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Interferon might help asthma patients breathe easier, UT Southwestern study suggests
Date:7/13/2010

DALLAS July 15, 2010 An immune-system protein already used to treat diseases like multiple sclerosis, hepatitis C and a variety of cancers might also aid asthma patients, UT Southwestern Medical Center researchers have found.

The investigators determined that the protein interferon blocks the development of a population of immune cells known to cause asthma. These cells are members of a class of T lymphocytes, called T helper 2 cells, or Th2 cells. Under normal circumstances, Th2 cells help protect against infections by secreting chemicals that induce inflammation; however, in some individuals, these Th2 cells can also promote allergic responses to normally harmless substances, including animal dander, pollens and pollutants. Once Th2 cells become reactive to these substances, they promote all of the inflammatory processes common to allergic diseases like asthma and atopic dermatitis.

The findings, available online and in the July 15 issue of the Journal of Immunology, suggest that interferon might be a valuable and readily available therapy for individuals with asthma.

"This finding is incredibly important, because humans are being treated with interferon for a variety of diseases, yet no one has tried treating asthma patients with interferon," said Dr. J. David Farrar, assistant professor of immunology and molecular biology at UT Southwestern and senior author of the study. "The current therapies for asthma are inhalers and steroids, both of which offer only temporary relief."

Asthma results in approximately 200,000 pediatric hospitalizations each year, more than for any other childhood disease. About 20 million people have been diagnosed with asthma in the U.S.

In the current study, the researchers showed in isolated human cells that interferon blocks the development of nascent Th2 cells and inhibits cells that already have become Th2 cells by interfering with a regulatory protein called GATA3, a trans
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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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