Expression of glucose transporter 4 in the human pancreatic islet of Langerhans.
Glucose transporter 4 (GLUT4) is the main insulin-responsive glucose transporter in skeletal muscle and adipose tissue of human and rodent, and is translocated to the plasma membrane in response to insulin. GLUT2 is well known as the main glucose transporter in pancreatic islets and could highly regulate glucose-stimulated insulin secretion by B-cells as a glucose sensor. We confirmed the presence of GLUT4 mRNA and GLUT4 protein in pancreas in the human. Indirect immunohistochemistry showed that the pancreatic islets of human and rat were conspicuously labeled by anti-GLUT4 antibody. The presence of placental leucine aminopeptidase (P-LAP), a homologue of insulin-regulated aminopeptidase (IRAP), was also shown in the human pancreatic islet. IRAP/P-LAP is thought to be involved in glucose metabolism. This study provides the first evidence that GLUT4 is present in human and rat pancreatic islets and may suggest its specific role in glucose homeostasis in conjunction with IRAP/P-LAP.
Kobayashi
Honami
H
Department of Obstetrics and Gynecology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
Mitsui
Takashi
T
Nomura
Seiji
S
Ohno
Yasumasa
Y
Kadomatsu
Kenji
K
Muramatsu
Takashi
T
Nagasaka
Tetsuro
T
Mizutani
Shigehiko
S
D000818:Animals; D001483:Base Sequence; D010122:Cystinyl Aminopeptidase / Q000378:metabolism; D017931:DNA Primers; D051275:Glucose Transporter Type 4; D006801:Humans; D007150:Immunohistochemistry; D007515:Islets of Langerhans / Q000378:metabolism*; D009004:Monosaccharide Transport Proteins / Q000235:genetics* / Q000378:metabolism; D009124:Muscle Proteins; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats
D017931:DNA Primers; D051275:Glucose Transporter Type 4; D009004:Monosaccharide Transport Proteins; D009124:Muscle Proteins; D012333:RNA, Messenger; C495692:SLC2A4 protein, human; C495694:Slc2a4 protein, rat; D010122:Cystinyl Aminopeptidase; C105964:leucyl-cystinyl aminopeptidase