Ca2+ Microdomains Near Plasma Membrane Ca2+ Channels: Impact on Cell Function

J Physiol. 2008 Jul 1;586(13):3043-54. doi: 10.1113/jphysiol.2008.153460. Epub 2008 May 8.

Abstract

In eukaryotic cells, a rise in cytoplasmic Ca(2+) can activate a plethora of responses that operate on time scales ranging from milliseconds to days. Inherent to the use of a promiscuous signal like Ca(2+) is the problem of specificity: how can Ca(2+) activate some responses but not others? We now know that the spatial profile of the Ca(2+) signal is important Ca(2+) does not simply rise uniformly throughout the cytoplasm upon stimulation but can reach very high levels locally, creating spatial gradients. The most fundamental local Ca(2+) signal is the Ca(2+) microdomain that develops rapidly near open plasmalemmal Ca(2+) channels like voltage-gated L-type (Cav1.2) and store-operated CRAC channels. Recent work has revealed that Ca(2+) microdomains arising from these channels are remarkably versatile in triggering a range of responses that differ enormously in both temporal and spatial profile. Here, I delineate basic features of Ca(2+) microdomains and then describe how these highly local signals are used by Ca(2+)-permeable channels to drive cellular responses.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • Anura
  • Calcium Channels / metabolism*
  • Calcium Signaling
  • Cell Membrane / metabolism*
  • Humans
  • Neurons / physiology
  • Protein Structure, Tertiary

Substances

  • Calcium Channels