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Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
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Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice

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Diversity in cytokine response to bacteria associated with preterm birth by fetal membranes

Ramkumar Menon1, Morgan R Peltier, Judith Eckardt

  • 1Perinatal Research Center, Centennial Women's Hospital, Nashville, TN, USA. rmenon3@emory.edu

American Journal of Obstetrics and Gynecology
|September 8, 2009
PubMed
Abstract

Insights

Bacterial infections trigger distinct fetal membrane responses, influencing preterm birth (PTB). Different bacteria like E. coli and GBS elicit unique cytokine and prostaglandin profiles, indicating varied mechanisms in PTB pathogenesis.

Area of Science:

  • Reproductive Immunology
  • Maternal-Fetal Medicine
  • Microbiology

Background:

  • Preterm birth (PTB) is a leading cause of neonatal morbidity and mortality.
  • Intrauterine infection is a significant contributor to PTB.
  • The specific inflammatory pathways activated by different bacteria in fetal membranes are not fully understood.

Purpose of the Study:

  • To compare the cytokine and prostaglandin (PG) responses of fetal membranes stimulated by four distinct bacterial species commonly associated with PTB.
  • To elucidate the differential inflammatory signatures induced by Ureaplasma parvum, Gardnerella vaginalis, Escherichia coli, and Group B Streptococcus (GBS).

Main Methods:

  • An organ explant system using human fetal membranes (n=13) from uncomplicated term cesarean sections was employed.
  • Explants were stimulated with heat-killed Ureaplasma parvum, Gardnerella vaginalis, Escherichia coli, Group B Streptococcus (GBS), or lipopolysaccharide (LPS).
  • Concentrations of key cytokines (IL-1β, IL-6, IL-8, IL-10, TNF-α, IFN-γ) and prostaglandins (PGF2α, PGE2) were measured and compared.

Main Results:

  • Lipopolysaccharide (LPS) and E. coli induced significant increases in all measured cytokines and prostaglandins.
  • Gardnerella vaginalis and GBS elicited similar cytokine profiles, with G. vaginalis increasing PGE2 and GBS increasing PGF2α.
  • Ureaplasma parvum showed the mildest response, with only IL-10 and TNF-α significantly elevated and no detectable effect on prostaglandins.

Conclusions:

  • The cytokine profiles of fetal membranes stimulated by different bacteria associated with PTB are distinct.
  • These findings suggest that bacterial infection as a cause of PTB is not a homogeneous process.
  • Understanding these differential responses may lead to targeted therapeutic strategies for preventing infection-associated PTB.

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