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Inhibin in normal and abnormal pregnancy: maternal serum concentration and partial characterization
A Khalil1, R C Kaufmann, J Wortsman
1Department of Obstetrics and Gynecology, Southern Illinois University, School of Medicine, Springfield 62794-9230.
American Journal of Obstetrics and Gynecology
|March 1, 1995
Summary
Maternal serum inhibin levels, a key pregnancy hormone, vary with gestational age, fetal sex, and pregnancy complications. Most inhibin in maternal blood is a large-molecular-weight form.
Area of Science:
- Reproductive endocrinology
- Maternal-fetal medicine
- Biochemistry
Background:
- Inhibin is a key hormone in reproductive physiology.
- Understanding inhibin's role in pregnancy is crucial for monitoring fetal development and identifying potential complications.
Purpose of the Study:
- To evaluate maternal serum inhibin concentration.
- To analyze the molecular distribution of inhibin in normal and abnormal pregnancies.
Main Methods:
- Radioimmunoassay (RIA) was used to measure serum inhibin levels.
- 33 abnormal pregnancies and 33 matched controls were analyzed.
- Gel filtration chromatography was employed to determine molecular weight.
Main Results:
- Serum inhibin increased with gestational age and was higher with female fetuses in controls.
- Abnormal singleton pregnancies showed significantly higher inhibin levels than controls.
- Multiple gestations exhibited a more rapid increase in inhibin with gestational age.
Conclusions:
- Maternal serum inhibin is influenced by gestational age, fetal gender, and pregnancy complications.
- The predominant form of immunoreactive inhibin in maternal circulation is a large-molecular-weight form (55-60 kd).