Regional expression patterns of taste receptors and gustducin in the mouse tongue.
In order to understand differences in taste sensitivities of taste bud cells between the anterior and posterior part of tongue, it is important to analyze the regional expression patterns of genes related to taste signal transduction on the tongue. Here we examined the expression pattern of a taste receptor family, the T1r family, and gustducin in circumvallate and fungiform papillae of the mouse tongue using double-labeled in situ hybridization. Each member of the T1r family was expressed in both circumvallate and fungiform papillae with some differences in their expression patterns. The most striking difference between fungiform and circumvallate papillae was observed in their co-expression patterns of T1r2, T1r3, and gustducin. T1r2-positive cells in fungiform papillae co-expressed T1r3 and gustducin, whereas T1r2 and T1r3 double-positive cells in circumvallate papillae merely expressed gustducin. These results suggested that in fungiform papillae, gustducin might play a role in the sweet taste signal transduction cascade mediated by a sweet receptor based on the T1r2 and T1r3 combination, in fungiform papillae.
Kim
Mi-Ryung
MR
Gustatory Biology Laboratory, National Food Research Institute, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan.
Kusakabe
Yuko
Y
Miura
Hirohito
H
Shindo
Yoichiro
Y
Ninomiya
Yuzo
Y
Hino
Akihiro
A
D000818:Animals; D002478:Cells, Cultured; D005786:Gene Expression Regulation; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D043562:Receptors, G-Protein-Coupled / Q000145:classification* / Q000378:metabolism*; D013650:Taste Buds / Q000166:cytology / Q000378:metabolism; D014018:Tissue Distribution; D014059:Tongue / Q000166:cytology / Q000378:metabolism*; D015293:Transducin / Q000378:metabolism*
D043562:Receptors, G-Protein-Coupled; C431926:taste receptors, type 1; C075192:gustducin; D015293:Transducin