title: Effect of M20 interleukin-1 inhibitor on normal and leukemic human myeloid progenitors.
abstract: 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.
authors.affiliation: Department of Hematology, Hadassah University Hospital, Jerusalem, Israel.
authors.forename: T
authors.initials: T
authors.lastname: Peled
authors.forename: M
authors.initials: M
authors.lastname: Rigel
authors.forename: D
authors.initials: D
authors.lastname: Peritt
authors.forename: E
authors.initials: E
authors.lastname: Fibach
authors.forename: A J
authors.initials: AJ
authors.lastname: Treves
authors.forename: V
authors.initials: V
authors.lastname: Barak
mesh_terms: D002455:Cell Division / Q000187:drug effects; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D006098:Granulocytes / Q000187:drug effects* / Q000473:pathology; D006412:Hematopoietic Stem Cells / Q000187:drug effects* / Q000473:pathology; D006801:Humans; D007375:Interleukin-1 / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D015850:Interleukin-6 / Q000494:pharmacology; D007938:Leukemia / Q000473:pathology*; D014407:Tumor Cells, Cultured
chemical_list: D007375:Interleukin-1; D015850:Interleukin-6; D016178:Granulocyte-Macrophage Colony-Stimulating Factor