Abstract:
:Inhibition of the chaperone heat-shock protein 90 (HSP90) induces apoptosis, and it is a promising anti-cancer strategy. The mechanisms underpinning apoptosis activation following HSP90 inhibition and how they are modified during acquired drug resistance are unknown. We show for the first time that, to induce apoptosis, HSP90 inhibition requires the cooperation of multi BH3-only proteins (BID, BIK, PUMA) and the reciprocal suppression of the pro-survival BCL-2 family member MCL1, which occurs via inhibition of STAT5A. A subset of tumour cell lines exhibit dependence on MCL1 expression for survival and this dependence is also associated with tumour response to HSP90 inhibition. In the acquired resistance setting, MCL1 suppression in response to HSP90 inhibitors is maintained; however, a switch in MCL1 dependence occurs. This can be exploited by the BH3 peptidomimetic ABT737, through non-BCL-2-dependent synthetic lethality.
journal_name
Oncogenejournal_title
Oncogeneauthors
Busacca S,Law EW,Powley IR,Proia DA,Sequeira M,Le Quesne J,Klabatsa A,Edwards JM,Matchett KB,Luo JL,Pringle JH,El-Tanani M,MacFarlane M,Fennell DAdoi
10.1038/onc.2015.213subject
Has Abstractpub_date
2016-03-24 00:00:00pages
1483-92issue
12eissn
0950-9232issn
1476-5594pii
onc2015213journal_volume
35pub_type
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