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Related Experiment Video

Updated: Jun 25, 2025

Mouse Model of Surgically-induced Endometriosis by Auto-transplantation of Uterine Tissue
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Estetrol Inhibits Endometriosis Development in an In Vivo Murine Model.

Ana Sofia Zabala1, Rocío Ayelem Conforti1, María Belén Delsouc1

  • 1Laboratorio de Biología de la Reproducción (LABIR), Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, Instituto Multidisciplinario de Investigaciones Biológicas de San Luis (IMIBIO-SL-CONICET), San Luis D5700HHW, Argentina.

Biomolecules
|May 24, 2024
PubMed
Summary

Estetrol (E4) effectively reduced endometriosis lesion growth in a mouse model by increasing cell death and modulating inflammation. This study shows E4 limits endometriosis progression, offering a potential new therapeutic avenue.

Keywords:
apoptosisendometriosisestetrolhormone receptorsmouse modeloxidative stressproliferation

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Area of Science:

  • Reproductive Endocrinology
  • Gynecological Pathology
  • Pharmacology

Background:

  • Endometriosis involves ectopic endometrial tissue growth, linked to hormone receptor and inflammation changes.
  • Estetrol (E4), a novel weak estrogen, is approved for contraception.

Purpose of the Study:

  • To investigate E4's effects on endometriotic lesion growth and key molecular markers in an in vivo mouse model.
  • To assess E4's impact on tumor necrosis factor-alpha (TNF-α), estrogen receptors (ERs), and progesterone receptors (PRs).

Main Methods:

  • Surgical induction of endometriosis in female C57BL/6 mice.
  • E4 administration via Alzet pump (3 mg/kg/day) for 4 weeks post-surgery.
  • Evaluation of lesion volume, weight, cell proliferation (PCNA), apoptosis (TUNEL), oxidative stress markers, lipid peroxidation, and gene/protein expression (RT-qPCR, ELISA).

Main Results:

  • E4 significantly decreased endometriotic lesion volume and weight.
  • E4 increased cell apoptosis and modulated oxidative stress and lipid peroxidation.
  • E4 reduced TNF-α and Esr2 expression, while increasing Esr1 and Pgr expression.

Conclusions:

  • Estetrol (E4) demonstrated efficacy in limiting the development and progression of endometriosis in vivo.
  • E4's mechanism involves promoting apoptosis, modulating oxidative stress, and altering hormone receptor expression profiles.