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HLA Bw35 antigen and mesangial IgA glomerulo-nephritis: a poor prognosis marker?
Abstract:
Familial cases of mesangial IgA glomerulonephritis (MGN) have raised the possibility of a genetic control in this disease. In 50 patients with MGN, diagnosed on renal biopsy, and in 105 controls, we have compared the distribution of HLA antigens (A and B loci). We found a significant increase in the frequency of HLA Bw35 antigen in the patient group compared with controls (36% versus 13%: p less than 0.02). There was no significant difference between the Bw35 positive and negative MGN subgroups, in clinical, serological, and pathological data. Both subgroups had elevated mean serum IgA levels (154% of normal), and also mean serum IgM levels (146%). However, the follow-up data exhibited a significantly worse prognosis (p less than 0.01) in the Bw35 positive subgroup: 9 out of 18 patients versus 4 out of 32 progressed to chronic renal failure (serum creatinine greater than 1.5 mg/dl). We have established a genetic linkage between the HLA complex and the occurrence of MGN. The Bw35 antigen may serve as a marker (risk of disease = 4), in particular for poor prognosis cases.
Insights
Genetic factors influence mesangial IgA glomerulonephritis (MGN). The HLA Bw35 antigen is linked to increased MGN risk and poorer prognosis, suggesting it as a potential disease marker.
Area of Science:
- Immunogenetics
- Nephrology
- Human Leukocyte Antigen (HLA) system
Background:
- Familial clustering of mesangial IgA glomerulonephritis (MGN) suggests a genetic component.
- Human Leukocyte Antigen (HLA) antigens are critical for immune regulation and have been implicated in various autoimmune diseases.
Purpose of the Study:
- To investigate the association between HLA antigen distribution and the occurrence of MGN.
- To determine if specific HLA antigens correlate with clinical presentation, serological markers, or prognosis in MGN patients.
Main Methods:
- A case-control study comparing HLA antigen frequencies at the A and B loci in 50 MGN patients and 105 healthy controls.
- Analysis of clinical, serological (serum IgA and IgM levels), and pathological data.
- Longitudinal follow-up to assess patient prognosis, specifically progression to chronic renal failure.
Main Results:
- A significantly higher frequency of the HLA Bw35 antigen was observed in MGN patients compared to controls (36% vs. 13%, p<0.02).
- No significant differences in clinical, serological, or pathological features were found between Bw35-positive and Bw35-negative MGN subgroups.
- Patients with the Bw35 antigen showed a significantly worse prognosis, with a higher rate of progression to chronic renal failure (9/18 vs. 4/32, p<0.01).
Conclusions:
- A genetic linkage exists between the HLA complex and the development of MGN.
- The HLA Bw35 antigen may serve as a genetic marker for MGN, particularly for identifying patients at risk of a poor prognosis.