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• W2014954303 endingPage "255" @default.
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• W2014954303 abstract "Canonical transient receptor potential 1 (TRPC1) Ca(2+)-permeable cation channels contribute to vascular tone and blood vessel remodeling and represent potential therapeutic targets for cardiovascular disease. Protein kinase C (PKC) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] are obligatory for native TRPC1 channel activation in vascular smooth muscle cells (VSMCs) but how PKC and PI(4,5)P2 act together to induce channel gating remains unresolved. The present study reveals that myristoylated alanine-rich C kinase substrate (MARCKS) protein coordinates activation of TRPC1 channels by PKC and PI(4,5)P2. TRPC1 channels and MARCKS form signaling complexes with PI(4,5)P2 bound to MARCKS; in this configuration TRPC1 channels are closed. Activators of TRPC1 channels induce PKC phosphorylation of TRPC1 proteins, which causes dissociation of TRPC1 subunits from MARCKS and release of PI(4,5)P2 from MARCKS; PI(4,5)P2 subsequently binds to TRPC1 subunits to induce channel opening. Calmodulin acting at, or upstream of, MARCKS is also required for TRPC1 channel opening through a similar gating mechanism involving PKC and PI(4,5)P2. These novel findings show that MARCKS coordinates native TRPC1 channel activation in VSMCs by acting as a reversible PI(4,5)P2 buffer, which is regulated by PKC-mediated TRPC1 phosphorylation. Moreover, our data provide evidence that PI(4,5)P2 is a gating ligand of TRPC1 channels." @default.
• W2014954303 created "2016-06-24" @default.
• W2014954303 creator A5003363567 @default.
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• W2014954303 date "2013-09-10" @default.
• W2014954303 modified "2023-09-30" @default.
• W2014954303 title "Myristoylated alanine‐rich C kinase substrate coordinates native TRPC1 channel activation by phosphatidylinositol 4,5‐bisphosphate and protein kinase C in vascular smooth muscle" @default.
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• W2014954303 doi "https://doi.org/10.1096/fj.13-238022" @default.
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