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Scientists identify new target to battle rheumatoid arthritis
Date:5/20/2012

A new study led by researchers at Hospital for Special Surgery identifies the mechanism by which a cell signaling pathway contributes to the development of rheumatoid arthritis (RA). In addition, the study provides evidence that drugs under development for diseases such as cancer could potentially be used to treat RA. Rheumatoid arthritis, a systemic inflammatory autoimmune disease that can be crippling, impacts over a million adults in the United States.

"We uncovered a novel mechanism by which the Notch pathway could contribute to RA, said Xiaoyu Hu, M.D., Ph.D., a research scientist at Hospital for Special Surgery in New York City and principal investigator of the study. The study appears online in advance of print in Nature Immunology.

Prior to this study, researchers knew that an intracellular molecular pathway called Notch is involved in diseases such as cancer. In the last year, other scientists conducted a genome wide association study to identify genes that were linked to the development of rheumatoid arthritis. They discovered that a certain mutation in a gene involved in the Notch pathway puts patients at risk for RA, but nobody knew just how it was involved.

"We were intrigued. Nothing has been known about how the Notch pathway is important to RA," said Dr. Hu. Working with researchers at other institutions in the United States and abroad, HSS investigators started putting two and two together and noted that Notch might be involved in a misfiring of the immune system that is commonly seen in RA.

The researchers designed experiments to test whether the Notch pathway had an influence on macrophages, a type of white blood cell that is most commonly known for gobbling up pathogens but which can also cause inflammation. Macrophages that have gone awry possess widespread pro-inflammatory and destructive capabilities that can critically contribute to acute and chronic rheumatoid arthritis. "In the case of RA,
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Contact: Phyllis Fisher
fisherp@hss.edu
212-606-1724
Hospital for Special Surgery
Source:Eurekalert  

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