Abstract
Background
Periostin is a matricellular protein that serves as a ligand for integrins and is required for tissue remodeling and fibrosis. We investigated the role of periostin in hepatic fibrosis and the mechanisms involved.
Methods
Primary hepatic stellate cells (HSCs) and the HSC-immortalized cell line LX2 were used to study the profibrotic property of periostin and the interaction of periostin with integrins. Wild-type and periostin-deficient (periostin−/−) mice were subjected to two distinct models of liver fibrosis induced by hepatotoxic (carbon tetrachloride or thioacetamide) or cholestatic (3.5-diethoxycarbonyl-1.4-dihydrocollidine) injury.
Results
Periostin expression in HSCs and LX2 cells increased in association with their activation. Gene silencing of periostin resulted in a significant reduction in the levels of profibrotic markers. In addition to enhanced cell migration in response to periostin, LX2 cells incubated on periostin showed significant induction of α-smooth muscle actin and collagen, indicating a profibrotic property. An antibody targeting αvβ5 and αvβ3 integrins suppressed cell attachment to periostin by 60 and 30 % respectively, whereas anti-α5β1 antibody had no effect. Consistently, αv integrin-silenced LX2 cells exhibited decreased attachment to periostin, with a significant reduction in the levels of profibrotic markers. Moreover, these profibrotic effects of periostin were observed in the mouse models. In contrast to extensive collagen deposition in wild-type mice, periostin−/− mice developed less noticeable hepatic fibrosis induced by hepatotoxic and cholestatic liver injury. Accordingly, the profibrotic markers were significantly reduced in periostin−/− mice.
Conclusion
Periostin exerts potent profibrotic activity mediated by αv integrin, suggesting the periostin–αv integrin axis as a novel therapeutic target for hepatic fibrosis.
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Abbreviations
- Col1α1:
-
Collagen type I, alpha 1
- DDC:
-
3,5-Diethoxycarbonyl-1,4-dihydrocollidine
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- ECM:
-
Extracellular matrix
- FBS:
-
Fetal bovine serum
- HSC:
-
Hepatic stellate cell
- siRNA:
-
Small interfering RNA
- α-SMA:
-
α-Smooth muscle actin
- TAA:
-
Thioacetamide
- TGF:
-
Transforming growth factor
- TIMP-1:
-
Tissue inhibitor of metalloproteinase 1
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Acknowledgments
Part of this study was presented at 114th Annual Meeting and the 116th Annual Meeting of the American Gastroenterological Association. This work was supported by a Grant-in-Aid from the Ministry of Health, Labor and Welfare of Japan to Susumu Tazuma and in part by the Japan Society for the Promotion of Science KAKENHI grants Scientific Research (B) 26293174 and Challenging Exploratory Research 24659367 to Yasuyuki Yokosaki. Experiments were conducted in part at the Analysis Center of Life Science, Hiroshima University.
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Kenji Izuhara received a research grant from Chugai Pharmaceutical Co. Ltd and unrestricted grant from Shino-test Co. Ltd, and serves as a consultant to Chugai Pharmaceutical Co. Ltd. and AQUA Therapeutics Co. Ltd.
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Sugiyama, A., Kanno, K., Nishimichi, N. et al. Periostin promotes hepatic fibrosis in mice by modulating hepatic stellate cell activation via αv integrin interaction. J Gastroenterol 51, 1161–1174 (2016). https://doi.org/10.1007/s00535-016-1206-0
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DOI: https://doi.org/10.1007/s00535-016-1206-0