Abstract
The pharmacological specificity of adrenergic receptors in the plasma membrane of rat ascites hepatoma AH130 cells was compared with that in normal rat hepatocytes. The number of [ 125I]iodocyanopindolol-binding sites was much greater in AH130 cells than in the hepatocytes. We characterized the α-adrenergic receptor subtypes using the α 1-selective ligand [ 3H]prazosin and the α 2-selective ligand [ 3H]clonidine. AH130 cells had fewer prazosin-binding sites than the hepatocytes and about 8 times as many clonidine-binding sites of high affinity. The results showed that the adrenergic receptors in AH130 cells have pharmacological properties that are very different from those of the receptors in normal rat hepatocytes.
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