A vital molecule for resistance to food allergy has been identified and offers a potential target for therapy.There is currently no way to treat food allergy and the only way for sufferers to manage the problem is to avoid certain foods and make sure they have injectable adrenaline at hand.

Scientists led by Dr Claudio Nicoletti at the Institute of Food Research in Norwich have found that a molecule called Interleukin-12 (IL-12) is absent during allergic responses. Dr Nicoletti suggests that by delivering an allergen in the presence of IL-12, allergic reactions could be brought back under control.

A food protein can be perfectly harmless to one person and lethal to another, said Dr Nicoletti. We have identified the missing molecule that normally keeps immune responses under control and appropriate.

Having a food allergy means that the immune system responds to a food protein as if it was harmful. The immune system produces immunoglobulin E (IgE) antibodies, which normally help the body fight parasites. In the most severe cases individuals can suffer life-threatening reactions, including anaphylactic shock.

In previous research, Dr Nicoletti found that special types of white blood cells called dendritic cells are important in helping the immune system decide on how to respond to foreign molecules. In the latest research, Dr Nicoletti compared the activity of dendritic cells in the gut and in the spleen of allergic and allergy resistant mice. He found that in the gut of susceptible mice, dendritic cells have stopped producing IL-12.

We have identified a molecule that is very important for the regulation of immune response and for the first time clearly represents a potential target for the therapy of allergy. This is currently under investigation, said Dr Nicoletti.

David Reading, director of the Anaphylaxis Campaign, said: Food allergy can place an extremely heavy burden on the familie
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