The association of cord serum cytokines with neurodevelopmental outcomes

Area of Science:

• Neonatal Medicine
• Neuroscience
• Immunology

Background:

• Cerebral palsy (CP) and neurodevelopmental delay (NDD) are significant concerns in preterm infants.
• Inflammatory processes in utero are suspected contributors to adverse neurodevelopmental outcomes.
• Umbilical cord serum cytokine levels offer a window into the fetal inflammatory environment.

Purpose of the Study:

• To investigate the predictive value of elevated umbilical cord serum inflammatory cytokine levels for subsequent CP or NDD.
• To determine if specific cytokines, including interleukin-8 (IL-8), interleukin-1 beta (IL-1β), and tumor necrosis factor-alpha (TNF-α), are associated with these outcomes.

Main Methods:

• A nested case-control study was conducted within a clinical trial of antenatal magnesium sulfate (MgSO4) for preterm birth (PTB).
• Cord serum cytokine levels (IL-8, IL-1β, TNF-α) were measured and compared between infants who developed CP/NDD and controls.
• Logistic regression analyses adjusted for confounders including MgSO4 exposure, gestational age, and race.

Main Results:

• Elevated IL-8 and IL-1β levels were initially found more frequently in infants with later low mental developmental index (MDI).
• However, these associations lost statistical significance after adjusting for confounders.
• No significant elevation in IL-8, IL-1β, or TNF-α levels was observed in relation to CP or low psychomotor developmental index (PDI).

Conclusions:

• Umbilical cord serum levels of IL-8, IL-1β, and TNF-α do not appear to be reliable predictors of subsequent cerebral palsy or neurodevelopmental delay in preterm infants.
• The findings suggest that while inflammation may play a role, these specific cord serum cytokines are not directly associated with these adverse outcomes in this population.