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Date:8/23/2012

When you are hit with the flu, you know it immediately -- fever, chills, sore throat, aching muscles, fatigue. This is your body mounting an immune response to the invading virus. But less is known about what is happening on the molecular level.

Now Northwestern University scientists have discovered one of the ways the influenza virus disarms our natural defense system. The virus decreases the production of key immune system-regulating proteins in human cells that help fight the invader. The virus does this by turning on the microRNAs -- little snippets of RNA -- that regulate these proteins.

The researchers, led by molecular biologist Curt M. Horvath, are among the first to show the influenza virus can change the expression of microRNA to control immune responses in human lung cells.

The findings reveal a new aspect of the interaction between the influenza virus and its host. Knowing how viruses disable the immune system to wreak havoc in the body will help researchers design therapeutics to preserve the immune response and keep people healthy. The knowledge also may be valuable for future diagnostics.

The study is published by the Journal of Biological Chemistry. The paper will appear in its final form in September.

"It's a battle of supremacy between virus and host," said Horvath, the senior author of the paper. "Our goal is to understand how the flu replicates in the host. Now we've discovered a new pathway in which the flu controls the immune response, by shutting down vital protein production. With better understanding of this mechanism, one day we may be able to customize therapeutics to target individual flu strains."

Horvath is the Soretta and Henry Shapiro Research Professor in Molecular Biology and professor of molecular biosciences in the Weinberg College of Arts and Sciences. He also is professor of microbiology-immunology and medicine at the Feinberg School of Medicine.

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Contact: Megan Fellman
fellman@northwestern.edu
847-491-3115
Northwestern University
Source:Eurekalert

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