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Bone marrow IgA and IgA subclass synthesis in ankylosing spondylitis
A J Peeters1, M R Daha, T J Smeets
1Department of Rheumatology, University Hospital, Leiden, The Netherlands.
The Journal of Rheumatology
|May 1, 1992
Summary
Ankylosing spondylitis (AS) patients show elevated serum immunoglobulin A (IgA). Bone marrow cell synthesis reveals a shift towards IgA1, suggesting abnormal mucosal immunity contributes to IgA overproduction in AS.
Area of Science:
- Immunology
- Rheumatology
- Biochemistry
Background:
- Elevated serum immunoglobulin A (IgA) is observed in ankylosing spondylitis (AS).
- The precise source and subclass regulation of IgA overproduction in AS remain unclear.
- Understanding IgA dynamics is crucial for AS pathogenesis research.
Purpose of the Study:
- To investigate the origin of increased IgA production in AS.
- To analyze IgA and IgA subclass production in bone marrow cells from AS patients.
- To compare IgA subclass distribution in serum and bone marrow between AS patients and healthy controls.
Main Methods:
- Studied IgA and IgA subclass production in bone marrow cell cultures.
- Quantified IgA and IgA subclass-containing cells in bone marrow.
- Analyzed serum IgA and IgA subclass levels in 24 AS patients and 22 controls.
Main Results:
- AS patients exhibited significantly higher serum IgA, IgA1, and IgA2 levels than controls.
- The IgA1 subclass contributed less to total serum IgA in AS patients compared to controls.
- Bone marrow cell cultures from AS patients showed a significant shift in immunoglobulin synthesis towards IgA1.
Conclusions:
- Regulatory abnormalities in IgA production, involving both IgA1 and IgA2 subclasses, are implicated in AS.
- Findings suggest an abnormal mucosal immune response may drive chronic IgA overproduction in AS.
- This research sheds light on the immunopathogenesis of ankylosing spondylitis.