Hyperexpression of CD40 ligand by B and T cells in human lupus and its role in pathogenic autoantibody production.

Abstract

We investigated the role of the costimulatory molecules, CD40 and its ligand CD40L, in the pathogenesis of human SLE.In comparison to normal subjects or patients in remission, PBMC from active lupus patients had a 21-fold increase in the frequency of CD40L-expressing, CD4 ϩ T cells.However, the expression of CD40L induced in either lupus or normal T cells by mitogenic stimulation could be downregulated equally well by CD40 molecules on autologous B cells.Active lupus patients also had a 22-fold increase in percentage of CD8 ϩ T cells expressing CD40L, consistent with their unusual helper activity in SLE.Surprisingly, patients with active lupus had a 20.5-fold increase in B cells that spontaneously expressed high levels of CD40L, as strongly as their T cells.Although lupus patients in remission had low levels of CD40L ϩ cells in the range of normal subjects, mitogen-induced upregulation of CD40L expression in their T and B cells was markedly greater than normal, suggesting an intrinsic defect.A mAb to CD40L blocked significantly the ability of lymphocytes from lupus patients with active and established disease to produce the pathogenic variety of antinuclear autoantibodies in vitro, bolstering the possibility of anti-CD40L immunotherapy for lupus.Future studies on the hyperexpression of CD40L could elucidate a regulatory defect in the pathogenic T and B cells of lupus.( J. Clin.Invest.1996.97:2063-2073.)Key words: system lupus erythematosus • anti-DNA autoantibodies • autoimmune disease • CD40 ligand expression • immunotherapy MethodsPatients and healthy donors.Eight patients with active lupus (seven females and one male; aged 18-50 yr), seven patients in long-term remission (all females; aged 21-51 yr) and six normal (healthy) subjects