title: Comparative expression of hexose transporters (SGLT1, GLUT1, GLUT2 and GLUT5) throughout the mouse gastrointestinal tract.
abstract: Hexose transporters play a pivotal role in the absorption of food-derived monosaccharides in the gastrointestinal tract. Although a basic knowledge of the hexose transporters has already been gained, their detailed distribution and comparative intensities of expression throughout the gastrointestinal tract have not been fully elucidated. In this study, we quantitatively evaluated the expression of SGLT1, GLUT1, GLUT2, and GLUT5 by in situ hybridization and real-time PCR techniques using a total of 28 segments from the gastrointestinal tract of 9-week-old mice. GLUT2 and GLUT5 mRNA expressions were detected predominantly from the proximal to middle parts of the small intestine, showing identical expression profiles, while SGLT1 mRNA was expressed not only in the small intestine but also in the large intestine. Notably, GLUT1 mRNA was expressed at a considerable level in both the stomach and large intestine but was negligible in the small intestine. Immunohistochemistry demonstrated the polarized localization of hexose transporters in the large intestine: SGLT1 on the luminal surface and GLUT1 on the basal side of epithelial cells. The present study provided more elaborate information concerning the localization of hexose transporters in the small intestine. Furthermore, this study revealed the significant expression of glucose transporters in the large intestine, suggesting the existence of the physiological uptake of glucose in that location in mice.
authors.affiliation: Laboratory of Animal Science, Kyoto Prefectural University, Hanngi-cho 1-5, Shimogamo, Sakyo-ku, Kyoto 606-8522, Japan.
authors.forename: Tohru
authors.initials: T
authors.lastname: Yoshikawa
authors.forename: Ryo
authors.initials: R
authors.lastname: Inoue
authors.forename: Megumi
authors.initials: M
authors.lastname: Matsumoto
authors.forename: Takaji
authors.initials: T
authors.lastname: Yajima
authors.forename: Kazunari
authors.initials: K
authors.lastname: Ushida
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Iwanaga
mesh_terms: D000818:Animals; D041981:Gastrointestinal Tract / Q000378:metabolism*; D051246:Glucose Transport Proteins, Facilitative / Q000096:biosynthesis*; D051272:Glucose Transporter Type 1 / Q000096:biosynthesis*; D051273:Glucose Transporter Type 2 / Q000096:biosynthesis*; D051296:Glucose Transporter Type 5; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D012333:RNA, Messenger / Q000378:metabolism; D051269:Sodium-Glucose Transporter 1 / Q000096:biosynthesis*
chemical_list: D051246:Glucose Transport Proteins, Facilitative; D051272:Glucose Transporter Type 1; D051273:Glucose Transporter Type 2; D051296:Glucose Transporter Type 5; D012333:RNA, Messenger; C495678:Slc2a1 protein, mouse; C495682:Slc2a2 protein, mouse; C465351:Slc2a5 protein, mouse; C495675:Slc5a1 protein, mouse; D051269:Sodium-Glucose Transporter 1