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Rush University Medical Center scientists home in on cause of osteoarthritis pain
Date:12/27/2012

(CHICAGO)--Researchers at Rush University Medical Center, in collaboration with researchers at Northwestern University, have identified a molecular mechanism central to the development of osteoarthritis (OA) pain, a finding that could have major implications for future treatment of this often-debilitating condition.

"Clinically, scientists have focused on trying to understand how cartilage and joints degenerate in osteoarthritis. But no one knows why it hurts," said Dr. Anne-Marie Malfait, associate professor of biochemistry and of internal medicine at Rush, who led the study. An article describing the research was published in the December 11 print version of the Proceedings of the National Academy of Sciences.

Joint pain associated with OA has unique clinical features that provide insight into the mechanisms that cause it. First, joint pain has a strong mechanical component: It is typically triggered by specific activities (for example, climbing stairs elicits knee pain) and is relieved by rest. As structural joint disease advances, pain may also occur in rest. Heightened sensitivity to pain, including mechanical allodynia (pain caused by a stimulus that does not normally evoke pain, such as lightly brushing the skin with a cotton swab), and reduced pain-pressure thresholds are features of OA.

Malfait and her colleagues took a novel approach to unraveling molecular pathways of OA pain in a surgical mouse model exhibiting the slow, chronically progressive development of the disease. The study was conducted longitudinally, that is, the researchers were able to monitor development of both pain behaviors and molecular events in the sensory neurons of the knee and correlate the data from repeated observations over an extended period.

"This method essentially provides us with a longitudinal 'read-out' of the development of OA pain and pain-related behaviors, in a mouse model" Malfait said.

The researchers as
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Contact: Nancy DiFiore
nancy_difiore@rush.edu
312-942-5159
Rush University Medical Center
Source:Eurekalert

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