2014 Aug 25. pii: fj.13-247643. [Epub ahead of print]
Peripheral cannabinoid 1 receptor blockade activates brown adipose tissue and diminishes dyslipidemia and obesity.
Boon MR1, Kooijman S2, van Dam AD2, Pelgrom LR2, Berbée JF2, Visseren CA2, van Aggele RC2, van den Hoek AM3, Sips HC2, Lombès M4, Havekes LM5, Tamsma JT6, Guigas B7, Meijer OC2, Jukema JW6,Rensen PC2.
Abstract
The endocannabinoid system is an important player in energy metabolism by regulating appetite, lipolysis, and energy expenditure. Chronic blockade of the cannabinoid 1 receptor (CB1R) leads to long-term maintenance of weight loss and reduction of dyslipidemia in experimental and human obesity. The molecular mechanism by which CB1R blockade reverses dyslipidemia in obesity has not yet been clarified. In this study, we showed that CB1R blockade with the systemic CB1R blocker rimonabant enhanced whole-body energy expenditure and activated brown adipose tissue (BAT), indicated by increased expression of genes involved in BAT thermogenesis and decreased lipid droplet size in BAT. This was accompanied by selectively increased triglyceride (TG) uptake by BAT and lower plasma TG levels. Interestingly, the effects on BAT activation were still present at thermoneutrality and could be recapitulated by using the strictly peripheral CB1R antagonist AM6545, indicating direct peripheral activation of BAT. Indeed, CB1R blockade directly activated T37i brown adipocytes, resulting in enhanced uncoupled respiration, most likely via enhancing cAMP/PKA signaling via the adrenergic receptor pathway. Our data indicate that selective targeting of the peripheral CB1R in BAT has therapeutic potential in attenuating dyslipidemia and obesity.-Boon, M. R., Kooijman, S., van Dam, A. D., Pelgrom, L. R., Berbée, J. F. P., Visseren, C. A. R., van Aggele, R. C., van den Hoek, A. M., Sips, H. C. M., Lombès, M., Havekes, L. M., Tamsma, J. T., Guigas, B., Meijer, O. C., Jukema, J. W., Rensen, P. C. N. Peripheral cannabinoid 1 receptor blockade activates brown adipose tissue and diminishes dyslipidemia and obesity.
© FASEB.
© FASEB.
KEYWORDS:
rimonabant; sympathetic nervous system; uncoupling protein 1
- PMID:
- 25154875
- [PubMed – as supplied by publisher]
