Hypoxia training improves hepatic steatosis partly by downregulation of CB1 receptor in obese mice.
Biochem Biophys Res Commun
; 525(3): 639-645, 2020 05 07.
Article
em En
| MEDLINE
| ID: mdl-32122652
ABSTRACT
Hypoxia training (HT) can reduce body weight and improve fatty liver. However, the mechanism is not clear. A previous study indicated that HT-induced weight loss might be associated with the endocannabinoid system (ECS), which has also been reported recently to be involved in the persistent lipid mediators after weight loss. The present study investigated the effects of HT, a new prospective weight-loss method, on nutritionally obese mice and demonstrated that HT significantly reduced body weight, fat mass, transcriptional expression of liver endocannabinoid receptor 1 (CB1), biosynthetic enzyme diacylglycerol lipase α (DAGLα) and improved the transcriptional expression of degrading enzyme monoacylglycerol lipase (MAGL). Liver endocannabinoids 2-arachidonoylglycerol (2-AG) but not anandamide (AEA) was evidently decreased in response to HT. Simultaneously, HT significantly reduced liver index, serum alanine aminotransferase (ALT) and liver fat contents. Western blot showed decreased expression of liver CB1, sterol regulatory element-binding protein-1 (SREBP-1), peroxisome proliferator-activated receptor γ (PPARγ) and increased expression of adipose triglyceride lipase (ATGL) and carnitine palmitoyltransferase-1 (CPT-1) levels after HT. However, intraperitoneal injection of CB1 receptor agonist WIN55212-2 offset the benefits by which HT reduced hepatic fat synthesis, with significant increased protein expression of SREBP-1 and PPARγ. Taken together, these findings reported the alleviation of obesity and hepatic steatosis through HT and provided a putative molecular mechanism by inhibiting the CB1-mediated fat synthesis.
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Texto completo:
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Regulação para Baixo
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Receptor CB1 de Canabinoide
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Fígado Gorduroso
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Hipóxia
Limite:
Animals
Idioma:
En
Revista:
Biochem Biophys Res Commun
Ano de publicação:
2020
Tipo de documento:
Article