title: Sonic hedgehog is a novel tubule-derived growth factor for interstitial fibroblasts after kidney injury.
abstract: Tubular epithelium constitutes the majority of the renal parenchyma and is the primary target of various kidney injuries. However, how the injured tubules drive interstitial fibroblast activation and proliferation remains poorly understood. Here, we investigated the role of sonic hedgehog (Shh), a secreted extracellular signaling protein, in fibroblast proliferation. Shh was induced in renal tubular epithelia in animal models of CKD induced by ischemia/reperfusion injury (IRI), adriamycin, or renal mass ablation, and in renal tubules of kidney biopsy specimens from CKD patients with different etiologies. Using Gli1-CreER(T2) reporter mice, we identified interstitial fibroblasts as the principal targets of renal Shh signaling in vivo. In vitro, incubation with Shh promoted normal rat kidney fibroblast proliferation, which was assessed by cell counting, MTT assay, and BrdU incorporation assay, and stimulated the induction of numerous proliferation-related genes. However, Shh had no effect on the proliferation of renal tubular epithelial cells. In vivo, overexpression of Shh promoted fibroblast expansion and aggravated kidney fibrotic lesions after IRI. Correspondingly, blockade of Shh signaling by cyclopamine, a small molecule inhibitor of Smoothened, inhibited fibroblast proliferation, reduced myofibroblast accumulation, and attenuated renal fibrosis. These studies identify Shh as a novel, specific, and potent tubule-derived growth factor that promotes interstitial fibroblast proliferation and activation. Our data also suggest that blockade of Shh signaling is a plausible strategy for therapeutic intervention of renal fibrosis.
authors.affiliation: Departments of Pathology, and.
authors.forename: Dong
authors.initials: D
authors.lastname: Zhou
authors.affiliation: Departments of Pathology, and.
authors.forename: Yingjian
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Organ Failure Research, Nanfang Hospital, Southern Medical University and Guangdong Provincial Institute of Nephrology, Guangzhou, China.
authors.forename: Lili
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; and.
authors.forename: Roderick J
authors.initials: RJ
authors.lastname: Tan
authors.affiliation: State Key Laboratory of Organ Failure Research, Nanfang Hospital, Southern Medical University and Guangdong Provincial Institute of Nephrology, Guangzhou, China.
authors.forename: Liangxiang
authors.initials: L
authors.lastname: Xiao
authors.affiliation: State Key Laboratory of Organ Failure Research, Nanfang Hospital, Southern Medical University and Guangdong Provincial Institute of Nephrology, Guangzhou, China.
authors.forename: Min
authors.initials: M
authors.lastname: Liang
authors.affiliation: State Key Laboratory of Organ Failure Research, Nanfang Hospital, Southern Medical University and Guangdong Provincial Institute of Nephrology, Guangzhou, China.
authors.forename: Fan Fan
authors.initials: FF
authors.lastname: Hou
authors.affiliation: Departments of Pathology, and State Key Laboratory of Organ Failure Research, Nanfang Hospital, Southern Medical University and Guangdong Provincial Institute of Nephrology, Guangzhou, China liuy@upmc.edu.
authors.forename: Youhua
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000328:Adult; D000818:Animals; D001706:Biopsy; D049109:Cell Proliferation; D004195:Disease Models, Animal; D018450:Disease Progression; D005260:Female; D005347:Fibroblasts / Q000502:physiology*; D005355:Fibrosis; D053823:Hedgehog Proteins / Q000378:metabolism*; D006801:Humans; D007668:Kidney / Q000473:pathology; D007684:Kidney Tubules / Q000378:metabolism; D008297:Male; D008807:Mice, Inbred BALB C; D008875:Middle Aged; D009400:Nephrosclerosis / Q000378:metabolism*; D017207:Rats, Sprague-Dawley; D051436:Renal Insufficiency, Chronic / Q000378:metabolism*; D015854:Up-Regulation; D055815:Young Adult
chemical_list: D053823:Hedgehog Proteins
keywords: cell proliferation; chronic renal disease; fibroblast; renal fibrosis; sonic hedgehog
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