Scientists Finally Solve How Common Gut Bacteria Triggers Colon Cancer
Summary
Scientists have discovered how a toxin made by a common gut bacterium called Bacteroides fragilis attaches to a protein on colon cells, causing damage that can lead to colorectal cancer. This breakthrough helps explain how some gut bacteria may directly contribute to the development of colon tumors and offers a new way to potentially block the toxin’s harmful effects.Key Facts
- Bacteroides fragilis is a common bacterium found in about 20% of healthy people’s guts.
- Only certain strains of this bacterium produce a toxin called BFT linked to colorectal cancer.
- The toxin binds to a protein on colon cells called claudin-4 to start damaging the gut lining.
- Damage from BFT triggers inflammation, which may lead to tumor growth in the colon.
- Researchers used a gene-editing method (CRISPR) to find claudin-4 as the toxin’s attachment point.
- Blocking claudin-4 prevented the toxin from harming colon cells in lab tests.
- Scientists created a molecular "decoy" that mimics claudin-4 to intercept the toxin and stop damage in animal studies.
- Maintaining a healthy diet and lifestyle can help support colon health and reduce cancer risk.
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