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IL-17A is a T cell-derived proinflammatory cytokine required for microbial host defense. In vivo expression profoundly stimulates granulopoiesis. At baseline, the hemopoietic system of IL-17R knockout mice (IL-17Ra(-/-)) is, with the exception of increased splenic progenitor numbers, indistinguishable from normal control mice. However, when challenged with gamma irradiation, hemopoietic toxicity is significantly more pronounced in IL-17Ra(-/-) animals, with the gamma irradiation-associated LD(50) being reduced by 150 rad. In spleen-derived T cells, gamma irradiation induces significant murine IL-17A expression in vivo but not in vitro. After sublethal radiation injury (500 rad), the infusion of purified CD4(+) T cells enhances hemopoietic recovery. This recovery is significantly impaired in IL-17Ra(-/-) animals or after in vivo blockade of IL-17Ra in normal mice, resulting in a reduction of hemopoietic precursors by 50% and of neutrophils by 43%. Following sublethal radiation-induced myelosuppression, in vivo overexpression of murine IL-17A in normal mice substantially enhanced granulopoietic restoration in mice with a 4-fold increase in neutrophils and splenic precursors on day 8 (CFU-granulocyte-macrophage/granulocyte-erythrocyte-megakaryocyte-monocyte, CFU-high proliferative potential), as well as 2- and 3-fold increases of bone marrow precursors, respectively. This establishes IL-17A as a hemopoietic response cytokine to radiation injury in mice and an inducible mechanism that is required for recovery of granulopoiesis after radiation injury.

IL-17 Receptor Knockout Mice Have Enhanced Myelotoxicity and Impaired Hemopoietic Recovery Following Gamma Irradiation