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The effect of recombinant human interleukin-1 alpha (IL-1) on the resistance of normal and bone marrow-suppressed mice against bacterial infection was evaluated. IL-1 induced neutrophilia and enhanced the resistance of normal mice against acute, systemic intraperitoneal infection with Klebsiella pneumoniae and methicillin-resistant Staphylococcus aureus. Mice with cyclophosphamide-induced bone marrow suppression were neutropenic and exhibited increased susceptibility to infection. Treatment of neutropenic C57BL/6 and C3H/HeJ mice with IL-1 before infection accelerated recovery of peripheral neutrophil counts and stimulated resistance against infection. Increases in neutrophils and enhancement of resistance induced by IL-1 were both dose and time dependent. Both neutrophilia and augmented resistance to infection were eliminated by a second dose of cyclophosphamide administered during the IL-1 treatments. Bone marrow-suppressed mice treated with IL-1 showed, at 4 h postinfection, greater increases in peripheral blood neutrophils and in numbers of peritoneal exudate neutrophils than suppressed mice treated with vehicle. The data suggest that the IL-1-stimulated recovery of myelopoiesis is an important factor in the enhancement of antibacterial resistance in bone marrow-suppressed, neutropenic mice. These findings indicate that IL-1 may be efficacious in limiting the duration of the neutropenia and of the increased risk for the development of bacterial infection associated with bone marrow suppression.

Enhancement of antibacterial resistance of neutropenic, bone marrow-suppressed mice by interleukin-1 alpha