Abstract
Affinity constants for five antagonists at histamine H1-receptors in guinea pig brain have been determined from inhibition of the potentiation by histamine of the adenosine-induced accumulation of cyclic AMP in cerebral cortical slices. This action of histamine appeared to be mediated solely through H1-receptors. The affinity constants obtained were similar to those determined on peripheral H1-receptors and from inhibition of high-affinity [3H]mepyramine binding. This provides strong evidence that at least some of the [3H]mepyramine binding sites in guinea pig brain can be identified with functional H1-receptors.
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