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An Organotypic High Throughput System for Characterization of Drug Sensitivity of Primary Multiple Myeloma Cells
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An Organotypic High Throughput System for Characterization of Drug Sensitivity of Primary Multiple Myeloma Cells

Published on: July 15, 2015

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RUNX proteins desensitize multiple myeloma to lenalidomide via protecting IKZFs from degradation

Nan Zhou1, Alvaro Gutierrez-Uzquiza1, Xiang Yu Zheng1

  • 1Department of Cancer Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Leukemia
|February 15, 2019
PubMed

Insights

Inhibiting RUNX proteins sensitizes multiple myeloma cells to lenalidomide therapy. This discovery offers a new strategy to improve treatment outcomes for refractory multiple myeloma patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Ikaros family zinc finger proteins (IKZF1 and IKZF3) drive multiple myeloma (MM) proliferation.
  • Immunomodulatory imide drugs (IMiDs), like lenalidomide, induce MM cell death by degrading IKZF1/IKZF3 via the Cereblon (CRBN) E3 ubiquitin ligase complex.

Purpose of the Study:

  • To identify novel therapeutic targets that can enhance the efficacy of IMiDs in treating refractory multiple myeloma.
  • To investigate the role of Runt-related transcription factors (RUNXs) in modulating the response to lenalidomide in MM.

Main Methods:

  • Utilized mass spectrometry-based screening to identify IKZF1/IKZF3 interacting proteins.
  • Employed genetic ablation and a small molecule inhibitor (AI-10-104) to target RUNX proteins.
  • Assessed the sensitization of myeloma cell lines and primary tumors to lenalidomide following RUNX inhibition.

Main Results:

  • Identified Runt-related transcription factors (RUNX1 and RUNX3) as novel interactors of IKZF1 and IKZF3.
  • Demonstrated that RUNX proteins interfere with CRBN-mediated ubiquitylation and degradation of IKZF1/IKZF3.
  • Showed that inhibition of RUNXs potentiates lenalidomide-induced myeloma cell death.

Conclusions:

  • RUNX proteins represent a key mechanism limiting IMiD efficacy in multiple myeloma.
  • Targeting RUNX proteins offers a promising strategy to overcome lenalidomide resistance in MM.
  • RUNX inhibition combined with IMiDs could improve therapeutic outcomes for refractory MM patients.

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