Abstract
When administered by various routes 48 h before a high systemic dose (10 degrees) of sheep red blood cells (SRBC), Cyclosporin A (CsA) prevented the suppression of delayed-type hypersensitivity (DTH) reactions elicited 4 days later. Augmentation of DTH was observed over a wide range (5-200 mg/kg) and with circulating CsA levels ranging below 45 ng/ml at the time of immunization or antigen challenge. Splenic lymphocytes from vehicle- and CsA-treated mice exhibited good proliferative responses to mitogen in vitro, but only those from CsA-treated animals responded to antigen. Expression of DTH was associated with a progressive, 2-fold increase in the absolute numbers of splenic L3T4+ cells, whereas no significant alteration in the number of Lyt-2+ lymphocytes was recorded. B cell and macrophage numbers in the spleen were unaffected by CsA. In contrast to its potentiating effects on cell-mediated immunity, CsA caused profound (up to 100%) suppression of the concomitant production of splenic anti-SRBC IgM-secreting plasma cells. Circulating anti-SRBC antibody levels were also markedly reduced. These data show that CsA can permit induction of TDTH, whilst suppressing T-dependent humoral immunity and without significant change in absolute numbers of Lyt-2+ cells.
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