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Enhanced lymphoproliferation and diminished autoimmunity in CD4-deficient MRL/lpr mice
M S Chesnutt1, B K Finck, N Killeen
1Department of Medicine, Department of Veterans Affairs Medical Center, San Francisco, California 94121, USA.
Clinical Immunology and Immunopathology
|May 12, 1998
Summary
CD4 deficiency in MRL/lpr mice enhances double-negative T cell expansion but reduces autoantibody production, impacting lupus nephritis development through both CD4-dependent and independent pathways.
Area of Science:
- Immunology
- Autoimmunity
- T cell biology
Background:
- MRL/lpr mice spontaneously develop autoimmune disease resembling systemic lupus erythematosus.
- These mice exhibit lymphoproliferative disorder with massive accumulation of double-negative (DN) T cells (lacking CD4 and CD8).
Purpose of the Study:
- To investigate the role of CD4 in autoimmunity and lymphoproliferation in MRL/lpr mice.
- To elucidate the mechanisms underlying nephritis development in the absence of CD4.
Main Methods:
- Generation of CD4-deficient MRL/lpr mice.
- Analysis of T cell populations (DN T cells), autoantibody production (anti-double-stranded DNA), survival rates, and kidney pathology (nephritis).
Main Results:
- CD4-deficient MRL/lpr mice showed significantly greater DN T cell expansion compared to controls.
- Autoantibody production was minimal in CD4-deficient mice, correlating with prolonged survival.
- Despite reduced autoantibodies, CD4-deficient mice developed nephritis involving immunoglobulin/complement deposition, vasculitis, and CD8+ T cell infiltration.
Conclusions:
- Lymphoproliferation in MRL/lpr mice is CD4-independent.
- Autoantibody production is CD4-dependent and not solely driven by DN T cell accumulation.
- Nephritis development involves both CD4-dependent and CD4-independent mechanisms in MRL/lpr mice.