Abstract
Endocannabinoids are a group of arachidonic acid-derived lipid mediators binding to
cannabinoid receptors CB1 and CB2. An overactivity of the endocannabinoid system plays
a pathophysiological role in the development of visceral obesity and insulin resistance.
Moreover, elevated circulating endocannabinoid levels are also prevalent in atherosclerosis.
The pathophysiological increase of endocannabinoid levels is due to an altered expression
of endocannabinoid synthesizing and degrading enzymes induced by inflammatory mediators
such as cytokines or lipids. Emerging experimental evidence suggests that enhanced
endocannabinoid signalling affects atherosclerosis via multiple effects, including
a modulation of vascular inflammation, leukocyte recruitment, macrophage cholesterol
metabolism and consequently atherosclerotic plaque stability. In addition, recent
findings in various metabolic disease models highlight the relevance of peripheral
CB1 cannabinoid receptors in adipose tissue, liver and pancreas, which crucially regulate
lipid and glucose metabolism as well as macrophage properties in these organs. This
suggests that targeting the endocannabinoid system in the vasculature and peripheral
organs might have a therapeutic potential for atherosclerosis by inhibiting vascular
inflammation and improving metabolic risk factors. This review will provide a brief
update on the effects of endocannabinoid signalling in atherosclerosis and related
metabolic complications.
Keywords
atherosclerosis - inflammation - lipid mediators - metabolic disorders - obesity