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The effect of recombinant human interleukin-2 (rIL-2) on the course of experimental chronic respiratory tract infection caused by Klebsiella pneumoniae in mice was examined. rIL-2 was administered subcutaneously once a day for 7 or 14 days, starting 2 weeks after the mice were infected. Administration of 2 or 20 micrograms of rIL-2 per mouse daily for 7 days reduced bacterial counts in the lungs dose dependently. At a dose of 0.2 microgram per day, proliferation of bacteria in the lungs was suppressed after 14 days of administration. Agglutinin titers in serum were not affected by rIL-2 treatment. Monocyte and lymphocyte counts in peripheral blood were increased by administration of 20 micrograms of rIL-2 daily for 14 days but not by treatment for 7 days. In addition, clearance of bacteria from the lungs after aerosol exposure was enhanced by treatment for 7 days before infection. Thus, rIL-2 acted therapeutically or prophylactically in the presence or absence, respectively, of a specific antigen. These effects were not abolished by anti-asialo GM1 antibody. This suggests that activation of natural killer cells does not play a critical role in the therapeutic and prophylactic effects of rIL-2.

Effect of recombinant human interleukin-2 on the course of experimental chronic respiratory tract infection caused by Klebsiella pneumoniae in mice