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AJP - Gastrointestinal and Liver Physiology, Vol 271, Issue 3 477-G482, Copyright © 1996 by American Physiological Society
ARTICLES |
C. I. Cheeseman and R. Tsang
Department of Physiology, University of Alberta, Edmonton, Canada. cheese@dean.med.ualberta.ca
The effect of gastric inhibitory polypeptide (GIP) and the related glucagon-like peptides-1 and -2 (GLP-1 and GLP-2) on jejunal basolateral membrane glucose transport was investigated to determine if the upregulation produced by luminal hexoses could be explained by the release of one or more of these peptides. Luminal perfusion of the rat jejunum for 4 h, under pentobarbital sodium anesthesia, with 100 mM D-glucose produced a significant increase in plasma GIP levels. Vascular infusion of saline containing 100-800 pM GIP also increased the maximal transport rate for carrier-mediated glucose uptake in jejunal basolateral membrane vesicles. The effect of vascular 400 pM GIP was maximal after 1 h and maintained out to 4 h. The effect of luminal glucose could be blocked by preinjection with anti-GIP antibodies, whereas an antineurotensin antibody had no effect. Vascular infusion with 800 pM GLP-1-(7-36) amide had no effect, but GLP-2 (400 and 800 pM) increased the D-glucose maximal transport rate. An anti-GLP antibody was able to block the response to luminal glucose.
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