Cellular and Molecular Life Sciences

, Volume 70, Issue 15, pp 2637–2656

Molecular regulation of CRAC channels and their role in lymphocyte function

  • Patrick J. Shaw
  • Bin Qu
  • Markus Hoth
  • Stefan Feske
Review

DOI: 10.1007/s00018-012-1175-2

Cite this article as:
Shaw, P.J., Qu, B., Hoth, M. et al. Cell. Mol. Life Sci. (2013) 70: 2637. doi:10.1007/s00018-012-1175-2

Abstract

Calcium (Ca2+) influx is required for the activation and function of all cells in the immune system. It is mediated mainly by store-operated Ca2+ entry (SOCE) through Ca2+ release-activated Ca2+ (CRAC) channels located in the plasma membrane. CRAC channels are composed of ORAI proteins that form the channel pore and are activated by stromal interaction molecules (STIM) 1 and 2. Located in the membrane of the endoplasmic reticulum, STIM1 and STIM2 have the dual function of sensing the intraluminal Ca2+ concentration in the ER and to activate CRAC channels. A decrease in the ER’s Ca2+ concentration induces STIM multimerization and translocation into puncta close to the plasma membrane where they bind to and activate ORAI channels. Since the identification of ORAI and STIM genes as the principal mediators of CRAC channel function, substantial advances have been achieved in understanding the molecular regulation and physiological role of CRAC channels in cells of the immune system and other organs. In this review, we discuss the mechanisms that regulate CRAC channel function and SOCE, the role of recently identified proteins and mechanisms that modulate the activation of ORAI/STIM proteins and the consequences of CRAC channel dysregulation for lymphocyte function and immunity.

Keywords

T cellsLymphocytesCalciumCRAC channelsSTIM1ORAI1

Copyright information

© Springer Basel 2012

Authors and Affiliations

  • Patrick J. Shaw
    • 1
  • Bin Qu
    • 2
  • Markus Hoth
    • 2
  • Stefan Feske
    • 1
  1. 1.Department of PathologyNew York University Medical CenterNew YorkUSA
  2. 2.Department of BiophysicsSaarland UniversityHomburgGermany