Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 499, Issue 1, Pages 59-65Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2018.03.126
Keywords
R-spondin3; LGR4; beta-catenin; Hypoxia/reoxygenation injury; Hepatocytes
Categories
Funding
- National Key R&D Program of China [2017YFC0908900]
- National Natural Science Foundation of China [81730020, 81330010, 81390354]
- National Institutes of Health [1R01DK110273-01A1]
- NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES [R01DK110273] Funding Source: NIH RePORTER
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Background & aims: Leucine-rich repeat G-protein-coupled receptor 4 (LGR4) and its ligands R-spondin l-4 (Rspos) have been vastly investigated in embryonic development. The biological functions of Rspos-LGR4 system in liver remains largely unknown. Here, we explored whether it protects hepatocytes against hypoxia/reoxygenation (H/R) induced damage.& para;& para;Methods: H/R injury was induced by dimethyloxalylglycine (DMOG) in AML12 cells and the effects of Rspo3 on cell proliferation and apoptosis were assessed. Specific shRNAs were used to interfere LGR4 or beta-catenin.& para;& para;Results: DMOG caused hepatocytes damage evidenced by increase in HIF-1 alpha, cell death and apoptosis genes p27 and Bax, with concurrent decrease of cell proliferation genes PCNA and CyclinD1. Of all the Rspos, Rspo3 is predominantly expressed in AML12 hepatocytes. Importantly, Rspo3 demonstrated an alteration in a manner similar to proliferation-related genes during H/R injury. Rspo3 pretreatment rendered hepatocytes less vulnerable to DMOG induced H/R injury. Ablation of LGR4 using shRNA attenuated the protective effects of Rspo3. Wnt3a also protected AML12 cells from damages caused by H/R, showing enhanced proliferation activity. Notably, knockdown of beta-catenin in hepatocytes completely abolished the effect of Rspo3 pretreatment on the expression levels of PCNA and CyclinDl.& para;& para;Conclusion: Rspo3-LGR4 axis protects hepatocytes from H/R injury via activating beta-catenin. (C) 2018 Published by Elsevier Inc.
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