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• W2022021861 abstract "In non-excitable cells, the inositol 1,4,5-trisphosphate receptor (IP3R) is an intracellular Ca2+ channel which plays a major role in Ca2+ signalling. Three isoforms of IP3R have been identified (IP3R-1, IP3R-2 and IP3R-3) and most cell types express different proportions of each isoform. The differences between the pharmacological and functional properties of the various isoforms of IP3R are poorly known. RINm5F cells who express almost exclusively (∼90%) the IP3R-3, represent an interesting model to study this particular isoform. Here, we investigated a regulatory mechanism by which protein kinase C (PKC) may influence IP3R-3-mediated Ca2+ release. With an immunoprecipitation approach we confirmed that RINm5F cells express almost exclusively the IP3R-3 isoform. With an in vitro phosphorylation approach, we showed that the immunopurified IP3R-3 was efficiently phosphorylated by exogenous PKC. With a direct in cellulo approach and an indirect in cellulo back-phosphorylation approach we showed that phorbol-12-myristate-13-acetate (PMA) causes the phosphorylation of IP3R-3 in intact RINm5F cells. In saponin-permeabilized RINm5F cells, 3-induced Ca2+ release was reduced after a pre-treatment with PMA. PMA also reduced the Ca2+ response of intact RINm5F cells stimulated with carbachol and EGF, two agonists that use different receptor types to activate phospholipase C. These results suggest the existence of a negative feedback mechanism involving two components of the Ca2+ signalling cascade, whereby activated PKC dampens IP3R-3 activity." @default.
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• W2022021861 date "2007-09-01" @default.
• W2022021861 modified "2023-10-16" @default.
• W2022021861 title "Protein kinase C decreases the apparent affinity of the inositol 1,4,5-trisphosphate receptor type 3 in RINm5F cells" @default.
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• W2022021861 doi "https://doi.org/10.1016/j.ceca.2007.01.002" @default.
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