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Related Experiment Videos

Influence of CA2+ on K+ efflux during regulatory volume decrease in cultured astrocytes.

O Quesada1, B Ordaz, S Morales-Mulia

  • 1Institute of Cell Physiology, National University of Mexico, Mexico City, Mexico.

Journal of Neuroscience Research
|July 21, 1999
PubMed
Summary
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Potassium (K+) efflux in cerebellar astrocytes during hyposmotic stress is largely calcium (Ca2+)-independent. The Ca2+-dependent portion involves endoplasmic reticulum Ca2+ release and Ca2+/calmodulin signaling.

Area of Science:

  • Neuroscience
  • Cell Physiology
  • Ion Transport

Background:

  • Cultured cerebellar astrocytes exhibit potassium (K+) efflux when exposed to hyposmotic conditions.
  • Calcium (Ca2+) signaling plays a role in cellular responses to osmotic stress.

Purpose of the Study:

  • To investigate the dependence of hyposmolarity-activated potassium (K+) efflux on intracellular calcium (Ca2+) in cultured cerebellar astrocytes.
  • To elucidate the sources of Ca2+ involved and the signaling pathways mediating K+ efflux.

Main Methods:

  • Simultaneous measurement of 86Rubidium (86Rb) release (as a proxy for K+ efflux) and changes in cytosolic Ca2+ ([Ca2+]i).
  • Application of hyposmotic medium and various pharmacological agents including Ca2+ channel blockers, Ca2+ chelators, and calmodulin inhibitors.

Related Experiment Videos

  • Experiments conducted with and without extracellular Ca2+.

    • Main Results:

    • Hyposmotic stress significantly increased [Ca2+]i and 86Rb efflux.
    • Approximately 70% of the hyposmotic-induced 86Rb efflux was Ca2+-independent.
    • The Ca2+-dependent fraction of efflux was primarily mediated by Ca2+ release from the endoplasmic reticulum and involved Ca2+/calmodulin signaling.
    • Maxi-K+ channels may be involved at higher Ca2+ concentrations, but this threshold was not reached during hyposmotic swelling.

    Conclusions:

    • Hyposmotic-induced K+ efflux in cerebellar astrocytes is predominantly Ca2+-independent.
    • The Ca2+-dependent component of this efflux relies on intracellular Ca2+ stores and Ca2+/calmodulin pathways.
    • Specific ion channels, potentially maxi-K+ channels, are implicated but their activation requires higher Ca2+ levels than those achieved during swelling.