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Suberoylanilide hydroxamic acid (SAHA) and cladribine synergistically induce apoptosis in NK-LGL leukaemia
British Journal of Haematology
  • Xiaoshen Sun
  • Zainul S. Hasanali
  • Allshine Chen
  • Dianzheng Zhang, Philadelphia College of Osteopathic Medicine
  • Zin Liu
  • Hong Gang Wang
  • David J. Feith
  • Thomas P. Loughran, Jr.
  • Kailin Xu
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Natural killer (NK) large granular lymphocyte (LGL) leukaemia features a clonal proliferation of CDNK cells that can be classified into either aggressive or chronic categories. The NKL cell line, derived from an aggressive Asian NK cell leukaemia, and patient samples from chronic NK LGLleukaemia were used in our study to probe for synergistic efficacy of the epigenetic drugs vorinostat (SAHA) and cladribine in this disease. We demonstrate that histone deacetylases (HDACs) are over-expressed in both aggressive and chronic NK leukaemia. Administration of the HDAC inhibitor SAHA reduces class I and II HDAC expression and enhances histone acetylation in leukaemic NK cells. In vitro combination treatment with SAHA and cladribine dose-dependently exerts synergistic cytotoxic and apoptotic effects on leukaemic NK cells. Expression profiling of apoptotic regulatory genes suggests that both compounds led to caspase dependent apoptosis through activation of intrinsic mitochondrial and extrinsic death receptor pathways. Collectively, these data show that combined epigenetic therapy, using HDAC and DNA methyltransferase inhibitors, may be a promising therapeutic approach for NK-LGL leukaemia.

This article was published in British Journal of Haematology, Volume 168, Issue 3, October 2014, pages 371-383.

The published version is available at

Copyright ©2014 John Wiley & Sons Ltd.

Citation Information
Xiaoshen Sun, Zainul S. Hasanali, Allshine Chen, Dianzheng Zhang, et al.. "Suberoylanilide hydroxamic acid (SAHA) and cladribine synergistically induce apoptosis in NK-LGL leukaemia" British Journal of Haematology Vol. 168 Iss. 3 (2014) p. 371 - 383
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