COLUMBUS, Ohio -- Researchers have discovered a potential method to help treat inflammatory forms of arthritis by using an enzyme naturally produced by the human body.

Researchers found that the enzyme neutral endopeptidase (NEP) could reduce some of the effects of inflammatory arthritis, according to a study in a recent issue of the journal Inflammation.

“NEP holds promise as a unique therapeutic strategy for the treatment of inflammatory arthritis,” said Patrick Ward, professor of physiology at Ohio State University and co-author of the study.

NEP works to control the levels of certain peptides, such as bradykinin, that have been linked to joint inflammation found in arthritis patients.

Peptides, short chains of amino acids, can produce inflammatory-type reactions, such as pain and increased blood flow, associated with tissue break-down. In healthy individuals, NEP is one of the enzymes which controls the effects of such peptides, Ward said.

Ward and his colleagues tested synovial fluid from the joints of three patients with rheumatoid arthritis. The researchers then added NEP to the fluid and found that NEP decreased the negative effect of the inflammatory peptide bradykinin.

While NEP could potentially be used as a drug, its high cost and the difficulty of delivery to inflamed sites would limit its use. However, Ward said that gene therapy may be a more logical solution.

“If the body is unable to manufacture enough NEP to control the inflammatory effects of these peptides, it may be possible to stimulate synovial cells to make more of their own NEP,” Ward said. He and his colleagues suggest that gene therapy may be used to insert a gene that controls NEP production.

The extra levels of the enzyme could then degrade inflammation-causing peptides and decrease damage and/or pain in joints. This concept is consistent with the
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Contact: Patrick Ward
Ward.10@osu.edu
(614) 292-2175
Ohio State University
22-Apr-1998