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Related Experiment Videos

Changes of actin cytoskeleton during swelling and regulatory volume decrease in cultured astrocytes

J Morán1, M Sabanero, I Meza

  • 1Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, México DF.

The American Journal of Physiology
|December 1, 1996
PubMed
Summary

Swelling alters astrocyte actin cytoskeleton organization, but this change is reversible. Disrupting the actin cytoskeleton with cytochalasins did not affect regulatory volume decrease (RVD).

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Area of Science:

  • Cell biology
  • Cytoskeleton dynamics
  • Astrocyte physiology

Background:

  • Astrocytes play crucial roles in brain function.
  • Cell volume regulation is vital for astrocyte homeostasis.
  • The actin cytoskeleton's role in astrocyte volume regulation is not fully understood.

Purpose of the Study:

  • To investigate the impact of hyposmotic swelling on the astrocyte actin cytoskeleton.
  • To determine the role of the actin cytoskeleton in regulatory volume decrease (RVD) in astrocytes.
  • To examine the effects of cytoskeleton-disrupting agents on astrocyte volume regulation and ion/solute efflux.

Main Methods:

  • Cultured astrocytes were exposed to hyposmotic medium.
  • Changes in the filamentous actin (F-actin) cytoskeleton were visualized.

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  • The effects of cytochalasins B and D on RVD and solute efflux were assessed.
  • The impact of p-chloromercuribenzenesulfonate on cell volume and solute release was evaluated.

    • Main Results:

    • Hyposmotic swelling caused diffuse F-actin in the cell body and concentration at retracted projection tips.
    • These cytoskeletal changes were reversible, with cells regaining their shape within 2 hours.
    • Cytochalasins did not affect RVD or swelling-activated efflux of chloride and inositol.
    • p-Chloromercuribenzenesulfonate disrupted the cytoskeleton, induced shrinkage, and reduced swelling-stimulated taurine and iodide efflux.

    Conclusions:

    • Actin cytoskeleton rearrangements during swelling are reversible and may be involved in RVD mechanisms.
    • Cytochalasin-induced disruption of the actin cytoskeleton is unrelated to the RVD process.
    • Further research is needed to fully elucidate the actin cytoskeleton's role in astrocyte volume regulation.