Polytetrafluoroethylene (PTFE, Teflon) microplastics and nanoplastics induce oxidative stress, mitochondrial damage, and genotoxicity in human intestinal cells.
Level 5 - mechanism / opinion, no new human data
In vitro laboratory study using human cell lines.
PubMed 41167152 · doi:10.1016/j.jhazmat.2025.140255
What was done
Researchers exposed human intestinal cell models (Caco-2 monocultures and Caco-2/HT29-MTX co-cultures, both differentiated and undifferentiated) to polytetrafluoroethylene (PTFE, Teflon) microplastics (~2 µm) and nanoplastics (~250 nm). Cells were treated with concentrations of 50 to 200 µg/mL for 24 to 48 hours to evaluate cellular uptake, viability, organelle interaction, oxidative stress, inflammation, and DNA damage.
What was found
The abstract does not provide exact numerical effect sizes or statistical values. It reports that PTFE particles, particularly nanoscale sizes, entered cells and localized near nuclear membranes and mitochondria without significantly reducing cell viability. These interactions caused mitochondrial structural damage, oxidative stress, inflammatory responses, and DNA damage, with effects increasing in severity with particle size, dose, and exposure duration.
Why it matters
These findings challenge the assumption that PTFE wear particles are biologically inert in the gut, indicating that nanoscale Teflon particles can physically disrupt subcellular structures in human intestinal models.
Limits
The study is limited to in vitro cell cultures, which cannot replicate whole-organism digestion, mucosal clearance, or systemic immune responses. The tested concentrations (50–200 µg/mL) and short timeframes (24–48 hours) may not reflect chronic, real-world low-dose dietary ingestion in humans, and precise quantitative metrics are omitted from the abstract.