Calcium microdomains: organization and function

Cell Calcium. Nov-Dec 2006;40(5-6):405-12. doi: 10.1016/j.ceca.2006.09.002. Epub 2006 Oct 9.

Abstract

Microdomains of Ca(2+), which are formed at sites where Ca(2+) enters the cytoplasm either at the cell surface or at the internal stores, are a key element of Ca(2+) signalling. The term microdomain includes the elementary events that are the basic building blocks of Ca(2+) signals. As Ca(2+) enters the cytoplasm, it produces a local plume of Ca(2+) that has been given different names (sparks, puffs, sparklets and syntillas). These elementary events can combine to produce larger microdomains. The significance of these localized domains of Ca(2+) is that they can regulate specific cellular processes in different regions of the cell. Such microdomains are particularly evident in neurons where both pre- and postsynaptic events are controlled by highly localized pulses of Ca(2+). The ability of single neurons to process enormous amounts of information depends upon such miniaturization of the Ca(2+) signalling system. Control of cardiac cell contraction and gene transcription provides another example of how the parallel processing of Ca(2+) signalling can occur through microdomains of intracellular Ca(2+).

Publication types

  • Review

MeSH terms

  • Animals
  • Calcium / metabolism*
  • Calcium Channels / physiology
  • Calcium Signaling / physiology*
  • Cardiomegaly / physiopathology
  • Heart / physiology
  • Histone Deacetylases / metabolism
  • Inositol 1,4,5-Trisphosphate Receptors / physiology
  • Membrane Microdomains / physiology*
  • Models, Biological
  • Myocardial Contraction / physiology
  • Neurons / physiology

Substances

  • Calcium Channels
  • Inositol 1,4,5-Trisphosphate Receptors
  • Hdac5 protein, mouse
  • Histone Deacetylases
  • Calcium