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Related Experiment Videos

The selectivity of a new progestin.

A Phillips1

  • 1Robert Wood Johnson Pharmaceutical Research Institute, Raritan, N.J.

Acta Obstetricia Et Gynecologica Scandinavica. Supplement
|January 1, 1990
PubMed
Summary

Norgestimate, a progestin in oral contraceptives, effectively stimulates the endometrium and inhibits ovulation. Unlike other progestins, it exhibits minimal androgenic activity, demonstrating high selectivity.

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Area of Science:

  • Pharmacology
  • Endocrinology
  • Reproductive Biology

Background:

  • Norgestimate is a novel progestin formulated for combination oral contraceptives with ethinyl estradiol.
  • Progestins play a crucial role in reproductive health and hormonal regulation.

Purpose of the Study:

  • To evaluate the progestational efficacy and selectivity of norgestimate.
  • To compare the androgenic activity of norgestimate with other progestins.

Main Methods:

  • In vitro receptor binding assays (androgen receptor, sex hormone-binding globulin).
  • In vivo studies in rabbits (uterine progestational effect) and rats (ovulation inhibition, androgenic activity assessment).
  • Assessment of luteinizing hormone release from rat pituitary cells in culture.
Keywords:
Animals, LaboratoryBiologyClinical ResearchContraceptionContraceptive Agents, Female--pharmacodynamicsContraceptive Agents, Progestin--pharmacodynamicsContraceptive Agents--pharmacodynamicsContraceptive Mode Of ActionEvaluationFamily PlanningHormone ReceptorsMembrane ProteinsOvulation SuppressionPhysiologyResearch Methodology

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Main Results:

  • Norgestimate demonstrated significant progestational activity in rabbit uterine models.
  • Norgestimate exhibited minimal affinity for the androgen receptor compared to levonorgestrel and gestodene.
  • Preclinical models showed norgestimate lacks significant androgenic effects, unlike other progestins like levonorgestrel, gestodene, and desogestrel.

Conclusions:

  • Norgestimate possesses significant progestational efficacy.
  • Norgestimate displays remarkable selectivity due to its minimal androgenic activity.
  • These findings support norgestimate's suitability as a progestin in oral contraceptives.