Journal article
Inhibition of RNA polymerase I transcription initiation by CX-5461 activates non-canonical ATM/ATR signaling
J Quin, KT Chan, JR Devlin, DP Cameron, J Diesch, C Cullinane, J Ahern, A Khot, N Hein, AJ George, KM Hannan, G Poortinga, KE Sheppard, KK Khanna, RW Johnstone, D Drygin, GA McArthur, RB Pearson, E Sanij, RD Hannan
Oncotarget | IMPACT JOURNALS LLC | Published : 2016
Abstract
RNA polymerase I (Pol I)-mediated transcription of the ribosomal RNA genes (rDNA) is confined to the nucleolus and is a rate-limiting step for cell growth and proliferation. Inhibition of Pol I by CX-5461 can selectively induce p53-mediated apoptosis of tumour cells in vivo. Currently, CX-5461 is in clinical trial for patients with advanced haematological malignancies (Peter Mac, Melbourne). Here we demonstrate that CX-5461 also induces p53-independent cell cycle checkpoints mediated by ATM/ATR signaling in the absence of DNA damage. Further, our data demonstrate that the combination of drugs targeting ATM/ATR signaling and CX-5461 leads to enhanced therapeutic benefit in treating p53-null t..
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Grants
Awarded by National Health and Medical Research Council
Funding Acknowledgements
This work was supported by the National Health and Medical Research Council (NHMRC) of Australia project grants (#1043884, 251608, 566702, 166908, 251688, 509087, 400116, 400120, 566876) and a NHMRC Program Grant (#1053792). Researchers were funded by NHMRC Fellowships (R.W.J, G.A.M. R.D.H, R.B.P), Cancer Council of Victoria Sir Edward Weary Dunlop Fellowship (G.A.M) and Lorenzo and Pamela Galli Charitable Trust (G.A.M).