Endostatin attenuates PDGF-BB- or TGF-β1-induced HSCs activation via suppressing RhoA/ROCK1 signal pathways
Authors Ren H, Li Y, Chen Y, Wang L
Received 20 October 2018
Accepted for publication 19 December 2018
Published 11 January 2019 Volume 2019:13 Pages 285—290
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Amy Norman
Peer reviewer comments 3
Editor who approved publication: Dr Qiongyu Guo
Haitao Ren,1 Yuan Li,2 Yan Chen,3 Liang Wang4
1Department of Burns and Wound Care Center, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310009, P.R. China; 2Department of Ultrasound, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310006, P.R. China; 3Emergency Department, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116023, P.R. China; 4Department of Hepatobiliary and Pancreatic Surgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310009, P.R. China
Aim: To testify the hypothesis that endostatin exerts antifibrotic effects in hepatic stellate cells (HSCs) by modulating RhoA (ras homolog gene family, member A)/ROCK 1 (Rho-associated protein kinase 1) signal pathways.
Materials and methods: HSCs-T6 of passages 3–5 were cultured in DMEM and serum starved for 48 hours. HSCs were grouped as follows: control group, TGF-β1 (transforming growth factor β1) group, endostatin+TGF-β1 group, PDGF-BB (platelet-derived growth factor-BB) group, and endostatin+PDGF-BB group. In the PDGF-BB group, HSCs were treated with PDGF-BB (200 ng/mL) for 72 hours; in the TGF-β1 group, they were treated with TGF-β1 (10 ng/mL) for 72 hours. In the Endostatin+TGF-β1 group or Endostatin+PDGF-BB group, HSCs were treated with TGF-β1 (10 ng/mL) or PDGF-BB (200 ng/mL) for 72 hours after pretreatment with endostatin (5 µg/mL) for 1 hour. In the control group, HSCs were only treated with serum-free DMEM for 72 hours. Collagen I was analyzed with ELISA. F-actin was detected with immunofluorescent staining. The mRNAs and proteins of α-smooth muscle actin, RhoA, and ROCK1 were analyzed by using real-time PCR and Western blot, respectively.
Results: TGF-β1 and PDGF-BB promote the proliferation of HSCs significantly at 48 and 72 hours. Endostatin inhibits the proliferation effect induced by TGF-β1 or PDGF-BB significantly (P<0.01). The expression of collagen I and F-actin was significantly upregulated in both TGF-β1 and PDGF-BB groups than in the control group (P<0.01). Both the collagen I and F-actin expression were downregulated significantly in the endostatin-treated groups (P<0.05). Endostatin significantly inhibited the upregulated expression of α-smooth muscle actin, RhoA, and ROCK1 induced by TGF-β1 or PDGF-BB (P<0.01).
Conclusion: These results suggested that endostatin inhibited TGF-β1- or PDGF-BB-induced fibrosis in HSCs by modulating RhoA/ROCK signal pathways.
Keywords: endostatin, liver fibrogenesis, hepatic stellate cell, signal pathways, fibrosis
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