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Hepatocyte growth factor counteracts transforming growth factor-beta1, through attenuation of connective tissue growth factor induction, and prevents renal fibrogenesis in 5/6 nephrectomized mice.
FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology 2003 Februrary
We investigated the mechanism of the anti-fibrotic effects of hepatocyte growth factor (HGF) in the kidney, with respect to its effect on connective tissue growth factor (CTGF), a down-stream, profibrotic mediator of transforming growth factor-beta1 (TGF-beta1). In wild-type (WT) mice with 5/6 nephrectomy (Nx), HGF and TGF-beta1 mRNAs increased transiently in the remnant kidney by week 1 after the Nx, returned to baseline levels, and increased again at weeks 4 to 12. In contrast, CTGF and alpha1(I) procollagen (COLI) mRNAs increased in parallel with HGF and TGF-beta1 during the early stage, but did not re-increase during the late stage. In the case of TGF-beta1 transgenic (TG) mice with 5/6 Nx, excess TGF-beta1 derived from the transgene enhanced CTGF expression significantly in the remnant kidney, accordingly accelerating renal fibrogenesis. Administration of dHGF (5.0 mg/kg/day) to TG mice with 5/6 Nx for 4 weeks from weeks 2 to 6 suppressed CTGF expression in the remnant kidney, attenuating renal fibrosis and improving the survival rate. In an experiment in vitro, renal tubulointerstitial fibroblasts (TFB) were co-cultured with proximal tubular epithelial cells (PTEC). Pretreatment with HGF reduced significantly CTGF induction in PTEC by TGF-beta1, consequently suppressing COLI synthesis in TFB. In conclusion, HGF can block, at least partially, renal fibrogenesis promoted by TGF-beta1 in the remnant kidney, via attenuation of CTGF induction.
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