Ca2+ influx at the ER/PM junctions. (May 2017)

• Record Type: Journal Article
• Authors: Chung, Woo Young; Jha, Archana; Ahuja, Malini; Muallem, Shmuel
• Is Part Of: Cell calcium. Volume 63(2017)
• Page Start: 29
• Page End: 32
• Publication Date: 2017-05
• Subjects: ER/PM junctions -- Ca2+ influx -- SOCs -- STIM1 -- Orais -- TRPCs; Calcium -- Metabolism -- Periodicals; Vertebrates -- Physiology -- Periodicals; Calcium -- Physiological effect -- Periodicals; Cell physiology -- Periodicals; Calcium in the body -- Periodicals; 572.516
• DOI: 10.1016/j.ceca.2017.02.009
• Languages: English
• ISSNs: 0143-4160

Abstract

Graphical abstract: Highlights: Tethers at the ER/PM junctions. STIM1-TRPC complexes at the ER/PM junctions. STIM1-Orai1 complexes at the ER/PM junctions. Abstract: Ca 2+ influx across the plasma membrane is a key component of the receptor-evoked Ca 2+ signaling that mediate numerous cell functions and reload the ER after partial or full ER Ca 2+ store depletion. Ca 2+ influx is activated in response to Ca 2+ release from the ER, a concept developed by Jim Putney, and the channels mediating the influx are thus called store-operated Ca 2+ influx channels, or SOCs. The molecular identity of the SOCs has been determined with the identification of the TRPC channels, STIM1 and the Orai channels. These channels are targeted to, operate and are regulated when at the ER/PM junctions. ER/PM junctions are a form of membrane contact sites (MCSs) that are present in all parts of the cells, where the ER makes contacts with cellular membranes and organelles. MCSs have many cellular functions, and are the sites of lipid and Ca 2+ transport and delivery between organelles. This short review discusses aspects of MCSs in the context of Ca 2+ transport.