Aller au contenuAller au menuAller à la recherche

Giovanni Marsicano et al. dans Nature Neuroscience

Comment le système "endocannabinoïde" contrôle la prise alimentaire en agissant sur la perception des odeurs.

Le 13 février 2014

The endocannabinoid system controls food intake via olfactory processes.  (PubMed)
Soria-Gómez E, Bellocchio L, Reguero L, Lepousez G, Martin C, Bendahmane M, Ruehle S, Remmers F, Desprez T, Matias I, Wiesner T, Cannich A, Nissant A, Wadleigh A, Pape HC, Chiarlone AP, Quarta C, Verrier D, Vincent P, Massa F, Lutz B, Guzmán M, Gurden H, Ferreira G, Lledo PM, Grandes P, Marsicano G. Nat Neurosci. 2014 Feb 9. doi: 10.1038/nn.3647. [Epub ahead of print]

dans Nature Neuroscience....




Les chercheurs ont découvert que les récepteurs au cannabinoïdes contrôlent un circuit reliant le bulbe olfactif (première région du système nerveux à traiter l’information olfactive, situé au-dessus du nez) et le cortex olfactif (structures supérieures du cerveau qui traitement l'information). Quand la sensation de faim est ressentie, elle déclenche l’activité de ces récepteurs qui activent à leur tour le circuit olfactif devenant plus réactif. (Sciences et Avenir)

Mechanism elucidated: how smell perception influences food intake
A research team led by Giovanni Marsicano, a Inserm Research Director at Unit 862 (NeuroCentre Magendie, Bordeaux), has succeeded in elucidating how the endocannabinoid system controls food intake through its effects on the perception of smells. These results are due to appear in the journal Nature Neuroscience on 9 February 2014. 

In animals, as in humans, hunger mechanisms are known to stimulate food intake. Hunger triggers a set of mechanisms that encourage feeding, for example by increasing sensory perceptions such as the sense of smell. The researchers have now succeeded in revealing what links hunger and increased smell perception in the brain, and the resulting urge to eat. The researchers have discovered how this mechanism is initiated in the endocannabinoid system in mice.
This system interconnects receptors located in the brain and involved in different sensations such as euphoria, anxiety, or even pain, that are also sensitive to cannabinoid substances, such as cannabis. The researchers discovered that the CB1 cannabinoid receptors control a circuit that connects the olfactory bulb (the region in the nervous system that initially handles olfactory information, located above the nose) to the olfactory cortex (higher structures of the brain). When the sensation of hunger is felt, it triggers the activity of the cannabinoid receptors, which in turn activate the olfactory circuit, which then becomes more responsive.

It is therefore this biological mechanism that brings about the increased sensitivity to smell during hunger, explaining one of the reasons for food intake and attraction to food. The researchers expect that the circuit involved in the olfactory system is altered in obese or anorexic patients, and that sensitivity to smell may be more or less strong compared to normal. Elucidation of the biological mechanism will allow better management of these types of pathologies.
This work was funded by ERC (European Research Council).

Below  , an illustration of  Charlie Padgett, Creative Director, Illustrator, Chief Robot at The 3feet Factory,  more..


 

Contact



Giovanni Marsicano

Directeur de recherche Inserm
NeuroCentre Magendie de Bordeaux – Unité Inserm 862
giovanni.marsicano@inserm.fr
+33 (0)5 57 57 37 56


Team: Endocannabinoids and neuroadaptation