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Changes in plasma adrenomedullin levels during the menstrual cycle
E Marinoni1, R Di Iorio, C Letizia
1Laboratory of Perinatal Medicine and Molecular Biology, 2nd Institute of Obstetrics and Gynecology, University La Sapienza Viale Regina Elena, Rome, Italy. perinat@flashnet.it
Regulatory Peptides
|March 10, 2000
Summary
Adrenomedullin levels fluctuate during the ovarian cycle, mirroring luteinizing hormone (LH) patterns. These changes correlate with 17beta-estradiol, suggesting a potential role in reproductive feedback or fluid balance.
Area of Science:
- Endocrinology
- Reproductive Biology
- Peptide Hormone Research
Background:
- Adrenomedullin is a peptide hormone produced in various tissues, including the pituitary.
- Its role in the ovarian cycle and reproductive processes is not well understood.
Purpose of the Study:
- To investigate the dynamic changes in plasma adrenomedullin levels throughout the human ovarian cycle.
- To explore the relationship between adrenomedullin, gonadotropins (LH, FSH), and ovarian steroids (estradiol, progesterone).
Main Methods:
- Plasma samples were collected from 13 healthy women at key cycle points (days 7, 14, 21, 28).
- Adrenomedullin 1-52 was quantified using radioimmunoassay (RIA).
- Levels of LH, FSH, 17beta-estradiol, and progesterone were also measured.
Main Results:
- Plasma adrenomedullin concentrations exhibited a cyclical pattern, peaking around day 14 and declining by the menses.
- The adrenomedullin profile closely resembled that of LH.
- Significant correlations were observed between adrenomedullin, LH, and 17beta-estradiol levels.
Conclusions:
- Adrenomedullin levels significantly change during the ovarian cycle, mirroring LH fluctuations.
- The observed correlations suggest adrenomedullin may participate in the regulation of the hypothalamic-pituitary-ovary axis.
- Further research is needed to elucidate adrenomedullin's precise function in reproductive endocrinology or fluid homeostasis during the menstrual cycle.