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Related Experiment Videos

Microinjected anti-actin antibodies decrease gap junctional intercellular commmunication in cultured astrocytes.

Carsten Theiss1, Karl Meller

  • 1Institut für Anatomie, Abteilung für Cytologie, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany.

Experimental Cell Research
|December 4, 2002
PubMed
Summary
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The actin cytoskeleton is crucial for gap junctional intercellular communication (GJIC) in astrocytes. Disrupting actin filaments with antibodies or cytochalasin D impairs GJIC, highlighting the importance of microfilament integrity.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Gap junctional intercellular communication (GJIC) facilitates direct cell-to-cell communication.
  • Astrocytes play vital roles in brain function and rely on GJIC for coordinated activity.
  • The role of the actin cytoskeleton in regulating GJIC in astrocytes remains incompletely understood.

Purpose of the Study:

  • To investigate the influence of the actin cytoskeleton on GJIC in cultured astrocytes.
  • To determine how disrupting actin dynamics affects gap junction permeability and connexin trafficking.

Main Methods:

  • Cultured astrocytes were used to study GJIC.
  • Microinjection of anti-actin antibodies and treatment with cytochalasin D were employed to disrupt the actin cytoskeleton.

Related Experiment Videos

  • Neurobiotin dye transfer assays were performed to measure GJIC.
  • Confocal laser scanning microscopy was utilized to visualize connexin 43 (Cx 43) translocation.

    • Main Results:

    • Microinjection of anti-actin antibodies significantly decreased GJIC in cultured astrocytes.
    • Treatment with cytochalasin D also impaired GJIC, with recovery observed after drug washout.
    • Anti-actin antibody injection led to impaired translocation of Cx 43 from the Golgi apparatus to the cell membrane.
    • Astrocytes displayed a prominent actin cytoskeleton with filaments localized at the plasma membrane.

    Conclusions:

    • The morphological integrity of microfilaments is fundamental for GJIC in astrocytes.
    • Actin cytoskeleton likely influences GJIC through associations with actin binding proteins and Cx 43 at the plasma membrane.
    • Disruption of actin dynamics impairs connexin transport, thereby affecting GJIC.