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Deprecated: Implicit conversion from float 249.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Hepatology 2016 ; 63 (4): 1155-69 Nephropedia Template TP
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Inhibition of hedgehog signaling ameliorates hepatic inflammation in mice with nonalcoholic fatty liver disease (NAFLD) #MMPMID26473743
Kwon H; Song K; Han C; Chen W; Wang Y; Dash S; Lim K; Wu T
Hepatology 2016[Apr]; 63 (4): 1155-69 PMID26473743show ga
Hedgehog (Hh)-signaling plays a critical role in liver development, regeneration, injury repair and carcinogenesis. Activation of Hh signaling has been observed in patients with nonalcoholic fatty liver diseases (NAFLD); however, the pathobiological function and regulatory mechanism of hepatic Hh signaling in the pathogenesis of NAFLD remain to be further defined. This study was designed to examine the effect and mechanism of hepatic Hh signaling in high fat diet (HFD)-induced NAFLD by using pharmacological Smoothened inhibitors (GDC-0449 and LED225) and by using liver specific Smo knockout (Smo LKO) mice. Administration of Smo inhibitors to HFD-fed wild type mice significantly reduced the numbers of activated macrophages and decreased the expression of pro-inflammatory cytokines (TNF?, IL-1?, MCP1 and IL-6) as assessed by F4/80 immunohistochemistry and qRT-PCR, respectively. The Smo inhibitors were noted to have variable effects on hepatic fat accumulation. We observed that liver specific deletion of Smo also reduced macrophage activation and inhibited pro-inflammatory cytokine expression, while it did not significantly alter fat accumulation in the liver. Mechanistically, we found that activation of Gli1 by Hh signaling in primary hepatocytes increased the production of osteopontin (OPN) which subsequently enhanced macrophage-mediated pro-inflammatory response via a paracrine signaling. Conclusions: Hepatocyte Hh signaling can promote liver inflammation through OPN-mediated macrophage activation; this mechanism importantly contributes to the progression of NAFLD.