Osteopontin promotes collagen I synthesis in hepatic stellate cells by miRNA-129-5p inhibition

Journal Article · Mon Jan 15 00:00:00 EST 2018 · Experimental Cell Research

DOI:https://doi.org/10.1016/J.YEXCR.2017.11.035· OSTI ID:23082503

Chen, Yinghua ^[1]; Ou, Yitao ^[2]; Dong, Jiale; Yang, Guizhi; Zeng, Zhi; Liu, Ying; Liu, Bing; Li, Weidong ^[2]; He, Xiaoshun ^[1]; Lan, Tian ^[2]

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1. Organ Transplantation Center, the First Affiliat ed Hospital of Sun Yat-sen University, Guangzhou 510080 (China)
2. Guangdong Pharmaceutical University, Guangzhou 510006 (China)

Activation of hepatic stellate cells (HSCs) is an essential event in the initiation and progression of liver fibrosis. HSCs are believed to be the major source of collagen-producing myofibroblasts in fibrotic livers. A key feature in the pathogenesis of liver fibrosis is fibrillar Collagen I (Col 1) deposition. Osteopontin (OPN), an extracellular matrix (ECM) cytokine expressed in HSCs, could drive fibrogenesis by modulating the HSC pro-fibrogenic phenotype and Col 1 expression. Here, we aimed to investigate the molecular mechanism of OPN regulating the activation of HSCs. Our results showed that hepatic expression of OPN was increased in patients with liver fibrosis. In addition, hepatic OPN was positively correlated with Col 1 and α-SMA. Recombinant OPN (rOPN) upregulated Col 1 and α-SMA expression in LX-2 cells. However, OPN knockdown downregulated Col 1 expression. The 3′-UTR of the collagen 1 (Col 1) was identified to bind miR-129-5p. Transfection of miR-129-5p mimic in HSC resulted in a marked reduction of Col 1 expression. Conversely, a decrease in miR-129-5p in HSCs transfected by anti-sense miR-129-5p (AS-miR-129-5p) caused Col 1 upregulation. Furthermore, luciferase reporter assay showed that miR-129-5p directly target the 3′-UTR of Col1α1 mRNA via repressing its post-transcriptional activities. Finally, miR-129-5p level was decreased in fibrotic liver of human, and reduced by rOPN treatment. In contrast, miR-129-5p was induced in HSCs transfected by OPN siRNA. These data suggested that OPN induces Col 1 expression via suppression of miR-129-5p in HSCs.

• OSTI ID: 23082503
• Journal Information: Experimental Cell Research, Vol. 362, Issue 2; Other Information: Copyright (c) 2017 Elsevier Inc. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0014-4827
• Country of Publication: United States
• Language: English

Related Subjects

60 APPLIED LIFE SCIENCES
FIBROSIS
LIVER
LUCIFERASE
LYMPHOKINES
MESSENGER-RNA
PATHOGENESIS