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Dietary Micro- and Nanoplastics and Gastrointestinal Carcinogenesis: Mechanistic Insights, Toxicological Evidence, and Critical Knowledge Gaps
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This review summarizes existing research on tiny plastic particles found in food and human tissue, including colorectal tumors. Lab and animal studies suggest these particles may cause cell damage, inflammation, and gut bacteria changes linked to cancer, but the review notes no proven cause-and-effect link in humans and calls for more research.
The widespread presence of micro- and nanoplastics (MNPs) in food, their increasing detection in human tissues, and growing evidence of dietary exposure have raised concerns regarding their potential impact on human health. Although the carcinogenic potential of MNPs has not yet been established in human populations, mechanistic studies have identified effects on biological pathways relevant to carcinogenesis. This review summarizes current knowledge on dietary and systemic exposure to MNPs and evaluates the strength and limitations of the evidence linking MNP exposure with gastrointestinal carcinogenesis, with particular emphasis on colorectal cancer (CRC). Recent studies have demonstrated the presence and accumulation of microplastics in human tissues, including colorectal tumor samples, indicating internal exposure but not establishing a causal relationship between MNP exposure and tumor development. Experimental studies indicate that MNPs may promote oxidative stress (OS), DNA damage, chronic inflammation, mitochondrial dysfunction, epigenetic alterations, and disruption of gut microbiota homeostasis, all of which are biological processes implicated in carcinogenesis. The biological effects of MNP appear to depend on their physicochemical characteristics, including particle size, polymer composition, surface properties, and associated chemical contaminants. The integration of exposure data with mechanistic evidence supports the biological plausibility of MNP-associated effects relevant to gastrointestinal carcinogenesis. However, much of the current evidence relies on in vitro and animal models using exposure conditions that may not fully reflect chronic, environmentally relevant human exposure. Crucially, major knowledge gaps remain, particularly regarding human epidemiological evidence, long-term exposure assessment, analytical limitations, and evidence for causality. Future research should focus on standardized analytical approaches, longitudinal studies, physiologically relevant exposure models, and an improved understanding of how specific MNP characteristics influence molecular pathways associated with carcinogenesis.
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Tiny plastic particles from our food and packaging are showing up in human stool and even colon tissue, and this review pulls together research suggesting they may disrupt gut bacteria, weaken the gut's protective lining, and trigger inflammation—effects that have been loosely linked to conditions like inflammatory bowel disease and colorectal cancer. It's important to note this is a summary of existing lab and early clinical studies, not new proof that plastics cause these diseases in people—scientists say we still need larger human studies to confirm the connection and figure out if cutting plastic exposure actually improves gut health.
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This systematic review examines the potential link between microplastics and nanoplastics and colorectal cancer. The research highlights how these tiny particles may contribute to cancer development through mechanisms like chronic inflammation and cellular damage in the gut. While more studies are needed, the findings raise important questions about the long-term consequences of ingesting plastic particles.
Impact of micro- and nanoplastics on gastrointestinal diseases: Recent advances
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This review summarizes how micro- and nanoplastics can harm the digestive system by causing oxidative stress, inflammation, cell death, and disruption of gut bacteria. These connected pathways can damage the intestinal lining and may contribute to conditions like inflammatory bowel disease and colorectal cancer. The findings highlight the importance of understanding how everyday plastic exposure through food and water could affect gut health over time.
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.
The link between microplastics and colorectal cancer
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This review of existing research found that tiny plastic particles (microplastics) show up in higher amounts in colorectal tumors and stool samples of cancer patients, and lab studies show these particles can trigger cell damage and inflammation linked to cancer growth. While scientists haven't proven microplastics directly cause colorectal cancer, the effect seems strongest when your gut's protective lining is already weakened, something that happens with smoking, heavy drinking, chronic stress, or digestive diseases like IBD, suggesting these groups may want to be extra mindful of plastic exposure.
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