brain Barrier](/mechanisms/blood-brain-barr

• [Neuroinflammation](/mechanisms/- Blood-Brain Barriernt

• [Neuroinflammation](/mechanisms/- Blood-Brain Barrierination

• Blood-Brain Barrier Glymphatic System

• Synaptic Pruning

See Also

• Neurons — Major brain cell type

• Alzheimer’s Disease

• Parkinson’s Disease

• Multiple Sclerosis

External Links

• Allen Brain Atlas — Brain gene expression data

• Glia Society — International glial cell organization

• PubMed — Biomedical literature