期刊
JOURNAL OF LIPID RESEARCH
卷 52, 期 9, 页码 1702-1711出版社
ELSEVIER
DOI: 10.1194/jlr.M015354
关键词
adipocytes; beta-oxidation; fatty acid/oxidation; mitochondria; protein kinases/AMP-activated protein kinase; 5-aminoimidazole-4-carboxamide-1-beta-D-ribofuranoside
资金
- Canadian Institute of Health Research [CIHR MOP-86538]
- Canada Foundation for Innovation (CFI)
- Ontario Research Fund (ORF)
- Ontario Ministry of Research and Innovation
- Universita Politecnica delle Marche
- Canadian Diabetes Association (CDA)
- Italian foundation for Research and Development (Fondazione Cariverona)
This study investigated the effect of chronic AMP-kinase (AMPK) activation with 5-aminoimidazole-4-carboxamide-1-beta-D-ribofuranoside (AICAR) on white adipose tissue (WAT) metabolism and the implications for visceral (VC) and subcutaneous (SC) adiposity, whole body-energy homeostasis, and hypothalamic leptin sensitivity. Male Wistar rats received daily single intraperitoneal injections of either saline or AICAR (0.7g/kg body weight) for 4 and 8 weeks and were pair-fed throughout the study. AICAR-treated rats had reduced adiposity with increased mitochondrial density in VC and SC fat pads, which was accompanied by reduced circulating leptin and time-dependent and depot-specific regulation of AMPK phosphorylation and FA oxidation. Interestingly, the anorectic effect to exogenous leptin was more pronounced in AICAR-treated animals than controls. This corresponded to reductions in hypothalamic AMPK phosphorylation and suppressor of cytokine signaling 3 content, whereas signal transducer and activator of transcription 3 phosphorylation was either unchanged or increased at 4 and 8 weeks in AICAR-treated rats. Ambulatory activity and whole-body energy expenditure (EE) were also increased with AICAR treatment. Altogether, chronic AICAR-induced AMPK activation increased WAT oxidative machinery, whole-body EE, and hypothalamic leptin sensitivity. This led to significant reductions in VC and SC adiposity without inducing energy-sparing mechanisms that oppose long-term fat loss.-Gaidhu, M. P., A. Frontini, S. Hung, K. Pistor, S. Cinti, and R. B. Ceddia. Chronic AMP-kinase activation with AICAR reduces adiposity by remodeling adipocyte metabolism and increasing leptin sensitivity. J. Lipid Res. 2011. 52: 1702-1711.
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