Abstract
The location of histamine H 1-receptors in the thoracic aorta of guinea-pigs was studied with a [ 3H]mepyramine binding assay. [ 3H]Mepyramine binding studies of whole and rubbed aortas, and of cultured endothelial and smooth muscle cells showed that the K d values were all in the range 0.53–0.76 nM, but that the B max values were 19.1, 10.1, 63.3 and 11.6 fmol/mg protein, respectively. Thus, the whole aorta contained more H 1-receptors than the rubbed one (free of endothelium), and cultured endothelial cells contained more H 1-receptors than smooth muscle cells. These results indicate that more histamine H 1-receptors were concentrated in the endothelial cells than in the smooth muscle cells in guinea-pig aorta.
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