Obesity (Silver Spring, Md.) 2019-Mar
Diet-Induced Obesity in Cannabinoid-2 Receptor Knockout Mice and Cannabinoid Receptor 1/2 Double-Knockout Mice.
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METHODS
A high-fat diet was used to study metabolic changes in male mice lacking CB2R (CB2-/- ) or lacking both CB1R and CB2R (double-knockout [CB-DKO]) compared with wild-type mice.RESULTS
When CB2-/- mice were maintained on a high-fat diet, their weight gain was not different from wild-type mice (gaining 19 and 21 g, respectively), whereas CB-DKO mice gained only 5 g. There were no significant differences in food intake or locomotor activity between the three groups. Respiratory exchange rate and heat production were elevated in CB-DKO mice, with upregulation of adipose tissue thermogenic genes. Glucose tolerance test and insulin levels indicated increased insulin sensitivity in CB-DKO mice, whereas CB2-/- displayed signs of impaired glucose clearance.