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Steroid concentrations in human cervical tissue in relation to cervical ripening
Nihon Sanka Fujinka Gakkai Zasshi
|September 1, 1985
Summary
Cervical ripening at term is linked to higher concentrations of key steroids like estrone (E1) and dehydroepiandrosterone (DHA) in cervical tissue. These steroid levels increase further during labor and after DHA-Sulfate administration.
Area of Science:
- Reproductive Endocrinology
- Obstetrics and Gynecology
Background:
- Cervical ripening is a critical process for vaginal delivery at term.
- The role of local steroid concentrations in cervical ripening remains incompletely understood.
Purpose of the Study:
- To investigate the relationship between steroid concentrations in human cervical tissue and the process of cervical ripening at term.
- To compare steroid profiles in ripened versus non-ripened cervices.
Main Methods:
- Radioimmunoassay (RIA) was used to measure free and conjugated estrone (E1), estradiol (E2), estriol (E3), and dehydroepiandrosterone (DHA) in cervical tissue samples.
- Thirty-four women at 37-41 weeks gestation were divided into two groups based on Bishop's Score (ripened vs. non-ripened cervix).
Main Results:
- Significantly higher concentrations of free E1, conjugated E2, E3, and DHA were observed in ripened cervical tissue (Group A) compared to non-ripened tissue (Group B).
- Steroid concentrations in cervical tissue increased further during labor.
- Administration of dehydroepiandrosterone-sulfate (DHA-S) led to pronounced increases in cervical steroid concentrations.
Conclusions:
- Local steroid concentrations in cervical tissue are closely associated with cervical ripening at term.
- Estrogens (E1, E2, E3) and dehydroepiandrosterone (DHA) play a significant role in the mechanism of cervical ripening.