AIIMS Delhi study shows how air pollutants breach placental barriers and affect foetuses, Pg14

Key Highlights:

• An AIIMS Delhi study, funded by ICMR, revealed the biological pathway of how urban air pollution affects foetuses.
• The research, published in EMBO Molecular Medicine, showed PM2.5 breaches the placental barrier.
• It identified the silencing of IGFBP3, a key foetal growth protein, as the mechanism.
• This leads to restricted foetal growth, low birth weight, and increased risk of preeclampsia.
• The study involved rodent models and 994 women from Delhi (high pollution) and Deoghar (low pollution).

Detailed Insights:

• Environmental pollutants are known to cross the placental barrier, impacting foetal development.
• The study mapped the step-by-step biological pathway through which air pollution causes distress to the placenta and foetus.
• Particulate matter (PM2.5 and PM10) induces oxidative stress and inflammation, impairing foetal development.
• Inhibition of IGFBP3 expression disrupts critical placental processes and embryo growth.
• Delhi women exposed to higher PM2.5 showed a significant risk for low birth weight and preeclampsia.
• Rodent studies demonstrated reduced litter sizes, smaller placentas, and neurological harm in offspring, including impaired motor coordination.
• Future research will investigate transgenerational effects on motor development, IQ, and metabolic disorders.
• Risk mitigation strategies suggested include wearing masks, consuming antioxidant-rich foods, and integrating pollution monitoring into prenatal care.

Scientific/Technical Concepts Involved:

• Placental Barrier: A protective biological membrane that regulates the exchange of nutrients, gases, and waste between the mother and the developing foetus.
• PM2.5 (Particulate Matter 2.5): Fine inhalable atmospheric particulate matter with a diameter of 2.5 micrometers or less, posing significant health risks.
• IGFBP3 (Insulin-like Growth Factor Binding Protein 3): A protein that regulates the bioavailability of insulin-like growth factors, crucial for cell growth, development, and placental function.
• Preeclampsia: A serious pregnancy complication characterized by high blood pressure and signs of damage to other organ systems, most often the liver and kidneys.