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Preterm delivery is often associated with increased cytokine and chemokine production. These studies characterize the expression of the chemokine monocyte chemotactic protein-1 (MCP-1) in mice during lipopolysaccharide (LPS)-induced preterm delivery. Uterine and other tissues were harvested from CD-1 mice on gestational day 15 after intrauterine LPS injection. Quantitative real-time reverse-transcriptase polymerase chain reactions determined MCP-1 and toll-like receptor 4 (TLR4) mRNA expression during the 24 hours after LPS. MCP-1 protein expression was determined using a cytokine/chemokine protein array, enzyme-linked immunosorbant assay, and immunohistochemistry. Intrauterine LPS injection caused preterm delivery in CD-1 mice between 12 and 24 hours. Expression of MCP-1 mRNA significantly increased at 2 and 6 hours, while TLR4 expression did not significantly change over 24 hours. The MCP-1 protein levels peaked by 2 to 6 hours in maternal serum, liver, lung, kidney, and uterus. Immunohistochemistry confirmed MCP-1 in the myometrium and endometrium. These studies provide evidence suggesting that MCP-1 potentially plays an important role during the proinflammatory immune response, leading to preterm labor in the mouse.

Modulation of Monocyte Chemotactic Protein-1 Expression During Lipopolysaccharide-Induced Preterm Delivery in the Pregnant Mouse