Background & aims: The spontaneous preference for dietary lipids is, principally, regulated by two lingual fat taste receptors, i.e., CD36 and GPR120. Obese animals and most of human subjects exhibit low oro-sensory perception of dietary fat because of malfunctioning of these taste receptors. Our aim was to target the two fat taste receptors by newly synthesized high affinity fatty acid agonists to decrease fat-rich food intake and obesity.
Methods: We synthesized two fat taste receptor agonists (FTA), i.e., NKS-3 (CD36 agonist) and NKS-5 (CD36 & GPR120 agonist). We determined their molecular dynamic interactions with fat taste receptors, and the effect on Ca2+ signaling in mouse and human taste bud cells (TBC). In C57Bl/6 male mice, we assessed their gustatory perception and effects of their lingual application on activation of tongue-gut loop. We elucidated their effects on obesity and its related parameters in male mice, fed a high-fat diet.
Results: The two FTA, NKS-3 and NKS-5, triggered higher Ca2+ signaling than a dietary long-chain fatty acid in human and mouse TBC. Mice exhibited a gustatory attraction for these compounds. In conscious mice, the application of FTA onto the tongue papillae induced activation of tongue-gut loop, marked by the release of pancreato-bile juice into collecting duct, and cholecystokinin and peptide-YY into blood stream. Daily intake of NKS-3 or NKS-5 via feeding bottles decreased food intake and progressive weight gain in obese, but not in control, mice.
Conclusions: Our results show that targeting fat sensors in the tongue by novel chemical fat taste agonists might represent a new strategy to reduce obesity.
Keywords: CD36; Fat taste; GPR120; lipids; obesity.
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