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Journal Article
Research Support, Non-U.S. Gov't
Review
Is there a pathogenic link between gamma heavy chain disease and chronic arthritis?
Current Opinion in Rheumatology 2000 January
In 1991, gamma heavy chain disease was diagnosed in a 43-year-old female, who 3 years earlier had contracted an erosive seronegative chronic arthropathy. In 1996, her lymphoproliferative disorder required treatment with melphalan and prednisolone. Laboratory studies revealed a gamma3 heavy chain monoclonal component in serum and urine. Massive localization of plasma cells and blasts with cytoplasmic or cell membrane staining for gamma3 chains, but no staining for light chains, was observed by immunohistochemical studies of bone marrow as well as affected synovial tissue. Large amounts of extracellular gamma3-chains were also deposited in the synovial membrane. This is the first documentation of gamma heavy chain deposition disease directly affecting articular structures. Whether it represents the primary pathogenic event followed by reactive inflammatory changes in the joints, or another example of gamma heavy chain disease preceded by chronic arthritis, remains elusive. Regardless, several common cellular and molecular mechanisms discussed here suggest a pathogenic link between the two disease processes.
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