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Study points to essential role of IL-22 in lung repair after the flu
Date:3/10/2013

Philadelphia, PA, March 11, 2013 Once the initial episode of influenza has passed, the chronic effects tend to be overlooked. The results of a new study indicate that the cytokine interleukin-22 (IL-22) plays a critical role in normal lung repair following influenza infection. This study is published in the April 2013 issue of the American Journal of Pathology.

"With the increasing prevalence of more infective and/or virulent strains of influenza, understanding the impact of virus on the host epithelium and the processes involved in lung repair are of great importance," says John F. Alcorn, PhD, an immunologist affiliated with the department of pediatrics at the Children's Hospital of Pittsburgh of UPMC. He notes that the findings open up new possibilities for developing therapeutic agents that promote recovery of normal lung function and architecture after influenza infection and lessen the likelihood of secondary infections. "A key finding is that even after the resolution of infection, influenza results in lung parenchymal remodeling that may be critical to susceptibility to further injury," says Dr. Alcorn.

This series of experiments used 6- to 8-week-old wild-type (WT) mice (C57BL/6 strain) as well as IL-22deficient mice, infected with influenza A PR/8/34 H1N1 or control vehicle. To determine the distribution of IL-22 in the lung, they used immunohistochemistry for the high affinity IL-22Ra1 receptor. Investigators found that in WT mice not inflected with influenza, IL-22 receptors were distributed on epithelial cells of the large and small airways, but not within the parenchyma. They noted that this receptor distribution suggests that in the absence of lung injury, IL-22 interacts mainly with the bronchial epithelial cells.

By 21 days post influenza infection, IL-22 receptors were observed in parenchymal tissue in injured areas, such as alveoli under repair. Researchers suggest that the IL-22 receptor can be upregulated
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Contact: David Sampson
ajpmedia@elsevier.com
215-239-3171
Elsevier Health Sciences
Source:Eurekalert

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