Journal of the Society for Gynecologic Investigation

 

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Journal of the Society for Gynecologic Investigation, Vol. 10, No. 3, 158-160 (2003)
DOI: 10.1016/S1071-55760300002-9

Concentrations of Soluble Fas in Maternal Serum and Amniotic Fluid During Uncomplicated Pregnancies

Aradne Malamitsi-Puchner, MD

2nd Department of Obstetrics and Gynecology, University of Athens, 19, Soultani Str., GR-10682 Athens, Greece; geocre{at}aretaieio.uoa.gr

Angeliki Sarandakou, PhD

Vasiliki Papagianni, MD

Efthimia Protonotarious, MD

John Tziotis, MD

Dimitrios Botsis, MD

2nd Department of Obstetrics and Gynaecology, University of Athens, Athens, Greece

Objective: To determine, during normal pregnancy, maternal serum (MS) and anniotic fluid (AF) concentrations of soluble Fas (sFas), an apoptosis-suppressing molecule that might play a role in the apoptotic process. Soluble Fas levels might explain existing immunotolerance, fetal well being, and rupture of membranes at term.

Methods: Sixty-six healthy, nonsmoking, pregnant women (mean age 32.6 ± 4.8 years) with uncomplicated singleton pregnancies (15 in the first trimester, 30 in the second trimeste, and 21 at term vaginal delivery) and 20 healthy nonpregnant women (mean age 32.5 ± 3.8 years) were included in the study. MS and AF sFas concentrations were measured by a sandwich enzyme-linked immunosorbent assay, and parametric tests were used in the statistical analysis.

Results: MS and AF sFas concentrations significantly depended on gestational age (P < .0008 and P < .0002, respectively). MS concentratiosn were significantly lower in the first trimester than those in the second trimester (P < .003), those at term (P < .03), and those in nonpregnant controls (P < .005). AF concentrations decreased significantly at term compared with those in the second trimester (P < .0003). AF sFas concentrations in the second trimester and at term were significantly lower than respective MS concentrations (P < .00001).

Conclusions: MS sFas concentrations decreased significantly in the first trimester of pregnancy, possibly affecting semiallograft tolerance. In the second trimester, concentrations return to control levels and remain unchanged until delivery. AF sFas concentrations decrease at term compared with the second trimester, possibly indicating increased apoptosis in preparation for rupture of membranes.

Key Words: sFas • first and second trimester of pregnancy • delivery at term • maternal serum • amniotic fluid


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