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[Estrogens. Contraceptive therapy]

I Sojo-Aranda1, V Cortés-Gallegos

  • 1IMSS, Unidad de Investigación Médica en Enfermedades Gonadales, Hospital de Gineco Obstetricia, Luis Castelazo Ayala, México, D.F.

Ginecologia Y Obstetricia De Mexico
|January 1, 1995
PubMed
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Ethinyl estradiol (EE-2) in oral contraceptives does not significantly compete with natural estradiol at circulating levels, but local endometrial effects suggest a reconsideration of current contraceptive approaches.

Area of Science:

  • Endocrinology
  • Reproductive Science
  • Pharmacology

Background:

  • Oral contraceptives (OCs) utilize synthetic estrogens like ethinyl estradiol (EE-2) to prevent pregnancy.
  • Understanding the competitive interaction between exogenous EE-2 and endogenous estradiol (E-2) is crucial for evaluating contraceptive efficacy and side effects.
  • The intra- and extracellular dynamics of these hormones within the reproductive system require further investigation.

Purpose of the Study:

  • To evaluate the competitive molecular phenomenon of ethinyl estradiol (EE-2) against endogenous estradiol (E-2) in women using OCs.
  • To quantify EE-2 and E-2 levels in plasma and endometrial samples to assess their interaction.
  • To determine if EE-2 competes with E-2 at circulating and local endometrial levels.

Main Methods:

Keywords:
AmericasBiologyComparative StudiesContraceptionContraceptive AgentsContraceptive Agents, EstrogenContraceptive Agents, FemaleContraceptive Agents, ProgestinContraceptive MethodsDeveloping CountriesEndocrine SystemEstradiolEstrogensEthinyl EstradiolFamily PlanningHormonesLatin AmericaMexicoNorethindroneNorgestrelNorth AmericaOral ContraceptivesOral Contraceptives, CombinedPhysiologyProspective StudiesResearch MethodologyResearch ReportStudies

Related Experiment Videos

  • Simultaneous collection of plasma and endometrial samples from women using OCs containing EE-2 with either Norgestrel or Norethindrone.
  • Quantification of both ethinyl estradiol (EE-2) and endogenous estradiol (E-2) in collected samples.
  • Analysis of hormone levels across different days of the pseudomenstrual cycle.

Main Results:

  • Chronic administration of OCs, even with lower EE-2 content (30 micrograms), did not substantially compete with endogenous E-2 at the circulating plasma level.
  • The cyclic pattern of natural estradiol was maintained in the plasma of OC users.
  • Significant competition or displacement of E-2 by EE-2 was not observed in the endometrial compartment.

Conclusions:

  • Low-dose ethinyl estradiol (EE-2) in combined oral contraceptives does not significantly inhibit endogenous estradiol (E-2) at the systemic level.
  • The lack of competitive inhibition in the endometrium suggests that local effects may contribute to contraceptive action.
  • Future contraceptive development may require a different approach, considering local endometrial mechanisms beyond systemic estrogenic competition.