Journal article
Polychlorinated-biphenyl-induced oxidative stress and cytotoxicity can be mitigated by antioxidants after exposure
Free radical biology & medicine, Vol.47(12), pp.1762-1771
2009
DOI: 10.1016/j.freeradbiomed.2009.09.024
PMID: 19796678
Abstract
PCBs and PCB metabolites have been suggested to cause cytotoxicity by inducing oxidative stress, but the effectiveness of antioxidant intervention after exposure has not been established. Exponentially growing MCF-10A human breast and RWPE-1 human prostate epithelial cells continuously exposed for 5 days to 3 μM PCBs [Aroclor 1254 (Aroclor), PCB153, and the 2-(4-chlorophenyl)-1,4-benzoquinone metabolite of PCB3 (4ClBQ)] were found to exhibit growth inhibition and clonogenic cell killing, with 4ClBQ having the most pronounced effects. These PCBs were also found to increase steady-state levels of intracellular O
2
·− and H
2O
2 (as determined by dihydroethidium, MitoSOX red, and 5-(and 6)-carboxy-2′,7′-dichlorodihydrofluorescein diacetate oxidation). These PCBs also caused 1.5- to 5.0-fold increases in MnSOD activity in MCF-10A cells and 2.5- to 5-fold increases in CuZnSOD activity in RWPE-1 cells. Measurement of MitoSOX red oxidation with confocal microscopy coupled with colocalization of MitoTracker green in MCF-10A and RWPE-1 cells supported the hypothesis that PCBs caused increased steady-state levels of O
2
·− in mitochondria. Finally, treatment with either
N-acetylcysteine (NAC) or the combination of polyethylene glycol (PEG)-conjugated CuZnSOD and PEG–catalase added 1 h after PCBs significantly protected these cells from PCB toxicity. These results support the hypothesis that exposure of exponentially growing human breast and prostate epithelial cells to PCBs causes increased steady-state levels of intracellular O
2
·− and H
2O
2, induction of MnSOD or CuZnSOD activity, and clonogenic cell killing that could be inhibited by a clinically relevant thiol antioxidant, NAC, as well as by catalase and superoxide dismutase after PCB exposure.
Details
- Title: Subtitle
- Polychlorinated-biphenyl-induced oxidative stress and cytotoxicity can be mitigated by antioxidants after exposure
- Creators
- Yueming Zhu - Free Radical and Radiation Biology Program, B180 Medical Laboratories, Department of Radiation Oncology, Holden Comprehensive Cancer Center, Iowa City, IA 52242, USAAmanda L Kalen - Free Radical and Radiation Biology Program, B180 Medical Laboratories, Department of Radiation Oncology, Holden Comprehensive Cancer Center, Iowa City, IA 52242, USALing Li - Free Radical and Radiation Biology Program, B180 Medical Laboratories, Department of Radiation Oncology, Holden Comprehensive Cancer Center, Iowa City, IA 52242, USAHans-J Lehmler - Occupational and Environmental Health, University of Iowa, Iowa City, IA 52242, USALarry W Robertson - Occupational and Environmental Health, University of Iowa, Iowa City, IA 52242, USAPrabhat C Goswami - Free Radical and Radiation Biology Program, B180 Medical Laboratories, Department of Radiation Oncology, Holden Comprehensive Cancer Center, Iowa City, IA 52242, USADouglas R Spitz - Free Radical and Radiation Biology Program, B180 Medical Laboratories, Department of Radiation Oncology, Holden Comprehensive Cancer Center, Iowa City, IA 52242, USANukhet Aykin-Burns - Free Radical and Radiation Biology Program, B180 Medical Laboratories, Department of Radiation Oncology, Holden Comprehensive Cancer Center, Iowa City, IA 52242, USA
- Resource Type
- Journal article
- Publication Details
- Free radical biology & medicine, Vol.47(12), pp.1762-1771
- DOI
- 10.1016/j.freeradbiomed.2009.09.024
- PMID
- 19796678
- NLM abbreviation
- Free Radic Biol Med
- ISSN
- 0891-5849
- eISSN
- 1873-4596
- Publisher
- Elsevier Inc
- Language
- English
- Date published
- 2009
- Academic Unit
- Occupational and Environmental Health; Pathology; Iowa Neuroscience Institute; Radiation Oncology
- Record Identifier
- 9984001080102771
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