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. 1991 Jul;103(3):1745–1751. doi: 10.1111/j.1476-5381.1991.tb09857.x

Inhibition by cations of antagonist binding to histamine H1-receptors: differential effect of sodium ions on the binding of two radioligands.

J M Treherne 1, J S Stern 1, W J Flack 1, J M Young 1
PMCID: PMC1907796  PMID: 1681976

Abstract

1. Measurements have been made of the inhibition by mono- and divalent cations of the binding of [3H]-(+)-N-methyl-4-methyldiphenhydramine ([3H]-QMDP) to histamine H1-receptors in homogenates of guinea-pig cerebellum. 2. The binding of [3H]-QMDP was inhibited by monovalent cations with an order of potency Li+ = Na+ greater than K+ greater than Cs+ = Rb+. The IC50 for Li+ was 39 mM, but that for K+ was 132 mM. Hill coefficients for inhibition curves for Li+ and Na+ were less than 1. 3. Divalent cations also inhibited the binding of [3H]-QMDP. The most potent cations examined were Hg2+, Cd2+ and Zn2+, with IC50 values of 5, 17 and 41 microM, respectively. Ca2+ and Mg2+ were relatively weak inhibitors (IC50 12 and 34 mM, respectively). The potency of Ni2+, Co2+ and Mn2+ was intermediate between these groups. Hill coefficients for inhibition curves for Hg2+, Cd2+ and Zn2+ were greater than 1, but Hill coefficients for the other cations were less than 1. 4. Both mono- and divalent cations also inhibited the binding of [3H]-mepyramine. The divalent cations were approximately equipotent in inhibiting the binding of [3H]-QMDP and [3H]-mepyramine. The same was true for Li+. However, Na+ was markedly more effective against [3H]-QMDP binding than against the binding of [3H]-mepyramine. 5. The effect of 40 mM Li+ on the parameters of binding of [3H]-mepyramine was to increase the best-fit value of the concentration giving half-maximal binding EC50, by approximately 2 fold without having any significant effect on the maximum amount of binding.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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