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Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
Published on: November 20, 2015
Prenatal complications are associated with the postnatal airway host response and microbiota in intubated preterm
Brandie D Wagner1, Marci K Sontag2, J Kirk Harris3
1a Department of Biostatistics, Colorado School of Public Health , University of Colorado , Aurora , CO , USA.
Insights
Prenatal events influence preterm infants' airway inflammation and microbes, impacting clinical outcomes. These findings offer new insights into preterm infant health and development.
Area of Science:
- Neonatal immunology
- Microbiome research
- Prematurity studies
Background:
- Preterm infants face significant risks from prenatal events and postnatal complications.
- Airway host response and microbial colonization are critical in neonatal respiratory health.
- Understanding these factors is key to improving outcomes for vulnerable infants.
Purpose of the Study:
- To investigate the links between prenatal occurrences, airway immune responses, and microbial composition in mechanically ventilated preterm infants.
- To correlate these findings with clinical outcomes in the early postnatal period.
Main Methods:
- Analysis of tracheal aspirates from 71 preterm infants (median gestational age 25 weeks) at seven days of age.
- Simultaneous measurement of 12 airway proteins and bacterial identification using 16S rRNA sequencing.
- Unsupervised clustering to define airway protein phenotypes and comparison with antenatal factors, microbial communities, and clinical outcomes.
Main Results:
- Three distinct airway protein profiles were identified: high protein levels, high pro-inflammatory/low anti-inflammatory proteins, and low protein levels.
- Specific antenatal events were associated with each protein profile: antenatal hemorrhage (cluster 1), chorioamnionitis (cluster 2), and preeclampsia (cluster 3).
- Cluster 1, characterized by high protein levels, showed a predominance of Staphylococcus and a relative absence of Ureaplasma, and was associated with higher rates of adverse clinical outcomes.
Conclusions:
- Airway protein profiles at seven days in ventilated preterm infants reflect antenatal events and distinct microbial communities.
- These associations suggest potential mechanisms linking antenatal factors to the progression and outcomes of preterm infants.
- This research may pave the way for novel therapeutic strategies targeting airway responses in preterm neonates.
Purpose:
To prospectively examine the relationship between prenatal events, postnatal airway host response and microbiota, and clinical outcomes.
Materials And Methods:
Tracheal aspirates collected at seven days of age from 71 mechanically ventilated infants (median gestational age (GA), 25 weeks [range 23-28]) were simultaneously processed for a 12-plex protein assay and bacterial identification by 16S rRNA sequencing. Phenotypes were determined by unsupervised clustering of the protein analytes. Subject characteristics, microbial communities and clinical factors and outcomes were compared across the phenotype groups.
Results:
Three clusters were identified: 1 (high protein levels), 2 (high proinflammatory proteins and low anti-inflammatory proteins), and 3 (low protein levels), respectively. Antenatal hemorrhage was most common in cluster 1, while chorioamnionitis characterized cluster 2 and preeclampsia was most prevalent in cluster 3, which was characterized by a predominance of Staphylococcus and relative absence of Ureaplasma. There were higher rates of adverse clinical outcomes in cluster 1.
Conclusions:
Airway protein profiles in seven days old mechanically ventilated preterm infants are associated with important antenatal events and unique airway microbial communities. These relationships may reveal new mechanisms by which antenatal events impact the course and outcomes of preterm infants.
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