Lipid-derived electrophiles mediate the effects of chemotherapeutic topoisomerase I poisons.
Lipid-derived electrophiles mediate the effects of chemotherapeutic topoisomerase I poisons.
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DOI:
10.1016/j.chembiol.2020.11.011
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发表时间:
2021-06-17
影响因子:
8.6
通讯作者:
Kron SJ
中科院分区:
文献类型:
--
作者:
Flor A;Wolfgeher D;Li J;Hanakahi LA;Kron SJ
Topoisomerase 1 (Top1) reversibly nicks chromosomal DNA to relax strain accumulated during transcription, replication, chromatin assembly and chromosome condensation. The Top1 poison camptothecin targets cancer cells by trapping the enzyme in the covalent complex, Top1cc, tethered to cleaved DNA by a tyrosine-3′ phosphate bond. In vitro mechanistic studies point to interfacial inhibition, where camptothecin binding to the Top1-DNA interface stabilizes Top1cc. Here we present a complementary covalent mechanism that is critical in vivo. We observed that camptothecins induce oxidative stress, leading to lipid peroxidation, lipid-derived electrophile accumulation and Top1 poisoning via covalent modification. The electrophile 4-hydroxy-2-nonenal (HNE) can induce Top1cc on its own and forms a Michael adduct to a cysteine thiol in the Top1 active site, potentially blocking tyrosine dephosphorylation and 3′ DNA phosphate release. Thereby, camptothecins may leverage a physiological cysteine-based redox switch in Top1 to mediate their selective toxicity to rapidly proliferating cancer cells. The camptothecins are important chemotherapy agents that poison Top1 by trapping the protein covalently bound to cleaved DNA. Here, we show camptothecins and other Top1 poisons induce oxidative stress and lipid peroxidation, resulting in modification of Top1 by lipid-derived electrophiles. This covalent mechanism of action may determine cytotoxicity in vivo.
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影响因子:
--
作者:
Ayala A;Muñoz MF;Argüelles S
通讯作者:
Argüelles S
影响因子:
2.9
作者:
Elsea, SH;Westergaard, M;Osheroff, N
通讯作者:
Osheroff, N
影响因子:
15.9
作者:
Hiraoka, W;Vazquez, N;Pommier, Y
通讯作者:
Pommier, Y
影响因子:
5.8
作者:
Craig, R;Beavis, RC
通讯作者:
Beavis, RC
DOI:
10.1042/bcj20160583
发表时间:
2018-01-23
期刊:
The Biochemical journal
影响因子:
--
作者:
Delgado JL;Hsieh CM;Chan NL;Hiasa H
通讯作者:
Hiasa H