Abstract
The transcription factor STAT5 has a critical role in B cell acute lymphoblastic leukemia (B-ALL). How STAT5 mediates this effect is unclear. Here we found that activation of STAT5 worked together with defects in signaling components of the precursor to the B cell antigen receptor (pre-BCR), including defects in BLNK, BTK, PKCβ, NF-κB1 and IKAROS, to initiate B-ALL. STAT5 antagonized the transcription factors NF-κB and IKAROS by opposing regulation of shared target genes. Super-enhancers showed enrichment for STAT5 binding and were associated with an opposing network of transcription factors, including PAX5, EBF1, PU.1, IRF4 and IKAROS. Patients with a high ratio of active STAT5 to NF-κB or IKAROS had more-aggressive disease. Our studies indicate that an imbalance of two opposing transcriptional programs drives B-ALL and suggest that restoring the balance of these pathways might inhibit B-ALL.
MeSH terms
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Adaptor Proteins, Signal Transducing / genetics*
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Agammaglobulinaemia Tyrosine Kinase
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Animals
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B-Lymphocytes*
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Chromatin Immunoprecipitation
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Flow Cytometry
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Gene Expression Regulation, Neoplastic*
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Humans
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Ikaros Transcription Factor / genetics*
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Interferon Regulatory Factors / genetics
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Mice
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Multiplex Polymerase Chain Reaction
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NF-kappa B p50 Subunit / genetics
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PAX5 Transcription Factor / genetics
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Pre-B Cell Receptors / genetics*
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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 / mortality
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Prognosis
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Protein Kinase C beta / genetics
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Protein-Tyrosine Kinases / genetics
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Proto-Oncogene Proteins / genetics
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Real-Time Polymerase Chain Reaction
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STAT5 Transcription Factor / metabolism*
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Signal Transduction
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Survival Rate
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Trans-Activators / genetics
Substances
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Adaptor Proteins, Signal Transducing
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B cell linker protein
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Ebf1 protein, mouse
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IKZF1 protein, human
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Interferon Regulatory Factors
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NF-kappa B p50 Subunit
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PAX5 Transcription Factor
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Pax5 protein, mouse
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Pre-B Cell Receptors
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Proto-Oncogene Proteins
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STAT5 Transcription Factor
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Trans-Activators
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Zfpn1a1 protein, mouse
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interferon regulatory factor-4
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proto-oncogene protein Spi-1
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Nfkb1 protein, mouse
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Ikaros Transcription Factor
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Protein-Tyrosine Kinases
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Agammaglobulinaemia Tyrosine Kinase
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BTK protein, human
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Prkcb protein, mouse
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Protein Kinase C beta