Molecular Human Reproduction, Vol. 5, No. 4, 372-375,
April 1999
© 1999 European Society of Human Reproduction and Embryology
Relaxin stimulates glycodelin mRNA and protein concentrations in human endometrial glandular epithelial cells
1 Department of Obstetrics/Gynecology and Reproductive Medicine, State University of New York at Stony Brook, Stony Brook, New York, 11794, USA, and 2 Department of Obstetrics/Gynecology, Helsinki University Central Hospital, Helsinki, Finland
Human endometrium is the major organ that produces glycodelin A (GdA). The production of endometrial GdA causes a fluctuation of the peripheral glycodelin concentrations in women during the menstrual cycle and pregnancy. It has recently been reported that the rise of plasma concentrations of glycodelin is correlated with relaxin during the late luteal phase and early pregnancy. In addition, administration of relaxin increases glycodelin plasma concentrations, suggesting that relaxin induces GdA production in endometrium. To investigate whether relaxin regulates the GdA synthesis, human endometrial glandular epithelial cells were isolated and cultured with or without relaxin for up to 4 days. Western blot showed that GdA synthesized and secreted from epithelial glands had a major molecular weight of 28 kDa, i.e. the same as the GdA isolated from amniotic fluid. Cells incubated with relaxin consistently increased in GdA production rate (2–6-fold). The GdA mRNA concentrations increased 2–11-fold in cells incubated with relaxin for 2–4 days, as determined by solution hybridization/ribonuclease protection assay. The increase of the mRNA concentration indicates that relaxin activates GdA transcription.
endometrium/glycodelin/relaxin
3 To whom correspondence should be addressed
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