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Effects of microplastics on chemo-resistance and tumorigenesis of colorectal cancer
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For the first time, researchers confirmed the presence of microplastics in human colorectal cancer tissue and showed in animal models that microplastics increased cancer rates and made tumors more resistant to chemotherapy drugs. The study found that microplastics trigger a cell survival mechanism called autophagy that helps cancer cells resist treatment, suggesting plastic pollution could complicate cancer outcomes.
Microplastics (MPs) are widely distributed environmental pollutants around the world. Although studies have demonstrated that MPs have adverse effects on human health, the relationship between MPs and tumors remains unclear. The gut is the main site of microplastics absorption, and the function of MPs in the chemoresistance and progression of colorectal cancer (CRC) needs more investigation. Here, we show that MPs exist in human CRC tissues for the first time by using a laser direct infrared chemical imaging system. MPs can cause an increase in CRC incidence in animal models and promote resistance to oxaliplatin. It is illustrated that the uptake of MPs enhances levels of autophagy by activating the mTOR pathway. MPs can also promote the disorder of intestinal flora and intestinal inflammation, serving as an essential component in the onset and advancement of CRC. These results indicated that microplastic pollutants in colorectal cancer could mediate protective autophagy through the mTOR/ULK1 axis, which is one of the new reasons for chemo-resistance in CRC under the background of increasingly serious microplastics pollution. This study identified the adverse effects of MPs on colorectal cancer progression and chemotherapy prognosis, and attempted to block the intake of MPs to propose a novel approach for clinical precision treatment.
More Papers Like This
Microplastics promote chemoresistance by mediating lipid metabolism and suppressing pyroptosis in colorectal cancer
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This study found that microplastics can make colorectal cancer cells more resistant to chemotherapy drugs. Cancer cells absorb microplastics through a protein called clathrin, which triggers increased fat absorption and suppresses a cell death pathway that drugs normally rely on. These findings suggest that microplastic accumulation in the gut could potentially interfere with cancer treatment effectiveness.
Microplastics and colorectal cancer: presence in human colorectal tissues and associations with tumor biology
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This review of 13 studies found that microplastics, tiny plastic particles from everyday sources like packaging and synthetic fabrics, show up in higher amounts in colorectal cancer tumors than in surrounding healthy tissue. Higher microplastic levels were linked to more aggressive tumors, more inflammation, and disrupted gut barrier function, suggesting these particles may help create conditions that favor cancer growth. While this doesn't prove microplastics cause colorectal cancer, it's a strong signal that reducing plastic exposure could matter for gut health, and larger studies are needed to confirm the connection.
A multi-omics signature of microplastic exposure and its clinical, metabolic, and microbial correlates in colorectal cancer
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Scientists found tiny plastic particles (from common plastics like PVC and polyethylene) built up more in colon tumors and the tissue around them than in blood samples from cancer patients. These plastic particles were linked to changes in blood chemistry and gut bacteria, suggesting microplastics might interact with the body's metabolism in ways connected to colorectal cancer. This is early evidence, not proof of cause and effect, but it highlights why reducing plastic exposure and further research into this link matter for gut health.
Microplastics and Colorectal Cancer: Presence in Human Colorectal Tissues and Associations with Tumor Biology- A Systematic Review
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This review of 13 studies found that tiny plastic particles called microplastics are present in human colon tissues, with higher amounts found in cancerous tumors compared to healthy tissue. The research suggests these plastic particles may contribute to colon cancer development by causing inflammation and creating conditions that help tumors grow. While more research is needed to prove a direct cause-and-effect relationship, this highlights growing concerns about how plastic pollution in our environment and food supply might affect human health.
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.
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