Chronic AMP-kinase activation with AICAR reduces adiposity by remodeling adipocyte metabolism and increasing leptin sensitivity
| Autor: | Andrea Frontini, Saverio Cinti, Steven Hung, Kathryn E. Pistor, Mandeep Pinky Gaidhu, Rolando B. Ceddia |
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| Rok vydání: | 2011 |
| Předmět: |
Leptin
Male medicine.medical_specialty Hypothalamus Palmitates White adipose tissue QD415-436 Biology Biochemistry beta-oxidation chemistry.chemical_compound Eating Endocrinology Adipocyte Internal medicine medicine Adipocytes Animals Hypoglycemic Agents SOCS3 Rats Wistar Beta oxidation Research Articles Adiposity Adenylate Kinase Body Weight AMPK 5-aminoimidazole-4-carboxamide-1-β-D-ribofuranoside Cell Biology Ribonucleotides Aminoimidazole Carboxamide protein kinases/AMP-activated protein kinase Mitochondria Rats Enzyme Activation chemistry Adipose Tissue Anorectic Energy Metabolism Homeostasis fatty acid/oxidation |
| Zdroj: | Journal of Lipid Research, Vol 52, Iss 9, Pp 1702-1711 (2011) |
| ISSN: | 1539-7262 |
| Popis: | This study investigated the effect of chronic AMP-kinase (AMPK) activation with 5-aminoimidazole-4-carboxamide-1-β-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. |
| Databáze: | OpenAIRE |
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