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Increased immunoglobulin A and immunoglobulin A1 cells in bone marrow trephine biopsy specimens in immunoglobulin A nephropathy

Increased immunoglobulin A and immunoglobulin A1 cells in bone marrow trephine biopsy specimens in immunoglobulin A nephropathy

American Journal of Kidney Diseases 24(6): 888-892

The origin of mesangial immunoglobulin A (IgA) in IgA nephropathy remains unknown. To investigate potential abnormalities within the bone marrow in this condition, bone marrow trephine biopsy specimens from seven patients and matched controls were studied using two-color immunofluorescence. In addition, serum levels of IgA and IgA1 were determined by radial immunodiffusion. Serum levels of IgA and IgA1 were higher in patients than in controls (4.53 +/- 1.38 g/L v 2.56 +/- 1 g/L, P < 0.01 and 3.68 +/- 1.11 g/L v 1.92 +/- 0.7 g/L, P < 0.005, respectively). In addition, patient trephine biopsy specimens contained an increased percentage of IgA plasma cells (61.6% +/- 4.4%) compared with controls (47.3% +/- 2.5%) (P < 0.02). The proportion of IgA plasma cells bearing subclass IgA1 was also greater in the patient biopsy specimens (91.6% +/- 1.9%) compared with controls (81.4% +/- 2.7%) (P < 0.01). In patients a positive correlation between the percentage of marrow IgA plasma cells and serum IgA levels was found (r = 0.94, P < 0.002). However, our studies failed to demonstrate a similar correlation between serum IgA1 levels and IgA1 marrow cells. These findings support the hypothesis that mesangial IgA may derive from the bone marrow.

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Accession: 046376574

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PMID: 7985665

DOI: 10.1016/s0272-6386(12)81056-0

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