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  • Title: [Role of Ca2+/calmodulin-dependent calcineurin signaling pathway in neuropeptide Y-induced cardiac hypertrophy in rats].
    Author: Li XY, Chen MS, Huang SH, Dong Q, Li YH, Zhang S, Liu ZX.
    Journal: Nan Fang Yi Ke Da Xue Xue Bao; 2008 Dec; 28(12):2139-41. PubMed ID: 19114340.
    Abstract:
    OBJECTIVE: To investigate the role of Ca(2+)/calmodulin-dependent calcineurin (CaN) signaling pathway in neuropeptide Y (NPY)-induced cardiomyocyte hypertrophy in rat. METHODS: Cardiomyocytes of neonatal Wistar rats were cultured in the presence of 10 and 100 nmol/L NPY, and cyclosporine A (CsA) was applied to inhibit the activity of CaN. The protein synthesis rate, c-jun mRNA expression, CaN protein expression, CaN activity and intracellular Ca(2+) concentration in the cardiomyocytes were assessed. RESULTS: Compared with the control group, (3)H-Leu incorporation and expression of c-jun mRNA in the cardiomyocytes treated with 100 nmol/L NPY increased significantly (P<0.05, P<0.001), and the effect of NPY was blocked by CsA. The activity of CaN (P<0.05), CaN expression (P<0.05), and Ca(2+) concentration in the cytoplasm (P<0.001) and nuclei (P<0.001) of the cells with 100 nmol/L NPY treatment also significantly increased compared with those in the control cells. CONCLUSION: NPY can induce cardiomyocyte hypertrophy in rats, in which process Ca(2+)/calmodulin-dependent CaN signaling pathway plays an important role.
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