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The problem with treating spondylarthritis with anti-TNF strategies

Any form of arthritis that affects one or more vertebral joints, spondylarthritis (SpA) represents a group of closely related disorders, including ankylosing spondylitis (AS), psoriatic arthritis (PsA), and arthritis associated with inflammatory bowel disease. Aside from chronic inflammation, these conditions are all characterized by ankylosis, stiffness and fusion of bone in the spine and peripheral joints, provoked by abnormal cartilage and bone formation. What triggers ankylosis remains unknown. Currently, inhibition of tumor necrosis factor (TNF) is the most effective strategy for controlling the painful symptoms of SpA and slowing vertebral joint destruction. But does anti-TNF therapy do anything to reduce the incidence or severity of ankylosis?

To answer this critical question, a quartet of researchers led by Dr. Frank P. Luyten, Division of Rheumatology, University Hospitals, Leuven, Belgium, tested the effectiveness of etanercept, an established TNF receptor, on animal models of arthritis. Their findings, highlighted in the February 2007 issue of Arthritis & Rheumatism (http://www.interscience.wiley.com/journal/arthritis), cast doubts on the feasibility of preventing joint and spine ankylosis with anti-TNF strategies while shedding light on the process of SpA.

A sample of male mice with spontaneous arthritis were caged together and observed from the age of 10 weeks. From week 12 to week 25, the mice were treated twice weekly with etanercept, in a strength comparable to standard dosage for human patients, or a placebo. Mice were also scored twice weekly for signs of arthritis, including cartilage formation, bone formation, and joint ankylosis. The mice were killed at age 25 weeks, autopsied, and analyzed, through cell population staining, for the presence of TNF.

In a complementary experiment, another sample of mice was induced with arthritis, using met
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Contact: Amy Molnar
amolnar@wiley.com
John Wiley & Sons, Inc.
30-Jan-2007


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