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PMMA nanoplastics induce gastric epithelial cellular senescence and cGAS-STING-mediated inflammation via ROS overproduction and NHEJ suppression
Summary
Researchers found that PMMA (acrylic) nanoplastics caused premature aging in stomach lining cells by generating excessive reactive oxygen species and blocking the cells' ability to repair DNA damage. The damaged cells released free DNA fragments that activated inflammatory immune pathways, and mice exposed to the nanoplastics showed behavioral changes associated with aging. This study is notable because most nanoplastic research focuses on polystyrene, and it shows that acrylic nanoplastics can also cause significant harm to the digestive system.
The increasing environmental presence of nanoplastics (NPs) has raised concerns about their potential impact on biological systems. We investigated the repercussions of polymethyl methacrylate (PMMA) NPs exposure on normal gastric epithelial cells and revealed a pronounced increase in senescence-associated β-galactosidase activity and G1 phase cell cycle arrest. Our study demonstrated a dose-dependent increase in reactive oxygen species (ROS) and DNA damage, underscoring the pivotal role of ROS in PMMA NPs-mediated effects, a novel contribution to the existing body of knowledge dominated by polystyrene particles. Furthermore, we explored the influence of PMMA NPs on DNA damage response mechanisms, highlighting the significant inhibition of nonhomologous end-joining (NHEJ). Our findings help to elucidate the consequent genomic instability, as evidenced by increased chromosomal aberrations and micronuclei formation. By connecting these cellular manifestations to organism-level effects, we hypothesize that PMMA NPs play a critical role in aging processes. Our work revealed an activated cGAS-STING signaling pathway after PMMA NPs exposure, which correlated with aging-related inflammation and behavioral changes in mice. Importantly, our study provides comprehensive evidence of PMMA NPs-induced premature aging in gastric epithelial cells, shedding light on the molecular intricacies underlying DNA damage, repair impairment, and inflammation. Our research prompts heightened caution regarding the risks of NPs exposure and calls for further investigation into the broader implications of these environmental pollutants on aging processes in higher organisms.