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Apoptosis in SLE--too little or too much?
1Specialized Center of Research (SCOR) in SLE, Hospital for Special Surgery, Cornell University Medical College, New York, NY 10021.
Clinical and Experimental Rheumatology
|September 1, 1994
Summary
Immune cells undergo programmed cell death unless activated. Defects in the Fas/APO-1 pathway, crucial for immune tolerance, can lead to lupus-like diseases in mice.
Area of Science:
- Immunology
- Cell Biology
- Autoimmunity
Background:
- Immune system cells are programmed for death unless activated by immune responses.
- Soluble and surface signals can induce active cell death pathways.
- These pathways are critical for maintaining self-tolerance.
Purpose of the Study:
- To investigate the role of Fas/APO-1 pathway in immune tolerance.
- To understand the implications of Fas/APO-1 defects in autoimmune diseases like lupus.
Main Methods:
- Analysis of mouse models with spontaneous mutations in the Fas/APO-1 receptor or its ligand.
- Examination of immune cell persistence in relation to Fas/APO-1 function.
- Comparison of Fas/APO-1 pathway in humans with Systemic Lupus Erythematosus (SLE).
Main Results:
- Mutations in Fas/APO-1 or its ligand cause lupus-like diseases in mice.
- Fas/APO-1 signaling defects explain the persistence of self-reactive cells in lpr mice.
- Fas/APO-1 receptor expression is normal in human SLE, suggesting other pathway defects.
Conclusions:
- The Fas/APO-1 pathway is vital for immune tolerance, and its defects contribute to autoimmunity.
- Further research is needed to identify other molecular defects in the Fas/APO-1 pathway or cell death/survival pathways in SLE.