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ERK1/2 activation in human taste bud cells regulates fatty acid signaling and gustatory perception of fat in mice and humans
Abstract : Obesity is a major public health problem. An in-depth knowledge of the molecular mechanisms of oro-sensory detection of dietary lipids may help fight it. Humans and rodents can detect fatty acids via lipido-receptors, such as CD36 and GPR120. We studied the implication of the MAPK pathways, in particular, ERK1/2, in the gustatory detection of fatty acids. Linoleic acid, a dietary fatty acid, induced via CD36 the phosphorylation of MEK1/2-ERK1/2-ETS-like transcription factor-1 cascade, which requires Fyn-Src kinase and lipid rafts in human taste bud cells (TBCs). ERK1/2 cascade was activated by Ca2+ signaling via opening of the calcium-homeostasis modulator-1 (CALHM1) channel. Furthermore, fatty acid-evoked Ca2+ signaling and ERK1/2 phosphorylation were decreased in both human TBCs after small interfering RNA knockdown of CALHM1 channel and in TBCs from Calhm1(-/-) mice. Targeted knockdown of ERK1/2 by small interfering RNA or PD0325901 (MEK1/2 inhibitor) in the tongue and genetic ablation of Erk1 or Calhm1 genes impaired preference for dietary fat in mice. Lingual inhibition of ERK1/2 in healthy volunteers also decreased orogustatory sensitivity for linoleic acid. Our data demonstrate that ERK1/2-MAPK cascade is regulated by the opening of CALHM1 Ca2+ channel in TBCs to modulate orogustatory detection of dietary lipids in mice and humans.
https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01407594
Contributeur : Lnc - Université de Bourgogne Connectez-vous pour contacter le contributeur
Soumis le : vendredi 2 décembre 2016 - 12:36:27
Dernière modification le : jeudi 19 novembre 2020 - 15:02:49
Contributeur : Lnc - Université de Bourgogne Connectez-vous pour contacter le contributeur
Soumis le : vendredi 2 décembre 2016 - 12:36:27
Dernière modification le : jeudi 19 novembre 2020 - 15:02:49
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