Significance of AZD1152 as a potential treatment against Aurora B overexpression in acute promyelocytic leukemia.
Aurora B kinase as a chromosomal passenger protein plays multiple roles in regulating mitosis and cytokinesis. The function of Aurora B in leukemic cells has made it an important treatment target. In this study, we explored the expressions of Aurora (A, B, and C) kinases in newly diagnosed acute promyelocytic leukemia (APL) patients. In addition, we investigated the effects of AZD1152 as a specific inhibitor of Aurora B on cell survival, DNA synthesis, nuclear morphology, apoptosis induction, cell cycle distribution, and gene expression in an APL-derived NB4 cell line. Our results showed that Aurora B was overexpressed in 88 % of APL patients. AZD1152 treatment of NB4 cells led to viability reduction and G2/M arrest followed by an increase in cell size and polyploidy induction. These giant cells showed morphological evidence of mitotic catastrophe. AZD1152 treatment induced activation of G2/M checkpoint which in turn led to transient G2/M arrest in a p21-independent manner. Lack of functional p53 in NB4 cells might provide an opportunity to escape from G2/M block and to endure repeated rounds of replication and polyploidy. Treated cells were probably eliminated via p73-mediated overexpression of BAX, PUMA, and APAF1 and downregulation of survivin and MCL-1. In summary, AZD1152 treatment led to endomitosis and polyploidy in TP53-mutated NB4 cells. These giant polyploid cells might undergo mitotic catastrophe and p73-mediated apoptosis. It seems that induction of polyploidy via AZD1152 could be a novel form of anti-cancer therapy for APL that may be clinically accessible in the near future.
['Ghanizadeh-Vesali|Samad|S|', 'Zekri|Ali|A|', 'Zaker|Farhad|F|', 'Zaghal|Azam|A|', 'Yousefi|Meysam|M|', 'Alimoghaddam|Kamran|K|', 'Ghavamzadeh|Ardeshir|A|', 'Ghaffari|Seyed H|SH|']
D000328:Adult D064107:Aurora Kinase B D045744:Cell Line, Tumor D049109:Cell Proliferation D004305:Dose-Response Relationship, Drug D005260:Female D015972:Gene Expression Regulation, Neoplastic D006801:Humans D015473:Leukemia, Promyelocytic, Acute D008297:Male D008875:Middle Aged D010755:Organophosphates D047428:Protein Kinase Inhibitors D011799:Quinazolines D016896:Treatment Outcome
AZD1152 Acute promyelocytic leukemia Aurora B kinase Apoptosis Cell cycle arrest p73