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Regression of IgA nephropathy: a repeat biopsy study.
Osamu Hotta1, Takashi Furuta, Shigemi Chiba
1Department of Nephrology, Sendai Shakaihoken Hospital, Sendai, Japan. hottao@remus.dti.ne.jp
Summary
Histological cure of immunoglobulin A (IgA) nephropathy is possible in adults. Repeat biopsies showed significant reduction in mesangial proliferation and inflammation after treatment, indicating reversibility.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Immunoglobulin A (IgA) nephropathy is a common glomerular disease.
- Histological cure in adult IgA nephropathy is rarely documented.
- Reversibility of established IgA nephropathy requires further investigation.
Purpose of the Study:
- To investigate the potential for histological remission in adult IgA nephropathy.
- To assess the reversibility of IgA nephropathy following a specific treatment protocol.
Main Methods:
- A repeat biopsy study was conducted on 35 adult patients with IgA nephropathy.
- Patients received high-dose methylprednisolone and tonsillectomy.
- Second biopsies were performed after hematuria and/or proteinuria resolution, 18-138 months post-initial biopsy.
Main Results:
- Significant reduction in mesangial proliferation scores (2.49 to 0.91).
- Complete resolution of acute inflammatory glomerular lesions (endocapillary proliferations, necrosis, crescents).
- Marked decrease in interstitial mononuclear cell infiltration and interstitial fibrosis/edema.
Conclusions:
- Established IgA nephropathy demonstrates considerable histological reversibility.
- Mesangial proliferation and interstitial changes can significantly improve.
- Histological cure is achievable in a substantial proportion of patients, particularly with early intervention.