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- W2074657524 abstract "We have investigated the expression of the IAPs (inhibitory of apoptosis proteins) in the human HL-60 leukemia and in its multidrug resistant, P-glycoprotein (P-gp) over-expressing variant, HL-60R. HL-60R exhibits resistance to apoptosis induced from P-gp substrate drugs and also from other triggers (cisplatin, TNF-alpha, Fas ligation, TRAIL, IFN-gamma and serum starvation) not related to the multidrug transporter. Except for c-IAP-1 mRNA, HL-60R significantly over-expressed both the mRNAs and the proteins of all the IAPs studied, i.e. c-IAP-1, c-IAP-2, XIAP, NAIP and survivin. Determination of the DNA-binding capacity of NF-kappaB (p50 or p65 subunits) indicated that, while HL-60 cells show constitutive activation of p50 only, HL-60R cells contain the activated forms of both p50 and p65. Since p65 is necessary to form the NF-kappaB heterodimers able to increase transcription, its presence in HL-60R cells might well correlate to their increased levels of IAPs and, possibly of P-gp, which, reportedly, are NF-kappaB target genes. These results underline the possible role that the coordinated over-expression of the different IAPs may play in tumor cell resistance to drug induced apoptosis. Inhibition of NF-kappaB might be a useful strategy to block their up-regulation." @default.
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- W2074657524 date "2004-01-01" @default.
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- W2074657524 title "Expression of the IAPs in multidrug resistant tumor cells" @default.
- W2074657524 doi "https://doi.org/10.3892/or.11.1.133" @default.
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