Impact of prenatal micro/nanoplastics exposure on intrauterine development and growth: a systematic review

Micro- and nanoplastics (MNPs) pollution has become a global environmental concern due to its widespread presence and diverse sources. These tiny plastic particles, originating from industrial processes, plastic waste degradation, and consumer products, have infiltrated various ecosystems, food chains, and even human tissues. Recent studies indicate that MNPs are not only pervasive in air, water, and soil but also accumulate in the human body through ingestion, inhalation, and dermal exposure. However, the implications of MNPs exposure, particularly during pregnancy, remain poorly understood. Of critical concern is the potential transfer of MNPs and their associated chemical additives across the placental barrier, posing risks to fetal development. In this review, we comprehensively analyze mainstream technologies used for detecting and characterizing MNPs, including spectroscopy- and microscopy-based approaches, as well as emerging detection methods. We also examine recent findings on the toxicity of MNP-associated chemicals, such as endocrine-disrupting compounds and heavy metals, which may have long-term effects on human health. Particular emphasis is placed on how maternal exposure to MNPs could impact offspring development, potentially leading to neurodevelopmental disorders, metabolic disturbances, and immune system dysregulation. Despite growing concerns, research gaps persist regarding the precise mechanisms through which MNPs influence maternal and fetal health. The findings recommend for further multidisciplinary research to assess the long-term consequences of prenatal MNPs exposure. Addressing these uncertainties is crucial for informing public health policies, mitigating risks, and ensuring the well-being of pregnant women and future generations.