To investigate the histopathological arthropathy in severe combined immunodeficient (SCID) mice given intraarticular injection of toxic shock syndrome toxin-1 (TSST-1) stimulated T cells from patients with rheumatoid arthritis (RA).
Unstimulated or TSST-1 stimulated T cell blasts (TB-TSST) of synovial fluid mononuclear cells from patients with RA (RASFMC) were intraarticularly injected into the knee joint of SCID mice. Four weeks later, the knee joints were histopathologically examined and the numbers of fibroblasts in the synovial tissues were compared with those of controls. Total RNA of the SCID mouse knee joints was isolated and Southern analysis for human T cell receptor (TCR) V beta 2 and human tumor necrosis factor-alpha (TNF-alpha) was carried out.
Hyperplasia and increased numbers of the fibroblasts as well as neovascularization of the synovial tissues were observed in the SCID mouse knee joint tissues injected with TB-TSST of RASFMC compared with those injected with unstimulated T cells from RASFMC or with TB-TSST from peripheral blood of healthy controls. Messenger RNA for human TCR V beta 2 and TNF-alpha were detected in the SCID mouse knee joint tissues injected with TB-TSST from RASFMC.
Superantigen TSST-1 stimulated T cells from RASFMC have the ability to induce chronic arthropathy with fibroblast proliferation and neovascularization in the SCID mouse.