Journal article
Manganese superoxide dismutase activity regulates transitions between quiescent and proliferative growth
Aging cell, Vol.7(3), pp.405-417
06/2008
DOI: 10.1111/j.1474-9726.2008.00384.x
PMCID: PMC2538945
PMID: 18331617
Abstract
In recent years, the intracellular reactive oxygen species (ROS) levels have gained increasing attention as a critical regulator of cellular proliferation. We investigated the hypothesis that manganese superoxide dismutase (MnSOD) activity regulates proliferative and quiescent growth by modulating cellular ROS levels. Decreasing MnSOD activity favored proliferation in mouse embryonic fibroblasts (MEF), while increasing MnSOD activity facilitated proliferating cells' transitions into quiescence. MnSOD +/- and -/- MEFs demonstrated increased superoxide steady-state levels; these fibroblasts failed to exit from the proliferative cycle, and showed increasing cyclin D1 and cyclin B1 protein levels. MnSOD +/- MEFs exhibited an increase in the percentage of G(2) cells compared to MnSOD +/+ MEFs. Overexpression of MnSOD in MnSOD +/- MEFs suppressed superoxide levels and G(2) accumulation, decreased cyclin B1 protein levels, and facilitated cells' transit into quiescence. While ROS are known to regulate differentiation and cell death pathways, both of which are irreversible processes, our results show MnSOD activity and, therefore, mitochondria-derived ROS levels regulate cellular proliferation and quiescence, which are reversible processes essential to prevent aberrant proliferation and subsequent exhaustion of normal cell proliferative capacity. These results support the hypothesis that MnSOD activity regulates a mitochondrial 'ROS-switch' favoring a superoxide-signaling regulating proliferation and a hydrogen peroxide-signaling supporting quiescence.
Details
- Title: Subtitle
- Manganese superoxide dismutase activity regulates transitions between quiescent and proliferative growth
- Creators
- Ehab H Sarsour - Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA 52242, USASujatha VenkataramanAmanda L KalenLarry W OberleyPrabhat C Goswami
- Resource Type
- Journal article
- Publication Details
- Aging cell, Vol.7(3), pp.405-417
- Publisher
- England
- DOI
- 10.1111/j.1474-9726.2008.00384.x
- PMID
- 18331617
- PMCID
- PMC2538945
- ISSN
- 1474-9718
- eISSN
- 1474-9726
- Grant note
- R01 CA111365-03 / NCI NIH HHS CA 111365 / NCI NIH HHS R01 CA111365 / NCI NIH HHS
- Language
- English
- Date published
- 06/2008
- Academic Unit
- Radiation Oncology
- Record Identifier
- 9984046912202771
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