Immune profiling of BALB/C and C57BL/6 mice reveals a correlation between Ureaplasma parvum-Induced fetal inflammatory response syndrome-like pathology and increased placental expression of TLR2 and CD14.

Am J Reprod Immunol

Department of Infectious Diseases and Pathology and the D. H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, FL, USA.

Published: March 2014

Problem: Both BALB/c and C57BL/6 mice are susceptible to intrauterine infection with Ureaplasma parvum, but only protypical TH2/M2 BALB/c mice develop severe chorioamnionitis, fetal infection, and fetal inflammatory response syndrome-like (FIRS) pathology.

Method Of Study: Microscopy, gene expression analysis, and ELISA were used to identify placental innate immune responses relevant to macrophage polarity, severe chorioamnionitis, and fetal infection.

Results: Both mouse strains exhibited a pro-M2 cytokine profile at the maternal/fetal interface. In BALB/c mice, expression of CD14 and TLRs 1, 2, 6 was increased in infected placentas; TLR2 and CD14 were localized to neutrophils. Increased TLR2/CD14 was also observed in BALB/c syncytiotrophoblasts in tissues with pathological evidence of FIRS. In contrast, expression in C57BL/6 placentas was either unchanged or down-regulated.

Conclusion: Our findings show a link between increased syncytiotrophoblast expression of CD14/TLR2 and FIRS-like pathology in BALB/c mice. Functional studies are required to determine if CD14 is contributing to fetal morbidity during chorioamnionitis.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3927638PMC
http://dx.doi.org/10.1111/aji.12192DOI Listing

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