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Interleukin-1 accelerates murine granulocyte recovery following treatment with cyclophosphamide

L Stork, L Barczuk, M Kissinger and W Robinson

Department of Pediatrics, University of Colorado Health Sciences Center, Denver.

This study investigated the effects of recombinant human interleukin-1 (rhIL-1 alpha) on granulocyte recovery following treatment of mice with cyclophosphamide (CPM). CF1 mice were injected with 0.5 microgram rhIL- 1 alpha or heat-inactivated rhIL-1 alpha according to five different regimens, before and/or following 200 mg/kg CPM. Significant neutrophilia initially developed in treatment mice of all five regimens and accelerated granulocyte recovery occurred in treatment mice of four IL-1 regimens. Significant elevations in serum colony stimulating activity (CSA) occurred in treatment mice at a number of time points studied. In addition, marked increases in the percentage of maturing granulocyte precursors and in the proportion of cells cycling in S and G2/M were observed in treatment marrow throughout the IL-1 regimen. Before granulocyte recovery, premature nuclear segmentation was noted in metamyelocytes of treatment marrow. Concomitant with granulocyte recovery, treatment marrow was significantly more cellular and contained more total CFU-GM, more CFU-GM in S phase, more cells in S and G2/M, and more mitotic figures than control marrow. Splenic myelopoiesis was also enhanced in treatment mice. These data suggest that IL-1 significantly hastens granulocyte recovery following treatment with CPM by enhancing both proliferation and maturation of myeloid precursors.

Volume 73, Issue 4, pp. 938-944, 03/01/1989
Copyright © 1989 by The American Society of Hematology


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