RT Journal Article
SR Electronic
T1 A Peripheral Mechanism for CB1 Cannabinoid Receptor-Dependent Modulation of Feeding
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 9612
OP 9617
DO 10.1523/JNEUROSCI.22-21-09612.2002
VO 22
IS 21
A1 Gómez, Raquel
A1 Navarro, Miguel
A1 Ferrer, Belén
A1 Trigo, José M.
A1 Bilbao, Ainhoa
A1 Del Arco, Ignacio
A1 Cippitelli, Andrea
A1 Nava, Felice
A1 Piomelli, Daniele
A1 Rodrı́guez de Fonseca, Fernando
YR 2002
UL http://www.jneurosci.org/content/22/21/9612.abstract
AB Recent studies suggest that the endocannabinoid system modulates feeding. Despite the existence of central mechanisms for the regulation of food intake by endocannabinoids, evidence indicates that peripheral mechanisms may also exist. To test this hypothesis, we investigated (1) the effects of feeding on intestinal anandamide accumulation; (2) the effects of central (intracerebroventricular) and peripheral (intraperitoneal) administration of the endocannabinoid agonist anandamide, the synthetic cannabinoid agonistR-(+)-(2,3-dihydro-5-methyl-3-[(4-morpholinyl)methyl]pyrol[1,2,3-de]-1,4-benzoxazin-6-yl)(1-naphthalenyl) methanone monomethanesulfonate (WIN55,212-2), and the CB1-selective antagonistN-piperidino-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methylpyrazole-3-carboxamide (SR141716A) on food intake in rats; and (3) the effects of sensory deafferentation on the modulation of feeding by cannabinoids. Food deprivation produced a sevenfold increase in anandamide content in the small intestine but not in the brain or stomach. Refeeding normalized intestinal anandamide levels. Peripheral but not central administration of anandamide or WIN55,212-2 promoted hyperphagia in partially satiated rats. Similarly, peripheral but not central administration of SR141716A reduced food intake. Capsaicin deafferentation abolished the peripheral effects of both cannabinoid agonists and antagonists, suggesting that these agents modulate food intake by acting on CB1 receptors located on capsaicin-sensitive sensory terminals. Oleoylethanolamide, a noncannabinoid fatty ethanolamide that acts peripherally, prevented hyperphagia induced by the endogenous cannabinoid anandamide. Pretreatment with SR141716A enhanced the inhibition of feeding induced by intraperitoneal administration of oleoylethanolamide. The results reveal an unexpected role for peripheral CB1 receptors in the regulation of feeding.