We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Dose- and Time-Dependent Cytotoxic Effects of Coffee Cup Lid-Derived Polystyrene Microplastics on CHO Cells: A Preliminary in Vitro Study
AI summary Read the abstract
Scientists ground up real coffee cup lids to create microplastic particles and tested how they affected cells in a lab dish. The longer the cells were exposed and the higher the dose, the more harmful the microplastics became, but this was an early, lab-only study using animal cells, not human cells or people, so it can't yet tell us what happens when we actually drink from these lids. Still, it's a signal that everyday plastic products deserve closer study when it comes to potential health effects.
Microplastics from everyday plastic products are a growing concern because of their potential biological effects and relevance to human exposure. Although spherical particles are widely used in studies, particles generated from real-world plastic materials may offer a more realistic model of environmental and consumer-related exposure. This study aimed to evaluate the dose- and time-dependent cytotoxic effects of coffee cup lid-derived polystyrene microplastics (PSMPs) on Chinese hamster ovary (CHO) cells. Polystyrene microplastics were produced from coffee cup lids by mechanical processing, followed by homogenization, drying, and suspension in cell culture medium. CHO cells were exposed to microplastic concentrations of 5, 10, 15, 20, 25, 50, 100, 250, 500, and 1000 µg/mL for 24, 48, and 72 hours. Cell viability was assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, and the effects of concentration and exposure duration were evaluated statistically. Coffee cup lid-derived PSMPs reduced CHO cell viability in a dose- and time-dependent manner. The IC50 value was not reached within the tested concentration range after 24 h and was therefore reported as >1000 µg/mL, whereas the estimated IC50 values were approximately 250 µg/mL after 48 h and approximately 94.4 µg/mL after 72 h. Prolonged exposure resulted in a pronounced reduction in cell viability, particularly at higher concentrations. These results suggest that PSMPs obtained from daily-use coffee cup lids may produce increasingly pronounced cytotoxic responses under prolonged in vitro exposure. However, further studies incorporating particle characterization, additional mechanistic endpoints, and human-relevant cell models are needed to clarify the biological significance of these findings.
More Papers Like This
Exposure of microplastic at levels relevant for human health : cytotoxicity and cellular localization of polystyrene microparticles in four human cell lines
AI summary Read the abstract
Researchers tested the cytotoxicity of polystyrene microplastics on four human cell lines at concentrations relevant to real-world human exposure from food, water, and packaging. At environmentally realistic doses, microplastics were taken up by cells but did not cause significant toxicity, though higher concentrations did produce cell damage, suggesting that current exposure levels may be near a threshold of concern.
Comparative toxicity of microplastics obtained from human consumer products on human cell-based models
AI summary Read the abstract
Researchers tested microplastics ground from everyday consumer plastic products, like forks and cups, on eight different human cell types and found that certain cells were notably vulnerable. Endothelial cells and microglial cells showed decreased viability and DNA damage at concentrations as low as 10 micrograms per milliliter. The study suggests that microplastics from real consumer products may pose different risks than the pristine laboratory polymers typically used in toxicity research.
in vitro Chemical and physical toxicity of polystyrene microplastics in human-derived cells
AI summary Read the abstract
Lab experiments exposing human-derived cells to irregularly shaped polystyrene microplastics — which more closely resemble environmentally weathered particles — found dose-dependent cytotoxicity. The study suggests that the shapes of microplastics matter for their toxicity, and that research using only smooth spherical beads may underestimate real-world risks.
A rapid review and meta-regression analyses of the toxicological impacts of microplastic exposure in human cells
AI summary Read the abstract
Researchers conducted a systematic review and statistical analysis of studies examining the effects of microplastic exposure on human cells in the laboratory. They found evidence that microplastics can cause cell damage, inflammation, and oxidative stress, with smaller particles and higher doses generally producing stronger effects. The study provides the first pooled estimate of dose-response thresholds for microplastic toxicity in human cells, helping to frame the potential health risks of daily exposure.
Cytotoxic Effects of Microplastics on Human Cells
AI summary Read the abstract
This study reviewed and tested the cytotoxic effects of microplastics on human cells, finding that microplastic particles can cause cell damage, inflammation, and oxidative stress at relevant concentrations. The results support growing concern that microplastics ingested or inhaled by humans may pose direct health risks at the cellular level.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.