Abstract
Altered oncogene expression in cancer cells causes loss of redox homeostasis resulting in oxidative DNA damage, e.g. 8-oxoguanine (8-oxoG), repaired by base excision repair (BER). PARP1 coordinates BER and relies on the upstream 8-oxoguanine-DNA glycosylase (OGG1) to recognise and excise 8-oxoG. Here we hypothesize that OGG1 may represent an attractive target to exploit reactive oxygen species (ROS) elevation in cancer. Although OGG1 depletion is well tolerated in non-transformed cells, we report here that OGG1 depletion obstructs A3 T-cell lymphoblastic acute leukemia growth in vitro and in vivo, validating OGG1 as a potential anti-cancer target. In line with this hypothesis, we show that OGG1 inhibitors (OGG1i) target a wide range of cancer cells, with a favourable therapeutic index compared to non-transformed cells. Mechanistically, OGG1i and shRNA depletion cause S-phase DNA damage, replication stress and proliferation arrest or cell death, representing a novel mechanistic approach to target cancer. This study adds OGG1 to the list of BER factors, e.g. PARP1, as potential targets for cancer treatment.
© The Author(s) 2020. Published by Oxford University Press on behalf of Nucleic Acids Research.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Antineoplastic Agents / chemical synthesis
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Antineoplastic Agents / pharmacology
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Cell Line, Tumor
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Cell Proliferation / drug effects
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Colonic Neoplasms / drug therapy*
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Colonic Neoplasms / genetics
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Colonic Neoplasms / metabolism
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Colonic Neoplasms / mortality
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DNA Damage
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DNA Glycosylases / antagonists & inhibitors
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DNA Glycosylases / genetics*
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DNA Glycosylases / metabolism
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DNA Repair / drug effects
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DNA Replication / drug effects
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DNA, Neoplasm / genetics*
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DNA, Neoplasm / metabolism
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Enzyme Inhibitors / chemical synthesis
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Enzyme Inhibitors / pharmacology
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Gene Expression Regulation, Neoplastic*
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Guanine / analogs & derivatives
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Guanine / metabolism
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HCT116 Cells
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Humans
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Mice
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Mice, Nude
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Molecular Targeted Therapy
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Oxidative Stress
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Poly (ADP-Ribose) Polymerase-1 / immunology*
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Poly (ADP-Ribose) Polymerase-1 / metabolism
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RNA, Small Interfering / genetics
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RNA, Small Interfering / metabolism
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Reactive Oxygen Species / antagonists & inhibitors
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Reactive Oxygen Species / metabolism
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Signal Transduction
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Survival Analysis
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Tumor Burden / drug effects
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Xenograft Model Antitumor Assays
Substances
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Antineoplastic Agents
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DNA, Neoplasm
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Enzyme Inhibitors
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RNA, Small Interfering
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Reactive Oxygen Species
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8-hydroxyguanine
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Guanine
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PARP1 protein, human
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Poly (ADP-Ribose) Polymerase-1
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DNA Glycosylases
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oxoguanine glycosylase 1, human