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Brushing teeth well can reduce colorectal cancer risk

ANI  |  Washington 

Two new studies have revealed that gut microbes known as fusobacteria, which are found in the mouth, stimulate bad immune responses and turn on growth genes to generate colorectal tumors.

The findings could lead to more effective strategies for the early diagnosis, prevention, and treatment of colorectal

"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," senior study author Wendy Garrett of the Harvard School of Public and the Dana-Farber Institute, said.

Colorectal 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 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 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

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 cells.

FadA then turns on 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 compared with healthy individuals.

Moreover, they identified a compound that can prevent FadA's effects on cells.

The study is published in the journal Cell Host and Microbe.

First Published: Thu, August 15 2013. 11:21 IST