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• W2612228800 abstract "Platinum drug-induced cross-link repair requires the concerted activities of translesion synthesis (TLS), Fanconi anemia (FA), and homologous recombination repair pathways. The E2 ubiquitin-conjugating enzyme RAD6 is essential for TLS. Here, we show that RAD6 plays a universal role in platinum-based drug tolerance. Using a novel RAD6-selective small-molecule inhibitor (SMI#9) targeting the RAD6 catalytic site, we demonstrate that SMI#9 potentiates the sensitivities of cancer cells with innate or acquired cisplatin or oxaliplatin resistance. 5-Iododeoxyuridine/5-chlorodeoxyuridine pulse-labeling experiments showed that RAD6 is necessary for overcoming cisplatin-induced replication fork stalling, as replication-restart was impaired in both SMI#9-pretreated and RAD6B-silenced cells. Consistent with the role of RAD6/TLS in late-S phase, SMI#9-induced DNA replication inhibition occurred preferentially in mid/late-S phase. The compromised DNA repair and chemosensitization induced by SMI#9 or RAD6B depletion were associated with decreased platinum drug-induced proliferating cell nuclear antigen (PCNA) and FANCD2 monoubiquitinations (surrogate markers of TLS and FA pathway activation, respectively) and with attenuated FANCD2, RAD6, γH2AX, and POL η foci formation and cisplatin-adduct removal. SMI#9 pretreatment synergistically increased cisplatin inhibition of MDA-MB-231 triple-negative breast cancer cell proliferation and tumor growth. Using an isogenic HCT116 colon cancer model of oxaliplatin resistance, we further show that γH2AX and monoubiquitinated PCNA and FANCD2 are constitutively up-regulated in oxaliplatin-resistant HCT116 (HCT116-OxR) cells and that γH2AX, PCNA, and FANCD2 monoubiquitinations are induced by oxaliplatin in parental HCT116 cells. SMI#9 pretreatment sensitized HCT116-OxR cells to oxaliplatin. These data deepen insights into the vital role of RAD6/TLS in platinum drug tolerance and reveal clinical benefits of targeting RAD6 with SMI#9 for managing chemoresistant cancers." @default.
• W2612228800 created "2017-05-19" @default.
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• W2612228800 date "2017-06-01" @default.
• W2612228800 modified "2023-10-04" @default.
• W2612228800 title "Pharmacological targeting of RAD6 enzyme-mediated translesion synthesis overcomes resistance to platinum-based drugs" @default.
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• W2612228800 doi "https://doi.org/10.1074/jbc.m117.792192" @default.
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