Cited by 60Neurogenesis and neuroplasticity mechanismsCell Adhesion Molecules ResearchNeuroinflammation and Neurodegeneration Mechanisms

CD81 Regulates Neuron-Induced Astrocyte Cell-Cycle Exit

Kelić, Sofija, Levy, Shoshana, Suarez, Carlos, Weinstein, David E.·2001·Molecular and Cellular Neuroscience

Abstract

Astrocytes respond to contact with neurons by cell-cycle arrest and complex process formation. In our effort to discover the molecular mechanisms that underlie this phenomenon we have identified a known tetraspanin, CD81, as a critical component of astrocyte responses to neuronal differentiation signals. Here we show that CD81 is expressed on the surface of the astrocyte and that its expression level can be modulated by contact with neurons. Further, using three separate antibodies, 2F7, Eat1, and Eat2, which recognize unique epitopes in the extracellular domains of the CD81 protein, we show that there is a unique domain, recognized by Eat1, that is required for astrocyte cell-cycle withdrawal in response to neurons. This is likely due to conformational changes in the CD81 molecule, as inclusion of 2F7 actually augments neuron-induced astrocyte growth arrest. The critical nature of CD81 in normal astrocyte-neuron biology was confirmed by using mice in which CD81 had been deleted by homologous recombination. Astrocytes null at the CD81 locus were blind to the proliferative arrest encoded on the neuronal cell surface. Taken together, these data strongly suggest that CD81 is a critical regulator of neuron-induced astrocytic differentiation.

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Registry

Crossref · 10.1006/mcne.2000.0955

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  • The proliferation of astrocytes and oligodendrocytes is responsive to trophic cues associated with neuronal activity.

    “The proliferation of both these glial cell types is responsive to trophic cues associated with neuronal activity (10–12).”

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Authors
Kelić, S., Levy, S., Suarez, C., & Weinstein, D. E.
Affiliations
  • Stanford Medicine (US)
  • Albert Einstein College of Medicine (US)
Corresponding author
Weinstein, David E.
Venue
Molecular and Cellular Neuroscience
Publisher
Elsevier BV
Published
2001-03
Volume
17
Issue
3
Pages
551-560
ISSN
1044-7431 (ISSN-L)
OpenAlex
W1996338382
Cited by
60
References
33
Citations by year
2026: 2 · 2025: 1 · 2024: 3 · 2023: 1 · 2022: 4 · 2021: 3 · 2020: 1 · 2019: 2 · 2018: 2 · 2013: 3 · 2012: 3
FWCI
1.30
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular and Cellular Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • James N. Kirby Foundation
  • Vetenskapsrådet
  • National Institutes of Health
  • National Cancer Institute (P01CA034233, CA 34233)
  • National Institute of General Medical Sciences (R01 GM5576001)
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
CD81, tetraspanins, astrocytes, astrocyte-neuron interaction, cell cycle arrest, astrocyte differentiation, conformational change
MeSH terms
Animals, Antibodies, Monoclonal, Epitopes, Antigens, Surface, Astrocytes, Cell Communication, Cell Cycle, Cell Differentiation, Cells, Cultured, Cerebellum, Female, Membrane Proteins, Mice, Inbred C57BL, Neurons, Pregnancy, Protein Binding, Antigens, CD, Rats, Sprague-Dawley, Mice, Rats, Tetraspanin 28

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