Altered gene expression in human placenta after suspected preterm labour

Area of Science:

• Reproductive biology
• Maternal-fetal medicine
• Genomics and transcriptomics

Background:

• Suspected preterm labor affects 9% of pregnancies, but most women deliver at term.
• Distinguishing true preterm labor from false alarms is crucial for appropriate management and fetal development assessment.

Purpose of the Study:

• To investigate gene expression patterns of inflammatory markers and angiogenic factors in placental and umbilical cord blood.
• To determine if threatened preterm labor induces biological changes independent of gestational age at delivery.

Main Methods:

• Analysis of placental and umbilical cord blood samples from deliveries following threatened preterm labor (preterm and term) and control term deliveries.
• Quantitative mRNA expression analysis of inflammatory markers (IL6, IFNγ, TNFα) and angiogenic factors (FGF2, PGF, VEGFA, VEGFB, VEGFR1).

Main Results:

• Increased TNFα expression in umbilical cord blood for both preterm and term deliveries after threatened preterm labor.
• Placental samples showed significantly increased TNFα and IL6, and decreased IFNγ expression in threatened preterm labor groups.
• Altered expression of angiogenic factors was observed, though not all reached statistical significance.

Conclusions:

• Threatened preterm labor is associated with placental inflammation, indicated by altered gene expression, irrespective of delivery outcome.
• Changes in angiogenic factor expression suggest broader biological impacts beyond preterm birth.
• The findings indicate that the biological mechanisms of threatened preterm labor affect pregnancies independently of the final gestational age at birth.