Unique anti-myeloma activity by thiazolidine-2,4-dione compounds with Pim inhibiting activity

Shiro Fujii, Shingen Nakamura, Asuka Oda, Hirokazu Miki, Hirofumi Tenshin, Jumpei Teramachi, Masahiro Hiasa, Ariunzaya Bat-Erdene, Yusaku Maeda, Masahiro Oura, Mamiko Takahashi, Masami Iwasa, Itsuro Endo, Sumiko Yoshida, Ken Ichi Aihara, Kiyoe Kurahashi, Takeshi Harada, Kumiko Kagawa, Michiyasu Nakao, Shigeki SanoMasahiro Abe

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Proviral Integrations of Moloney virus 2 (PIM2) is overexpressed in multiple myeloma (MM) cells, and regarded as an important therapeutic target. Here, we aimed to validate the therapeutic efficacy of different types of PIM inhibitors against MM cells for their possible clinical application. Intriguingly, the thiazolidine-2,4-dione-family compounds SMI-16a and SMI-4a reduced PIM2 protein levels and impaired MM cell survival preferentially in acidic conditions, in contrast to other types of PIM inhibitors, including AZD1208, CX-6258 and PIM447. SMI-16a also suppressed the drug efflux function of breast cancer resistance protein, minimized the sizes of side populations and reduced in vitro colony-forming capacity and in vivo tumourigenic activity in MM cells, suggesting impairment of their clonogenic capacity. PIM2 is known to be subject to ubiquitination-independent proteasomal degradation. Consistent with this, the proteasome inhibitors bortezomib and carfilzomib increased PIM2 protein levels in MM cells without affecting its mRNA levels. However, SMI-16a mitigated the PIM2 protein increase and cooperatively enhanced anti-MM effects in combination with carfilzomib. Collectively, the thiazolidine-2,4-dione-family compounds SMI-16a and SMI-4a uniquely reduce PIM2 protein in MM cells, which may contribute to their profound efficacy in addition to their immediate kinase inhibition. Their combination with proteasome inhibitors is envisioned.

Original languageEnglish
Pages (from-to)246-258
Number of pages13
JournalBritish Journal of Haematology
Volume180
Issue number2
DOIs
Publication statusPublished - Jan 2018
Externally publishedYes

Keywords

  • 4-dione compounds
  • PIM2
  • breast cancer resistance protein
  • multiple myeloma
  • proteasome inhibitor
  • thiazolidine-2

ASJC Scopus subject areas

  • Hematology

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