title: Influence of persistent organic pollutants on oxidative stress in population-based samples.
abstract: Persistent organic pollutants (POPs) are a large group of chemicals widely used and produced in various industrial applications. Many cell culture/animal studies have shown that POPs can induce oxidative stress. Since such data is lacking in humans, we conducted a large population-based study to analyze associations between POPs and oxidative stress markers. We measured following POPs; 16 polychlorinated biphenyls (PCBs), 5 organochlorine (OC) pesticides, octachlorinated dibenzo-p-dioxin, and polybrominated diphenyl ether 47, and oxidative stress markers; homocysteine, reduced [GSH] and oxidized glutathione [GSSG], glutathione ratio [GSSG/GSH], total glutathione, oxidized low-density lipoprotein [ox-LDL], ox-LDL antibodies, conjugated dienes, baseline conjugated dienes of LDL, and total anti-oxidative capacity in plasma samples collected from 992 70-year old individuals (50% women) from the population-based Prospective Investigation of the Vasculature in Uppsala Seniors (PIVUS) cohort. Linear regression analyses were performed to study the associations between oxidative stress markers and summary measures of POPs including the total toxic equivalence (TEQ), sums of PCBs and OC pesticides (main exposures) while adjusting for potential confounders. In multivariable-adjusted analyses, sum of PCBs showed strong associations with ox-LDL (β=0.94; P=2.9*10(-6)). Further, sum of PCBs showed association with glutathione-related markers (GSSG: β=-0.01; P=6.0*10(-7); GSSG/GSH: β=-0.002; P=9.7*10(-10)), although in reverse direction. Other summary measures did not show any significant association with these markers. In our study of elderly individuals from the general population, we show that plasma levels of POPs are associated with markers of increased oxidative stress thereby suggesting that even low dose background exposure to POPs may be involved in oxidative stress.
authors.affiliation: Department of Medical Sciences, Molecular Epidemiology and Science for Life Laboratory, Uppsala University, Uppsala, Sweden. Electronic address: Jitender.Kumar@medsci.uu.se.
authors.forename: Jitender
authors.initials: J
authors.lastname: Kumar
authors.affiliation: Department of Medical Sciences, Occupational and Environmental Medicine, Uppsala University, Uppsala, Sweden.
authors.forename: P
authors.initials: P
authors.lastname: Monica Lind
authors.affiliation: Department of Medical Sciences, Cardiovascular Epidemiology, Uppsala University, Uppsala, Sweden.
authors.forename: Samira
authors.initials: S
authors.lastname: Salihovic
authors.affiliation: MTM Research Centre, School of Science and Technology, Örebro University, Örebro, Sweden.
authors.forename: Bert
authors.initials: B
authors.lastname: van Bavel
authors.affiliation: Department of Medical Sciences, Cardiovascular Epidemiology, Uppsala University, Uppsala, Sweden.
authors.forename: Lars
authors.initials: L
authors.lastname: Lind
authors.affiliation: Department of Medical Sciences, Molecular Epidemiology and Science for Life Laboratory, Uppsala University, Uppsala, Sweden.
authors.forename: Erik
authors.initials: E
authors.lastname: Ingelsson
mesh_terms: D000368:Aged; D000818:Animals; D004147:Dioxins / Q000097:blood*; D004785:Environmental Pollutants / Q000097:blood*; D005260:Female; D005978:Glutathione / Q000097:blood; D006801:Humans; D006843:Hydrocarbons, Chlorinated / Q000097:blood*; D008077:Lipoproteins, LDL / Q000097:blood; D008297:Male; D018384:Oxidative Stress; D010575:Pesticides / Q000097:blood*; D011078:Polychlorinated Biphenyls / Q000097:blood*; D011446:Prospective Studies
chemical_list: D004147:Dioxins; D004785:Environmental Pollutants; D006843:Hydrocarbons, Chlorinated; D008077:Lipoproteins, LDL; D010575:Pesticides; C099252:oxidized low density lipoprotein; D011078:Polychlorinated Biphenyls; D005978:Glutathione; C020887:dibenzo(1,4)dioxin
keywords: Epidemiology; Glutathione; Oxidative stress; Oxidized LDL; Persistent organic pollutants