Selective suppression of autoantibody responses in NZB/NZW MICE treated with long‐term cyclophosphamide

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Abstract
Autoimmune responses were assayed in 80 cyclophosphamide-treated and control NZB/NZW mice over a period of 1 year. Fluctuation between positive and negative immunofluorescent heterogeneous ANA tests and daily alterations of ANA titers were detected in young mice of both sexes. Although highdose cyclophosphamide therapy (8 mg/kg/day) failed to prevent the spontaneous appearance of ANA, titered ANA values were partially suppressed in highdose treated mice. This study permitted sequential comparisons between ANA titers and anti-DNA as useful indices of cyclophosphamide-induced suppression of autoimmune disease. ANA titers were relalively resistant to cyclophosphamide therapy. Antibodies directed specifically against DNA were suppressed in mice receiving high-dose cyclophosphamide. In treated animals, decreased anti-DNA levels were associated with protection from severe glomerulonephritis and renal vasculitis. Treatment with lowdose cyclophosphamide (1 mg/kg/day) appeared paradoxically to stimulate autoantibody production and renal disease/vasculitis.