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• W2980486541 abstract "Abstract Background Cannabinoid receptor 1 (CB1R) is a GPCR expressed widely in the brain as well as in peripheral metabolic organs. Although pharmacological blockade of CB1R has been effective for the treatment of obesity and tobacco addiction, precise distribution of CB1R within the brain and potential changes by obesity or nicotine exposure have not been thoroughly addressed. Methods To examine CB1R distribution within the central energy center, we performed immunostaining and qPCR analysis of micro-dissected hypothalamic nuclei from male C57BL/6 mice. To address the effect of nicotine on food intake and body weight, and on potential changes of CB1R levels in the hypothalamus, mice kept on a high fat diet (HFD) for four weeks were challenged with nicotine intraperitoneally. Results Validity of the micro-dissected samples was confirmed by the expression of established nucleus-enriched genes. The expression levels of CB1R in the arcuate and lateral nuclei of the hypothalamus were higher than paraventricular and ventral-dorsal medial nuclei. Nicotine administration led to a significant suppression of food intake and body weight either under standard or high fat diet. Neither HFD nor nicotine alone altered CB1R levels in any nucleus tested. By contrast, treatment of HFD-fed mice with nicotine led to a significant increase in CB1R levels in the arcuate, paraventricular and lateral nuclei. Conclusions CB1R was widely distributed in multiple hypothalamic nuclei. The expression of CB1R was augmented only when mice were treated with HFD and nicotine in combination. These data suggest that the exposure to nicotine may provoke an enhanced endocannabinoid response in diet-induced obesity." @default.
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• W2980486541 date "2020-01-01" @default.
• W2980486541 modified "2023-10-14" @default.
• W2980486541 title "A combination of dietary fat intake and nicotine exposure enhances CB1 endocannabinoid receptor expression in hypothalamic nuclei in male mice" @default.
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• W2980486541 doi "https://doi.org/10.1016/j.neulet.2019.134550" @default.
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