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- W2053722108 abstract "The aim of the present study is to test the hypothesis that insulin-like-growth factor-1 (IGF-1) plays a role in the regulation of basolateral Cl channels in the thick ascending limb (TAL). The patch-clamp experiments demonstrated that application of IGF-I or insulin inhibited the basolateral 10-pS Cl channels. However, the concentration of insulin required for the inhibition of the Cl channels by 50% (K1/2) was ten times higher than those of IGF-1. The inhibitory effect of IGF-I on the 10-pS Cl channels was blocked by suppressing protein tyrosine kinase or by blocking phosphoinositide 3-kinase (PI3K). In contrast, inhibition of phospholipase C (PLC) failed to abolish the inhibitory effect of IGF-1 on the Cl channels in the TAL. Western blot analysis demonstrated that IGF-1 significantly increased the phosphorylation of phospholipid-dependent kinase (PDK) at serine residue 241 (Ser241) and AKT at Ser473 in the isolated medullary TAL. Moreover, inhibition of PI3K with LY294002 abolished the effect of IGF-1 on the phosphorylation of PDK and AKT. The notion that the effect of IGF-1 on the 10-pS Cl channels was induced by stimulation of PDK–AKT–mTOR pathway was further suggested by the finding that rapamycin completely abolished the effect of IGF-1 on the 10-pS Cl channels in the TAL. We conclude that IGF-1 inhibits the basolateral Cl channels by activating PI3K–AKT–mTOR pathways. The inhibitory effect of IGF-1 on the Cl channels may play a role in ameliorating the ischemia-induced renal injury through IGF-1 administration." @default.
- W2053722108 created "2016-06-24" @default.
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- W2053722108 date "2012-07-01" @default.
- W2053722108 modified "2023-10-11" @default.
- W2053722108 title "Insulin-like growth factor-1 (IGF-1) inhibits the basolateral Cl channels in the thick ascending limb of the rat kidney" @default.
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- W2053722108 doi "https://doi.org/10.1016/j.bbamcr.2012.04.015" @default.
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