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Am J Physiol Cell Physiol 256: C197-C203, 1989;
0363-6143/89 $5.00
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AJP - Cell Physiology, Vol 256, Issue 1 C197-C203, Copyright © 1989 by American Physiological Society

ARTICLES

Differing effects of apical and basolateral adenosine on colonic epithelial cell line T84

K. E. Barrett, P. A. Huott, S. S. Shah, K. Dharmsathaphorn and S. I. Wasserman
Department of Medicine, University of California, San Diego 92103.

Adenosine and its agonists, 5'-(N-ethylcarboxamido)adenosine and N6-(D-2-phenylisopropyl)-adenosine, induced a sustained increase in chloride secretion when added to either the apical or basolateral aspect of monolayers of the human colonic epithelial cell line T84. Secretion was induced with identical kinetics by addition to both sides, but apical addition was less potent. The rank order of potency of the agonists on either side was consistent with the presence of an adenosine A2-receptor, but the apical and basolateral receptors differed in both their ability to stimulate increases in adenosine 3',5'-cyclic monophosphate, and their susceptibility to down-modulation by chronic exposure to 5'-(N-ethylcarboxamido) adenosine in culture.


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