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Distinct pathways affected by menin versus MLL1/MLL2 in MLL-rearranged acute myeloid leukemia.

Exp. Hematol.2019 Jan;69:37-42. Epub 2018 Oct 10
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摘要


Disrupting the protein-protein interaction for molecularly targeted cancer therapeutics can be a challenging but promising strategy. Compounds that disrupt the interaction between menin, a chromatin-binding protein, and oncogenic mixed lineage leukemia fusion proteins (MLL-FPs) have shown significant promise in preclinical models of leukemia and have a high degree of selectivity for leukemia versus normal hematopoietic cells. Biochemical and structural studies demonstrate that, in addition to disrupting the menin-MLL-FP interaction, such compounds also inhibit menin-MLL1, menin-MLL2, and other menin-interacting proteins. Here, we address the degree to which disruption of menin-MLL-FP interactions or menin-MLL1/MLL2 interactions contribute to the antileukemia effect of menin inhibition. We show that Men1 deletion in MLL-AF9-transformed leukemia cells produces distinct cellular and molecular consequences compared with Mll1;Mll2 co-deletion and that compounds disrupting menin-MLL N-terminal interactions largely phenocopy menin loss. Moreover, we show that Mll1;Mll2-deficient leukemia cells exhibit enhanced sensitivity to menin interaction inhibitors, which is consistent with each regulating complementary genetic pathways. These data illustrate the heightened dependency of MLL-FPs on menin compared with wild-type MLL1/MLL2 for regulation of downstream target genes and argue that the predominant action of menin inhibitory compounds is through direct inhibition of MLL-FPs without significant contribution from MLL1/MLL2 inhibition.

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