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GAROFALO, M; QUINTAVALLE, C; DI LEVA, G; ZANCA, C; ROMANO, G; TACCIOLI, C; LIU, C. G; CROCE, C. M; CONDORELLI, G
Oncogene, 06/2008, Letnik: 27, Številka: 27Journal Article
To define novel pathways that regulate susceptibility to tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) in non-small cell lung cancer (NSCLC), we have performed genome-wide expression profiling of microRNAs (miRs). We show that in TRAIL-resistant NSCLC cells, levels of different miRs are increased, and in particular, miR-221 and -222. We demonstrate that these miRs impair TRAIL-dependent apoptosis by inhibiting the expression of key functional proteins. Indeed, transfection with anti-miR-221 and -222 rendered CALU-1-resistant cells sensitive to TRAIL. Conversely, H460-sensitive cells treated with -221 and -222 pre-miRs become resistant to TRAIL. miR-221 and -222 target the 3'-UTR of Kit and p27(kip1) mRNAs, but interfere with TRAIL signaling mainly through p27(kip1). In conclusion, we show that high expression levels of miR-221 and -222 are needed to maintain the TRAIL-resistant phenotype, thus making these miRs as promising therapeutic targets or diagnostic tool for TRAIL resistance in NSCLC.
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in: SICRIS
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