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- W1999804975 abstract "Abstract Gastric B-cell lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma) develops in the chronically inflamed mucosa of patients infected with the bacterial pathogen Helicobacter pylori. Here we use patient material, primary gastric lymphoma cell cultures, and a preclinical model of the disease to examine the role of microRNA (miRNA)-mediated posttranscriptional regulation—focusing in particular on miR-203 and its target ABL1—in gastric MALT lymphomagenesis. Microarray-based miRNA expression profiling revealed a strong downregulation of the putative tumor suppressor miRNA miR-203 in human MALT lymphoma samples, which resulted from extensive promoter hypermethylation of the miR-203 locus and coincided with the dysregulation of the miR-203 target ABL1 in lymphoma biopsies compared with matched adjacent normal material from the same patients. Treatment of lymphoma B cells with demethylating agents led to increased miR-203 expression and the concomitant downregulation of ABL1, confirming the epigenetic regulation of this miRNA. Ectopic reexpression of miR-203 by transfection of a human lymphoma cell line or lentiviral transduction of explanted primary MALT lymphoma cells was sufficient to prevent tumor cell proliferation in vitro. Similarly, the treatment of primary MALT lymphoma cells with the ABL inhibitors imatinib and dasatinib prevented tumor cell growth. Finally, we show that the treatment of tumor-bearing mice with imatinib induces MALT lymphoma regression in a preclinical model of the disease, implicating ABL1 in MALT lymphoma progression. In summary, our results show that the transformation from gastritis to MALT lymphoma is epigenetically regulated by miR-203 promoter methylation and identify ABL1 as a novel target for the treatment of this malignancy. Cancer Res; 71(10); 3616–24. ©2011 AACR." @default.
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- W1999804975 date "2011-05-15" @default.
- W1999804975 modified "2023-10-16" @default.
- W1999804975 title "Epigenetic Silencing of MicroRNA-203 Dysregulates ABL1 Expression and Drives <i>Helicobacter</i>-Associated Gastric Lymphomagenesis" @default.
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- W1999804975 doi "https://doi.org/10.1158/0008-5472.can-10-3907" @default.
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