Abstract
Immunoregulation was examined in normal controls and in patients with immune complex glomerulonephritis and lupus nephritis (SLE) using OKT monoclonal anti-bodies against helper (OKT4) and suppressor (OKT8) T cell subsets. Functional studies assessed T cell control of in vitro immunoglobulin synthesis by cultured peripheral blood mononuclear cells (PBMC). IgG and IgA synthesis was measured in unstimulated, pokeweed mitogen (PWM) stimulated and PWM + concanavalin A (Con A) stimulated cultures. Patients with primary membranous nephropathy (MN) and mesangial IgA nephropathy (IgA GN) were found to have elevated T4/T8 ratios secondary to a deficiency of the T8+ subset. Patients with SLE had low T4/T8 ratios. B cell activation with high spontaneous immunoglobulin synthesis was present in cell cultures from patients with SLE, IgA GN and Henoch-Schonlein purpura (HSP). Defective Con A inducible suppression of in vitro immunoglobulin synthesis was found in SLE, HSP and to a lesser extent, primary MN. Functional Con A inducible suppressor defects correlated with elevated T4/T8 ratios only in patients with MN. All four disorders appear to share disturbances of cellular immune response with various degrees of defective immune suppression; however, it is not clear from these studies whether the defects are primary or secondary phenomena.
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