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. 1995 Mar;114(6):1125–1132. doi: 10.1111/j.1476-5381.1995.tb13324.x

Effects of suramin on contractions of the guinea-pig vas deferens induced by analogues of adenosine 5'-triphosphate.

S J Bailey 1, S M Hourani 1
PMCID: PMC1510367  PMID: 7620701

Abstract

1. Adenosine 5'-triphosphate (ATP) and some of its analogues contract the guinea-pig vas deferens, acting via receptors which have been classified as P2X-purinoceptors. We have recently shown, however, that the effects of ATP are enhanced, rather than inhibited, by the non-selective P2 antagonist, suramin, and that this enhancement could not easily be explained in terms of inhibition by suramin of the breakdown of ATP. We therefore investigated the effects of suramin on contractions induced by ATP analogues, to define the structure-activity relationships of the suramin-resistant response. 2. In the absence of suramin, the order of potency for ATP analogues was adenosine 5'-(alpha,beta-methylene)triphosphonate (AMPCPP) = P1,P5-diadenosine pentaphosphate (Ap5A) = adenosine 5'-tetraphosphate (Ap4) > adenosine 5'-O-(3-thiotriphosphate) (ATP gamma S) = adenylyl 5'-(beta,gamma-methylene) diphosphonate (AMPPCP) > P1,P5-diadenosine tetraphosphate (Ap4A) > adenosine 5'-O-(2- thiodiphosphate) (ADP beta S) > 2-methylthioadenosine 5'-triphosphate (MeSATP) > or = ATP > adenosine 5'-diphosphate (ADP). This is generally in agreement with previously reported structure-activity relationships in this tissue. 3. In the presence of suramin (1 mM), responses to Ap5A, Ap4A, AMPPCP, ADP beta S and ADP were abolished or greatly reduced, and contractions induced by AMPCPP, Ap4 and ATP gamma S were inhibited. Contractions induced by MeSATP however, like those induced by ATP itself, were not reduced, but at concentrations above 100 microM were enhanced.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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