Abstract:
:Heterobifunctional proteolysis-targeting chimeric compounds leverage the activity of E3 ligases to induce degradation of target oncoproteins and exhibit potent preclinical antitumor activity. To dissect the mechanisms regulating tumor cell sensitivity to different classes of pharmacological "degraders" of oncoproteins, we performed genome-scale CRISPR-Cas9-based gene editing studies. We observed that myeloma cell resistance to degraders of different targets (BET bromodomain proteins, CDK9) and operating through CRBN (degronimids) or VHL is primarily mediated by prevention of, rather than adaptation to, breakdown of the target oncoprotein; and this involves loss of function of the cognate E3 ligase or interactors/regulators of the respective cullin-RING ligase (CRL) complex. The substantial gene-level differences for resistance mechanisms to CRBN- versus VHL-based degraders explains mechanistically the lack of cross-resistance with sequential administration of these two degrader classes. Development of degraders leveraging more diverse E3 ligases/CRLs may facilitate sequential/alternating versus combined uses of these agents toward potentially delaying or preventing resistance.
journal_name
Cell Repjournal_title
Cell reportsauthors
Shirasaki R,Matthews GM,Gandolfi S,de Matos Simoes R,Buckley DL,Raja Vora J,Sievers QL,Brüggenthies JB,Dashevsky O,Poarch H,Tang H,Bariteau MA,Sheffer M,Hu Y,Downey-Kopyscinski SL,Hengeveld PJ,Glassner BJ,Dhimolea E,Odoi
10.1016/j.celrep.2020.108532subject
Has Abstractpub_date
2021-01-05 00:00:00pages
108532issue
1issn
2211-1247pii
S2211-1247(20)31521-7journal_volume
34pub_type
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