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The early cost of HIV
Date:8/29/2014

testinal barrier impermeable to pathogens. As a result, the normally cohesive barrier was breaking down.

Digging deeper, the researchers found the inflammatory response through IL-1β production was initiated in Paneth cells, which are known to protect the intestinal stem cells to replenish the epithelial lining. This is the first report of Paneth cell sensing of SIV infection and IL-1β production that links to gut epithelial damage during early viral invasion. In turn, the epithelial breakdown underscores that there's more to the immune response than immune cells.

"The epithelium is more than a physical barrier," said first author Lauren Hirao. "It's providing support to immune cells in their defense against viruses and bacteria."

The researchers found that addition of a specific probiotic strain, Lactobacillus plantarum, to the gut reversed the damage by rapidly reducing IL-1β, resolving inflammation, and accelerating repair within hours. The study points to interesting possibilities of harnessing synergistic host-microbe interactions to intervene early viral spread and gut inflammation and to mitigate intestinal complications associated with HIV infection.

"Understanding the players in the immune response will be important to develop new therapies," said Hirao. "Seeing how these events play out can help us find the most opportune moments to intervene."


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Contact: Carole Gan
carole.gan@ucdmc.ucdavis.edu
916-734-9047
University of California - Davis Health System
Source:Eurekalert

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