Scientists have discovered that placentas from premature births contain significantly higher concentrations of micro and nanoplastics than those from full-term births, raising new concerns about environmental impacts on pregnancy. The findings, presented at the Society for Maternal-Fetal Medicine’s annual meeting, suggest these tiny plastic particles may play a role in premature birth.
Using advanced mass spectrometry, researchers analyzed 175 placentae – 100 from full-term births and 75 from preterm deliveries. The results revealed an unexpected pattern of plastic accumulation in pregnancies ending before 37 weeks.
“Advanced technology now enables us to accurately measure microplastics in ways we haven’t been able to in the past,” says Dr. Kjersti Aagaard, the study’s senior author and research professor at Boston Children’s Hospital and the HCA Institute.
The study’s most striking finding was that preterm placentas showed higher concentrations of these particles than those carried to full term. The levels exceeded those previously detected in human blood, indicating the placenta may act as a collection point for these substances during pregnancy.
“The finding of higher placental concentrations among preterm births was surprising because it was counterintuitive to what you might expect if it was merely a byproduct of the length of time of the pregnancy,” explains lead author Dr. Enrico R. Barrozo from Baylor College of Medicine and Texas Children’s Hospital.
Dr. Aagaard elaborates on this unexpected discovery: “In other words, a preterm delivery not only accumulated more microplastics and nanoplastics in its placenta relative to term, but did so at an earlier time point in the pregnancy. This hints at the possibility that the accumulation plastics could be contributing to the risk and occurrence of preterm birth.”
The implications extend beyond pregnancy complications. “When combined with other recent research, this study adds to the growing body of evidence, ranging from heart disease to potentially stroke, that demonstrates a real risk of exposure to plastics on human health and disease,” Aagaard adds.
Microplastics, defined as particles smaller than 5 millimeters, and nanoplastics, which are invisible to the naked eye, have become ubiquitous environmental contaminants. This research represents the first comprehensive analysis of their presence in human placentae and their potential link to pregnancy outcomes.
The study, supported by multiple research institutions including the National Institutes of Health, opens new avenues for understanding how environmental exposures might influence pregnancy outcomes. The findings appear in the January 2025 issue of Pregnancy, marking a significant contribution to our understanding of environmental factors affecting maternal-fetal health.
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