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Scientists find how bacteria in cows' milk may cause Crohn's disease
Date:12/10/2007

Crohns is a condition that affects one in 800 people in the UK and causes chronic intestinal inflammation, leading to pain, bleeding and diarrhoea.

The team found that a bacterium called Mycobacterium paratuberculosis releases a molecule that prevents a type of white blood cell from killing E.coli bacteria found in the body. E.coli is known to be present within Crohns disease tissue in increased numbers.

It is thought that the Mycobacteria make their way into the bodys system via cows milk and other dairy products. In cattle it can cause an illness called Johne's disease - a wasting, diarrhoeal condition. Until now, however, it has been unclear how this bacterium could trigger intestinal inflammation in humans.

Professor Jon Rhodes, from the Universitys School of Clinical Sciences, explains: Mycobacterium paratuberculosis has been found within Crohns disease tissue but there has been much controversy concerning its role in the disease. We have now shown that these Mycobacteria release a complex molecule containing a sugar, called mannose. This molecule prevents a type of white blood cells, called macrophages, from killing internalised E.Coli.

Scientists have previously shown that people with Crohns disease have increased numbers of a sticky type of E.coli and weakened ability to fight off intestinal bacteria. The suppressive effect of the Mycobacterial molecule on this type of white blood cell suggests it is a likely mechanism for weakening the bodys defence against the bacteria.

Professor Rhodes added: "We also found that this bacterium is a likely trigger for a circulating antibody protein (ASCA) that is found in about two thirds of patients with Crohn's disease, suggesting that these people may have been infected by the Mycobacterium."

The team is beginning clinical trials to assess whether an antibiotic combination can be used to target the bacteria contained in white blood cells as a possible tr
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Contact: Samantha Martin
samantha.martin@liv.ac.uk
01-517-942-248
University of Liverpool
Source:Eurekalert

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