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Innate immune system protein provides a new target in war against bacterial infections
Date:7/2/2012

Research led by St. Jude Children's Research Hospital scientists has identified a possible new approach to defeating bacterial infections by targeting an innate immune system component in a bid to invigorate the immune response.

In this study, researchers demonstrated that the primary function of one of the innate immune molecules is to suppress inflammation, which in turn dampens the immune response to infections and other threats. Investigators showed the protein works by inhibiting two pathways that control production of specialized molecules that fight infections. The findings appear in the current online edition of the scientific journal Nature.

"The beauty of this finding is that if we can generate monoclonal neutralizing antibodies against this protein, we can block bacterial infection. This discovery offers a completely new approach to fighting infections by targeting the host immune response rather than the bacterium," said Thirumala-Devi Kanneganti, Ph.D., an associate member of the St. Jude Department of Immunology, and the study's senior and corresponding author. Monoclonal antibodies are laboratory-produced versions of natural antibodies and are designed to detect specific proteins. Kanneganti laboratory is already working to develop a neutralizing antibody.

Despite the availability of antibiotics, bacterial infections continue to extract a heavy toll of suffering and death. A better understanding of how the immune system recognizes and responds to infectious agents would aid efforts to develop new, more effective treatments.

This study builds on earlier work from Kanneganti's laboratory and focuses on the NOD-like receptor protein 6 (NLRP6). NLRP6 belongs to a family of proteins that are part of the innate immune response that serves as the first line of defense. These proteins serve as sentinels working inside cells to recognize and response to infectious agents. Until now, however, nothing was known ab
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Contact: Summer Freeman
summer.freeman@stjude.org
901-595-3061
St. Jude Children's Research Hospital
Source:Eurekalert

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