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Lymphocytes, cytokines, inflammation, and immune trafficking
G C Tsokos1, B Kovacs, S N Liossis
1Department of Clinical Physiology, Walter Reed Army Institute of Research, Washington, DC 20307-5100, USA.
Current Opinion in Rheumatology
|October 6, 1997
Summary
New research on systemic lupus erythematosus (SLE) identifies a chromosome 1q41-42 linkage and reveals altered B-cell and T-cell signaling pathways contributing to the autoimmune disease.
Area of Science:
- Immunology
- Genetics
- Rheumatology
Background:
- Systemic lupus erythematosus (SLE) pathogenesis involves complex immune dysregulation.
- Recent studies have elucidated novel genetic and cellular mechanisms underlying SLE.
Purpose of the Study:
- To summarize recent advancements in understanding SLE pathogenesis.
- To highlight key findings in genetic linkage and immune cell function in SLE patients.
Main Methods:
- Analysis of sibpairs for genetic linkage studies.
- Flow cytometry and biochemical assays to assess immune cell signaling.
- Evaluation of Fas antigen and ligand expression and T-cell apoptosis.
Main Results:
- A significant linkage region at chromosome 1q41-42 was identified in lupus sibpairs.
- Elevated B-cell receptor signaling (tyrosine phosphorylation, intracellular calcium) was observed independently of disease activity.
- Increased CD40 ligand on T cells enhances B-cell antibody production and CD80 expression; defective activation-induced T-cell death was noted.
Conclusions:
- Genetic factors on chromosome 1q41-42 contribute to SLE susceptibility.
- Aberrant B-cell and T-cell signaling pathways are implicated in SLE pathogenesis.
- While spontaneous apoptosis is increased, impaired T-cell death regulation may exacerbate autoimmunity in SLE.