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Polyethylene terephthalate micro-/nanoplastics suppress SAT1-dependent ferroptosis in triple-negative breast cancer
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Scientists found tiny plastic particles from PET (a common plastic used in bottles and packaging) inside human breast cancer tissue, and discovered these particles may help aggressive "triple-negative" breast cancer cells survive and grow faster. The plastic appears to block a natural cell-death process that normally helps kill off cancer cells, essentially giving tumors a survival advantage. While this research was done in cells and mice, it adds to growing evidence that the microplastics we're exposed to daily may not just be inert particles passing through our bodies, they could actively influence cancer progression.
Background The potential association between micro-/nanoplastics and cancer has raised increasing concerns. However, research focusing specifically on breast cancer (BC), and particularly on triple-negative breast cancer (TNBC), remains limited, leading to a critical gap in current knowledge. This study seeks to explore potential correlative effects of micro-/nanoplastic exposure on TNBC progression. Methods We employed scanning electron microscopy, micro-Raman spectroscopy, and pyrolysis–gas chromatography-mass spectrometry to characterize micro-/nanoplastics in BC tissues. Moreover, spatial transcriptomics (ST) analysis was applied to characterize putative molecular changes associated with polyethylene terephthalate (PET) micro-/nanoplastic exposure and TNBC progression, followed by in vitro and in vivo assays to further investigate these changes. Results A variety of micro-/nanoplastics were detected in human BC tissues. Among them, based on the results of the ST analysis, PET might be related to the downregulation of spermine/spermidine N1-acetyltransferase 1 (SAT1) in TNBC tumor cells and the inhibition of ferroptosis. Moreover, in vitro and in vivo data showed that, following PET treatment, SAT1 expression and ferroptosis were significantly downregulated, whereas TNBC cell proliferation and xenograft growth were significantly upregulated. Additionally, in vitro experiments further suggested that PET micro-/nanoplastics could interact with BC cells via particle endocytosis or surface adsorption. Conclusions This study suggests that SAT1-dependent ferroptosis may be a potential molecular pathway that links PET micro/nanoplastic exposure to TNBC progression. This finding provides novel insights into the possible toxicological association between micro-/nanoplastic exposure and TNBC progression.
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Scientists studying breast cancer tissue found tiny plastic particles—from things like packaging and rubber—in every single tumor sample they examined, and some types of these plastics showed up in higher amounts in the cancerous tissue compared to the healthy tissue right next to it. This is a small early study (only 8 patients), so it can't prove plastics cause cancer, but it raises important questions about whether the microplastics we're constantly exposed to in daily life might be settling in our bodies in ways that matter for our health.
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Researchers found that polypropylene microplastics, one of the most common types found in human tissue, promoted the spread and invasion of human breast cancer cells in laboratory experiments. The microplastics activated specific signaling pathways that help cancer cells migrate to other parts of the body. While this is a lab study and not proof that microplastics cause cancer in people, it raises important questions about how chronic microplastic exposure might influence cancer progression.
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Researchers tested whether tiny nanoplastic particles from common PET plastic bottles could promote cancer development in lab cells. They found that PET nanoplastics acted as a tumor promoter, meaning they helped already-damaged cells grow into cancerous ones, even though a "biodegradable" alternative (polylactic acid) did not show the same effect. This raises concerns about long-term cancer risks from the nanoplastic particles that break off from everyday plastic bottles.
Engineered and Weathered Polyethylene Terephthalate ( PET ) Microplastics and Nanoplastics Induce Form and Size‐Dependent Oxidative Stress, Oxidative DNA Damage, and Cytotoxicity in MCF ‐7 Cells
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Researchers tested how PET microplastics and nanoplastics, both pristine and environmentally weathered, affect human breast cancer cells in the lab. They found that all particle types caused dose-dependent cell damage, increased oxidative stress, and DNA damage, with weathered particles showing distinct toxicity patterns compared to pristine ones. The study suggests that the size, shape, and environmental aging of plastic particles all influence their potential to harm cells, and that weathered microplastics found in the real environment deserve more research attention.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.