Abstract
The identification, characterization, and synthesis of luteinizing-hormone-releasing hormone (LH-RH) introduced a potential and exciting new approach for the treatment of male and female infertility. This application, which theoretically coincides with the profertility LH-releasing role played by endogenous LH-RH, has been and continues to be exhustively pursued, but use of the chemically and biologically identical synthetic LH-RH in a variety of clinical situations has never achieved its anticipated therapeutic promise. Primary responsibility for the inconsistency of the results has been attributed to the short half-life of the peptide, and it was hoped that this problem might be circumvented by increased exposure (e.g., through more frequent administration or constant infusion) or by employing LH-RH derivatives with prolonged activity. However, despite heroic treatment regimens and the use of a number of LH-RH agonistic analogues with much-increased potency and duration of activity, there has been little improvement in the clinical utility of this approach. In fact, comprehensive reproductive pharmacological evaluation has revealed that the LH-releasing property responsible for the original profertility classification imparts definite correlatable and predictable antireproductive activity. This paradoxical relationship, first evidenced in laboratory animals by the ability of these agents to terminate pregnancy, disrupt cyclicity, retard puberty, and inhibit spermatogenesis, has been extended to humans, in whom LH-RH and its agonistic analogues have been shown to induce luteolysis and premature menstruation. The identification of the antireproductive nature of LH-RH and agonists, aside from providing an explanation for their disappointing performance in treating various hypogonadal states, has, quite ironically, established the concept of these peptides as a novel class of contraceptive agents.
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Bex, F.J., Corbin, A. (1981). Antifertility Effects of LH-RH and Its Agonists. In: McKerns, K.W. (eds) Reproductive Processes and Contraception. Biochemical Endocrinology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3824-6_5
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