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Polyvinyl chloride promotes radioresistance in hepatocellular carcinoma by inhibiting radiotherapy-induced CD8⁺ T cell differentiation
Original title: Polyvinyl chloride promotes radioresistance in hepatocellular carcinoma by inhibiting radiotherapy-induced CD8⁺ T cell differentiation
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Scientists found microplastics in most liver cancer samples they tested, and one common type—polyvinyl chloride (PVC), found in pipes, packaging, and other everyday products—appears to make radiation therapy less effective by weakening the immune system's cancer-fighting cells. The good news: in lab studies, boosting cholesterol helped restore those immune cells and improved how well radiation worked, suggesting doctors might one day counteract this effect. This research adds to growing evidence that the tiny plastic particles we're constantly exposed to could be quietly undermining cancer treatments, making plastic pollution a health issue
Radiotherapy is standard-of-care treatment for intermediate and advanced hepatocellular carcinoma (HCC); however, resistance remains widespread. Microplastics are detectable in various tumors and may disrupt immune responses, but evidence regarding the role of microplastics in radiotherapy is scarce. Here we show that various types of microplastics are detectable in 52 of the 72 HCC samples we examine, but only polyvinyl chloride (PVC) impairs radiotherapy efficacy. Mechanistically, irradiation enhances histone lactylation, which promotes transcription of HMG-CoA reductase in HCC cells, thereby facilitating cholesterol synthesis and reinforcing CD8+ T cell stemness. PVC alters cholesterol localization and affects CD8⁺ T cell differentiation, which results in the maintenance of an immunologically cold tumor immune microenvironment. A high-cholesterol diet restores CD8+ T-cell stemness and improves therapeutic response to radiotherapy in PVC-infiltrated HCC. Targeting cholesterol metabolism may represent a potential combinatorial strategy to enhance the efficacy of radiotherapy in PVC-infiltrated HCC. Microplastics have become a common pollutant in modern life, and their influence on disease and therapy outcomes is a pressing public health issue. Here, the authors show that several types of microplastics are detectable in most samples from human hepatocellular cancers, and of these, polyvinyl chloride interferes with radiotherapy via changing the anti-tumor CD8 + T cell response and the tumor microenvironment.
More Papers Like This
Polyvinyl Chloride Promotes Radioresistance in Hepatocellular Carcinoma by Inhibiting Radiotherapy-Induced CD8⁺ T Cell Differentiation
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Researchers found microplastics in 72% of human liver cancer (HCC) tumor samples, and specifically identified polyvinyl chloride (PVC) as an immune disruptor that blunts the cancer-killing immune response triggered by radiotherapy. PVC altered cholesterol distribution in immune cells, preventing anti-tumor CD8+ T cells from maturing properly — and a high-cholesterol diet reversed this effect, suggesting that microplastic exposure inside tumors may be actively undermining standard cancer treatments.
Polyvinyl Chloride Promotes Radioresistance in Hepatocellular Carcinoma by Inhibiting Radiotherapy-Induced CD8⁺ T Cell Differentiation
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This is a duplicate entry of the same study (also listed as ID 2583) finding that polyvinyl chloride microplastics were present in 72% of human liver cancer tumors and that PVC inhibits the immune response to radiotherapy by disrupting cholesterol metabolism in CD8+ T cells, potentially undermining cancer treatment outcomes.
Polyvinyl Chloride Promotes Radioresistance in Hepatocellular Carcinoma by Inhibiting Radiotherapy-Induced CD8⁺ T Cell Differentiation
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Researchers found that PVC microplastics, detected in 72% of 72 hepatocellular carcinoma tumor samples, promoted resistance to radiotherapy by inhibiting CD8+ T cell differentiation, with mechanistic analysis revealing that radiotherapy-enhanced histone lactylation upregulated HMG-CoA reductase in cancer cells to facilitate cholesterol accumulation and impair immune-mediated tumor killing.
Effects of microplastics on the colorectal tumor immune microenvironment and immunotherapy resistance via JAK–STAT–microbiota perturbation.
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Scientists found that microplastics—tiny plastic particles now common in our environment—can build up in colorectal (colon) tumors and make cancer immunotherapy less effective, based on studies in mice. The plastics seem to weaken the immune system's ability to find and attack cancer cells, partly by disrupting gut bacteria and blocking key immune signals. While this research was done in animals rather than people, it raises concerning questions about whether everyday plastic exposure could affect cancer treatment outcomes in humans.
Worker studies suggest unique liver carcinogenicity potential of polyvinyl chloride microplastics
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This study reviews evidence from workers in polyvinyl chloride (PVC) manufacturing plants and finds that PVC microplastic exposure is uniquely linked to liver cancer risk. The evidence of liver damage from occupational exposure to other types of microplastics is limited, suggesting PVC may be especially harmful. These worker studies provide important real-world data on how chronic microplastic exposure at high levels could affect human liver health.
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