Fiche publication
Date publication
février 2015
Journal
Journal of lipid research
Auteurs
Membres identifiés du Cancéropôle Est :
Pr BERNARD Alain
Tous les auteurs :
Ancel D, Bernard A, Subramaniam S, Hirasawa A, Tsujimoto G, Hashimoto T, Passilly-Degrace P, Khan NA, Besnard P
Lien Pubmed
Résumé
Implication of the long-chain fatty acid (LCFA) receptor GPR120, also termed free fatty acid receptor 4, in the taste-guided preference for lipids is a matter of debate. To further unravel the role of GPR120 in the "taste of fat", the present study was conducted on GPR120-null mice and their wild-type littermates. Using a combination of morphological [i.e., immunohistochemical staining of circumvallate papillae (CVP)], behavioral (i.e., two-bottle preference tests, licking tests and conditioned taste aversion) and functional studies [i.e., calcium imaging in freshly isolated taste bud cells (TBCs)], we show that absence of GPR120 in the oral cavity was not associated with changes in i) gross anatomy of CVP, ii) LCFA-mediated increases in intracellular calcium levels ([Ca(2+)]i), iii) preference for oily and LCFA solutions and iv) conditioned avoidance of LCFA solutions. In contrast, the rise in [Ca(2+)]i triggered by grifolic acid, a specific GPR120 agonist, was dramatically curtailed when the GPR120 gene was lacking. Taken together, these data demonstrate that activation of lingual GPR120 and preference for fat are not connected, suggesting that GPR120 expressed in TBCs is not absolutely required for oral fat detection in mice.
Mots clés
Animals, Calcium, metabolism, Dietary Fats, metabolism, Food Preferences, drug effects, Immunohistochemistry, Male, Mice, Receptors, G-Protein-Coupled, agonists, Taste Buds, cytology
Référence
J. Lipid Res.. 2015 Feb;56(2):369-78
