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Reproductive Sciences

, Volume 18, Issue 11, pp 1092–1102 | Cite as

Interleukin-1 in Lipopolysaccharide Induced Chorioamnionitis in the Fetal Sheep

  • Clare A. Berry
  • Ilias Nitsos
  • Noah H. Hillman
  • J. Jane Pillow
  • Graeme R. Polglase
  • Boris W. Kramer
  • Matthew W. Kemp
  • John P. Newnham
  • Alan H. Jobe
  • Suhas G. KallapurEmail author
Original Articles

Abstract

We tested the hypothesis that interleukin 1 (IL-1) mediates intra-amniotic lipopolysaccharide (LPS)-induced chorioamnionitis in preterm fetal sheep. Time-mated Merinoewes with singleton fetuses received IL-1α, LPS, or saline (control) by intra-amniotic injection 1 to 2 days before operative delivery at 124 ± 1 days gestational age (N = 5-9/group; term = 150 days). Recombinant human IL-1 receptor antagonist (rhIL-1ra) was given into the amniotic fluid 3 hours before intra-amniotic LPS or saline to block IL-1 signaling. Inflammation in the chorioamnion was determined by histology, cytokine messenger RNA (mRNA), protein expression, and by quantitation of activated inflammatory cells. Intra-amniotic IL-1 and LPS both induced chorioamnionitis. However, IL-1 blockade with IL-1ra did not decrease intra-amniotic LPS-induced increases in pro-inflammatory cytokine mRNAs, numbers of inflammatory cells, myeloperoxidase, or monocyte chemotactic protein-1-expressing cells in the chorioamnion. We conclude that IL-1 and LPS both can cause chorioamnionitis, but IL-1 is not an important mediator of LPS-induced chorioamnionitis in fetal sheep.

Keywords

fetal inflammatory response syndrome prematurity innate immunity IL-1 receptor antagonist 

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Copyright information

© Society for Reproductive Investigation 2011

Authors and Affiliations

  • Clare A. Berry
    • 1
  • Ilias Nitsos
    • 2
  • Noah H. Hillman
    • 1
  • J. Jane Pillow
    • 2
  • Graeme R. Polglase
    • 2
  • Boris W. Kramer
    • 3
  • Matthew W. Kemp
    • 2
  • John P. Newnham
    • 2
  • Alan H. Jobe
    • 1
    • 2
  • Suhas G. Kallapur
    • 1
    • 2
    Email author
  1. 1.Division of Pulmonary Biology/NeonatologyCincinnati Children’s Hospital Medical CenterCincinnatiUSA
  2. 2.School of Women’s and Infants’ HealthThe University of Western AustraliaPerthAustralia
  3. 3.Department of Paediatrics, School of Oncology and Developmental BiologyMaastricht University Medical CenterMaastrichtThe Netherlands

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