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Dr. Lamm's weekly review of relevant articles and research

There is an increasing amount of information available about the gut.  Here are a few informative articles you may find valuable.

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How bacteria found in mouth may cause colorectal cancer

How bacteria found in mouth may cause colorectal cancer
Contact: Mary Beth O'Leary, This email address is being protected from spambots. You need JavaScript enabled to view it.
Embargoed for release: 14-Aug-2013

Gut microbes have recently been linked to colorectal cancer, but it has not been clear whether and how they might cause tumors to form in the first place. Two studies published by Cell Press on August 14th in the journal Cell Host & Microbe reveal how gut microbes known as fusobacteria, which are found in the mouth, stimulate bad immune responses and turn on cancer growth genes to generate colorectal tumors. The findings could lead to more effective strategies for the early diagnosis, prevention, and treatment of colorectal cancer.

"Fusobacteria may provide not only a new way to group or describe colon cancers but also, more importantly, a new perspective on how to target pathways to halt tumor growth and spread," says senior study author Wendy Garrett of the Harvard School of Public Health and the Dana-Farber Cancer Institute.

Colorectal cancer is the second leading cause of cancer-related death in the United States. Recent studies have shown that fusobacteria from the mouth are also abundant in tissues from colorectal cancer patients. But until now, it was not known whether these microbes directly contribute to the formation of tumors.

In one of the new studies, Garrett, Matthew Meyerson of the Dana-Farber Cancer Institute, and their collaborators found that fusobacteria are prevalent in human adenomas -- benign tumors that can become malignant over time -- suggesting that these microbes contribute to early stages of tumor formation. In a mouse model of colorectal cancer, these bacteria accelerated the formation of tumors by attracting immune cells called myeloid cells, which invade tumors and stimulate inflammatory responses that can cause cancer.

In the second study, Yiping Han of Case Western Reserve University School of Dental Medicine and her collaborators discovered that fusobacteria rely on a molecule called Fusobacterium adhesin A (FadA), which is found on the surface of these bacterial cells, to attach to and invade human colorectal cancer cells. FadA then turns on cancer growth genes and stimulates inflammatory responses in these cells and promotes tumor formation.

Han and her team also found that FadA levels were much higher in tissues from patients with adenomas and colorectal cancer compared with healthy individuals. Moreover, they identified a compound that can prevent FadA's effects on cancer cells. "We showed that FadA is a marker that can be used for the early diagnosis of colorectal cancer and identified potential therapeutic targets to treat or prevent this common and debilitating disease," Han says.

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