A sodium- and energy-dependent glucose transporter with similarities to SGLT1-2 is expressed in bovine cortical vessels.
In order to investigate glucose transport at the blood-brain barrier (BBB), glucose transport properties were studied pharmacologically with a novel model system of inverted bovine brain cortical arteries. These vessels displayed glucose transport characteristics of facilitative glucose transporters (GLUT1-5) and of sodium- and energy-dependent glucose transporters (SGLT1-2). So far, glucose transport in the central nervous system (CNS) has only been shown to be achieved by facilitative transporters, in particular by GLUT1 at the blood-brain barrier and in glial cells and by GLUT3 in a subset of neurons. We report here that a SGLT-like transporter might partake in glucose transport at the bovine BBB, as indicated by immunocytochemical analysis and by Western immunoblot analysis of cultured bovine brain endothelial cells. A RNA protection assay revealed the presence of a SGLT-like gene fragment in rabbit cortex.
Nishizaki
T
T
Department of Physiology, Kobe University School of Medicine, Japan.
Kammesheidt
A
A
Sumikawa
K
K
Asada
T
T
Okada
Y
Y
D000818:Animals; D015153:Blotting, Western; D002352:Carrier Proteins / Q000378:metabolism*; D002417:Cattle; D002478:Cells, Cultured; D002536:Cerebral Arteries / Q000378:metabolism*; D002540:Cerebral Cortex / Q000098:blood supply / Q000378:metabolism*; D004734:Energy Metabolism / Q000502:physiology*; D005947:Glucose / Q000378:metabolism; D007150:Immunohistochemistry; D066298:In Vitro Techniques; D008562:Membrane Glycoproteins; D008565:Membrane Proteins / Q000378:metabolism*; D009004:Monosaccharide Transport Proteins / Q000096:biosynthesis / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D011817:Rabbits; D012964:Sodium / Q000378:metabolism*; D051269:Sodium-Glucose Transporter 1
D002352:Carrier Proteins; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D009004:Monosaccharide Transport Proteins; D012333:RNA, Messenger; D051269:Sodium-Glucose Transporter 1; D012964:Sodium; D005947:Glucose