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- W1972126811 abstract "Protein kinase C (PKC) plays a prominent role in the regulation of a variety of cellular functions, including Ca2+ signalling. In HEK293 and Jurkat cells, the Ca2+ release and Ca2+ uptake stimulated by several different activators were attenuated by activation of PKC with phorbol myristate acetate (PMA) or 1-oleoyl-2-acetyl-sn-glycerol (OAG) and potentiated by PKC inhibition with Gö6983 or knockdown of PKCα or PKCβ using shRNA. Immunostaining and Western blotting analyses revealed that PKCα and PKCβII accumulated at the plasma membrane (PM) and that these isoforms, along with PKCβI, also translocated to the endoplasmic reticulum (ER) upon activation with PMA. Measurements of membrane fluidity showed that, like the cell membrane stabilizers bovine serum albumin (BSA) and ursodeoxycholate (UDCA), PMA and OAG significantly reduced the fluidity of both the PM and ER membranes; these effects were blocked in PKC-knockdown cells. Interestingly, both BSA and UDCA inhibited the Ca2+ responses to agonists to the same extent as PMA, whereas Tween 20, which increases membrane fluidity, raised the internal Ca2+ concentration. Thus, activation of PKC induces both translocation of PKC to the PM and ER membranes and downregulation of membrane fluidity, thereby negatively modulating Ca2+ flux." @default.
- W1972126811 created "2016-06-24" @default.
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- W1972126811 date "2011-02-01" @default.
- W1972126811 modified "2023-09-28" @default.
- W1972126811 title "A role for protein kinase C in the regulation of membrane fluidity and Ca2+ flux at the endoplasmic reticulum and plasma membranes of HEK293 and Jurkat cells" @default.
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- W1972126811 doi "https://doi.org/10.1016/j.cellsig.2010.11.005" @default.
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