Authors: J. Niederlová 1; D. Kodetová 2; O. Kryštůfková 1; V. Vilím 1 Authors‘ workplace: Revmatologický ústav, Praha 1; Ústav patologie a molekulární medicíny UK 2. LF a FN Motol, Praha 2 Published in: Čes. Revmatol., 14, 2006, No. 2, p. 49-52. Category: Original Papers
3-nitrotyrosine (3NT) is regarded as some kind of a „footprint“ of NO generation. Immunohistochemical analysis was performed on 9 specimens of human synovium (3 rheumatoid arthritis, 4 osteoarthritis (OA), 1 juvenile idiopathic arthritis, and 1 inflamed Baker’s cyst derived from a joint of a patient with villonodular synovitis). Serial sections were stained with monoclonal antibody 60-E3 to 3NT, and with antibodies to CD31, CD68, and CD14 reacting to endothelial cells, macrophages and monocytes, respectively. The majority of specimens demonstrated a pattern of strong 3NT staining localized to endothelial cells accompanied by weak immunostaining of tissues closely surrounding the 3NT-positive endothelia (7 of the 9 specimens, including all of the specimens derived from osteoarthritic joints). We observed strong 3NT immunostaining of synovial stroma in only 2 specimens of inflamed synovia, those collected from the Baker’s cyst secondary to villonodular synovitis and a knee joint with rheumatoid arthritis. We conclude that in human synovial tissue, tyrosine is primarily nitrated in endothelial cells. 3NT-positive staining of endothelial cells in OA synovia suggests that activation of endothelial cells occurs even in apparently non-inflammatory OA synovial tissue.
Key words: nitric oxide, nitrotyrosine, synovium, osteoarthritis, immunohistochemistry
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