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Updated: Jun 23, 2026

Generation and Isolation of Cell Cycle-arrested Cells with Complex Karyotypes
05:22

Generation and Isolation of Cell Cycle-arrested Cells with Complex Karyotypes

Published on: April 13, 2018

Inhibition of KSP by ARRY-520 induces cell cycle block and cell death via the mitochondrial pathway in AML cells

B Z Carter1, D H Mak, R Woessner

  • 1Department of Stem Cell Transplantation and Cellular Therapy, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.

Leukemia
|May 22, 2009
PubMed

Insights

ARRY-520, a Kinesin Spindle Protein (KSP) inhibitor, effectively triggers apoptosis in acute myeloid leukemia (AML) cells by blocking cell cycle progression. This targeted therapy shows promise in eradicating leukemic progenitor cells.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Kinesin Spindle Protein (KSP) is a motor protein crucial for cell division, often overexpressed in cancers, making it a potential therapeutic target.
  • Acute myeloid leukemia (AML) is a cancer where KSP is frequently overexpressed, indicating a potential vulnerability.

Purpose of the Study:

  • To investigate the efficacy of the selective KSP inhibitor ARRY-520 in targeting acute myeloid leukemia (AML) cells.
  • To elucidate the mechanism of action of ARRY-520 in AML, including its effects on cell cycle progression and apoptosis.

Main Methods:

  • Treatment of AML cell lines with ARRY-520.
  • Assessment of cell cycle progression, apoptosis, and protein levels (e.g., Bim).
  • Evaluation of ARRY-520's efficacy in xenograft mouse models and its effect on normal hematopoietic progenitor cells.

Main Results:

  • ARRY-520 induced cell cycle arrest and apoptosis in KSP-expressing AML cell lines, independent of p53, XIAP, or the extrinsic pathway.
  • Apoptosis was mediated through the mitochondrial pathway, as evidenced by blunted cell death in Bcl-2 overexpressing cells and synergy with Bcl-2 inhibition.
  • ARRY-520 demonstrated significant anti-leukemic activity in vivo, inhibiting tumor growth and AML progenitor cells without affecting normal colony formation.

Conclusions:

  • ARRY-520 is a potent inducer of cell cycle arrest and apoptosis in leukemic cells via the mitochondrial pathway.
  • The KSP inhibitor ARRY-520 shows significant potential for eradicating AML progenitor cells and warrants further clinical investigation.

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