Role of the endocannabinoid system in food intake, energy homeostasis and regulation of the endocrine pancreas.
paper
Cited
Public
Unavailable
- Authors
- Li, Chen; Jones, Peter M; Persaud, Shanta J
- Year
- 2011
- Journal
- Pharmacology & therapeutics
- PMID
- 21055418
- DOI
- 10.1016/j.pharmthera.2010.10.006
The endocannabinoid system (ECS) is a signalling cascade consisting of CB1 and CB2 receptors, and enzymes for the synthesis and degradation of endogenous ligands for these receptors. Central CB1 receptors have been most widely studied since they play key roles in energy homeostasis and rimonabant, a CB1 receptor antagonist, was used clinically to treat obesity. Less is known about CB2 receptors, but their abundant expression by lymphocytes and macrophages has led to suggestions of their importance in immune and inflammatory reactions. More recently, it has become apparent that both CB1 and CB2 receptors are more widely expressed than originally thought, and the capacity of endocannabinoids to regulate energy balance also occurs through their interactions with cannabinoid receptors on a variety of peripheral tissues. In general, pathological overactivation of the ECS contributes to weight gain, reduced sensitivity to insulin and glucose intolerance, and blockade of CB1 receptors reduces body weight through increased secretion of anorectic signals and improved insulin sensitivity. However, the notion that the ECS per se is detrimental to energy homeostasis is an oversimplification, since activation of cannabinoid receptors expressed by islet cells can stimulate insulin secretion, which is obviously beneficial under conditions of impaired glucose tolerance or type 2 diabetes. We propose that under normal physiological conditions cannabinoid signalling in the endocrine pancreas is a bona fide mechanism of regulating insulin secretion to maintain blood glucose levels, but that energy balance becomes dysregulated with excessive food intake, leading to adipogenesis and fat accumulation through enhanced cannabinoid synthesis.
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