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Estrogen and progesterone receptor expression in endometrial polyps
K Mittal1, L Schwartz, S Goswami
1Department of Pathology, New York University Medical Center, New York, USA.
Summary
Endometrial polyps, a cause of abnormal uterine bleeding, may stem from reduced estrogen and progesterone receptor expression in stromal cells. This suggests polyps might be less responsive to hormonal fluctuations.
Area of Science:
- Reproductive Endocrinology
- Gynecologic Pathology
Background:
- Endometrial polyps frequently cause abnormal uterine bleeding.
- The underlying pathogenesis of endometrial polyps remains poorly understood.
Purpose of the Study:
- To investigate the role of estrogen receptors (ERs) and progesterone receptors (PRs) in endometrial polyp development.
- To determine if polyps are associated with localized overexpression of ERs or reduced expression of PRs.
Main Methods:
- Immunohistochemical staining for ERs and PRs was performed on 14 endometrial polyp cases.
- Staining levels and intensity in polyps were compared to normal cycling endometrium present on the same slide.
- Quantitative analysis of positive cell percentages and staining intensity in glandular and stromal compartments.
Main Results:
- Stromal cells in polyps showed significantly lower expression of both ERs and PRs compared to normal endometrium.
- Reduced staining intensity for PRs was observed in polyp stroma, but not for ERs.
- No significant differences in ER or PR expression were found in the glandular cells of polyps versus normal endometrium.
Conclusions:
- Endometrial polyps may arise due to decreased ER and PR expression in stromal cells.
- These receptor-negative stromal cells could render endometrial polyps relatively insensitive to cyclic hormonal changes.
- This finding offers insight into the pathogenesis of abnormal uterine bleeding associated with endometrial polyps.