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A single protein regulates 2 immune pathways
Date:4/29/2010

HOUSTON (April 29, 2010) Unchecked, the natural or innate immune system can run out of control like a stuck accelerator on a car. Eventually, it will kill the host it is supposed to protect.

Much scientific attention is directed at understanding how this innate immune system is turned on, but little to how it is cooled down or regulated. That is important because the innate immune system is associated with inflammation. In turn, unchecked inflammation is associated with cancer, heart disease, autoimmune diseases and other chronic ailments.

A team of researchers led by Baylor College of Medicine has identified a protein called NLRC5, a member of the NOD-like protein family, that is involved in inhibition of protein complexes key to critical pathways of innate immunity called NF-κB and type I interferon signaling. A report on their work appears in the current issue of the journal Cell.

"Understanding the molecular mechanisms that hold innate immunity in check could provide clues to better treatments for cancer and autoimmune diseases associated with inflammation," said Dr. Rong-Fu Wang, professor in the Center for Cell and Gene Therapy, the department of pathology and immunology at BCM and a senior author of the report.

Think of the innate immune system as a rushing cascade, blocked in places by chunks of rock or landscape and forced through natural cavities in a particular direction. Protein complexes such as the protein IKK complex in NF-κB pathway, and RIG-I and MDA5 as pathogen sensors in type I interferon pathways, act like these natural forces to control and direct the cascade of events that result in innate immunity.

NLRC5 interacts with two subunits of IKK to prevent their activation through blocking addition of a phosphate molecule (phosphorylation). This in turn, inhibits NF-κB activation and innate immune responses. NLCRC5 also interacts with innate immune receptors RIG-I and MDA5
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Contact: Graciela Gutierrez
ggutierr@bcm.edu
713-798-4710
Baylor College of Medicine
Source:Eurekalert

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