Resolvin D1 reduces ER stress-induced apoptosis and triglyceride accumulation through JNK pathway in HepG2 cells

Tae Woo Jung, Hwan Jin Hwang, Ho Cheol Hong, Hae Yoon Choi, Hye Jin Yoo, Sei-Hyun Baik, Kyung Mook Choi

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Research has indicated that stress on the endoplasmic reticulum (ER) of a cell affects the pathogenesis of metabolic disorders such as obesity, type 2 diabetes mellitus, and non-alcoholic fatty liver disease (NAFLD). Resolvins, a novel family derived from ω-3 polyunsaturated fatty acids, have anti-inflammatory and insulin sensitizing properties, and it has been suggested that they play a role in the amelioration of obesity-related metabolic dysfunctions. This study showed that pretreatment with resolvin D1 (RvD1) attenuated ER stress-induced apoptosis and also decreased caspase 3 activity in HepG2 cells. Furthermore, RvD1 significantly decreased tunicamycin-induced triglycerides accumulation as well as SREBP-1 expression. However, tunicamycin-induced ER stress markers were not significantly affected by RvD1 treatment. Moreover, RvD1 treatment did not affect the tunicamycin-induced expression of chaperones that assist protein folding in the ER. These results suggest that RvD1-conferred cellular protection may occur downstream of the ER stress. This was supported by the finding that RvD1 significantly inhibited tunicamycin-induced c-Jun N-terminal kinase (JNK) expression, although P38 and ERK1/2 phosphorylation were not affected. In addition, anisomycin, a JNK activator, increased caspase 3 activity and apoptosis as well as triglycerides accumulation and SREBP1 expression, and RvD1 treatment reversed these changes. In conclusion, RvD1 attenuated ER stress-induced hepatic steatosis and apoptosis via the JNK-mediated pathway. This study may provide insight into a novel underlying mechanism and a strategy for treating NAFLD.

Original languageEnglish
Pages (from-to)30-40
Number of pages11
JournalMolecular and Cellular Endocrinology
Volume391
Issue number1-2
DOIs
Publication statusPublished - 2014 Jun 25

Keywords

  • C-Jun N-terminal kinase
  • ER stress
  • Non-alcoholic fatty liver
  • Proliferator-activated receptor-γ
  • Resolvin D1

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Endocrinology

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