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Science 29 March 1985:
Vol. 227. no. 4694, pp. 1583 - 1586
DOI: 10.1126/science.3883490
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Articles

Science, Vol 227, Issue 4694, 1583-1586
Copyright © 1985 by American Association for the Advancement of Science

articles

Receptor-mediated transport of insulin across endothelial cells

GL King and SM Johnson

Hormones such as insulin are transported from the interior to the exterior of blood vessels. Whether endothelial cells, which line the inner walls of blood vessels have a role in this transport of hormones is not clear, but it is known that endothelial cells can internalize and release insulin rapidly with little degradation. The transport of iodine-125-labeled insulin was measured directly through the use of dual chambers separated by a horizontal monolayer of cultured bovine aortic endothelial cells. In this setting, endothelial cells took up and released the labeled insulin, thereby transporting it across the cells. The transport of insulin across the endothelial cells was temperature sensitive and was inhibited by unlabeled insulin and by antibody to insulin receptor in proportion to the ability of these substances to inhibit insulin binding to its receptor. More than 80 percent of the transported insulin was intact. These data suggest that insulin is rapidly transported across endothelial cells by a receptor-mediated process.


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