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Effect of M20 interleukin-1 inhibitor on normal and leukemic human myeloid progenitors

T Peled, M Rigel, D Peritt, E Fibach, AJ Treves and V Barak

Department of Hematology, Hadassah University Hospital, Jerusalem, Israel.

This study aimed to assess the effect of the M20 interleukin-1 (IL-1) inhibitor on normal and leukemic hematopoietic cells. The M20-derived IL-1 inhibitor was found to inhibit the growth of various hematopoietic cells. The in vitro proliferation of myeloid cell lines in serum- containing medium or proliferation of these cells induced by IL-1 in serum-free medium (measured by 3H-TdR) were inhibited by the M20 IL-1 inhibitor. In addition, growth of normal progenitors and fresh leukemic cells stimulated by granulocyte-macrophage colony-stimulating factor (GM-CSF) (as measured by colony and liquid systems) was also inhibited by this factor. After the removal of the IL-1 inhibitor at the peak of growth inhibition, leukemic and normal progenitor cells retain their ability to grow and develop into GM-CSF colonies. These results show that the growth inhibition phenomena were reversible and did not result from a cytotoxic effect. Our data suggest that the M20-derived IL-1 inhibitor might function as a true negative growth regulator of normal and leukemic hematopoietic cells.

Volume 79, Issue 5, pp. 1172-1177, 03/01/1992
Copyright © 1992 by The American Society of Hematology


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