title: GPR expression in the rat taste bud relating to fatty acid sensing.
abstract: We investigated the expression of G protein-coupled receptor GPR40 and GPR120 in the rat tongue. Using reverse transcription polymerase chain reaction, we detected a significant expression of GPR120 mRNA in the epithelium of the circumvallate papillae but not in the nonsensory epithelium, while the expression of GPR40 mRNA was undetectable in the sensory papillae. Western blotting analysis of colon and circumvallate papillae for GPR120 showed a protein band with a molecular weight that corresponds to that of GPR120, indicating that this antibody could recognize a native form of GPR120. Immunohistochemistry using anti-GPR120 antibody revealed GPR120 immunoreactivity in the enteroendocrine cells of the colon. Furthermore, some cells in each taste bud were stained positively with more intense labeling in the apical part of the cells. These results suggested that GPR120 is expressed in the taste cells of the circumvallate papillae to sense dietary fat, like the receptor expressed in the enteroendocrine cells.
authors: Laboratory of Nutrition Chemistry, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Oiwakecho, Kitashirakawa, Japan.
authors: Shigenobu
authors: S
authors: Matsumura
authors: Takafumi
authors: T
authors: Mizushige
authors: Takeshi
authors: T
authors: Yoneda
authors: Toshihiko
authors: T
authors: Iwanaga
authors: Satoshi
authors: S
authors: Tsuzuki
authors: Kazuo
authors: K
authors: Inoue
authors: Tohru
authors: T
authors: Fushiki
mesh_terms: D000818:Animals; D005227:Fatty Acids / Q000502:physiology*; D051381:Rats; D043562:Receptors, G-Protein-Coupled / Q000096:biosynthesis* / Q000235:genetics; D013649:Taste / Q000502:physiology*; D013650:Taste Buds / Q000378:metabolism*
chemical_list: D005227:Fatty Acids; D043562:Receptors, G-Protein-Coupled