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Prostaglandins which are produced from amnionic cells are known to play a major role in uterine contraction and cervical dilatation in human. Recently it is reported that aspirin increases the expression of PGHS-1 and PGHS-2 in trophoblast cells from placenta. We examined here the changes of immunoreactive prostaglandin H synthase (PGHS) level by aspirin in cultured cells from amniotic fluid and human amnionic WISH cells. PMA (10-7 M), an activator of protein kinase C increased the induction of PGHS-2 in both cells with or without fetal calf serum. PGHS-2 protein was also increased significantly by 10-4 M aspirin at 6 hours in both cells in the presence of serum but it was not increased in the absence of serum. The expression of PGHS-1 protein was enhanced by asprin but not by PMA in the absence of serum. Other anti-inflammatory drugs such as acetaminophen, indomethacin, dexame- thasone, and mefenamic acid increased the PGHS-2 protein level in WISH cells. PMA-induced PGHS-2 expression in WISH cells was not decreased by aspirin, on the contrary, the level was increased additively. Our results show that the increased expression of PGHS in amnion cells or other amniotic fluid cells by aspirin and other several anti-inflammatory drugs is through an unidentified effect rather than feedback effect by depletion of prostaglandin.
Acetaminophen ; Amnion* ; Amniotic Fluid ; Aspirin* ; Cell Line* ; Cells, Cultured* ; Cyclooxygenase 2 ; Female ; Humans ; Indomethacin ; Labor Stage, First ; Mefenamic Acid ; Placenta ; Pregnancy ; Prostaglandin-Endoperoxide Synthases* ; Prostaglandins ; Protein Kinase C ; Trophoblasts ; Uterine Contraction

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7.Increased Expression of Prostaglandin H synthase by Aspirin in Cultured Cells from Amnionic Cell Line WISH Cells.

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