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Journal of Clinical Endocrinology & Metabolism, Vol 76, 75-78, Copyright © 1993 by Endocrine Society

ARTICLES

Abnormal facilitative glucose transporter gene expression in human islet cell tumors

Y Seino, T Yamamoto, K Inoue, M Imamura, S Kadowaki, H Kojima, J Fujikawa and H Imura
Department of Metabolism and Clinical Nutrition, Kyoto University Faculty of Medicine, Japan.

Our previous studies have shown that increased expression of GLUT1/erythrocyte and GLUT3/brain type glucose transporter genes in human tumors is associated with cellular transformation. We have now determined the levels of messenger RNAs (mRNAs) encoding these two glucose transporter isoforms as well as that of GLUT2/liver isoform in insulin-, glucagon-, and gastrin-secreting islet cell tumors. Northern blot analysis and reverse transcriptase-polymerase chain reaction revealed the presence of GLUT1 and GLUT3 mRNA in all human islet cell tumors and normal islets examined. In contrast, GLUT2 mRNA, which is present at high levels in normal islets, was not detected in insulinomas or other types of islet cell tumors. These results imply that GLUT1 and GLUT3 are primarily responsible for glucose uptake by these tumors.


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Copyright © 1993 by The Endocrine Society