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- W2008227320 abstract "The ER Ca2+ sensor STIM1 and the Ca2+ channel Orai1 are key players in store-operated Ca2+ entry (SOCE). In addition, channels from the TRPC family were also shown to be engaged during SOCE, while their precise implication remains controversial. In this study, we investigated the molecular players involved in SOCE triggered by the SERCA pump inhibitor thapsigargin in an endothelial cell line, the EA.hy926. siRNA directed against STIM1 or Orai1 reduced Ca2+ entry by about 50–60%, showing that a large part of the entry is independent from these proteins. Blocking the PLC or the PKC pathway completely abolished thapsigargin-induced Ca2+ entry in cells depleted from STIM1 and/or Orai1. The phorbol ester PMA or the DAG analog OAG restored the Ca2+ entry inhibited by PLC blockers, showing an involvement of PLC/PKC pathway in SOCE. Using pharmacological inhibitors or siRNA revealed that the PKCeta is required for Ca2+ entry, and pharmacological inhibition of the tyrosine kinase Src also reduced Ca2+ entry. TRPC3 silencing diminished the entry by 45%, while the double STIM1/TRPC3 invalidation reduced Ca2+ entry by more than 85%. Hence, in EA.hy926 cells, TG-induced Ca2+ entry results from the activation of the STIM1/Orai1 machinery, and from the activation of TRPC3." @default.
- W2008227320 created "2016-06-24" @default.
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- W2008227320 date "2011-02-01" @default.
- W2008227320 modified "2023-10-01" @default.
- W2008227320 title "Thapsigargin activates Ca2+ entry both by store-dependent, STIM1/Orai1-mediated, and store-independent, TRPC3/PLC/PKC-mediated pathways in human endothelial cells" @default.
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- W2008227320 doi "https://doi.org/10.1016/j.ceca.2010.12.001" @default.
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