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. 1994 Jun;112(2):690–694. doi: 10.1111/j.1476-5381.1994.tb13131.x

Blockade by 4,4'-diisothiocyanatostilbene-2,2'-disulphonate (DIDS) of P2X-purinoceptors in rat vas deferens.

R Bültmann 1, K Starke 1
PMCID: PMC1910378  PMID: 8075889

Abstract

1. The possibility of an antagonist effect of 4,4'-diisothiocyanatostilbene-2,2'-disulphonate (DIDS) at P2X-purinoceptors was studied in rat vas deferens. 2. DIDS reduced contractions elicited by alpha,beta-methylene ATP 3 microM, IC50 1.6 microM, but did not change contractions elicited by K+ 35 mM. DIDS 3.2 microM slightly shifted the concentration-response curve of alpha,beta-methylene ATP to the right and reduced the maximum. DIDS 10 microM markedly decreased and DIDS 32 microM abolished contractions over the entire range of the alpha, beta-methylene ATP concentration-response curve. DIDS 32 microM also abolished contractions elicited by ATP but did not change contractions elicited by noradrenaline. The antagonist effect of DIDS was only slowly reversible. 3. The presence of either suramin 320 microM or alpha,beta-methylene ATP 10 microM during the exposure to DIDS protected the tissue from the long-lasting blocking effect of DIDS. 4. 4,4'-Diisothiocyanatodihydrostilbene-2,2'-disulphonate (H2DIDS) was equipotent with DIDS whereas several analogues in which one or both of the isothiocyanate residues were replaced were less effective or without effect against alpha,beta-methylene ATP. 5. DIDS attenuated the purinergic component of neurogenic contractions elicited by electrical field stimulation, IC50 3.9 microM, but did not change the adrenergic component. 6. It is concluded that DIDS causes a selective, long-lasting, non-equilibrium blockade of P2X-purinoceptors in rat vas deferens. Due to this effect it also selectively blocks the purinergic component of neurogenic contractions.

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Selected References

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