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  • Title: Differing effects of cGMP and cAMP on ion transport across flounder intestine.
    Author: Rao MC, Nash NT, Field M.
    Journal: Am J Physiol; 1984 Jan; 246(1 Pt 1):C167-71. PubMed ID: 6320655.
    Abstract:
    The intestinal epithelium of the winter flounder is highly cation selective and actively absorbs NaCl via a bumetanide-sensitive (Na + K + 2Cl) cotransport system; it also actively secretes K+. Combined addition of adenosine 3',5'-cyclic monophosphate (cAMP) and theophylline was previously shown to partially inhibit NaCl absorption and to increase passive Cl- permeability. Because theophylline increases cyclic GMP (cGMP) and cAMP concentrations, we compared the effects of the 8-Bromo analogues of these two nucleotides on ion transport. cGMP inhibits Cl- absorption, K+ secretion, and Cl- and K+ influx across the brush border as effectively as do furosemide and bumetanide. Even at maximal doses, cAMP is less effective than cGMP in inhibiting ion transport; however, unlike cGMP, it abolishes the cation selectivity of the epithelium by greatly increasing Cl- permeability. The effects of the two nucleotides are not additive with each other or with those of bumetanide, although cGMP or bumetanide can further inhibit transport in cAMP-treated tissues.
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