title: Overexpression of glucose transporter 2 in GT1-7 cells inhibits AMP-activated protein kinase and agouti-related peptide expression.
abstract: Glucose transporter 2 (GLUT2) has been proposed as a glucose sensor in pancreatic beta cells. GLUT2 has been found widely expressed in the brain and GLUT2 in the hypothalamus and hindbrain has been suggested to be involved in the central glucose sensing and regulation of glucose homeostasis and food intake. In this study, we overexpressed GLUT2 in GT1-7 neuroblastoma cells and investigated the effect of GLUT2 overexpression on cellular energy status in these cells. Compared with control cells, GLUT2 overexpression resulted in significantly increased cellular ATP levels at 5 and 25 mM glucose concentrations, more inhibition of agouti-related peptide (AgRP) mRNA and AMP-activated protein kinase (AMPK) phosphorylation by glucose, and attenuated stimulation of AgRP mRNA and AMPK by 2-deoxy-d-glucose (2DG), implicating that brain GLUT2 may be important in the regulation of food intake.
authors.affiliation: School of Human Ecology, Louisiana State University AgCenter and Pennington Biomedical Research Center, Baton Rouge, LA 70803, USA.
authors.forename: Bing
authors.initials: B
authors.lastname: Li
authors.forename: Kichoon
authors.initials: K
authors.lastname: Lee
authors.forename: Roy J
authors.initials: RJ
authors.lastname: Martin
mesh_terms: D055372:AMP-Activated Protein Kinases; D000255:Adenosine Triphosphate / Q000096:biosynthesis; D054369:Agouti-Related Protein; D000818:Animals; D001069:Appetite Regulation / Q000502:physiology*; D001921:Brain / Q000378:metabolism*; D045744:Cell Line, Tumor; D003847:Deoxyglucose / Q000378:metabolism / Q000494:pharmacology; D004734:Energy Metabolism / Q000187:drug effects / Q000502:physiology; D005947:Glucose / Q000378:metabolism*; D051273:Glucose Transporter Type 2 / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D009097:Multienzyme Complexes / Q000378:metabolism*; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D010446:Peptide Fragments / Q000235:genetics / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D012333:RNA, Messenger / Q000187:drug effects / Q000378:metabolism
chemical_list: D054369:Agouti-Related Protein; D051273:Glucose Transporter Type 2; D009097:Multienzyme Complexes; D010446:Peptide Fragments; D012333:RNA, Messenger; C495682:Slc2a2 protein, mouse; C412618:agouti-related peptide, (Yc(CRFFNAFC)Y); D000255:Adenosine Triphosphate; D003847:Deoxyglucose; D017346:Protein Serine-Threonine Kinases; D055372:AMP-Activated Protein Kinases; D005947:Glucose