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High affinity binding sites for endothelin (ET)-1 were identified on mouse parenchymal hepatocytes. The binding of 125I-ET-1 at its site was specific, saturable, and time dependent, but dissociation of the receptor-bound ligand was minimal. Scatchard analysis of the binding data revealed the presence of a non-interacting, single class of high-affinity binding sites on hepatocytes. The dissociation binding constant (Kd) and the maximal binding capacity (Bmax) were determined as 2.1 x 10(-10) M and 3.0 x 10(2) sites/cell, respectively. Unlabeled ET-1 competitively inhibited the binding of 125I-ET-1 to primary cultured mouse hepatocytes with a concentration for half-maximal inhibition (IC50) of 2.0 x 10(-10) M. ET-1 apparently enhanced total protein synthesis in primary cultured mouse hepatocytes concentration ranging from 3 x 10(-11) M to 3 x 10(-8) M in a dose-dependent manner. These data indicate that specific receptor for ET-1 is present in the mouse liver and suggest for the first time that hepatocyte protein synthesis is involved in its direct, agonistic effect.

Specific hepatocyte endothelin receptors and the direct effect of endothelin on protein synthesis.