[HTML][HTML] Pulmonary and systemic expression of monocyte chemotactic proteins in preterm sheep fetuses exposed to lipopolysaccharide-induced chorioamnionitis

TA Shah, NH Hillman, I Nitsos, GR Polglase… - Pediatric …, 2010 - nature.com
TA Shah, NH Hillman, I Nitsos, GR Polglase, J Jane Pillow, JP Newnham, AH Jobe…
Pediatric research, 2010nature.com
Monocyte chemoattractant proteins (MCP-1 and MCP-2) mediate monocyte and T-
lymphocyte chemotaxis, and IL-1 contributes to the pathogenesis of chorioamnionitis-
induced lung inflammation and fetal inflammatory responses. We tested the hypothesis that
IL-1 mediates the systemic and pulmonary induction of MCP-1 and MCP-2 in response to
lipopolysaccharide (LPS)-induced chorioamnionitis. MCP-1 mRNA, MCP-2 mRNA, and
MCP-1 protein expression were measured in two models: 1) intra-amniotic LPS and 2) intra …
Abstract
Monocyte chemoattractant proteins (MCP-1 and MCP-2) mediate monocyte and T-lymphocyte chemotaxis, and IL-1 contributes to the pathogenesis of chorioamnionitis-induced lung inflammation and fetal inflammatory responses. We tested the hypothesis that IL-1 mediates the systemic and pulmonary induction of MCP-1 and MCP-2 in response to lipopolysaccharide (LPS)-induced chorioamnionitis. MCP-1 mRNA, MCP-2 mRNA, and MCP-1 protein expression were measured in two models: 1) intra-amniotic LPS and 2) intra-amniotic recombinant sheep IL-1α given at varying intervals before preterm delivery at 124 d GA. Intra-amniotic LPS or IL-1α induced MCP-1 mRNA and protein and MCP-2 mRNA in fetal lung many fold at 1–2 d. LPS induced intense MCP-1 expression in subepithelial mesenchymal cells and interstitial inflammatory cells in the lung. Inhibition of IL-1 signaling with recombinant human IL-1 receptor antagonist (rhIL-1ra) did not attenuate LPS induced increase in MCP-1 or MCP-2 expression. MCP-1 and MCP-2 were not induced in liver or chorioamnion, but MCP-1 increased in cord plasma. LPS or IL-1 can induce robust expression of MCP-1 or MCP-2 in the fetal lung. LPS induction of MCP-1 is not IL-1 dependent in fetal sheep. MCP-1 and MCP-2 may be significant contributors to fetal inflammation.
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