Am J Physiol Cell Physiol AJP: Heart and Circulatory Physiology
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Am J Physiol Cell Physiol 263: C607-C615, 1992;
0363-6143/92 $5.00
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AJP - Cell Physiology, Vol 263, Issue 3 C607-C615, Copyright © 1992 by American Physiological Society


ARTICLES

Stimulation of intestinal Cl- transport by heat-stable enterotoxin: activation of cAMP-dependent protein kinase by cGMP

L. R. Forte, P. K. Thorne, S. L. Eber, W. J. Krause, R. H. Freeman, S. H. Francis and J. D. Corbin
Department of Pharmacology, Missouri University School of Medicine, Columbia.

Heat-stable enterotoxins activate guanylate cyclase, whereas heat-labile enterotoxins stimulate adenylate cyclase. Both classes of toxins cause secretory diarrhea at least in part by stimulating Cl- secretion in the intestine. The mechanism for regulation of Cl- secretion by guanosine 3',5'-cyclic monophosphate (cGMP) was investigated using cultured T84 intestinal cells as a model for intestinal crypt cells. Escherichia coli heat-stable enterotoxin (ST) markedly stimulated cGMP production in T84 cells. Cl- secretion across T84 cell monolayers cultured on permeable filters was stimulated by E. coli ST, cholera toxin, or 8-BrcAMP, but 8-BrcGMP was ineffective. cGMP analogues that are known to be potent and specific activators of cGMP-dependent protein kinase (cG-kinase) also had little effect on 36Cl- uptake by T84 cells cultured in plastic dishes. E. coli ST, forskolin, cholera toxin, or membrane-permeant cAMP analogues markedly increased 36Cl- uptake into T84 cells. The general protein kinase inhibitor, staurosporine, inhibited the stimulation of Cl- permeability elicited by E. coli ST, vasoactive intestinal peptide (VIP), or 8-BrcAMP. DEAE-Sephacel chromatography revealed a predominant type II isoform of cAMP-dependent protein kinase (cA-kinase) in T84 cells, whereas little or no cytosolic cG-kinase activity was found. Treatment of T84 cells with E. coli ST or VIP resulted in an increase in the cA-kinase activity ratio (-cAMP/+cAMP) if the cytosolic enzyme was assayed at reduced temperature (on ice).(ABSTRACT TRUNCATED AT 250 WORDS)


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