title: Suppression of hedgehog signaling regulates hepatic stellate cell activation and collagen secretion.
abstract: Hepatic stellate cells (HSCs) play an important role in liver fibrosis. This study investigates the expression of hedgehog in HSC and the role of hedgehog signaling on activation and collagen secretion of HSC. Liver ex vivo perfusion with collagenase IV and density gradient centrifugation were used to isolate HSC. Expression of hedgehog signaling components Ihh, Smo, Ptc, Gli2 and Gli3 in HSC were detected by RT-PCR. Hedgehog siRNA vectors targeting Ihh, Smo and Gli2 were constructed and transfected into HSC respectively. Suppression of hedgehog signaling were detected by SYBR Green fluorescence quantitative RT-PCR. Effects of hedgehog signaling inhibition on HSC activation and collagen I secretion were analyzed. Hedgehog signaling components Ihh, Smo, Ptc, Gli2 and Gli3 were expressed in HSC. siRNA vectors targeting Ihh, Smo and Gli2 were successfully constructed and decreased target gene expression. Suppression of hedgehog signaling significantly decreased the expression of α-SMA in HSC (P<0.01). Collagen type I secretion of HSC were also significantly decreased (P<0.01). In summary, HSC activation and collagen secretion can be regulated by hedgehog signaling. Hedgehog may play a role in the pathogenesis of liver fibrosis.
authors.affiliation: Department of Hepatobiliary Surgery, Peking University People's Hospital Xizhimen South Street, West District, Beijing 100044, P. R. China.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.affiliation: Department of Hepatobiliary Surgery, Peking University People's Hospital Xizhimen South Street, West District, Beijing 100044, P. R. China.
authors.forename: Xi-Sheng
authors.initials: XS
authors.lastname: Leng
authors.affiliation: Department of Hepatobiliary Surgery, Peking University People's Hospital Xizhimen South Street, West District, Beijing 100044, P. R. China.
authors.forename: Ji-Ye
authors.initials: JY
authors.lastname: Zhu
authors.affiliation: Department of Hepatobiliary Surgery, Peking University People's Hospital Xizhimen South Street, West District, Beijing 100044, P. R. China.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002478:Cells, Cultured; D003094:Collagen / Q000378:metabolism*; D004195:Disease Models, Animal; D055785:Gene Knockdown Techniques; D053823:Hedgehog Proteins / Q000378:metabolism*; D055166:Hepatic Stellate Cells / Q000378:metabolism*; D007150:Immunohistochemistry; D008103:Liver Cirrhosis / Q000378:metabolism* / Q000473:pathology; D034741:RNA, Small Interfering; D051381:Rats; D017208:Rats, Wistar; D060888:Real-Time Polymerase Chain Reaction; D015398:Signal Transduction / Q000502:physiology*
chemical_list: D053823:Hedgehog Proteins; D034741:RNA, Small Interfering; D003094:Collagen
keywords: Hepatic stellate cell; activation; collagen secretion; hedgehog; liver fibrosis
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