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Am J Physiol Gastrointest Liver Physiol 246: G101-G107, 1984;
0193-1857/84 $5.00
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AJP - Gastrointestinal and Liver Physiology, Vol 246, Issue 2 101-G107, Copyright © 1984 by American Physiological Society

ARTICLES

Development of nutrient transport systems in chick jejunum

A. T. Shehata, J. Lerner and D. S. Miller

Glutamate, beta-alanine, choline, and myoinositol transport was characterized in jejunal slices and brush-border membrane vesicles from 2- and 21-day chicks. Carrier-mediated, i.e., competitor-inhibitable, transport in slices (wet weight basis) and vesicles (protein basis) declined with age for the two amino acids but increased with age for myo-inositol; transport of choline did not change. These findings, along with previous data for the hexose system, cannot be explained solely by nonspecific changes in brush-border membrane architecture or permeability or by changes in the electrochemical sodium gradient that drives cotransport. They indicate that each specific brush-border membrane transport mechanism follows separate developmental time tables.


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Ontogenetic expression and regulation of Na+-D-glucose cotransporter in jejunum of domestic chicken
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