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New therapeutic target identified for rheumatoid arthritis
Date:11/5/2008

Researchers at Hospital for Special Surgery have identified a potential new therapeutic target that could be used to treat inflammatory disorders, such as rheumatoid arthritis.

The study, published online ahead of print, will appear Nov. 15 in the journal Immunity. Specifically, the study reveals that two molecular pathways, the Notch and Toll-like receptor pathways, are linked and that manipulating a protein called RBP-J involved in both pathways, could serve as a treatment for rheumatoid arthritis.

"This is a basic science papers with translational and clinical implications, as it identifies a potential new therapeutic target in the treatment of inflammatory disorders," said Lionel Ivashkiv, M.D., director of Basic Research at Hospital for Special Surgery in New York City. He said that drugs, so-called gamma secretase inhibitors that hit this new target, are actually in trials for the treatment of another disease, leukemia.

Previous research has shown that activation of certain cell surface receptors called Toll-like receptors leads to the production of inflammatory proteins or cytokines. Researchers have also known that a protein called interferon gamma can increase inflammatory response, but they didn't know the exact mechanism.

To find out, they turned to microarray analysis, a method of surveying an entire genome to determine which genes are being expressed or which are responsible for a certain condition. Using this technology with human macrophages, white blood cells that are vital to the development of inflammatory response, they identified a subset of genes that were turned on by the activation of Toll-like receptors and inhibited by interferon gamma. This subset of genes included genes that are involved in the Notch signaling pathway. For some time, scientists have known that the Notch signaling pathway regulates cell differentiation, proliferation, survival and development.

"Before this study,
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Contact: Phyllis Fisher
fisherp@hss.edu
212-606-1197
Hospital for Special Surgery
Source:Eurekalert

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