Amniotic Fluid Levels of Tumor Necrosis Factor-α and Soluble Tumor Necrosis Factor Receptor 1 Before and After the Onset of Labor in Normal Pregnancies

 

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Abstract

Tumor necrosis factor-α (TNF-α) is present in human placental and uterine cells and promotes the regulation of trophoblast growth and invasion. Tumor necrosis factor receptor 1 (TNF-R1) is a receptor for TNF-α, and soluble TNF-R1 (sTNF-R1) is present in amniotic fluid after receptor shedding. We evaluated whether amniotic fluid TNF-α and sTNF-R1 levels during labor differed from those before the onset of labor in normal pregnancies. This study enrolled 34 Japanese women experiencing normal pregnancies with single fetuses who had no infection. Of these subjects, 17 went into labor and had subsequent term deliveries (the labor group), and the other 17 underwent cesarean section without labor (the nonlabor group). The average gestational age at entry was 38-39 weeks of gestation. Maternal ages and gestational ages did not differ significantly between the two groups. Amniotic fluid was collected and the TNF-α and sTNF-R1 levels were determined by the ELISA method. Each of these levels was compared between the two groups. There was a significant increase in amniotic fluid TNF-α levels in the labor group. However, amniotic fluid sTNF-R1 levels did not differ significantly between the two groups. Amniotic fluid TNF-α may promote the onset of labor at term and/or term labor contributing to subsequent delivery may induce the production and secretion of TNF-α into the amniotic cavity. There was no pregnancy-associated increase in receptor shedding or cell apoptosis at the onset of labor.

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Correspondence

M. HayashiMD, PhD 

Department of Obstetrics and Gynecology

International University of Health and Welfare Atami Hospital

13-1, Higashikaigan-cho

Atami-shi

413-0012 Shizuoka

Japan

Phone: +81/557/81 91 71

Fax: +81/557/83 66 32

Email: mhayashi@lilac.plala.or.jp