Abstract
Lymphocytes from the synovial fluid of eight out of eight rheumatoid arthritis (RA) patients had elevated very late activation antigen-1 (VLA-1) expression (10-36% positive cells), whereas peripheral blood lymphocytes (PBL) from RA patients and healthy controls had low VLA-1 expression (0-6% positive cells). During 1-2 wk of in vitro culture, VLA-1 increased on synovial fluid cells but remained low on PBL. In comparison, the interleukin 2 receptor (IL-2 R) was less prominent than VLA-1 on fresh synovial fluid cells, did not increase on cultured synovial fluid T cells, but did increase greatly on cultured PBL. The mitogen PHA reversed or prevented the appearance of VLA-1+, IL-2 R- synovial fluid cells during in vitro culture, thus giving IL-2 R+, VLA-1- cells. These results emphasize that VLA-1+ SF cells are different from resting cells or IL-2 R+ activated PBL T cells, and VLA-1 on synovial fluid T cells may be incompatible with mitogen stimulation. In addition, the VLA-2 heterodimer (165,000/130,000 relative molecular mass [Mr]) was regulated opposite to the VLA-1 heterodimer (130,000/210,000 Mr) on synovial lymphocytes, and thus the VLA-1/VLA-2 ratio is another indicator of the stage of T cell activation.
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Selected References
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