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Effects of RVD-hemopressin (alpha) on feeding and body weight after standard or cafeteria diet in rats
Palatability and variety of foods are major reasons for hedonic eating, and hence for obesity. Hemopressin, a hemoglobin alpha chain-derived peptide, plays antagonist/inverse agonist role on cannabinoid (CB)1 receptors, while RVD-hemopressin(alpha)[RVD-hp(alpha)], a N-terminally extended form of hemopressin, has been reported as an allosteric modulator of CB1 and CB2 receptors. We investigated the effects of 14 daily intraperitoneal injections of RVD-hp(alpha), in Sprague-Dawley rats fed a highly palatable cafeteria-style (CAF) diet (30% fat, 56% carbohydrate, 14% protein; 4.20 kcal/g) compared to standard laboratory chow (STD) food (3.5% fat, 63% carbohydrate, 14% protein, 19.5% other components without caloric value; 3.20 kcal). Food intake, body weight and locomotor activity were recorded throughout the study. Finally, rats were sacrificed and agouti-related peptide (AgRP), neuropeptide Y (NPY), pro-opiomelanocortin (POMC) and cocaine and amphetamine-regulated transcript (CART) and fatty acid amide hydrolase (FAAH) gene expression in the hypothalamus was measured by real-time reverse transcription polymerase chain reaction. We found that CAF diet increased food intake as compared to STD diet. In both STD and CAF diet fed rats, RVD-hp(alpha) treatment inhibited food intake, increased locomotor activity but did not modify body weight. In vehicle injected animals, CAF as compared to STD diet increased AgRP gene expression. RVD-hp(alpha) treatment decreased POMC mRNA levels in both diet groups and lowered the elevated AgRP levels induced by CAF diet. RVD-hp(alpha) treatment plays an anorexigenic role paralleled by increased locomotor activity both in STD and CAF diet fed rats. The inhibition of feeding could be partially mediated by lowering of hypothalamic POMC and AgRP gene expression levels.
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