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- W2083424297 abstract "The beneficial effects of therapeutic angiotensin-converting enzyme (ACE) inhibitor treatment against the worsening of glomerulosclerosis during the course of diabetic nephropathy have been widely documented. ACE inhibitors inhibit both angiotensin II formation and bradykinin (BK) degradation, thereby reducing angiotensin II type 1 (AT1) receptor activity and favoring B2-kinin receptor (B2 receptor) activation. Since the involvement of growth factors such as insulin-like growth factor (IGF-I) has been implicated in the early steps of diabetic nephropathy, we investigated the effect of BK on Erk 1 and 2 activation and cell proliferation by IGF-I.The activation of Erk 1 and 2 in mesangial cells (MCs) and isolated glomeruli (IG) was investigated by immunoprecipitation and Western blotting during activation of the IGF-I receptor in the presence or absence of BK and of protein kinase C (PKC), tyrosine-kinase and phosphatase selective inhibitors. Mesangial cell proliferation was assessed in vitro by cell counting.In untreated MCs and IG, when added separately, BK and IGF-I both activated Erk 1 and 2. In contrast, in MCs and IG pretreated with BK, the IGF-I-induced Erk 1 and 2 activation was dose-dependently reduced. The inhibitory effect of BK on IGF-I-induced activation of Erk 1 and 2 was completely abolished by addition of a B2 antagonist, by chelation of intracellular calcium and by tyrosine phosphatase inhibition. Additionally, BK reduced MC proliferation induced by IGF-I.A new inhibitory pathway of the early steps of IGF-I signaling by the B2 receptor is found both in cultured MCs and in IG, which involves a calcium-dependent tyrosine phosphatase activity. Recruitment of this mechanism may account for the beneficial effects of ACE inhibitor treatment on glomerulosclerosis associated with diabetic nephropathies." @default.
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- W2083424297 date "2002-08-01" @default.
- W2083424297 modified "2023-10-16" @default.
- W2083424297 title "Inhibition of IGF-I–induced Erk 1 and 2 activation and mitogenesis in mesangial cells by bradykinin" @default.
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- W2083424297 doi "https://doi.org/10.1046/j.1523-1755.2002.00475.x" @default.
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