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Pàgina inicial > Articles > Articles publicats > Small molecule inhibitor of OGG1 blocks oxidative DNA damage repair at telomeres and potentiates methotrexate anticancer effects |
Data: | 2021 |
Resum: | The most common oxidative DNA lesion is 8-oxoguanine which is mainly recognized and excised by the 8-oxoG DNA glycosylase 1 (OGG1), initiating the base excision repair (BER) pathway. Telomeres are particularly sensitive to oxidative stress (OS) which disrupts telomere homeostasis triggering genome instability. In the present study, we have investigated the effects of inactivating BER in OS conditions, by using a specific inhibitor of OGG1 (TH5487). We have found that in OS conditions, TH5487 blocks BER initiation at telomeres causing an accumulation of oxidized bases, that is correlated with telomere losses, micronuclei formation and mild proliferation defects. Moreover, the antimetabolite methotrexate synergizes with TH5487 through induction of intracellular reactive oxygen species (ROS) formation, which potentiates TH5487-mediated telomere and genome instability. Our findings demonstrate that OGG1 is required to protect telomeres from OS and present OGG1 inhibitors as a tool to induce oxidative DNA damage at telomeres, with the potential for developing new combination therapies for cancer treatment. |
Ajuts: | European Commission 695376 European Commission 722729 Instituto de Salud Carlos III PI16/00440 Instituto de Salud Carlos III PI17/02303 Instituto de Salud Carlos III PI19/00640 |
Nota: | Altres ajuts: Swedish Children's Cancer Foundation (PR2018-0095) |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Matèria: | Antimetabolites, Antineoplastic ; Benzimidazoles ; Cell Cycle ; Cell Line, Tumor ; DNA Glycosylases ; DNA Repair ; Drug Synergism ; Enzyme Inhibitors ; Genomic Instability ; Humans ; Methotrexate ; Oxidation-Reduction ; Oxidative Stress ; Piperidines ; Reactive Oxygen Species ; Telomere |
Publicat a: | Scientific reports, Vol. 11 Núm. 1 (december 2021) , p. 3490, ISSN 2045-2322 |
14 p, 2.4 MB |