Immune-related intestinal chloride secretion. II. Effect of adenosine on T84 cell line.

Journal Article (Journal Article)

The inflammatory mediator adenosine caused sustained Cl- secretion across monolayers of T84 cells. The effect was promptly reversed by the adenosine receptor antagonist 8-phenyltheophylline and appeared to be mediated through an adenosine A2-receptor [rank order of potency: 5'-(N-ethyl)-carboxamido-adenosine (NECA) greater than adenosine greater than (-)-N6-(phenylisopropyl)adenosine (PIA) greater than or equal to (+)-PIA]. High doses of adenosine and its analogues increased cellular adenosine 3',5'-cyclic monophosphate (cAMP) but not guanosine 3',5'-cyclic monophosphate (cGMP) or free cytosolic Ca2+. However, lower concentrations of adenosine had maximal effects on Cl- secretion with little or no effect on cAMP. In other respects, Cl- secretion resembled that induced by cAMP-mediated secretagogues such as vasoactive intestinal peptide (VIP). Addition of both low and high doses of NECA activated basolateral K+ and apical Cl- channels, exhibited synergism with Ca2(+)-mediated secretagogues, did not produce additive effects with VIP or Escherichia coli heat-stable enterotoxin, and was associated with cAMP-dependent protein kinase-mediated protein phosphorylation. The results suggest that either adenosine mobilizes an intracellular pool of cAMP that is extremely efficiently coupled to the cAMP-dependent protein kinase and is thereafter rapidly destroyed or that second messenger(s) other than cAMP, cGMP, or Ca2+ are able to activate Cl- secretion in the T84 cell line. In the latter case, such messenger(s), as yet unidentified, might represent a final common pathway for cyclic nucleotide-activated Cl- secretion.

Full Text

Duke Authors

Cited Authors

  • Barrett, KE; Cohn, JA; Huott, PA; Wasserman, SI; Dharmsathaphorn, K

Published Date

  • May 1990

Published In

Volume / Issue

  • 258 / 5 Pt 1

Start / End Page

  • C902 - C912

PubMed ID

  • 2159233

International Standard Serial Number (ISSN)

  • 0002-9513

Digital Object Identifier (DOI)

  • 10.1152/ajpcell.1990.258.5.C902


  • eng

Conference Location

  • United States