title: Effect of Light at Night on oxidative stress markers in Golden spiny mice (Acomys russatus) liver.
abstract: Light at Night (LAN) suppresses melatonin (MLT) production, and effects metabolism, hormone secretion, gene expression and enzyme activity. Changes in antioxidant enzymes glutathione peroxidase (GPx) and superoxide dismutase (SOD), can be used as an indication for oxidative stress level. We assayed activity and expression of these enzymes in the liver of Acomys russatus exposed to LAN and treated with MLT. Short day (SD)-acclimated A. russatus, was exposed to 30min of LAN for two, seven or 21 nights. MLT impact was assessed simultaneously with two and seven nights of LAN exposure. GPx and SOD activities were measured. Gpx1 expression was evaluated by RT-PCR. There was a significant increase in GPx activity following LAN exposure for all acclimation durations, GPx activity was elevated after two nights of LAN and MLT treatment, Gpx1 expression was elevated by MLT after seven nights of LAN. SOD activity increased after two nights of LAN in MLT-treated A. russatus, GPx activity increased with the duration of LAN acclimation, indicating changes in liver redox status. Our results suggest that LAN is a stressor that influences oxidative stress. As in the other studies, MLT increases antioxidant activities, presumably attenuating stress response, in order to restore homeostasis.
authors.affiliation: The Israeli Center for Interdisciplinary Research in Chronobiology, Department of Evolutionary and Environmental Biology, Faculty of Natural Sciences, University of Haifa, Mount Carmel, Haifa 31905, Israel. alilach@yahoo.com
authors.forename: Lilach
authors.initials: L
authors.lastname: Ashkenazi
authors.forename: Abraham
authors.initials: A
authors.lastname: Haim
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D015415:Biomarkers / Q000378:metabolism; D003624:Darkness; D005979:Glutathione Peroxidase / Q000378:metabolism; D008027:Light; D008099:Liver / Q000201:enzymology* / Q000378:metabolism*; D008297:Male; D008550:Melatonin / Q000378:metabolism; D051379:Mice; D051189:Murinae / Q000378:metabolism*; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000502:physiology*; D013482:Superoxide Dismutase / Q000378:metabolism; D000094765:Glutathione Peroxidase GPX1
chemical_list: D000975:Antioxidants; D015415:Biomarkers; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D008550:Melatonin; D000094765:Glutathione Peroxidase GPX1; C000722068:Gpx1 protein, mouse