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- W1991001519 abstract "To demonstrate the interactions of PKCgamma with caveolin (Cav)-1 and connexin(Cx)43 in lipid rafts and its regulation of gap junctions.N/N1003A lens epithelial cells, bovine primary lens epithelial cells, and stably transfected N/N1003A lens epithelial cells were used. Coimmunoprecipitation and Western blot analysis were used to detect protein expression and their interactions. Cav-1-containing lipid rafts and redistribution of Cav-1, PKCgamma, and Cx43 were analyzed by sucrose gradients and by consequent Western blot analysis. Cell surface gap junction Cx43 plaques were detected by confocal microscopy. PKCgamma activity was measured with a PKC assay kit.Cav-1 and -2 were found in N/N1003A and bovine primary lens epithelial cells. Cx43 was associated with Cav-1 in lipid rafts. Phorbol ester (TPA) and insulin-like growth factor (IGF)-1 recruited PKCgamma into Cav-1-containing lipid rafts and stimulated the interactions of PKCgamma with Cav-1 and Cx43. TPA and IGF-1 induced redistribution of Cav-1 and Cx43 from light-density fractions to higher density fractions on sucrose gradients. PKCgamma redistributed with Cav-1- and Cx43-containing fractions on stimulation with TPA or IGF-1. Overexpression of PKCgamma-enhanced green fluorescent protein (EGFP) increased the interaction of PKCgamma-EGFP with Cav-1 and Cx43 and decreased gap junction Cx43 plaques without exogenous growth factors. Overexpression of a loss-of-function PKCgamma mutant did not decrease gap junction Cx43 plaques or cause redistribution in lipid rafts, even though the PKCgamma mutant still interacted with Cav-1 and Cx43.Activation of PKCgamma by TPA or IGF-1 stimulated the interaction of PKCgamma with Cav-1 and Cx43 in lipid rafts, causing Cx43, Cav-1, and PKCgamma to redistribute within the lipid rafts, and this resulted in a decrease in gap junction plaques." @default.
- W1991001519 created "2016-06-24" @default.
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- W1991001519 date "2003-12-01" @default.
- W1991001519 modified "2023-10-10" @default.
- W1991001519 title "Protein Kinase Cγ Regulation of Gap Junction Activity through Caveolin-1–Containing Lipid Rafts" @default.
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- W1991001519 doi "https://doi.org/10.1167/iovs.03-0296" @default.
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