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A pathogenic role for secretory IgA in IgA nephropathy
B D Oortwijn1, P J M van der Boog, A Roos
1Department of Nephrology, Leiden University Medical Center, Leiden, The Netherlands.
Secretory IgA (SIgA) binds strongly to human mesangial cells and accumulates in IgA nephropathy (IgAN) glomeruli. These findings suggest a significant role for SIgA in IgAN pathogenesis.
Area of Science:
- Nephrology
- Immunology
- Pathogenesis of kidney disease
Background:
- IgA nephropathy (IgAN) is defined by IgA deposits in the renal mesangium, primarily thought to involve high molecular weight IgA1.
- Limited data exists on the precise composition of these high molecular weight IgA deposits.
Purpose of the Study:
- To investigate the presence and role of secretory IgA (SIgA) in IgA nephropathy.
- To analyze the interaction of SIgA with human mesangial cells and its accumulation in IgAN glomeruli.
Main Methods:
- Enzyme-linked immunosorbent assay (ELISA) to quantify SIgA in serum of IgAN patients and controls.
- Flow cytometry to assess the binding of SIgA to mesangial cells.
- Isolation and elution of glomerular SIgA from a patient with recurrent IgAN.
Main Results:
- Circulating SIgA was found in both IgAN patients and controls, predominantly in high molecular weight fractions.
- Serum SIgA levels showed a trend towards higher concentrations in IgAN patients and correlated with hematuria.
- SIgA demonstrated stronger binding to mesangial cells than serum IgA.
- A significant 120-fold accumulation of SIgA was observed in the glomeruli of an IgAN patient compared to IgA1.
Conclusions:
- Secretory IgA (SIgA) binds effectively to human mesangial cells.
- SIgA is present in significant serum concentrations and accumulates within the glomeruli of IgAN patients.
- These findings highlight a potential critical role for SIgA in the development and progression of IgA nephropathy.
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