Investigational New Drugs

, Volume 29, Issue 6, pp 1206–1212

The synthetic heat shock protein 90 (Hsp90) inhibitor EC141 induces degradation of Bcr-Abl p190 protein and apoptosis of Ph-positive acute lymphoblastic leukemia cells

Authors

  • Wei-Gang Tong
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Zeev Estrov
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Yongtao Wang
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Susan O’Brien
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Stefan Faderl
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • David M. Harris
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Quin Van Pham
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Inbal Hazan-Halevy
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Zhiming Liu
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Patricia Koch
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Hagop Kantarjian
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
  • Michael J. Keating
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
    • Department of Leukemia, Unit 428The University of Texas M. D. Anderson Cancer Center
PRECLINICAL STUDIES

DOI: 10.1007/s10637-010-9465-8

Cite this article as:
Tong, W., Estrov, Z., Wang, Y. et al. Invest New Drugs (2011) 29: 1206. doi:10.1007/s10637-010-9465-8

Summary

The prognosis of patients with Philadelphia chromosome-positive (Ph+) acute lymphoblastic leukemia (ALL) is poor. Chemotherapy is rarely curative and tyrosine kinase inhibitors (TKIs) induce only transient responses. Heat shock protein 90 (Hsp90) is a chaperone protein that is important in signal transduction, cell cycle control, and transcription regulation in both normal and leukemia cells. In the current study, we tested the growth inhibitory and apoptotic effects of a novel Hsp90 inhibitor, EC141 on the Ph+ ALL lines Z-119, Z-181, and Z-33, as well as primary bone marrow-derived blasts from patients with newly diagnosed Ph+ ALL. We found that EC141 inhibited the growth of Ph+ ALL cells in a concentration-dependent manner with IC50 ranged from 1 to 10 nM. EC141 also inhibited the proliferation of primary bone marrow-derived blasts using the ALL blast colony assay. EC141 down-regulated Hsp90 and up-regulated Hsp70 protein levels, inhibited CrkL phosphorylation, and induced degradation of Bcr-Abl p190 protein through ubiquitin-dependent proteasomal pathway. Furthermore, exposure of Ph+ ALL cells to EC141 resulted in activation of caspase-3, cleavage of poly (ADP-ribose) polymerase (PARP), and induction of apoptosis. In conclusion, our data suggest that EC141 is a potent Hsp90 inhibitor with activity against Ph+ ALL. Further studies to investigate the anticancer effect of EC141 either as a single agent, or in combination in Ph+ ALL and other hematological malignancies are warranted.

Keywords

LeukemiaHsp90 inhibitorEC141ApoptosisPh+ ALL

Copyright information

© Springer Science+Business Media, LLC 2010