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• W2004246503 abstract "Abstract The gene(s) responsible for natural killer (NK)–cell lymphoma/leukemia have not been identified. In the present study, we found that in NK-cell lymphoma lines (n = 10) and specimens of primary lymphoma (n = 10), levels of miR-21 and miR-155 expression were inversely related and were significantly greater than those found in normal natural killer (CD3−CD56+) cells (n = 8). To determine the functions of these microRNAs in lymphomagenesis, we examined the effects of antisense oligonucleotides (ASOs) targeting miR-21 (ASO-21) and/or miR-155 (ASO-155) in NK-cell lymphoma lines overexpressing one or both of these miRNAs. Conversely, cells showing little endogenous expression of miR-21 or miR-155 were transduced by the use of lentiviral vectors, leading to their overexpression. Reducing expression of miR-21 or miR-155 led to up-regulation of phosphatase and tensin homologue (PTEN), programmed cell death 4 (PDCD4), or Src homology-2 domain-containing inositol 5-phosphatase 1 (SHIP1). ASO-21– and ASO-155–treated cell lines all showed down-regulation of phosphorylated AKTser473. Moreover, transduction with either miR-21 or miR-155 led to down-regulation of PTEN and PDCD4 or SHIP1 with up-regulation of phosphorylated AKTser473. Collectively, these results provide important new insight into the pathogenesis of NK-cell lymphoma/leukemia and suggest targeting miR-21 and/or miR-155 may represent a useful approach to treating NK-cell lymphoma/leukemia." @default.
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• W2004246503 date "2009-10-08" @default.
• W2004246503 modified "2023-09-30" @default.
• W2004246503 title "Aberrant overexpression of microRNAs activate AKT signaling via down-regulation of tumor suppressors in natural killer–cell lymphoma/leukemia" @default.
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• W2004246503 doi "https://doi.org/10.1182/blood-2009-06-222794" @default.
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