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Synergistic effects of parabens and plastic nanoparticles on proliferation of human breast cancer cells
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Parabens (common preservatives in personal care products) combined with plastic nanoparticles were found to have synergistic effects on the proliferation of human breast cancer cells, with the combination being more stimulating than either substance alone. This finding raises concerns about cumulative endocrine disruption from combined exposure to plastics and cosmetic chemicals.
Many personal care products on the market contain endocrine disrupting chemicals, including parabens. Parabens are well known chemical additives used as preservatives. They have been found in mammary glands and breast cancer tissues. At the same time, the general public is increasingly exposed to plastic micro- and nanoparticles generated during plastic production and waste disposal. Exposure to chemical cocktails is a realistic scenario of high public health interest, in which many types of compounds such as these two may exhibit synergistic or additive adverse effects. This study evaluated the effects of plastic nanoparticles, parabens, and their mixture on the viability and proliferation of two human breast cancer cell lines: MDA-MB 231, which lacks oestrogen receptors, and MCF-7, which expresses these receptors. Parabens increased proliferation of oestrogen-sensitive breast cancer cells, and this effect became synergistic in the presence of plastic nanoparticles. The mechanism behind synergy may be related to the translocation and adsorption properties of nanoplastics, which served as a Trojan horse to expose cells to parabens more efficiently. These preliminary findings support growing evidence warning about the urgent problem of human exposure to combinations of plastic waste and contingent chemicals.
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Researchers tested the cytotoxic effects of methyl paraben (a preservative) and dibutyl phthalate (a plasticizer) individually and in binary mixtures on human skin cells, finding that combined exposure altered toxicity compared to single-compound effects. The results show that mixture interactions between these common chemical contaminants complicate risk assessment based on individual exposures.
Single and joint exposure to nanoplastics and bisphenols: a comparative assessment of in vitro hazards
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This study compared the individual and combined toxicity of nanoplastics and bisphenol compounds in biological test systems, finding synergistic effects at certain exposure combinations. The results indicate that co-exposure to these two common plastic-associated contaminants may be more harmful than either alone.
Cytotoxicity of nanomixture: Combined action of silver and plastic nanoparticles on immortalized human lymphocytes.
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Human lymphocyte cells exposed to a mixture of silver nanoparticles and polystyrene nanoplastics showed greater cytotoxicity than cells exposed to either material alone, indicating synergistic toxicity. The findings are relevant to human health because both types of nanoparticles are increasingly present in the environment and in consumer products.
Co-exposure to polystyrene nanoplastics and triclosan induces synergistic cytotoxicity in human KGN granulosa cells by promoting reactive oxygen species accumulation
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Researchers found that when human ovarian cells are exposed to both nanoplastics and triclosan (a common antibacterial chemical) at the same time, the toxic effects are worse than either one alone. The combination triggered more cell damage, harmful oxygen molecules, and cell death than individual exposure. This matters because people are typically exposed to multiple pollutants simultaneously, and this synergy could have implications for female reproductive health.
Nanoplastics and Arsenic Co-Exposures Exacerbate Oncogenic Biomarkers Under an in Vitro Long-Term Exposure Scenario
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This lab study examined whether nanoplastics combined with arsenic — a naturally occurring toxic element — had greater cancer-promoting effects than either contaminant alone. The combination worsened multiple cancer-related biomarkers in human cells over long-term exposure. The findings raise concerns about the health consequences of nanoplastic exposure in environments where multiple pollutants are present simultaneously.
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