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Effects of lymphocytotoxins of systemic lupus erythematosus (SLE) sera on T and B lymphocytes.

SLE lymphocytotoxins can be demonstrated on the lymphocytes by immunofluorescence. Complement addition lyses the cells covered with LCT. The proportion of B and T cells as determined by surface immunoglobulins and spontaneous rosette formation of lymphocytes from healthy donors remains unchanged after LCT and complement treatment. The proportion of B and T cells of SLE lymphocytes was altered after cell lysis. The B cells seemed to be relatively resistant, and the T cells more susceptible, to autologous LCT. Thus the relative decrease in the number of T cells in active SLE may be the consequence of surface bound LCT with its effect on the circulating T cells.