The multi-kinase inhibitor TG02 overcomes signalling activation by survival factors to deplete MCL1 and XIAP and induce cell death in primary acute myeloid leukaemia cells.

Abstract:

:The novel multi-kinase inhibitor TG02 has selectivity against cell cycle and transcriptional cyclin dependent kinases (CDKs) as well as fms-like tyrosine kinase receptor-3 (FLT3). Inhibition of transcriptional CDKs preferentially depletes short-lived proteins such as MCL1. We evaluated the in vitro toxicity of TG02 to primary acute myeloid leukaemia (AML) cells in the presence of survival signalling pathway activation by cytokines and fibronectin. One hundred nanomolar TG02 induced a median decrease of 40% in bulk cell survival and 43% in the CD34(+) CD38(-) CD123(+) subset. A 90% inhibitory concentration of 500 nmol/l indicated that TG02 toxicity is not halted by protective cell cycle arrest. Samples with FLT3 internal tandem duplication were not preferentially targeted. By flow cytometry, TG02 treatment caused loss of RNA Polymerase II serine 2 phosphorylation in patient samples, which correlated strongly with BAX activation (R(2) =0·89), suggesting these as potential biomarkers for clinical studies. MCL1 and XIAP expression also decreased. Repeated brief exposure to TG02 in MOLM-13 cells did not result in compensatory up-regulation of survival protein expression. In conclusion, TG02 is potently cytotoxic towards CD34(+) CD38(-) CD123(+) and bulk AML cells, despite protective signalling pathway activation. This antitumour activity is most likely mediated by dephosphorylation of RNA Polymerase II leading to depletion of survival molecules such as MCL1 and XIAP, with subsequent BAX activation and apoptosis.

journal_name

Br J Haematol

authors

Pallis M,Abdul-Aziz A,Burrows F,Seedhouse C,Grundy M,Russell N

doi

10.1111/bjh.12018

subject

Has Abstract

pub_date

2012-10-01 00:00:00

pages

191-203

issue

2

eissn

0007-1048

issn

1365-2141

journal_volume

159

pub_type

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