1996 Fiscal Year Final Research Report Summary
Role of CD4^+CD28^-T cell subset in patients with Systemic Lupus Erythematosus
| Project/Area Number |
07670547
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
内科学一般
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| Research Institution | ST.MARIANNA UNIVERSITY SCHOOL OF MEDICINE |
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Principal Investigator |
SUZUKI Noboru St.Marianna University School of Medicine, Institute of Medical Science, Senior Associate Professor, 難病治療研究センター, 助教授 (40235982)
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| Project Period (FY) |
1995 – 1996
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| Keywords | CD28 / accessory molecule / Tlymphocytes / helper T cells / systemic lupus erythematosus / oligoclonal / activation / HLA-DR |
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| Research Abstract |
Systemic lupus erythematosus (SLE) is characterized by B cell hyperactivity and defects of immunoregulatory T cells. CD28 antigen is an accessory molecule, that transduces a potent costimulatory signal for cell activation, and is expressed on the vast majority of CD4_+ T cells. It has been reported that CD4_+CD28_- T cells were refractory to anergy induction and showed sustained reactivity to the self antigen, suggesting involvement of CD4_+CD28_- T cells in the pathogenesis of autoimmune diseases. We found that CD4_+ CD28_- T cells are prevalent in peripheral blood in patients with SLE.This T cell subset expressed HLA-DR,IL-2 receptor, VLAbeta chain brightly, indicating that this subset locates in a late stage of T cell activation cascade. We found that CD4_+ CD28_- T cells exhibited oligoclonal expansion of the selected clones. In addition, CD4_+ CD28_- T cells produced large amounts of IL-6 spontaneously. These results suggest that SLE CD4_+CD28_- T cells have been activated by unidentified, possibly self, antigen in vivo and participate in the pathogenesis of human SLE.
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[Publications] Takeno, M., Nagafuchi, H., Kaneko, S., Wakisaka, S., Oneda, K., Takeba.Y., Yamashita, N., Suzuki, N., Kaneoka, H., and Sakane, T.: "Autoreactive T cell clones from patients with SLE support polyclonal autoantibody production" The Journal of Immunology. (in press). (1997)
Description
「研究成果報告書概要(欧文)」より
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