Physiological Levels of Reactive Oxygen Species Are Required to Maintain Genomic Stability in Stem Cells

Overview

Journal Stem Cells

Publisher Oxford University Press

Specialties Cell Biology
Reproductive Medicine

Date 2010 May 28

PMID 20506176

Citations 74

Authors

Tao-Sheng Li

Eduardo Marban

Affiliations

Soon will be listed here.

Abstract

Stem cell cytogenetic abnormalities constitute a roadblock to regenerative therapies. We investigated the possibility that reactive oxygen species (ROSs) influence genomic stability in cardiac and embryonic stem cells. Karyotypic abnormalities in primary human cardiac stem cells were suppressed by culture in physiological (5%) oxygen, but addition of antioxidants to the medium unexpectedly increased aneuploidy. Intracellular ROS levels were moderately decreased in physiological oxygen, but dramatically decreased by the addition of high-dose antioxidants. Quantification of DNA damage in cardiac stem cells and in human embryonic stem cells revealed a biphasic dose-dependence: antioxidants suppressed DNA damage at low concentrations, but potentiated such damage at higher concentrations. High-dose antioxidants decreased cellular levels of ATM (ataxia-telangiectasia mutated) and other DNA repair enzymes, providing a potential mechanistic basis for the observed effects. These results indicate that physiological levels of intracellular ROS are required to activate the DNA repair pathway for maintaining genomic stability in stem cells. The concept of an "oxidative optimum" for genomic stability has broad implications for stem cell biology and carcinogenesis.

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