title: Expression of TLiSA1 on T cells from patients with rheumatoid arthritis and systemic lupus erythematosus.
abstract: The expression of a new activation antigen, T cell lineage specific activation antigen (TLiSA1) on peripheral blood T cells from 16 rheumatoid arthritis (RA) and 8 systemic lupus erythematosus (SLE) patients and synovial fluid T cells from RA patients was determined in the context of T cell activation. The percentages of TLiSA1 positive T cells from inactive (4.6 +/- 5.2, mean +/- SE) or active RA (19.3 +/- 8.6) or inactive (1.7 +/- 2.1) or active SLE (8.7 +/- 2.7) were significantly increased compared with that of normal controls (0.7 +/- 0.4) (P less than 0.01). All patients with vasculitis showed relatively high positive percentages. The mean fluorocytometric intensity of TLiSA1 positive T cells from RA and SLE patients was significantly higher than that from normals. Percentages of TLiSA1 positive T cells from synovial fluids (21.8 +/- 4.9%) were significantly increased compared with those from peripheral blood of the same patients, indicating the local activation of T cells in patients with RA. An increase in the expression of TLiSA1 with no increase in the expression of the very late activating antigen 1 (VLA-1) was found in peripheral blood from RA, suggesting a difference in the stage of T cell activation in RA. In RA, there was a clinical correlation with levels of TLiSA1 expression on peripheral T cells. After stimulation with PHA, TLiSA1 positive percentages were increased on Day 2 and continued to increase through 5 days of culture. The maximum expression was obtained on Day 5. An increased number of TLiSA1 positive T cells belonged to OKT8. These results suggest that there is the systemic and the local activation of T cells in RA, following antigen stimulation, or a generalized nonspecific activation of immune system that could provide a means to monitor the abnormal immunologic activity in RA.
authors: 1st Department of Internal Medicine, National Defense Medical College, Saitama, Japan.
authors: H
authors: H
authors: Tabata
authors: M
authors: M
authors: Hara
authors: A
authors: A
authors: Kitani
authors: T
authors: T
authors: Hirose
authors: K
authors: K
authors: Norioka
authors: M
authors: M
authors: Harigai
authors: K
authors: K
authors: Suzuki
authors: M
authors: M
authors: Kawakami
authors: M
authors: M
authors: Kawagoe
authors: H
authors: H
authors: Nakamura
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis*; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D002478:Cells, Cultured; D005434:Flow Cytometry; D006801:Humans; D007700:Kinetics; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*; D012016:Reference Values; D013582:Synovial Fluid / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte