Antagonism of B cell enhancer networks by STAT5 drives leukemia and poor patient survival

Nat Immunol. 2017 Jun;18(6):694-704. doi: 10.1038/ni.3716. Epub 2017 Apr 3.

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

  • Adaptor Proteins, Signal Transducing / genetics*
  • Agammaglobulinaemia Tyrosine Kinase
  • Animals
  • B-Lymphocytes*
  • Chromatin Immunoprecipitation
  • Flow Cytometry
  • Gene Expression Regulation, Neoplastic*
  • Humans
  • Ikaros Transcription Factor / genetics*
  • Interferon Regulatory Factors / genetics
  • Mice
  • Multiplex Polymerase Chain Reaction
  • NF-kappa B p50 Subunit / genetics
  • PAX5 Transcription Factor / genetics
  • Pre-B Cell Receptors / genetics*
  • Precursor Cell Lymphoblastic Leukemia-Lymphoma / genetics*
  • Precursor Cell Lymphoblastic Leukemia-Lymphoma / metabolism
  • Precursor Cell Lymphoblastic Leukemia-Lymphoma / mortality
  • Prognosis
  • Protein Kinase C beta / genetics
  • Protein-Tyrosine Kinases / genetics
  • Proto-Oncogene Proteins / genetics
  • Real-Time Polymerase Chain Reaction
  • STAT5 Transcription Factor / metabolism*
  • Signal Transduction
  • Survival Rate
  • Trans-Activators / genetics

Substances

  • Adaptor Proteins, Signal Transducing
  • B cell linker protein
  • Ebf1 protein, mouse
  • IKZF1 protein, human
  • Interferon Regulatory Factors
  • NF-kappa B p50 Subunit
  • PAX5 Transcription Factor
  • Pax5 protein, mouse
  • Pre-B Cell Receptors
  • Proto-Oncogene Proteins
  • STAT5 Transcription Factor
  • Trans-Activators
  • Zfpn1a1 protein, mouse
  • interferon regulatory factor-4
  • proto-oncogene protein Spi-1
  • Nfkb1 protein, mouse
  • Ikaros Transcription Factor
  • Protein-Tyrosine Kinases
  • Agammaglobulinaemia Tyrosine Kinase
  • BTK protein, human
  • Prkcb protein, mouse
  • Protein Kinase C beta