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- W2140713239 abstract "Alpha-actinins are critical components of the actin cytoskeleton. Here we show that alpha-actinins serve another important biological function by binding to and competitively inhibiting calcium-dependent activation of endothelial NOS (eNOS). Alpha-actinin-2 was found to associate with eNOS in a yeast two-hybrid screen. In vascular endothelial cells, which only express alpha-actinin-1 and -4, alpha-actinin-4 interacted and colocalized with eNOS. Addition of alpha-actinin-4 directly inhibited eNOS recombinant protein, and overexpression of alpha-actinin-4 inhibited eNOS activity in eNOS-transfected COS-7 cells and bovine aortic endothelial cells (BAECs). In contrast, knockdown of alpha-actinin-4 by siRNA increased eNOS activity in BAECs. The alpha-actinin-4-binding site on eNOS was mapped to a central region comprising the calmodulin-binding domain, and the eNOS-binding site on alpha-actinin-4 was mapped to the fourth spectrin-like rod domain, R4. Treatment of endothelial cells with a calcium ionophore, A23187, decreased alpha-actinin-4-eNOS interaction, leading to translocation of alpha-actinin-4 from plasma membrane to cytoplasm. Indeed, addition of calmodulin displaced alpha-actinin-4 binding to eNOS and increased eNOS activity. These findings indicate that eNOS activity in vascular endothelial cells is tonically and dynamically regulated by competitive interaction with alpha-actinin-4 and calmodulin." @default.
- W2140713239 created "2016-06-24" @default.
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- W2140713239 date "2008-01-07" @default.
- W2140713239 modified "2023-10-16" @default.
- W2140713239 title "Dynamic regulation of endothelial NOS mediated by competitive interaction with α‐actinin‐4 and calmodulin" @default.
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- W2140713239 doi "https://doi.org/10.1096/fj.07-9309com" @default.
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