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- W2039148049 abstract "The role of anions in the maintenance of tension in electrically driven left atria isolated from guinea pigs has been examined. The disulfonic stilbene anion-channel blockers SITS (4-acetamido-4′-isothiocyanostilbene 2′-disulfonate) and DIDS (4,4′-diisothiocyano-2,2′-stilbene disulfonate) decreased the contractile force developed in a time- and concentration-dependent manner. As in the red cell anion channel, DIDS was more potent than SITS, but the maximal inhibition of tension produced by N-(4-azido-2-nitrophenyl)-2-aminoethyl sulfonate (NAP-taurine) was considerably lower than the near maximal inhibition produced by SITS and DIDS. The inhibition by SITS and DIDS was irreversible, suggesting a covalent interaction, and could not be overcome by increasing the calcium concentration or the frequency of stimulation. Consistent with a requirement for chloride anion, substitution of chloride and bicarbonate by the impermeant anion gluconate did not support contraction, while only partial tension was maintained with the lipophilic anions acetate and thiocyanate. Incubation of atria with 400 μM SITS blocked both 36 Cl and 45 Ca uptake to a similar extent, whereas the efflux of both these ions was not affected by incubation of the atria with SITS. The blockade by disulfonic stilbene anion-channel blockers of the contraction of the guinea pig myocardium may result from impairment of excitation–contraction coupling." @default.
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- W2039148049 date "1985-08-01" @default.
- W2039148049 modified "2023-10-18" @default.
- W2039148049 title "Effect of disulfonic stilbene anion-channel blockers on the guinea-pig myocardium" @default.
- W2039148049 doi "https://doi.org/10.1139/y85-151" @default.
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