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Bicocca, Vincent T.; Chang, Bill H.; Masouleh, Behzad Kharabi; Muschen, Markus; Loriaux, Marc M.; Druker, Brian J.; Tyner, Jeffrey W.
Cancer cell, 11/2012, Letnik: 22, Številka: 5Journal Article
We report that t(1;19) ALL cells universally exhibit expression of and dependence on the cell surface receptor ROR1. We further identify t(1;19) ALL cell sensitivity to the kinase inhibitor dasatinib due to its inhibition of the pre-B cell receptor (pre-BCR) signaling complex. These phenotypes are a consequence of developmental arrest at an intermediate/late stage of B-lineage maturation. Additionally, inhibition of pre-BCR signaling induces further ROR1 upregulation, and we identify distinct ROR1 and pre-BCR downstream signaling pathways that are modulated in a counterbalancing manner—both leading to AKT phosphorylation. Consistent with this, AKT phosphorylation is transiently eliminated after dasatinib treatment, but is partially restored following dasatinib potentiation of ROR1 expression. Consequently, ROR1 silencing accentuates dasatinib killing of t(1;19) ALL cells. ► ROR1 and the pre-BCR are therapeutic targets for t(1;19)-ALL cells ► t(1;19)-ALL cells are universally sensitive to dasatinib because of pre-BCR inhibition ► ROR1 and the pre-BCR drive cooperative signaling cascades ► Silencing of ROR1 accentuates dasatinib killing of t(1;19)-ALL cells
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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