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Orai, STIM1 and iPLA 2 β: a view from a different perspective
Author(s) -
Bolotina Victoria M.
Publication year - 2008
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.2008.154997
Subject(s) - stim1 , orai1 , endoplasmic reticulum , microbiology and biotechnology , signal transduction , mechanism (biology) , neuroscience , coupling (piping) , biology , chemistry , physics , materials science , quantum mechanics , metallurgy
The mechanism of store‐operated Ca 2+ entry (SOCE) remains one of the intriguing mysteries in the field of Ca 2+ signalling. Recent discoveries have resulted in the molecular identification of STIM1 as a Ca 2+ sensor in endoplasmic reticulum, Orai1 (CRACM1) as a plasma membrane channel that is activated by the store‐operated pathway, and iPLA 2 β as an essential component of signal transduction from the stores to the plasma membrane channels. Numerous studies have confirmed that molecular knock‐down of any one of these three molecules impair SOCE in a wide variety of cell types, but their mutual relations are far from being understood. This report will focus on the functional roles of Orai1, STIM1 and iPLA 2 β, and will address some specific questions about Orai1 and TRPC1, and their relation to SOC channels in excitable and non‐excitable cells. Also, it will analyse the novel role of STIM1 as a trigger for CIF production, and the complex relationship between STIM1 and Orai1 expression, puncta formation and SOCE activation. It will highlight some of the most recent findings that may challenge simple conformational coupling models of SOCE, and will offer some new perspectives on the complex relationships between Orai1, STIM1 and iPLA 2 β in the SOCE pathway.