کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6260019 | 1290015 | 2011 | 7 صفحه PDF | دانلود رایگان |
This study investigates the molecular mechanisms and the center-periphery cross talk underlying the anti-obesity effect of the cannabinoid receptor 1 (CB1) antagonist/inverse agonist rimonabant in diet-induced obese (DIO) mice exposed to a 31 days chronic treatment with the drug. Present data showed a significant and stable weight loss both in animals treated with rimonabant 10Â mg/kg by oral gavage exposed to a high fat diet (SRFD) and in vehicle treated mice switched to a regular chow (VEND) with respect to vehicle fat diet fed mice (VEFD). Caloric intake was significantly lowered in SRFD and VEND during the first two and four days, respectively, then reaching the VEFD consume throughout the treatment. The drop of body weight was accompanied by leptin mRNA decrease in visceral fat tissue both in VEND and SRFD, as revealed by Real time PCR analysis. No difference in CB1 mRNA receptor expression in hypothalamus and in visceral fat tissue among groups was observed. Leptin receptors were decreased in the hypothalamus of SRFD but not of VEND mice. Moreover, in SRFD and VEND mice the expression of orexigenic genes Neuropeptide Y and Agouti Related Protein (AGRP) was increased, while anorexigenic ones, Pro-OpioMelanoCortin (POMC) and Cocaine-and-Amphetamine-Regulated Transcript (CART) displayed no alteration in any group. This data contribute to clarify the molecular basis of the anti-obesity properties of rimonabant, underlying the role of the peripheral modulators which affect central circuits involved in the regulation of food intake and energy homeostasis.
Research highlightsⶠRimonabant 10 mg/kg produced a significant and stable weight loss in DIO mice. ⶠLeptin mRNA was decreased in visceral fat tissue both in vehicle normal diet and rimonabant fat diet. ⶠLeptin receptor mRNA was decreased in the hypothalamus of DIO mice treated with rimonabant. ⶠNPY and AGRP mRNA were increased in DIO mice treated with rimonabant. ⶠPOMC and CART mRNA displayed no alteration in any sperimental group. ⶠRimonabant regulates the complex feedback between CNS and periphery in energy homeostasis.
Journal: Behavioural Brain Research - Volume 217, Issue 2, 1 March 2011, Pages 432-438