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- W2034630122 abstract "Recent experimental data suggest that one of the major effects of BCR-ABL gene expression in hematopoietic cells is the inhibition of apoptosis. Although the exact mechanisms of this phenomenon are not clear, it is thought to be related to the fact that BCR-ABL induces several signalling pathways also activated by growth factors. In order to determine the anti-apoptotic role of BCR-ABL in a hematopoietic cell line and to by-pass the influence of cytokine-dependence, BCR-ABL gene was expressed in the autonomously growing myelomonocytic U937 cell line using retroviral vectors. There was no resistance to apoptosis induced by either serum deprivation or different doses of etoposide in any U937 clones expressing BCR-ABL protein. In addition to serum deprivation and etoposide, BCR-ABL-expressing clones were not protected from apoptosis induced by TNF, ceramide-C2 and FAS-cross-linking. BCL2 expression was absent in U937 cells and BAX levels were identical between Neo and BCR-ABL clones. To further investigate the mechanisms of this phenomenon, band-shift assays were performed to detect activation of STAT molecules. No constitutive activation of STATs was detected in either NeoR or BCR-ABL-U937 cells, although both ERN-γ and GM-CSF activated STAT1 and STAT5, respectively, with similar kinetics in both NeoR and BCR-ABL-U937 cells. In addition, the GM-CSF-induced-STAT5 activation was found to be weakened in all clones expressing BCR-ABL. In both control NeoR and BCR-ABL-transfected clones, band-shin assays revealed the presence of an abnormal truncated STAT5 recognized only by an anti-N-terminal but not by an anti-C-Terminal STAT5 antibody. These findings suggest a possible link between the absence of anti-apoptotic potential of BCR-ABL and abnormalities of the STAT5 pathway, including, absence of constitutive activation of STAT5, inhibition of GM-CSF-induced STAT5 activation and expression of a carboxyl-terminal-truncated STAT5." @default.
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- W2034630122 date "2001-01-01" @default.
- W2034630122 modified "2023-09-29" @default.
- W2034630122 title "BCR-ABL Fails to Inhibit Apoptosis in U937 Myelomonocytic Cells Expressing a Carboxyl-Terminal Truncated Stat5" @default.
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- W2034630122 doi "https://doi.org/10.3109/10428190109064601" @default.
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