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Interpretation of dose-response curves for luteinizing hormone release by gonadotropin-releasing hormone, related peptides, and leukotriene C4 according to a hormone/receptor/effector model.

The dose-response curves for pituitary luteinizing hormone (LH) release in response to gonadotropin-releasing hormone and its agonists are unusually broad. It appears, however, that these ligands bind to a single class of receptors. It is shown that these dose-response data can be explained by either of two models in which ligand-receptor complexes stimulate LH secretion by interacting with either of two different effector systems or by interacting with a single effector system but forming monomeric and dimeric active effector complexes. A combination of these two basic models can account for the very broad, biphasic dose-response curve reported for LH release in response to leukotriene C4.