期刊
GUT
卷 70, 期 12, 页码 2359-2372出版社
BMJ PUBLISHING GROUP
DOI: 10.1136/gutjnl-2020-321767
关键词
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资金
- FEDER funds through the COMPETE programme
- Fundacao para a Ciencia e a Tecnologia [SAICTPAC/0019/2015-LISBOA-01-0145--FEDER-016405, PTDC/MED-FAR/29097/2017 -LISBOA-01-0145-FEDER-029097]
- Fondation pour la Recherche Medicale [ARF20170938613]
- Institute of Cardiometabolism and Nutrition [PAP17NECJG]
- Societe Francophone du Diabete [R19114DD]
- Mairie de Paris [Emergences - R18139DD]
- Fundacao para a Ciencia e a Tecnologia
- research grant APEF (Portuguese Association for the Study of Liver)/BAYER 2020
This study shows that RIPK3 is associated with the severity of NAFLD in patients and mice, playing a crucial role in managing liver metabolism, damage, inflammation, fibrosis, and carcinogenesis. RIPK3 deficiency can improve inflammation and fibrosis, and reduce tumor formation. Additionally, RIPK3 deficiency leads to weight gain but alters hepatic lipid profiles.
Objective Receptor-interacting protein kinase 3 (RIPK3) is a key player in necroptosis execution and an emerging metabolic regulator, whose contribution to non-alcoholic fatty liver disease (NAFLD) is controversial. We aimed to clarify the impact of RIPK3 signalling in the pathogenesis of human and experimental NAFLD. Design RIPK3 levels were evaluated in two large independent cohorts of patients with biopsy proven NAFLD diagnosis and correlated with clinical and biochemical parameters. Wild-type (WT) or Ripk3-deficient (Ripk3(-/-)) mice were fed a choline-deficient L-amino acid-defined diet (CDAA) or an isocaloric control diet for 32 and 66 weeks. Results RIPK3 increased in patients with non-alcoholic steatohepatitis (NASH) in both cohorts, correlating with hepatic inflammation and fibrosis. Accordingly, Ripk3 deficiency ameliorated CDAA-induced inflammation and fibrosis in mice at both 32 and 66 weeks. WT mice on the CDAA diet for 66 weeks developed preneoplastic nodules and displayed increased hepatocellular proliferation, which were reduced in Ripk3(-/-) mice. Furthermore, Ripk3 deficiency hampered tumourigenesis. Intriguingly, Ripk3(-/-) mice displayed increased body weight gain, while lipidomics showed that deletion of Ripk3 shifted hepatic lipid profiles. Peroxisome proliferator-activated receptor. (PPAR.) was increased in Ripk3(-/-) mice and negatively correlated with hepatic RIPK3 in patients with NAFLD. Mechanistic studies established a functional link between RIPK3 and PPAR. in controlling fat deposition and fibrosis. Conclusion Hepatic RIPK3 correlates with NAFLD severity in humans and mice, playing a key role in managing liver metabolism, damage, inflammation, fibrosis and carcinogenesis. Targeting RIPK3 and its intricate signalling arises as a novel promising approach to treat NASH and arrest disease progression.
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