Journal article
Protective effects of selenium against DNA adduct formation in Inuit environmentally exposed to PCBs
Environment international, Vol.36(8), pp.980-986
2010
DOI: 10.1016/j.envint.2009.08.001
PMID: 19735942
Abstract
Dietary habits that expose populations to potential toxicants as well as protective agents simultaneously are a realistic scenario where a meaningful assessment of the interactions and net benefit or damage can be made. A group of Inuit from Salluit, Northern Canada are exposed to high levels of PCBs and selenium, both present in the Inuit traditional foods such as blubber from sea mammals and fatty fish. Blood samples were collected from 83 Inuit, 22–70
years old. Blood selenium and PCB levels were determined previously and ranged from 227 to 2069
µg/L and 1.7 to 143
µg/L, respectively. DNA isolated from white blood cells were analyzed by modified
32P-postlabeling adductomics technology that detects a multitude of highly polar to lipophilic adducts. The levels of 8-oxodG adducts ranged from 470 to 7400 adducts/10
9 nucleotides. Other as yet unidentified polar adducts showed a 30 to 800-fold inter-individual variability. Adduct levels were negatively associated with PCB and selenium levels. The subjects were classified into high and low ratio groups, with respect to selenium/PCB. In the high ratio group, the coefficient of selenium is significantly negatively correlated with 8-oxodG (
r
=
−
0.38,
p
=
0.014) and total adducts (
r
=
−
0.41,
p
=
0.009) while there was no correlation within the low selenium/PCB group. This study suggests that increasing selenium has mitigating effect in reducing DNA adducts and therefore, possible negative effects of PCB were not seen. A protective effect of selenium is highlighted.
Details
- Title: Subtitle
- Protective effects of selenium against DNA adduct formation in Inuit environmentally exposed to PCBs
- Creators
- Srivani Ravoori - James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202 USACidambi Srinivasan - Department of Statistics, University of Kentucky, Lexington, KY 40506, USADaria Pereg - Laval University Medical Research Center, Quebec, QC, Canada G1V 5B3Larry W Robertson - University of Iowa, Iowa City, IA 52242, USAPierre Ayotte - Laval University Medical Research Center, Quebec, QC, Canada G1V 5B3Ramesh C Gupta - James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202 USA
- Resource Type
- Journal article
- Publication Details
- Environment international, Vol.36(8), pp.980-986
- DOI
- 10.1016/j.envint.2009.08.001
- PMID
- 19735942
- NLM abbreviation
- Environ Int
- ISSN
- 0160-4120
- eISSN
- 1873-6750
- Publisher
- Elsevier Ltd
- Language
- English
- Date published
- 2010
- Academic Unit
- Occupational and Environmental Health
- Record Identifier
- 9984002578302771
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