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pubmed-article:3409549pubmed:abstractTextPatients with primary IgA nephropathy have increased plasma levels of polymeric IgA1 and deposits of IgA1 in their kidneys. The origin of this material is unknown. The production of IgA and its subclasses was investigated in the bone marrow of 14 patients and 19 controls using two colour immunofluorescence and tissue culture. Patients had an increase in the percentage of plasma cells containing IgA (45.8 +/- 7.2 mean +/- s.d.) compared to controls (40.1 +/- 10.5) (P = 0.08). IgA plasma cells containing subclass IgA1 were significantly (P less than 0.01) increased in patients (89.9 +/- 2.7%) compared to controls (84.1 +/- 6.7%). Correspondingly IgA plasma cells containing subclass IgA2 were significantly decreased (P less than 0.01) in patients (7.4 +/- 3.0%) compared to controls (13.5 +/- 5.9%). Production of IgA in bone marrow culture in patients was increased (1,684 +/- 1,151 ng/culture) compared to controls (1,087 +/- 937), but this difference was not significant (P = 0.2). However, in patients the IgA1 subclass contributed significantly (P less than 0.01) more to the IgA synthesis in culture (ratio of IgA1 over IgA: 0.96 +/- 0.02) than in controls (ratio 0.90 +/- 0.06). These findings suggest that the bone marrow may well be the site of long-term overproduction of the IgA1 found in the circulation and mesangial deposits in IgA nephropathy.lld:pubmed
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pubmed-article:3409549pubmed:articleTitleThe bone marrow as production site of the IgA deposited in the kidneys of patients with IgA nephropathy.lld:pubmed
pubmed-article:3409549pubmed:affiliationDepartment of Nephrology, University Hospital, Leiden, The Netherlands.lld:pubmed
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