title: The absence of urokinase-type plasminogen activator receptor plays a role in the insulin-independent glucose metabolism.
abstract: The urokinase-type plasminogen activator receptor (uPAR) is a glycosylphosphatidylinositol-anchored membrane protein with multiple functions. In the present study, we examined whether the uPAR plays any role in the regulation of glucose metabolism. The experiments were performed using male wild-type (uPAR) and uPAR knockout (uPAR) C57BL/6J mice. The blood glucose levels after the intraperitoneal injection of glucose were significantly decreased in uPAR mice compared with uPAR mice. On the other hand, there were no differences in the insulin secretion induced by glucose injection and the reactivity of insulin between uPAR and uPAR mice. The expression levels of glucose transporter 2 (GLUT2) in the liver and GLUT4 in the skeletal muscles from the uPAR mice were significantly increased compared with those of the uPAR mice. In addition, we found that the level of phosphorylation of AMP-activated protein kinase in skeletal muscles and myoblasts from the uPAR mice increased compared with those in uPAR mice. These data suggest that the increase in the GLUT2 and GLUT4 expression and the activation of AMP-activated protein kinase by uPAR deficiency enhances the glucose intake. These findings therefore provide new insights into the role of uPAR in the glucose metabolism.
authors.affiliation: Department of Clinical Pathological Biochemistry, Faculty of Pharmaceutical Science, Doshisha Women's Collage of Liberal Arts, Kodo Kyo-tanabe, Kyoto, Japan.
authors.forename: Kanji
authors.initials: K
authors.lastname: Tomogane
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Kanno
authors.forename: Eri
authors.initials: E
authors.lastname: Kawashita
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Okada
authors.forename: Koji
authors.initials: K
authors.lastname: Takeuchi
authors.forename: Shigeru
authors.initials: S
authors.lastname: Ueshima
authors.forename: Osamu
authors.initials: O
authors.lastname: Matsuo
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Matsuno
mesh_terms: D055372:AMP-Activated Protein Kinases / Q000096:biosynthesis / Q000235:genetics; D000818:Animals; D001786:Blood Glucose / Q000378:metabolism*; D004195:Disease Models, Animal; D005947:Glucose / Q000378:metabolism*; D051273:Glucose Transporter Type 2 / Q000096:biosynthesis / Q000235:genetics; D051275:Glucose Transporter Type 4 / Q000096:biosynthesis / Q000235:genetics; D007328:Insulin / Q000097:blood / Q000378:metabolism*; D000078790:Insulin Secretion; D008099:Liver / Q000502:physiology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D018482:Muscle, Skeletal / Q000502:physiology; D032446:Myoblasts / Q000502:physiology; D010179:Pancreas / Q000502:physiology; D055293:Receptors, Urokinase Plasminogen Activator / Q000172:deficiency* / Q000502:physiology*; D013997:Time Factors; D014568:Urokinase-Type Plasminogen Activator / Q000502:physiology*
chemical_list: D001786:Blood Glucose; D051273:Glucose Transporter Type 2; D051275:Glucose Transporter Type 4; D007328:Insulin; D055293:Receptors, Urokinase Plasminogen Activator; C495682:Slc2a2 protein, mouse; C495693:Slc2a4 protein, mouse; D055372:AMP-Activated Protein Kinases; D014568:Urokinase-Type Plasminogen Activator; D005947:Glucose