Abstract
Patients with primary IgA nephropathy have deposits of IgA1 in their kidneys and increased IgA1 in circulation. We had previously shown that IgA nephritic patients displayed a unique immunological response characterized by a predominance of IgA with lambda chain in glomerular deposits and in circulation. We have now studied the kappa/lambda (κ/λ) ratio of serum IgA1 in 21 IgA nephritic patients at quiescence, with 11 patients investigated during exacerbation as well. A novel enzyme-linked immunosorbent assay was used with monoclonal mouse anti-human IgA1 as the solid-phase capture antibody and peroxidase-labeled anti-human kappa and lambda antibodies as tracers. The ratio of serum IgA1 to total IgA (mean ± SD) was significantly higher in patients (90.1±8.2% at quiescence,P<0.01; 88.7±8.1% during exacerbation,P<0.02) than in 20 healthy age- and sex-matched controls (80.0±9.8%). Furthermore, serum IgA1 kappa/lambda ratios were significantly lower in patients (1.02±0.27 at quiescence,P<0.01; 0.93±0.16 during exacerbation,P<0.01) than in controls (1.31±0.30). These findings indicate a predominance of lambda light-chain IgA1 in the serum of IgA nephritic patients. However, no difference in IgA1 kappa/lambda ratio was observed in these patients at quiescence and during exacerbation.
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References
Berger J: IgA glomerular deposits in renal disease. Transplant Proc. 1:939–944, 1969
Conley ME, Cooper MD, Michael AF: Selective deposition of immunoglobulin A1 in immunoglobulin A nephropathy, anaphylactoid purpura nephritis, and systemic lupus erythematosus. J Clin Invest 66:1432–1436, 1980
Tomino Y, Endoh M, Nomoto Y, Sakai H: Immunoglobulin A1 in IgA nephropathy. N Engl J Med 305:1159–1160, 1981
Murakami T, Furuse A, Hattori S, Kobayashi K, Matsuda I: Glomerular IgA1 and IgA2 deposits in IgA nephropathies. Nephron 35:120–123, 1983
Morell A, Skvaril F, Noseda G, Barandun S: Metabolic properties of human IgA subclasses. Clin Exp Immunol 13:521–528, 1973
Conley ME, Koopman WJ: Serum IgA1 and IgA2 in normal adults and patients with systemic lupus erythematosus and hepatic disease. Clin Immunol Immunopathol 26:390–397, 1983
van den Wall Bake AWL, Daha MR, van der Ark A, Hiemstra PS, Radl J, van Es LA: Serum levels and in vitro production of IgA subclasses in patients with primary IgA nephropathy. Clin Exp Immunol 74:115–120, 1988
van den Wall Bake AWL, Daha MR, Haaijman JJ, van der Ark A, Valentijn RM, van Es LA: The bone marrow as production site of the IgA deposited in the kidneys of patients with IgA nephropathy. Clin Exp Immunol 72:321–325, 1988
van den Wall Bake AWL, Daha MR, Evers-Schouten J, van Es LA: Serum IgA and the production of IgA by peripheral blood and bone marrow lymphocytes in patients with primary IgA nephropathy: Evidence for the bone marrow as the source of mesangial IgA. Am J Kidney Dis 7:410–414, 1988
Lai KN, Chan KW, Lai FM, Ho CP, Yan KW: The immunochemical characterization of the light chains in the mesangial IgA deposits in IgA nephropathy. Am J Clin Pathol 85:548–551, 1986
Lai KN, Lai FM, Lo STH, Lam CWK: Light chain composition of IgA in IgA nephropathy. Am J Kidney Dis 11:425–429, 1988
Lai KN, Chiu SH, Lai FM, Lam CWK: Predominant synthesis of IgA with lambda light chain in IgA nephropathy. Kidney Int 33:584–589, 1988
Hale GM, McIntosh SL, Hiki Y, Clarkson AR, Woodroffe AJ: Evidence for IgA-specific B cell hyperactivity in patients with IgA nephropathy. Kidney Int 29:718–724, 1986
Chui SH, Lam CWK, Lai KN: Light chain ratios of immunoglobulins G, A, and M determined by enzyme immunoassay. Clin Chem 36:501–502, 1990
Clarkson AR, Seymour AE, Thompson AJ, Haynes WDG, Chan YL, Jackson B: IgA nephropathy: A syndrome of uniform morphology, diverse clinical features and uncertain prognosis. Clin Nephrol 8:459–471, 1977
Woodroffe AJ, Gormly AA, McKenzie PE, Wooton AM, Thompson AJ, Seymour AE, Clarkson AR: Immunological studies in IgA nephropathy. Kidney Int 18:366–376, 1980
Delacroix DL, Elkon KB, Geubel AP, Hodgson HF, Dive C, Vaerman JP: Changes in size, subclass, and metabolic properties of serum immunoglobulin A in liver diseases and in other diseases with high serum immunoglobulin A. J Clin Invest 71:358–367, 1983
Lomax-Smith J, Zabrownarny LA, Howarth G, Seymour AE, Woodroffe AJ: The immunochemical characteristics of mesangial IgA deposits. Am J Pathol 113:359–364, 1983
Bene MC, Faure GC: Mucosal immunity and IgA nephropathy. Semin Nephrol 7:297–300, 1987
Orfila C, Rakotoarivony J, Manuel Y, Suc JM: Immunofluorescence characterization of light chains in human nephropathies. Virchows Arch A 412:591–594, 1988
Jennette JC: The immunohistology of IgA nephropathy. Am J Kidney Dis 12:348–352, 1988
Andrew DW, Cepra JD: Structure and function of immunoglobulins.In Clinical Immunology, CW Parker (ed). Philadelphia, WB Saunders, 1980, pp 1–18
Monteiro RC, Haibwachs-Mecarelli L, Roque-Barriera MC, Noel LH, Berger J, Lesavre P: Charge and size of mesangial IgA in IgA nephropathy. Kidney Int 28:666–671, 1985
Chui SH, Lam C, Lai KN: Charge distribution of IgA subclasses in IgA nephropathy. J Am Soc Nephrol 1:558A, 1990
Conley ME, Delacroix DL: Intravascular and mucosal immunoglobulin A: two separate but related systems of immune defence? Ann Intern Med 106:892–899, 1987
Kutteh WH, Koopman WJ, Conley ME, Egan ML, Mestecky: Production of predominantly polymeric IgA by human peripheral blood lymphocytes stimulated in vitro with mitogens. J Exp Med 152:1424–1427, 1980
Lai KN, Leung JCK, Lai FM: In vitro study of expression of interleukin-2 receptors in T lymphocytes from patients with IgA nephropathy. Clin Nephrol 30:330–334, 1988
Lai KN, Leung JCK, Lai FM, Tam JS: Early T lymphocyte activation in IgA nephropathy: Soluble interleukin 2 receptor (IL2R) production, cellular IL2R expression and interleukin 2 release. J Clin Immunol 9:485–492, 1989
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Chui, S.H., Lam, C.W.K., Lewis, W.H.P. et al. Light-chain ratio of serum IgA1 in IgA nephropathy. J Clin Immunol 11, 219–223 (1991). https://doi.org/10.1007/BF00917428
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DOI: https://doi.org/10.1007/BF00917428