Production of prostaglandin E2 by human amnion in vitro in response to addition of media conditioned by microorganisms associated with chorioamnionitis and preterm labor

R. F. Lamont, F. Anthony, L. Myatt, L. Booth, P. M. Furr, D. Taylor-Robinson

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

To examine the potential role of bacterial infection in the cause of spontaneous preterm labor, human amnion cells in tissue culture were exposed to medium conditioned by culturing each of 21 microorganisms previously found in association with chorioamnionitis and preterm labor. At a final concentration of 0.1% bacterial conditioned medium, a significant stimulation of prostaglandin E2 production from amnion cells was observed for this range of microorganisms. Conditioned medium obtained from culturing Bacteroides fragilis caused a dose-related increase in prostaglandin production, final concentrations of 0.02% to 0.1% being stimulatory but greater concentrations (0.1% to 10%) causing a progressive inhibition of prostaglandin synthesis. A similar concentration-related response in which stimulation was followed by inhibition occurred on addition of increasing concentrations of phosphilipase A2 to amnion cells. These data suggest that bacterial phospholipase may release arachidonic acid from amnion leading to prostaglandin E2 synthesis, but excessive addition of phospholipase and consequent increased arachidonic acid availability may give rise to substrate inhibition of cyclooxygenase enzyme and inhibit prostaglandin E2 synthesis. Overall it appears that a wide variety of microorganisms associated with preterm labor may secrete phospholipase, which liberates amnion arachidonic acid for conversion to the oxytocic agent prostaglandin E2.

Original languageEnglish (US)
Pages (from-to)819-825
Number of pages7
JournalAmerican Journal of Obstetrics and Gynecology
Volume162
Issue number3
DOIs
StatePublished - Mar 1990

Keywords

  • Prostaglandin E
  • bacterial products
  • chorioamnionitis
  • human amnion
  • preterm labor

ASJC Scopus subject areas

  • Obstetrics and Gynecology

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