[No authors listed]
C-type natriuretic peptide (CNP) is believed to be produced locally in the kidneys and possess several renoprotective properties. In contrast, fibroblast growth factor (FGF) -23 elevates in the early stage of chronic kidney disease and predicts its outcomes. Currently, several studies have demonstrated that CNP and FGF-23 act through a close pathway, and moreover, FGF-23/mitogen-activated protein kinase (MAPK) can be obviously suppressed by CNP. In the present study, human mesangial cells (MCs) were incubated in serum-containing medium in the absence or presence of CNP (0, 10 and 100 pM) for 24, 48 and 72âh, respectively. CNP administration significantly suppresses MCs proliferation in a time- and dose-dependent manner. As a down-stream signaling of CNP activation, the expressions of natriuretic peptide receptor (NPR)-B, cyclic guanosine monophosphate-dependent protein kinases II and NPR-C were obviously augmented, whereas neutral endopeptidase expression was significantly decreased after CNP treatment in MCs. FGF-23, FGF receptor-1 and RAF-1 experienced a pronounced down-regulation in MCs with different doses of CNP throughout the whole observational period. CNP may dampen FGF-23 expression via MAPK signaling pathway in MCs.
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