Oxidative stress increases M1dG, a major peroxidation-derived DNA adduct, in mitochondrial DNA
| Autor: | Philip J. Kingsley, Thomas R. Blackwell, Lawrence J. Marnett, Ha-Na Shim, James J. Galligan, William D Sanders, Thong Luong, Mark deCaestecker, Jeannie M. Camarillo, William N. Beavers, Orrette R. Wauchope, Michelle M. Mitchener, Joshua P. Fessel |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Mitochondrial DNA Hypertension Pulmonary Mice Transgenic Mitochondrion Biology Genome Integrity Repair and Replication medicine.disease_cause Bone Morphogenetic Protein Receptors Type II DNA Mitochondrial Electron Transport 03 medical and health sciences chemistry.chemical_compound DNA Adducts Mice 0302 clinical medicine Superoxides DNA adduct Genetics medicine Animals Humans chemistry.chemical_classification Reactive oxygen species Mutagenesis Endothelial Cells Purine Nucleosides Oxidants Molecular biology Nuclear DNA Mitochondria Oxidative Stress 030104 developmental biology chemistry Gene Expression Regulation 030220 oncology & carcinogenesis Lipid Peroxidation Reactive Oxygen Species Oxidative stress DNA |
| Zdroj: | Nucleic Acids Research |
| ISSN: | 1362-4962 0305-1048 |
| Popis: | Reactive oxygen species (ROS) are formed in mitochondria during electron transport and energy generation. Elevated levels of ROS lead to increased amounts of mitochondrial DNA (mtDNA) damage. We report that levels of M1dG, a major endogenous peroxidation-derived DNA adduct, are 50–100-fold higher in mtDNA than in nuclear DNA in several different human cell lines. Treatment of cells with agents that either increase or decrease mitochondrial superoxide levels leads to increased or decreased levels of M1dG in mtDNA, respectively. Sequence analysis of adducted mtDNA suggests that M1dG residues are randomly distributed throughout the mitochondrial genome. Basal levels of M1dG in mtDNA from pulmonary microvascular endothelial cells (PMVECs) from transgenic bone morphogenetic protein receptor 2 mutant mice (BMPR2R899X) (four adducts per 106 dG) are twice as high as adduct levels in wild-type cells. A similar increase was observed in mtDNA from heterozygous null (BMPR2+/−) compared to wild-type PMVECs. Pulmonary arterial hypertension is observed in the presence of BMPR2 signaling disruptions, which are also associated with mitochondrial dysfunction and oxidant injury to endothelial tissue. Persistence of M1dG adducts in mtDNA could have implications for mutagenesis and mitochondrial gene expression, thereby contributing to the role of mitochondrial dysfunction in diseases. |
| Databáze: | OpenAIRE |
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