Abstract

The beneficial effects of IL-1 and other cytokines on hematopoiesis and on resistance to infection are profound. IL-1 stimulates proliferation of bone marrow cells in normal mice and potentiates the recovery of peripheral blood neutrophils in mice with drug-induced neutropenia. Prophylactic cytokine administration provides an elevated level of natural resistance to infections which is correlated with increased numbers of phagocytic leukocytes. These studies suggest that IL-1 has potential clinical application as a therapy to limit bone marrow dysfunction and immunosuppression and to augment hematopoiesis and natural immunity. Further research will continue to elucidate the mechanisms whereby interleukins and colony-stimulating factors act, and interact, to promote restoration of leukocyte production and to enhance host resistance.

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