P2.G131: Inter-alpha Inhibitors in Neonatal Encephalopathy: Inflammatory-Mediated Reductions in Cord Blood Levels.

Background: Inter-alpha Inhibitor Proteins (IAIPs) are structurally related proteins found in the systemic circulation with immunomodulatory anti-inflammatory properties. Reduced levels are found in inflammatory related conditions including sepsis and necrotizing enterocolitis, and in neonatal rodents after exposure to hypoxia ischemia. In the current study, cord blood IAIP levels were measured in neonates with and without hypoxic-ischemic encephalopathy (HIE).

Methods: This is a prospective cohort study including infants born ≥36 weeks over a one-year period. Term pregnancies were divided into two groups: a “reference control” (uncomplicated term deliveries), and “moderate to severe HIE” (qualifying for therapeutic hypothermia). IAIPs were quantified using a sensitive ELISA on the cord blood samples.

Results: The study included 57 newborns: Reference control group (n=13) and moderate/severe HIE group (n=44). Measurement of IAIP cord blood concentrations in moderate to severe HIE group [278.2 (138.0, 366.0) µg/ml] revealed significantly lower IAIP concentrations compared with the control group [418.6 (384.5, 445.0) µg/ml] (p= 0.002).

Conclusion: These findings suggest a potential role for IAIPs as biomarkers to identify neonates at risk for HIE. IAIP levels could have diagnostic implications in the management of HIE. Future research is required to explore the relationship between HIE and IAIPs as biomarkers for disease severity.