Prospects on the nano-plastic particles internalization and induction of cellular response in human keratinocytes
Research Square (Research Square)2020
Score: 30
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Researchers isolated nanoplastic particles from commercial face scrubs and found they were internalized by human skin cells (keratinocytes) through a macropinocytosis pathway, triggering cellular stress responses. The findings raise concerns about dermal exposure to nanoplastics from cosmetic products.
Abstract Background : Today cosmetic usage becomes customary in both sexes to improve their appearance and increase societal visibility. In this study, we have isolated nano-sized plastic particles ranging between 30 to 300 nm from the commercial face-scrubs and investigated its effects on keratinocytes. Results: Initially, nano-plastics adsorbed protein molecules and formed protein corona, thereby mimicked as protein aggregates, which then triggered the macropinocytosis activity. As a result, corrosion and degradation of plastic particles were observed. Concurrently, nano-plastics concentration-dependent cytotoxic, cytostatic, and cytoprotective activities were found in the keratinocytes. Additionally, a single dose of nano-plastics exposure for 48hrs resulted in the ROS mediated down-regulation of cell growth and proliferation inhibition followed by autophagy, finally, premature aging in HaCaT cells in 24 and 72 hrs of post-internalization, respectively. Conclusion: At the outset, this work provides insights into the nano-plastics concentration-dependent regulatory, cytoprotective, and cytotoxic effects in HaCaT cells. Further studies required to identify the detailed mechanisms of NPs toxicity on cells and the cytoprotective effect in cells at the molecular level.