Increased circulating colony-stimulating factor-1 (CSF-1) in SJL/J mice with radiation-induced acute myeloid leukemia (AML) is associated with autocrine regulation of AML cells by CSF-1.
The SJL/J mouse strain has a high spontaneous incidence of a B-cell neoplasm, reticulum cell neoplasm type B (RCN B). In addition, following irradiation, 10% to 30% of these mice develop acute myelomonocytic leukemia (radiation-induced acute myeloid leukemia [RI-AML]), an incidence that can be increased to 50% by treatment of the mice with corticosteroids after irradiation. The role played by the mononuclear phagocyte growth factor, colony-stimulating factor-1 (CSF-1), in the development of RI-AML in SJL/J mice was investigated. Mice dying of RI-AML, but not those dying of RCN B or without disease, possessed elevated concentrations of circulating CSF-1. In addition, in mice developing RI-AML with a more prolonged latency, circulating CSF-1 concentrations were increased before overt expression of RI-AML. First-passage tumors from 14 different RI-AMLs all contained high concentrations of CSF-1, and six of six different first- or second-passage tumors expressed the CSF-1 receptor (CSF-1 R). Furthermore, in vitro colony formation by first- or second-passage tumor cells from 20 of 20 different RI-AMLs was blocked by neutralizing anti-CSF-1 antibody, and four of four of these tumors were inhibited by anti-CSF-1R antibody. The results of these antibody neutralization studies, coupled with the observation of elevated circulating CSF-1 in mice developing RI-AML, show an autocrine role for CSF-1 in RI-AML development in SJL/J mice. Southern blot analysis of tumor DNA from six of six of these tumors failed to reveal any rearrangements in the genes for CSF-1 or the CSF-1R. Studies in humans have shown that patients with AML possess elevated levels of circulating CSF-1 and that AML cells can express CSF-1 and the CSF-1R. Thus, RI-AML in the SJL/J mouse appears to be a useful model for human AML.
Haran-Ghera
N
N
Department of Immunology, The Weizmann Institute of Science, Rehovot, Israel.
Krautghamer
R
R
Lapidot
T
T
Peled
A
A
Dominguez
M G
MG
Stanley
E R
ER
D000208:Acute Disease; D000818:Animals; D002455:Cell Division; D003907:Dexamethasone / Q000633:toxicity; D004195:Disease Models, Animal; D004198:Disease Susceptibility; D005260:Female; D006801:Humans; D007951:Leukemia, Myeloid / Q000097:blood* / Q000209:etiology; D007953:Leukemia, Radiation-Induced / Q000097:blood*; D016403:Lymphoma, Large B-Cell, Diffuse / Q000097:blood / Q000235:genetics; D016173:Macrophage Colony-Stimulating Factor / Q000097:blood* / Q000378:metabolism; D051379:Mice; D008815:Mice, Inbred Strains; D009363:Neoplasm Proteins / Q000097:blood* / Q000378:metabolism; D014411:Neoplastic Stem Cells / Q000378:metabolism* / Q000473:pathology; D014407:Tumor Cells, Cultured; D014916:Whole-Body Irradiation / Q000009:adverse effects
D009363:Neoplasm Proteins; D003907:Dexamethasone; D016173:Macrophage Colony-Stimulating Factor