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Complex CD44 splicing combinations in synovial fibroblasts from arthritic joints
European Journal of Immunology
|July 1, 1997
Summary
CD44 splice variants are present in inflamed joints, but not in normal tissue. Their expression levels vary between rheumatoid and osteoarthritis, suggesting a link between CD44 alternative splicing and synovial joint inflammation.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- CD44 is a cell surface glycoprotein and the primary receptor for hyaluronan.
- Alternative splicing of CD44 mRNA, along with post-translational modifications, generates diverse CD44 isoforms with varying functions.
- CD44 splice variants have implications in various disease states.
Purpose of the Study:
- To investigate CD44 splice variant expression in synovial fibroblasts from patients with osteoarthritis and rheumatoid arthritis.
- To compare CD44 splice variant expression in inflamed versus non-inflamed synovial tissue.
Main Methods:
- Isolation of VCAM-1-positive synovial fibroblasts from patients with osteoarthritis, rheumatoid arthritis, and normal controls.
- Analysis of CD44 splice variant expression at both the cell surface and mRNA levels.
Main Results:
- CD44 splice variants were detected at the cell surface and mRNA levels in rheumatoid and osteoarthritic tissues.
- Specific variant exons (v3, v6, v7, v8, v9, v10) were found in various combinations in inflamed tissues.
- Non-inflamed synovial tissue showed no CD44 splicing events.
- Rheumatoid arthritis tissue exhibited high CD44 splice variant expression, while osteoarthritis showed significant variation.
Conclusions:
- CD44 splice variant expression is associated with the inflammatory status of the synovial joint.
- The specific patterns of CD44 alternative splicing may serve as biomarkers for joint inflammation.