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Maldonado MA, MacDonald GC, Kakkanaiah VN, Fecho K, Dransfield M, Sekiguchi D, Cohen PL, Eisenberg RA. Differential Control of Autoantibodies and Lymphoproliferation by Fas Ligand Expression on CD4+ and CD8+ T Cells In Vivo. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.163.6.3138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
We have previously shown that the gld autoimmune syndrome is suppressed in lethally irradiated gld mice reconstituted with a mixture of normal and gld bone marrow (BM). Furthermore, in vivo depletion of normal Thy-1+ cells restores lymphoproliferation and autoantibody production in such chimeras, suggesting that T cells bearing Fas ligand are responsible for correcting the gld defect. In this study, mixed-BM chimeras lacking either normal CD4+ (B6CD4KO-B6gld) or normal CD8+ T cells (B6CD8KO-B6gld) were generated to determine the contribution of the normal T cell subsets to disease suppression. Lymphoproliferation was completely suppressed in B6CD4KO-B6gld chimeras but only modestly in B6CD8KO-B6gld chimeras. On the other hand, both types of mixed-BM chimeras had incomplete effects on the suppression of serum autoantibodies when compared with B6gld reconstituted with isologous BM. These results suggest that both T cell subsets provide Fas ligand to suppress immune cells responsible for autoantibody production; however, CD8+ T cells are mainly responsible for preventing lymphoproliferation.
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Affiliation(s)
- Michael A. Maldonado
- *Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Glen C. MacDonald
- †Departments of Medicine and Microbiology/Immunology, University of North Carolina, Chapel Hill, NC 27599
| | - Vellalore N. Kakkanaiah
- †Departments of Medicine and Microbiology/Immunology, University of North Carolina, Chapel Hill, NC 27599
| | - Karamarie Fecho
- †Departments of Medicine and Microbiology/Immunology, University of North Carolina, Chapel Hill, NC 27599
| | - Mark Dransfield
- †Departments of Medicine and Microbiology/Immunology, University of North Carolina, Chapel Hill, NC 27599
| | - Debora Sekiguchi
- *Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Philip L. Cohen
- *Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Robert A. Eisenberg
- *Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104; and
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Sobel ES, Kakkanaiah VN, Schiffenbauer J, Reap EA, Cohen PL, Eisenberg RA. Novel Immunoregulatory B Cell Pathways Revealed by lpr-+ Mixed Chimeras. THE JOURNAL OF IMMUNOLOGY 1998. [DOI: 10.4049/jimmunol.160.3.1497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
lpr, a murine mutation of the Fas apoptosis receptor, causes lymphadenopathy and autoantibody production, with lymphadenopathy primarily due to a population of CD4−CD8−B220+ T cells. Previous in vivo experiments, in which lpr and normal bone marrow cells were coinfused into lpr hosts, have demonstrated that only T cells of lpr origin accumulated abnormally and only B cells of lpr origin produced autoantibodies. Moreover, in these chimeras, B cells of normal origin were unable to respond to conventional, T cell-dependent exogenous Ag. To address the role of lpr B cells in regulation of lpr autoimmunity, we have prepared lpr-+ mixed chimeras and selectively eliminated lpr B cells using allele-specific, mAb treatment, thus allowing normal B cells to develop in an environment with lpr T cells. From these data, we arrived at four major conclusions: 1) Compared with control-treated chimeric mice, lpr B cell-depleted mice had greatly reduced total lymph node cell counts; 2) the T cells were derived equally from normal and lpr donors, and the percentage of lpr-derived CD4−CD8− T cells was greatly reduced; 3) despite the presence of the remaining lpr T cells, no autoantibodies were produced by the normal derived B cells; and 4) lpr T cells without lpr B cells were unable to prevent a normal B cell response to conventional Ag. These data demonstrate that B cells can play a critical and expansive regulatory role, not only for T cells, but for other B cells as well.
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Affiliation(s)
- Eric S. Sobel
- *Department of Medicine and Division of Rheumatology and Clinical Immunology, University of Florida, Gainesville, FL 32610; and
| | - Vellalore N. Kakkanaiah
- †Department of Medicine and Microbiology/Immunology, University of North Carolina, Chapel Hill, NC 27599
| | - Joel Schiffenbauer
- *Department of Medicine and Division of Rheumatology and Clinical Immunology, University of Florida, Gainesville, FL 32610; and
| | - Elizabeth A. Reap
- †Department of Medicine and Microbiology/Immunology, University of North Carolina, Chapel Hill, NC 27599
| | - Philip L. Cohen
- †Department of Medicine and Microbiology/Immunology, University of North Carolina, Chapel Hill, NC 27599
| | - Robert A. Eisenberg
- †Department of Medicine and Microbiology/Immunology, University of North Carolina, Chapel Hill, NC 27599
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