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Immunoglobulin G subclass 3 in ISN/RPL lupus nephritis classification
Clinical Nephrology
|November 16, 2018
Summary
Immunoglobulin G subclass 3 (IgG3) deposition in kidney capillary loops is linked to lupus nephritis activity. This finding highlights IgG3
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Immune complexes are critical in lupus nephritis progression.
- Immunoglobulin G subclass 3 (IgG3) may contribute to endothelial damage in lupus nephritis.
Purpose of the Study:
- To investigate the association between IgG3 positivity and lupus nephritis activity.
Main Methods:
- Analyzed 71 kidney biopsies from 57 lupus nephritis patients using light and immunofluorescence microscopy.
- Compared IgG subclass staining intensity and dominance with ISN/RPS 2003 classification.
- Assessed correlation between IgG3 deposition and C1q deposition in capillary loops.
Main Results:
- IgG3 positivity was significantly higher in class IV lupus nephritis patients with capillary loop lesions (p < 0.01).
- In class IV, IgG3 was the dominant subclass in 21% of biopsies.
- IgG3 deposition in capillary loops correlated with C1q deposition; renal survival showed a non-significant trend towards lower rates with IgG3 deposition.
Conclusions:
- Capillary loop deposition of IgG3 is associated with disease activity in lupus nephritis.
- IgG3 may play a role in the pathogenesis of lupus nephritis, particularly in class IV.
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