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- W2032078881 abstract "Mice that accurately model the genetic diversity found in human cancer are valuable tools for interrogating disease mechanisms and investigating novel therapeutic strategies. We performed insertional mutagenesis with the MOL4070LTR retrovirus in Mx1-Cre, Kras G12D mice and generated a large cohort of T lineage acute lymphoblastic leukemias (T-ALLs). Molecular analysis infers that retroviral integration within Ikzf1 is an early event in leukemogenesis that precedes Kras G12D expression and later acquisition of somatic Notch1 mutations. Importantly, biochemical analysis uncovered unexpected heterogeneity, which suggests that Ras signaling networks are remodeled during multistep tumorigenesis. We tested tumor-derived cell lines to identify biomarkers of therapeutic response to targeted inhibitors. Whereas all T-ALLs tested were sensitive to a dual-specificity phosphoinosityl 3-kinase/mammalian target of rapamycin inhibitor, biochemical evidence of Notch1 activation correlated with sensitivity to γ-secretase inhibition. In addition, Kras G12D T-ALLs were more responsive to a MAP/ERK kinase inhibitor in vitro and in vivo. Together, these studies identify a genetic pathway involving Ikzf1, Kras G12D , and Notch1 in T lineage leukemogenesis, reveal unexpected diversity in Ras-regulated signaling networks, and define biomarkers of drug responses that may inform treatment strategies." @default.
- W2032078881 created "2016-06-24" @default.
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- W2032078881 date "2010-03-01" @default.
- W2032078881 modified "2023-09-23" @default.
- W2032078881 title "Mutant <i> Ikzf1, Kras <sup>G12D</sup> </i> , and <i>Notch1</i> cooperate in T lineage leukemogenesis and modulate responses to targeted agents" @default.
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- W2032078881 doi "https://doi.org/10.1073/pnas.1001064107" @default.
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