title: Store-operated Ca(2+) entry.
abstract: Store-operated Ca(2+) entry (SOCE) is an ubiquitous and major mechanism for Ca(2+) influx in mammalian cells with important physiological relevance. Since the discovery of SOCE in 1986 both, the mechanism that communicates the amount of Ca(2+) accumulated in the intracellular Ca(2+) stores to the plasma membrane channels and the nature of the capacitative channels, have been a matter of intense investigation. During the last decade, two of the major elements of SOCE, STIM1, the Ca(2+) sensor of the intracellular Ca(2+) compartments, and Orai1, the protein forming the channel that conducts the capacitative Ca(2+) release-activated current I               (CRAC), were identified. Together with these proteins, different homologues, including STIM2, Orai2 and Orai3, were identified, although their relevance in SOCE has not been fully characterized yet. Before the identification of STIM1 and Orai1, TRPC proteins were found to be involved in SOCE in different cell types, more likely conducting the non-selective capacitative current described as I               (SOC). Current evidence indicates that STIM1, Orai1 and TRPC proteins dynamically interact forming a ternary complex that mediates SOCE in a number of cellular models. The dynamic interaction of STIM1 with Orai1, TRPCs or both might provide an explanation to the distinct capacitative currents described in different cell types.
authors.affiliation: Department of Physiology, Cell Physiology Research Group, University of Extremadura, Cáceres 10003, Spain.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Berna-Erro
authors.forename: Pedro C
authors.initials: PC
authors.lastname: Redondo
authors.forename: Juan A
authors.initials: JA
authors.lastname: Rosado
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D015220:Calcium Channels / Q000502:physiology; D015815:Cell Adhesion Molecules / Q000502:physiology; D006801:Humans; D008565:Membrane Proteins / Q000502:physiology; D009363:Neoplasm Proteins / Q000502:physiology; D000071740:ORAI1 Protein; D000071741:ORAI2 Protein; D000071737:Stromal Interaction Molecule 1; D000071738:Stromal Interaction Molecule 2
chemical_list: D015220:Calcium Channels; D015815:Cell Adhesion Molecules; D008565:Membrane Proteins; D009363:Neoplasm Proteins; D000071740:ORAI1 Protein; C510746:ORAI1 protein, human; D000071741:ORAI2 Protein; C514506:ORAI2 protein, human; C522867:Orai3 protein, human; C103530:STIM1 protein, human; C513279:STIM2 protein, human; D000071737:Stromal Interaction Molecule 1; D000071738:Stromal Interaction Molecule 2; D002118:Calcium