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Estrogen synthesis in normal and malignant human endometrium

L Tseng, J Mazella, W J Mann

    The Journal of Clinical Endocrinology and Metabolism
    |November 1, 1982
    PubMed
    Summary
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    Human endometrium synthesizes estrogen from testosterone, with higher aromatase activity in the proliferative phase. This estrogen production in endometrial cancer may fuel tumor growth.

    Area of Science:

    • Endocrinology
    • Reproductive Biology
    • Oncology

    Background:

    • The human endometrium's capacity to synthesize estrogen from androgens is not fully understood.
    • Estrogen plays a critical role in endometrial physiology and pathology, including cancer development.

    Purpose of the Study:

    • To investigate the ability of human endometrium to synthesize estrogen from testosterone.
    • To determine if endometrial aromatase activity differs between menstrual cycle phases and in cancer.

    Main Methods:

    • Incubation of normal and malignant endometrial specimens with radiolabeled testosterone ([3H]T).
    • Isolation and quantification of various estrogens (estrone, estradiol, and their sulfates) from tissue and medium.
    • Measurement of aromatase activity expressed as pmol of estrogen formed per gram of tissue.
    Keywords:
    BiologyEndocrine SystemEndometriumEstradiolEstrogens--analysisEstroneExaminations And DiagnosesGenitaliaGenitalia, FemaleHistologyHormonesLaboratory Examinations And DiagnosesLaboratory ProceduresPhysiologyUrogenital SystemUterus

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    Main Results:

    • Human endometrium demonstrated the capacity to synthesize estrogens from testosterone at physiological concentrations.
    • Aromatase activity was significantly higher in proliferative endometria compared to secretory endometria.
    • Endometrial cancer specimens exhibited variable estrogen production, with some showing high levels.

    Conclusions:

    • This study provides the first evidence of estrogen synthesis from androgens in the human endometrium.
    • Endometrial estrogen synthesis appears to be hormonally regulated, varying with the menstrual cycle.
    • The presence of aromatase in endometrial cancer suggests a potential role in promoting estrogen-sensitive tumor growth.