Cited by 108Neuroinflammation and Neurodegeneration MechanismsNeuroscience and Neuropharmacology ResearchNeurogenesis and neuroplasticity mechanisms

Astrocyte‐released cytokines induce ramification and outward K+ channel expression in microglia via distinct signalling pathways

Schilling, Tom, Nitsch, Robert, Heinemann, Uwe, Haas, Dorit, Eder, Claudia·2001·European Journal of Neuroscience

Abstract

Differentiation of microglial cells is characterized by transformation from ameboid into ramified cell shape and up-regulation of K+ channels. The processes of microglial differentiation are controlled by astrocytic factors. The mechanisms by which astrocytes cause developmental changes in morphological and electrophysiological properties of microglia have remained unclear. We show here that the cytokines transforming growth factor-beta (TGF-beta), macrophage colony-stimulating factor (M-CSF) and granulocyte/macrophage colony-stimulating factor (GM-CSF) are released by astrocytes at concentrations sufficient to induce ramification and up-regulation of delayed rectifier (DR) K+ channels in microglia. Transformation from ameboid into ramified morphology induced in microglia by exposure to astrocyte-conditioned medium (ACM) was inhibited by neutralizing antibodies against TGF-beta, M-CSF or GM-CSF, whilst ACM-induced DR channel expression was exclusively inhibited by antibodies against TGF-beta. Although both ramification and DR channel up-regulation occurred simultaneously, DR channel blockade by charybdotoxin failed to inhibit microglial ramification. The ACM-induced ramification of microglia was inhibited by the tyrosine kinase inhibitor genistein, whereas DR channel up-regulation did not occur in the presence of the serine/threonine kinase inhibitor H7. Our data suggest that astrocytes modulate processes of microglial differentiation in parallel but via distinct signalling pathways.

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Crossref · 10.1046/j.0953-816x.2001.01661.x

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49 of 49 references verified0 citation errors · 0 not checkable

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  • Others have reported that in vitro, TGF-β1 signaling induces a quiescent microglial phenotype and promotes resting microglial properties.

    “others have reported that in vitro, TGF-β1 signaling induces a quiescent microglial phenotype25 and promotes resting microglial properties26”
  • TGFβ is needed for murine microglia development in vivo and for maintaining the microglial-specific transcriptome signature.

    “TGFβ, a glia-derived cytokine, is needed for murine microglia development in vivo and in maintaining the microglial-specific transcriptome signature (Abutbul et al., 2012; Butovsky et al., 2014; Schilling et al., 2001).”

    From iPSC-derived human microglia-like cells to study neurological diseases (2017) · cites this paper as Schilling et al., 2001

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Authors
Schilling, T., Nitsch, R., Heinemann, U., Haas, D., & Eder, C.
Affiliations
Humboldt-Universität zu Berlin (DE)
Corresponding author
Eder, Claudia
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
2001-08
Volume
14
Issue
3
Pages
463-473
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W2093298450
Cited by
108
References
49
Citations by year
2026: 4 · 2025: 2 · 2024: 4 · 2023: 3 · 2022: 4 · 2021: 4 · 2020: 9 · 2019: 3 · 2018: 5 · 2017: 8 · 2016: 5 · 2015: 2 · 2014: 6 · 2013: 4 · 2012: 2
FWCI
1.21
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
microglial differentiation, astrocytes, cytokines, TGF-beta, macrophage colony-stimulating factor, GM-CSF, delayed rectifier potassium channel, microglial ramification, astrocyte-conditioned medium, genistein, H7, charybdotoxin, signaling pathways
MeSH terms
Animals, Astrocytes, Cell Differentiation, Cells, Cultured, Electrophysiology, Membranes, Potassium Channels, Signal Transduction, Macrophage Colony-Stimulating Factor, Granulocyte-Macrophage Colony-Stimulating Factor, Cytokines, Transforming Growth Factor beta, Microglia, Patch-Clamp Techniques, Potassium Channels, Voltage-Gated, Mice, Delayed Rectifier Potassium Channels

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