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. 1991 Jun;103(2):1573–1579. doi: 10.1111/j.1476-5381.1991.tb09829.x

Identification and characterization of histamine H1- and H2-receptors in guinea-pig left atrial membranes by [3H]-mepyramine and [3H]-tiotidine binding.

Y Hattori 1, M Endou 1, S Gando 1, M Kanno 1
PMCID: PMC1908349  PMID: 1909203

Abstract

1. Histamine receptors in the membranes prepared from guinea-pig left atria were characterized with [3H]-mepyramine and [3H]-tiotidine binding. 2. The binding of the H1-antagonist, [3H]-mepyramine, was saturable and of high affinity with a maximum binding capacity of 307 +/- 27 fmol mg-1 protein (n = 14) and with an equilibrium dissociation constant (KD) of 1.5 +/- 0.2 nM (n = 14). The binding was rapid and readily reversible. 3. The competition curve for [3H]-mepyramine binding by histamine was biphasic and revealed high and low affinity states of binding. The addition of 5'-guanylylimidodiphosphate (GppNHp) (100 microM) converted this heterogeneous binding into homogeneous binding of low affinity. 4. The competition curves of H1-antagonists with [3H]-mepyramine had Hill coefficients not significantly different from unity, consistent with competition with [3H]-mepyramine at a single site. GppNHp did not shift the competition curves. 5. Dissociation constants for H1-antagonists determined from inhibition of [3H]-mepyramine binding correlated well with the constants derived from inhibition of the positive inotropic response of guinea-pig left atria to histamine. 6. The H2-antagonist, [3H]-tiotidine, labelled an apparently homogeneous population of recognition sites with a maximum binding capacity of 41 +/- 8 fmol mg-1 protein (n = 6) and a KD of 10.8 +/- 1.2 nM (n = 6). 7. Although histamine competed for [3H]-tiotidine binding in a concentration-dependent manner, the curve was monophasic and was not shifted by GppNHp. 8. It is concluded that both H1- and H2-receptors exist in guinea-pig left atria. H1-receptors probably couple to intracellular effector(s) through a guanine nucleotide-dependent transducing mechanism. (ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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