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Related Experiment Videos

The effect of contraceptive steroids on hypothalamic-pituitary function.

D R Mishell, O A Kletzky, P F Brenner

    American Journal of Obstetrics and Gynecology
    |May 1, 1977
    PubMed
    Summary

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    Oral contraceptives impact pituitary function, increasing prolactin and decreasing gonadotropin release. These effects on hormone levels may contribute to post-pill amenorrhea-galactorrhea syndrome.

    Area of Science:

    • Endocrinology
    • Reproductive Health
    • Pharmacology

    Background:

    • Oral contraceptives (OCs) are widely used for birth control.
    • Understanding their systemic effects, particularly on the pituitary gland, is crucial.

    Purpose of the Study:

    • To investigate the effects of oral contraceptives on pituitary hormone secretion.
    • To assess the impact of different contraceptive formulations on growth hormone (GH), thyroid-stimulating hormone (TSH), prolactin (PRL), luteinizing hormone (LH), and follicle-stimulating hormone (FSH) release.

    Main Methods:

    • Sequential pituitary stimulation test (SST) administered to normal women before and after 3 weeks of combination OCs or progestin-only contraceptives.
    • SST repeated in five long-term OC users.
    • Hormone levels (GH, TSH, PRL, LH, FSH) measured post-stimulation.
    Keywords:
    BiologyClinical ResearchContraceptionContraceptive Agents, Estrogen--administraction and dosageContraceptive Agents, Estrogen--side effectsContraceptive Agents, FemaleContraceptive Agents, Progestin--administraction and dosageContraceptive Agents, Progestin--side effectsContraceptive Agents--administraction and dosageContraceptive Agents--side effectsEndocrine SystemEthinyl Estradiol--administraction and dosageEthinyl Estradiol--side effectsFamily PlanningFollicle Stimulating Hormone--analysisGonadotropinsGonadotropins, PituitaryHormonesInjectablesLuteinizing Hormone--analysisMedroxyprogesterone Acetate--administraction and dosageMedroxyprogesterone Acetate--side effectsMestranolNorethindroneOral ContraceptivesOral Contraceptives, CombinedPhysiologyPituitary Hormones--analysisProlactin--analysisResearch Methodology

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    Main Results:

    • GH and TSH release remained unaffected by contraceptive steroids.
    • PRL release increased with both combination OCs and progestin-only contraceptives.
    • LH and FSH release decreased in most short-term and long-term combination OC users, but not in all long-term users or those on progestin-only contraceptives.

    Conclusions:

    • Combination OCs directly affect the pituitary, increasing PRL and decreasing gonadotropin release.
    • Individual variability in response to OCs exists.
    • These pituitary effects may be linked to the development of post-pill amenorrhea-galactorrhea.