Amniotic fluid metabolomic analysis in spontaneous preterm birth

Area of Science:

• Biochemistry
• Metabolomics
• Reproductive Medicine

Background:

• Spontaneous preterm birth (PTB) is a leading cause of neonatal morbidity and mortality.
• Identifying biomarkers for PTB is crucial for timely intervention.
• Metabolomic analysis of amniotic fluid offers a window into fetal metabolic status.

Purpose of the Study:

• To investigate metabolic alterations in amniotic fluid associated with spontaneous preterm birth (<34 weeks) versus term births in an African American population.
• To utilize high-throughput metabolomics for comprehensive metabolic profiling.

Main Methods:

• Amniotic fluid samples were collected from spontaneous PTB (n=25) and term birth (n=25) groups.
• Gas chromatography/mass spectrometry and liquid chromatography/mass spectrometry/mass spectrometry were employed for metabolomics analysis.
• Statistical analyses, including t-tests and false discovery rate corrections, identified differentially regulated metabolites, controlling for clinical variables.

Main Results:

• Out of 348 metabolites, 121 showed gestational age effects and 116 differed significantly between PTB and term births.
• Key altered metabolic categories included liver function, fatty acid and coenzyme A (CoA) metabolism, and histidine metabolism.
• Pantothenol, a CoA synthesis inhibitor, was 8-fold more abundant in PTB, indicating altered liver function and xenobiotic detoxification pathways.

Conclusions:

• Global metabolic profiling of amniotic fluid reveals significant alterations in hepatic metabolites, xenobiotic detoxification, and CoA metabolism in spontaneous preterm birth.
• These metabolic changes suggest potential developmental differences in maternal and/or fetal hepatic function.
• The causal role of these hepatic function differences in PTB requires further investigation.