General
publicado em 15/08/2013 às 17h30:00
   Dê o seu voto:

Common bacteria found in the mouth triggers colorectal cancer

Team create peptide that prevents the action of micro-organism that accelerates accumulation of cancer cells in the colon

 
font size
A-
A+

Researchers from Case Western Reserve University School of Dental Medicine have discovered how a common oral bacterium can contribute to colorectal cancer, a finding that opens promising new research avenues for the development of approaches to prevent and treat the disease.

"We found this cancer is linked to an infection from [the bacterium]," said Yiping Han, professor of periodontics at the dental school and the study's lead investigator. "This discovery creates the potential for new diagnostic tools and therapies to treat and prevent the cancer."

The results of the research appear in the current issue of Cell Host & Microbe, in conjunction with a second study from a different research group that highlights how the bacteria can speed the accumulation of cancerous cells.

The researchers also learned how to prevent the microorganism, called Fusobacterium nucleatum (Fn), from attaching to colon cells and potentially triggering a cascade of changes that can lead to cancer.

The latest findings advance research from 2011, in which Han and her team identified an adhesive molecule on Fn's surface, called FadA, which can attach to VE-cadherin, a cell receptor from the cadherin group on blood vessels.

As Han completed the work on FadA and VE-cadherin, researchers from Harvard University and the University of British Columbia discovered the presence of Fn was higher in malignant tumors compared to the surrounding tissue.

Han said she immediately suspected Fn interacted with cells in the colon similarly to those in blood vessels and shifted her lab's work to focus on colorectal cancer.

"This was one of those serendipitous scientific moments in making this discovery," Han said.

Because her lab was able to track Fn's ability to attach to the VE-cadherin receptor on blood vessels, Han said it didn't take long before her team found how FadA attached to the E-cadherin receptor on cells in the colon.

Subsequently, FadA's attachment to E-cadherin set in motion a protein called ß-catenin, which, among its many functions, produces two important actions in the cancer process: an inflammatory response that alters the immune system, and another that spurs cancer cell growth.

Han's lab designed a novel synthetic peptide that prevents FadA from attaching to E-cadherin and inciting actions that lead to cancer development.

They also found that the FadA gene levels are 10 to 100 times higher than normal in precancerous and malignant colon polyps.

Thus, Han said, "FadA can be used as a diagnostic marker for early detection of colon cancer. It can also be used to determine if treatment works effectively at reducing Fn load in the colon and the mouth."

A patent application has been filed on work associated with this research.

At the same time, Han emphasized that the results highlight the importance of oral health. Fn is an opportunistic bacterium that increases dramatically in gum disease.

Source: CASE WESTERN RESERVE UNIV
   Palavras-chave:   Oral bacteria    Colorectal cancer    Oral health    Case Western Reserve University    Yiping Han   
  • Share this pageShare this page
  • Share this pageCorrect
  • ShareShare
  • AlertAlert
Reduced link: 
  • You are recommending this story: Common bacteria found in the mouth triggers colorectal cancer
  • Fill in the following form to send your recommendation to your friend:

  • You are suggesting a correction for this story: Common bacteria found in the mouth triggers colorectal cancer


Receba notícias do iSaúde no seu e-mail de acordo com os assuntos de seu interesse.
Seu nome:
Seu email:
Desejo receber um alerta com estes assuntos:
Oral bacteria    colorectal cancer    oral health    Case Western Reserve University    Yiping Han   
Comments:
Comment
Leave your comment
Close
(Required fields are marked with an *)

(Your email address will never be published or shared.)

Enter the letters and numbers below and click in the button "send"

  • Twitter iSaúde
advertising
Informe Saúde printed version

Recommend the portal
Close [X]
  • You are recommending this story: http://www.isaude.net
  • Fill in the following form to send your recommendation to your friend:

RSS news from the portal  iSaúde.net
Get the newsletter of the portal  iSaúde.net
Recommend the portal iSaúde.net
News from  iSaúde.net in your blog or website.
Get news on the subject of your interest.
© 2000-2011 www.isaude.net Todos os direitos reservados.