Synthetic Lethality of Wnt Pathway Activation and Asparaginase in Drug-Resistant Acute Leukemias

Cancer Cell. 2019 Apr 15;35(4):664-676.e7. doi: 10.1016/j.ccell.2019.03.004.

Abstract

Resistance to asparaginase, an antileukemic enzyme that depletes asparagine, is a common clinical problem. Using a genome-wide CRISPR/Cas9 screen, we found a synthetic lethal interaction between Wnt pathway activation and asparaginase in acute leukemias resistant to this enzyme. Wnt pathway activation induced asparaginase sensitivity in distinct treatment-resistant subtypes of acute leukemia, but not in normal hematopoietic progenitors. Sensitization to asparaginase was mediated by Wnt-dependent stabilization of proteins (Wnt/STOP), which inhibits glycogen synthase kinase 3 (GSK3)-dependent protein ubiquitination and proteasomal degradation, a catabolic source of asparagine. Inhibiting the alpha isoform of GSK3 phenocopied this effect, and pharmacologic GSK3α inhibition profoundly sensitized drug-resistant leukemias to asparaginase. Our findings provide a molecular rationale for activation of Wnt/STOP signaling to improve the therapeutic index of asparaginase.

Keywords: FBXW7; GSK3; Wnt signaling; acute leukemia; asparaginase; asparagine; drug resistance; proteasomal degradation; protein ubiquitination; synthetic lethality.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antineoplastic Agents / pharmacology*
  • Asparaginase / pharmacology*
  • Cell Death / drug effects
  • Dose-Response Relationship, Drug
  • Drug Resistance, Neoplasm*
  • Glycogen Synthase Kinase 3 beta / antagonists & inhibitors
  • Glycogen Synthase Kinase 3 beta / metabolism
  • Humans
  • Jurkat Cells
  • Leukemia / drug therapy*
  • Leukemia / genetics
  • Leukemia / metabolism
  • Leukemia / pathology
  • Male
  • Mice, Inbred NOD
  • Mice, Transgenic
  • Polyethylene Glycols / pharmacology*
  • Proteasome Endopeptidase Complex / metabolism
  • Protein Kinase Inhibitors / pharmacology
  • Protein Stability
  • Proteolysis
  • Synthetic Lethal Mutations*
  • THP-1 Cells
  • Ubiquitination
  • Wnt Signaling Pathway / genetics*
  • Wnt3A Protein / genetics*
  • Wnt3A Protein / metabolism
  • Xenograft Model Antitumor Assays

Substances

  • Antineoplastic Agents
  • Protein Kinase Inhibitors
  • WNT3A protein, human
  • Wnt3A Protein
  • Polyethylene Glycols
  • pegaspargase
  • GSK3B protein, human
  • Glycogen Synthase Kinase 3 beta
  • Proteasome Endopeptidase Complex
  • Asparaginase