151. Cyclic AMP in human preterm infant blood is associated with increased TLR-mediated production of acute-phase and anti-inflammatory cytokines in vitro.
- Author
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Strunk T, van Haren SD, Hibbert J, Pettengill M, Ozonoff A, Jans J, Schüller SS, Burgner D, Levy O, and Currie AJ
- Subjects
- Cells, Cultured, Chorioamnionitis immunology, Diglycerides pharmacology, Female, Fetal Blood immunology, Gestational Age, Humans, Infant, Newborn, Infant, Premature immunology, Leukocytes drug effects, Leukocytes immunology, Lipopolysaccharides pharmacology, Longitudinal Studies, Male, Oligopeptides pharmacology, Pregnancy, Prospective Studies, Toll-Like Receptors agonists, Chorioamnionitis blood, Cyclic AMP blood, Cytokines blood, Fetal Blood metabolism, Infant, Premature blood, Inflammation Mediators blood, Leukocytes metabolism, Toll-Like Receptors blood
- Abstract
Background: Preterm infants are at high risk of infection and have distinct pathogen recognition responses. Suggested mechanisms include soluble mediators that enhance cellular levels of cAMP. The aim of this study was to assess the relationship between blood cAMP concentrations and TLR-mediated cytokine production in infants during the first month of life., Methods: Cord and serial peripheral blood samples (days of life 1-28) were obtained from a cohort of very preterm (<30 weeks' gestational age) and term human infants. Whole-blood concentrations of cAMP and FSL-1 and LPS in vitro stimulated cytokine concentrations were measured by ELISA and multiplex bead assay., Results: cAMP concentrations were higher in cord than in peripheral blood, higher in cord blood of female preterm infants, and lower at Days 1 and 7 in infants exposed to chorioamnionitis, even after adjusting for leukocyte counts. TLR2 and TLR4-mediated TNF-α, IL-1β, IL-6, IL-12p70, and IL-10 production in vitro increased over the first month of life in preterm infants and were positively correlated with leukocyte-adjusted cAMP levels and reduced by exposure to chorioamnionitis., Conclusions: The ontogeny of blood cAMP concentrations and associations with chorioamnionitis and TLR-mediated production of cytokines suggest that this secondary messenger helps shape distinct neonatal pathogen responses in early life.
- Published
- 2020
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