Abstract
Matrix metalloproteinases have been reported to be involved in tumor cell invasion and metastasis. Dissemination of malignant cells in acute myeloid leukemia (AML) may be mediated by similar mechanisms. Here, we report, that the t(15/17)+ acute promyelocytic leukemia (APL) cell line NB4 constitutively expresses and releases the proenzyme form of matrix metalloproteinase-9 (MMP-9, 92 kDa type IV collagenase/gelatinase, gelatinase B), as well as tissue inhibitor of metalloproteinases-1 (TIMP-1). Both proteins were identified by N-terminal amino acid sequence analysis after purification using gelatin Sepharose affinity chromatography. Whereas 12-O-tetradecanoylphorbol-13 acetate (TPA) increased both MMP-9 and TIMP-1 mRNA levels, tumor necrosis factor-α (TNF-α) stimulated only MMP-9 gene expression in a dose- and time-dependent manner. Neutralizing monoclonal antibodies (MoABs) to TNF-α (anti-TNF-α) decreased the constitutive and TPA-dependent expression of MMP-9 but did not influence TIMP-1 expression, either in unstimulated or in TPA-treated NB4 cells. FACS analyses showed that NB4 cells express both TNF receptor 1 (TNF-R1) and TNF-R2 to a similar extent. Blocking MoABs against TNF-R 1 (anti-TNF-R1) decreased the constitutive expression of MMP-9, whereas anti-TNF-R2 had almost no effect. Our results show, that in NB4 cells the expression of MMP-9 but not of TIMP-1 is maintained by autocrine stimulation with TNF-α. Thus, leukemic cells may be enabled to leave the bone marrow and infiltrate peripheral tissues by a dysfunction in the regulation of the MMP-9:TIMP-1 equilibrium, possibly triggered through autostimulation by TNF-α.
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Ismair, M., Ries, C., Lottspeich, F. et al. Autocrine regulation of matrix metalloproteinase-9 gene expression and secretion by tumor necrosis factor-α (TNF-α) in NB4 leukemic cells: specific involvement of TNF receptor type 1. Leukemia 12, 1136–1143 (1998). https://doi.org/10.1038/sj.leu.2401042
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DOI: https://doi.org/10.1038/sj.leu.2401042
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