期刊
FASEB JOURNAL
卷 31, 期 12, 页码 5384-+出版社
FEDERATION AMER SOC EXP BIOL
DOI: 10.1096/fj.201700394R
关键词
NAFLD; UPR; miRNA; liver cells
资金
- Spanish Ministerio de Economia y Competitividad (MEC) under European Regional Development Funds [SAF15-63674-R, PIE14/00045]
- Instituto de Salud Carlos III
- MEC [BES-2013-063705]
- Agaur/BFU (FI-DGR)
- Marie Curie Action
Endoplasmic reticulum(ER) stress and activation of the unfolded protein response (UPR) are hallmarks of nonalcoholic fatty liver disease (NAFLD), which is the hepatic manifestation of the metabolic syndrome associated with obesity. The specialized proresolving lipid mediator maresin 1 (MaR1) preserves tissue homeostasis by exerting cytoprotective actions, dampening inflammation, and expediting its timely resolution. Here, we explored whether MaR1 protects liver cells from lipotoxic and hypoxia-induced ER stress. Mice were rendered obese by high fat diet feeding, and experiments were performed in primary hepatocytes, Kupffer cells, and precision-cut liver slices (PCLSs). Palmitate-induced lipotoxicity increased ER stress and altered autophagy in hepatocytes, effects that were prevented by MaR1. MaR1 protected hepatocytes against lipotoxicity-induced apoptosis by activating the UPR prosurvival mechanisms and preventing the excessive up-regulation of proapoptotic pathways. Protective MaR1 effects were also seen in hepatocytes challenged with hypoxia and TNF-alpha-induced cell death. High-throughput microRNA (miRNA) sequencing revealed that MaR1 actions were associated with specific miRNA signatures targeting both protein folding and apoptosis. MaR1 also prevented lipotoxic-triggered ER stress and hypoxia-induced inflammation in PCLSs and enhanced Kupffer cell phagocytic capacity. Together, these findings describe the ability of MaR1 to oppose ER stress in liver cells under conditions frequently encountered in NAFLD.
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