PBA2, a novel inhibitor of imatinib-resistant BCR-ABL T315I mutation in chronic myeloid leukemia

Pranav Gupta, Rishil J. Kathawala, Liuya Wei, Fang Wang, Xiao Kun Wang, Brian J. Druker, Li Wu Fu, Zhe Sheng Chen

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Chronic Myeloid Leukemia (CML) is largely caused by the Philadelphia (Ph) chromosome carrying the Break point Cluster Region-Abelson (BCR-ABL) oncogene. Imatinib is a BCR-ABL-targeted therapy and considered the standard of care in CML management. Resistance to imatinib therapy often develops because of mutations in the BCR-ABL kinase domain. In this study, we evaluated PBA2, a novel BCR-ABL inhibitor, for its anti-cancer activity against BCR-ABL expressing BaF3 cells. PBA2 shows potent activity against wild-type and T315I mutated BaF3 cells as compared with imatinib. PBA2 inhibited the phosphorylation of BCR-ABL and its downstream signaling in BaF3/WT and BaF3/T315I cells. PBA2 inhibited the mRNA expression of BCR-ABL in BaF3/WT and BaF3/T315I cells. Mechanistically, PBA2 increased the cell population in sub G1 phase of the cell cycle, induced apoptosis and elevated ROS production in both BaF3/WT and BaF3/T315I cells. Taken together, our results indicate that PBA2 exhibits anti-proliferative effects and inhibits the imatinib-resistant T315I BCR-ABL mutation. PBA2 may be a novel drug candidate for overcoming the resistance to imatinib in CML patients.

Original languageEnglish (US)
Pages (from-to)220-229
Number of pages10
JournalCancer Letters
Issue number2
StatePublished - Dec 28 2016


  • Chronic myeloid leukemia
  • PBA2
  • Resistance
  • T315I

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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