0
Article ? AI-assigned paper type based on the abstract. Classification may not be perfect — flag errors using the feedback button. Tier 2 ? Original research — experimental, observational, or case-control study. Direct primary evidence. Human Health Effects Nanoplastics Sign in to save

Toxic effects of polystyrene nanoplastics on MDA-MB-231 breast cancer and HFF-2 normal fibroblast cells: viability, cell death, cell cycle and antioxidant enzyme activity

Environmental Sciences Europe 2025 12 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count.
Hanie Sadeghinia, Parichehr Hanachi, Reihaneh Ramezani, Samaneh Karbalaei

Summary

Researchers exposed human breast cancer cells and normal skin cells to polystyrene nanoplastics and found that smaller particles at higher concentrations caused significant cell death through apoptosis (programmed cell death) and reduced the cells' ability to defend against oxidative damage. The dose- and size-dependent toxicity suggests that nanoplastics small enough to enter cells are more biologically harmful than larger particles.

Polymers
Models

Environmental nanoplastics pose a potential health risk due to human exposure, necessitating studies on their cellular effects. This study aims to assess the toxic and antibacterial properties of polystyrene nanoplastics (PS-NH2) on MDA-MB-231 breast cancer cells and HFF-2 fibroblast cells, while also evaluating their oxidative stress responses. Additionally, the study explores the anti-tumor effects and apoptosis induction by PS-NH2. The primary objectives were to determine the cytotoxicity, antibacterial efficacy, and oxidative stress response of PS-NH2 at different concentrations and sizes. The study also aimed to investigate the mechanism of cell death, including apoptosis, necrosis, cell cycle arrest, and changes in antioxidant enzyme activity (SOD and GPx). Nanoplastic properties were characterized using FTIR, FESEM, and zeta potential analysis. Antibacterial effects were assessed using the agar dilution method, while the MTT assay determined cytotoxicity in MDA-MB-231 and HFF-2 cells. Apoptosis, necrosis, cell cycle arrest, and antioxidant enzyme activities (SOD, GPx) were also evaluated. FTIR analysis confirmed the amino-functionalization of PS-NH2 with a wide peak at 3386 cm-1, and zeta potential indicated a neutral charge. PS-NH2 showed no antibacterial activity against E. coli or Staphylococcus aureus at sizes of 90, 200, and 300 nm. Cytotoxicity assays revealed dose-dependent decreases in cell viability for both cell lines. SOD and GPx activity decreased significantly with increasing PS-NH2 concentrations. Both cell lines underwent apoptosis, with cell accumulation in the G1 and sub-G1 phases, indicating apoptotic cell death. PS-NH2 exhibits dose- and size-dependent cytotoxicity in MDA-MB-231 and HFF-2 cells. Smaller particle sizes and higher concentrations of PS-NH2 enhance oxidative stress, leading to apoptosis and cell cycle arrest.

Share this paper