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Those with allergic asthma face double trouble during flu season, UT Southwestern findings suggest
Date:5/28/2010

ergic stimulus, however, they are significantly impaired in their ability to produce such antiviral proteins.

When investigators exposed the dendritic cells from the study participants with allergic asthma to influenza, they found that the cells were unable to produce interferon, an immune system protein that plays a key role in fighting off repeated infections of the same virus. Interferon is what makes a person feel run down and tired when fighting viral infections.

The researchers speculate that the immune-suppressing effect of the allergic stimulation of dendritic cells might be related to the high levels of a molecule called IgE normally found in people with allergic asthma. Among the subjects participating in this study, elevated IgE levels were associated with impaired capacity of dendritic cells to produce interferon when exposed to flu.

Dr. Gill said these findings suggest that when the cold/flu and allergy seasons collide, the immune response in individuals with allergic asthma may worsen their disease.

"These findings imply that allergic triggers associated with exposure to indoor allergens like pet dander and dust mites can potentially render cells deficient in responding to a virus," Dr. Gill said. "It may although this remains to be proven also explain why asthmatics who are sensitive to indoor allergens often experience asthma exacerbations when they acquire respiratory viral infections."

The findings from this study prompted an upcoming mechanistic study of dendritic cells as part of the Inner City Asthma Consortium (ICAC), which receives funding through the National Institute of Allergy and Infectious Diseases. The dendritic cell component of the ICAC study will investigate whether a treatment to lower IgE in allergic asthma patients will improve dendritic cells' response to allergens and respiratory viruses. UT Southwestern is among 10 institutions involved in the ICAC, which is administered by the U
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Contact: Kristen Holland Shear
kristen.hollandshear@utsouthwestern.edu
214-648-3404
UT Southwestern Medical Center
Source:Eurekalert  

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Those with allergic asthma face double trouble during flu season, UT Southwestern findings suggest
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