The Japanese Journal of Nephrology
Online ISSN : 1884-0728
Print ISSN : 0385-2385
Immunological study of IgA nephropathy
-Relationship between T cell function, monocyte and circulating immune complex-
YOSHIYUKI OHZONO
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1987 Volume 29 Issue 8 Pages 961-972

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Abstract
In order to verify whether cell mediated immunity and circulating immune complexes play a role in the pathogenesis of IgA nephropathy, cell mediated immunity was studied in T cell, B cell subsets, T cell function and the influence of monocytes on immuno-globulin production in patients with IgA nephropathy. CIC were measured by using Clq EIA and anti C3 EIA. Relation between CIC and T cells and monocytes were also studied. The results were followed as. 1) The percentage of Leu 2a cells in peripheral lymphocytes was significantly lower and that of Leu 3a cells higher in patients with IgA nephropathy compared with other groups, meaning that an elevated Leu 3a/Leu 2a cell ratio was observed in patients with IgA nephropathy. 2) IgA T cell helper activity was significantly elevated and IgG and IgM T cell helper activity were also slightly elevated in patients with IgA nephropathy. 3) The higher incidence of IgA immune complex was observed in patients with IgA nephropathy compared with other groups. 4) IgA T cell helper activity in patients with positive IgA-IC was significantly more elevated than in patients with negative IgA-IC. 5) The percentage of monocytes which IgA granular deposits were detected in the cytoplasma or on the cell surface in patients with IgA nephropathy was signficantly higer than in healthy subjects. 6) An enhancement of IgA production was observed when monocytes from patients with IgA nephropathy were added into pokeweed mitogen stimulated coculure with T cells and B cells from healthy subjects. 7) An enhancement of IgA production by T cells treated with IgA-IC was observed compared with T cells treated with IgG-IC or IgM-IC, 8) An enhancement of IgA production by monocytes treated with IgA-IC from IgA nephropathy patients was revealed compared with monocytes treated with IgG-IC or IgM-IC.
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