Cannabinoids act at two classical cannabinoid receptors (CB1 and CB2), a 7TM orphan receptor and the transmitter‐gated channel transient receptor potential vanilloid type‐1 receptor. Recent evidence also points to cannabinoids acting at members of the nuclear receptor family, peroxisome proliferator‐activated receptors (PPARs, with three subtypes α, β (δ) and γ), which regulate cell differentiation and lipid metabolism. Much evidence now suggests that endocannabinoids are natural activators of PPARα. Oleoylethanolamide regulates feeding and body weight, stimulates fat utilization and has neuroprotective effects mediated through activation of PPARα. Similarly, palmitoylethanolamide regulates feeding and lipid metabolism and has anti‐inflammatory properties mediated by PPARα. Other endocannabinoids that activate PPARα include anandamide, virodhamine and noladin. Some (but not all) endocannabinoids also activate PPARγ; anandamide and 2‐arachidonoylglycerol have anti‐inflammatory properties mediated by PPARγ. Similarly, ajulemic acid, a structural analogue of a metabolite of Δ9‐tetrahydrocannabinol (THC), causes anti‐inflammatory effects in vivo through PPARγ. THC also activates PPARγ, leading to a time‐dependent vasorelaxation in isolated arteries. Other cannabinoids which activate PPARγ include N‐arachidonoyl‐dopamine, HU210, WIN55212‐2 and CP55940. In contrast, little research has been carried out on the effects of cannabinoids at PPARδ. In this newly emerging area, a number of research questions remain unanswered; for example, why do cannabinoids activate some isoforms and not others? How much of the chronic effects of cannabinoids are through activation of nuclear receptors? And importantly, do cannabinoids confer the same neuro‐ and cardioprotective benefits as other PPARα and PPARγ agonists? This review will summarize the published literature implicating cannabinoid‐mediated PPAR effects and discuss the implications thereof. British Journal of Pharmacology (2007) 152, 576–582; doi:10.1038/sj.bjp.0707423; published online 20 August 2007
British Journal of Pharmacology – Wiley
Published: Nov 1, 2007
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