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Hypothalamic CB1 cannabinoid receptors regulate energy balance in mice
Pierre Cardinal1, Luigi Bellocchio, Samantha Clark
1Group Energy Balance and Obesity, Institut National de la Santé et de la Recherche Médicale, Unité 862, Neurocentre Magendie, 146 Rue Léo Saignat, F-33077 Bordeaux, France.
Endocrinology
|July 11, 2012
Summary
Deleting the cannabinoid type 1 (CB(1)) receptor in the hypothalamus reduces body weight gain by increasing energy expenditure. Hypothalamic CB(1) signaling is crucial for leptin and CB(1) antagonist effects on food intake.
Area of Science:
- Neuroscience
- Metabolism
- Endocrinology
Background:
- Cannabinoid type 1 (CB(1)) receptor activation stimulates appetite.
- The hypothalamus regulates energy balance, influencing food intake and expenditure.
- The precise role of hypothalamic CB(1) signaling in energy balance remains unclear.
Purpose of the Study:
- To investigate the role of hypothalamic CB(1) receptors in regulating energy balance.
- To determine the impact of deleting hypothalamic CB(1) receptors on body weight, food intake, and energy expenditure.
Main Methods:
- Generated adult mice with hypothalamic deletion of the CB(1) receptor gene (Hyp-CB(1)-KO) using adeno-associated viral vectors.
- Assessed body weight, food intake, and energy expenditure in Hyp-CB(1)-KO mice on a standard diet.
- Measured mRNA levels of key metabolic and adrenergic receptors in brown adipose tissue.
- Evaluated responses to leptin and the CB(1) inverse agonist rimonabant.
Main Results:
- Hyp-CB(1)-KO mice exhibited reduced body weight gain, increased energy expenditure, and elevated thermogenic markers (β(3)-adrenergic receptor, uncoupling protein-1) in brown adipose tissue.
- Food intake was not significantly altered under basal conditions.
- Hyp-CB(1)-KO mice showed leptin insensitivity and a hypophagic response to rimonabant.
Conclusions:
- Hypothalamic CB(1) receptor signaling is essential for regulating energy expenditure under basal conditions.
- Hypothalamic CB(1) receptors mediate the effects of leptin and CB(1) receptor antagonists on food intake.
- Targeting hypothalamic CB(1) receptors offers potential therapeutic strategies for obesity and metabolic disorders.
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