Abstract
Studying 830 pre-B ALL cases from four clinical trials, we found that human ALL can be divided into two fundamentally distinct subtypes based on pre-BCR function. While absent in the majority of ALL cases, tonic pre-BCR signaling was found in 112 cases (13.5%). In these cases, tonic pre-BCR signaling induced activation of BCL6, which in turn increased pre-BCR signaling output at the transcriptional level. Interestingly, inhibition of pre-BCR-related tyrosine kinases reduced constitutive BCL6 expression and selectively killed patient-derived pre-BCR(+) ALL cells. These findings identify a genetically and phenotypically distinct subset of human ALL that critically depends on tonic pre-BCR signaling. In vivo treatment studies suggested that pre-BCR tyrosine kinase inhibitors are useful for the treatment of patients with pre-BCR(+) ALL.
Copyright © 2015 Elsevier Inc. All rights reserved.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Basic Helix-Loop-Helix Transcription Factors / metabolism
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Basic Helix-Loop-Helix Transcription Factors / physiology
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Clinical Trials as Topic
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DNA-Binding Proteins / genetics
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DNA-Binding Proteins / metabolism
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DNA-Binding Proteins / physiology*
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Gene Expression Regulation, Neoplastic*
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Humans
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Intracellular Signaling Peptides and Proteins / metabolism
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Molecular Sequence Data
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Phosphatidylinositol 3-Kinase / metabolism
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Pre-B-Cell Leukemia Transcription Factor 1
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Precursor Cell Lymphoblastic Leukemia-Lymphoma / genetics
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Precursor Cell Lymphoblastic Leukemia-Lymphoma / metabolism*
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Precursor Cell Lymphoblastic Leukemia-Lymphoma / pathology
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Precursor Cells, B-Lymphoid / metabolism*
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Protein-Tyrosine Kinases / metabolism
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Proto-Oncogene Proteins / metabolism
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Proto-Oncogene Proteins / physiology
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Proto-Oncogene Proteins c-bcl-6
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Signal Transduction
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Syk Kinase
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Up-Regulation
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src-Family Kinases / metabolism
Substances
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BCL6 protein, human
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Basic Helix-Loop-Helix Transcription Factors
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DNA-Binding Proteins
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Intracellular Signaling Peptides and Proteins
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Pre-B-Cell Leukemia Transcription Factor 1
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Proto-Oncogene Proteins
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Proto-Oncogene Proteins c-bcl-6
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TCF3 protein, human
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PBX1 protein, human
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Phosphatidylinositol 3-Kinase
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Protein-Tyrosine Kinases
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SYK protein, human
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Syk Kinase
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src-Family Kinases
Associated data
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GEO/GSE59332
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GEO/GSE59538