title: Effects of transforming growth factor beta 1 on growth and apoptosis of human acute myelogenous leukemia cells.
abstract: Because limited studies examined effects of transforming growth factor (TGF) beta 1 on growth of human acute myelogenous leukemia (AML) cells, we used factor-dependent and primary AML cells to assess TGF-beta 1 effects on human AML cell growth. OCI-AML1 cells were growth inhibited by TGF-beta 1 regardless of which growth factor was used as a stimulus. In contrast, AML-193 cells were resistant to TGF-beta 1 when grown with or without growth factors. UCSD/AML1 cells were sensitive to TGF-beta 1 inhibition when grown with most cytokines but were relatively resistant to TGF-beta 1 in the presence of macrophage colony-stimulating factor (M-CSF). Although cells grown from 5 of 6 AML patients were inhibited by TGF-beta 1, cells from 1 AML patient were growth stimulated by TGF-beta 1 in the presence of granulocyte-macrophage colony-stimulating factor (GM-CSF), M-CSF, or mast cell growth factor (kit ligand). Thus, 3 growth patterns with TGF-beta 1 were observed: (a) sensitivity to growth inhibition; (b) resistance; and (c) factor-dependent resistance. Further studies showed that AML-193 and UCSD/AML1 cells expressed type II TGF-beta 1 receptors and that ability of TGF-beta 1 to decrease GM-CSF receptors did not correlate with growth inhibition. AML-193 cells and UCSD/AML1 cells grown with M-CSF could be propagated in 1 ng/ml TGF-beta 1, but UCSD/AML1 cells grown with GM-CSF and TGF-beta 1 died. Morphology and agarose gel analysis of DNA showed UCSD/AML1 cells underwent apoptosis when grown with GM-CSF and TGF-beta 1 but not with M-CSF and TGF-beta 1. Similar studies of OCI-AML1 cells showed that TGF-beta 1 induced apoptosis of cells grown in 5637 bladder cell-conditioned medium or GM-CSF. These studies indicate that human AML cells exhibit heterogeneous growth responses to TGF-beta 1 and that some effects of TGF-beta 1 on myeloid cells occur through programmed cell death.
authors.affiliation: Department of Medicine, Arizona Health Sciences Center, University of Arizona, Tucson 85724.
authors.forename: R
authors.initials: R
authors.lastname: Taetle
authors.forename: C
authors.initials: C
authors.lastname: Payne
authors.forename: B
authors.initials: B
authors.lastname: Dos Santos
authors.forename: M
authors.initials: M
authors.lastname: Russell
authors.forename: P
authors.initials: P
authors.lastname: Segarini
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D002455:Cell Division / Q000187:drug effects; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D006801:Humans; D007377:Interleukin-3 / Q000494:pharmacology; D015470:Leukemia, Myeloid, Acute / Q000473:pathology*; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D014407:Tumor Cells, Cultured; D014410:Tumor Stem Cell Assay
chemical_list: D007377:Interleukin-3; D016212:Transforming Growth Factor beta; D016178:Granulocyte-Macrophage Colony-Stimulating Factor