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Immunotherapy reduces allergic patients' sensitivity to peanuts
Date:1/10/2013

Of all foods, peanuts are the most frequent cause of life-threatening and fatal allergic reactions. New research at National Jewish Health provides additional support for a strategy to reduce the severity of reactions to peanut repeatedly consuming small amounts of the very food that causes those reactions in the first place, a practice called immunotherapy.

The new research, published in the January 2013 issue of The Journal of Allergy & Clinical Immunology, shows that 70 percent of peanut-allergic patients who consumed daily doses of peanut protein in liquid drops could safely consume 10 times as much peanut protein as they had before the therapy. One patient's serious reaction, however, highlighted the care that must be taken to keep patients safe.

"Immunotherapy continues to show promise for treating food allergies," said lead author David Fleischer, MD, associate professor of pediatrics at National Jewish Health. "But it is not yet ready for widespread use; there is a fine line between safely desensitizing patients and causing serious allergic reactions. We are still working to discover where that line is and how to select patients who would most likely benefit."

Immunotherapy, in the form of allergy shots, has been used for more than a century to reduce patients' allergic reactions, mostly to pollen. Patients are injected with gradually increasing amounts of protein until they reach a "maintenance level," which they continue for two to five years. The current trial delivers immunotherapy through drops containing peanut protein placed under the tongue.

Somehow this small, but repeated exposure changes the way that the immune system 'sees' the proteinfrom mistakenly considering it a dangerous invader to accurately recognizing it as a harmless piece of the environment. Scientists do not understand exactly how this occurs. In recent years, there has been renewed interest in understanding and exploring new methods of immunotherapy for
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Contact: William Allstetter
allstetterw@njhealth.org
303-398-1002
National Jewish Health
Source:Eurekalert

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