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• W608896803 startingPage "45" @default.
• W608896803 abstract "Despite numerous studies suggesting a dramatic decline of amphibians, the biochemical mechanisms of adaptation in these animals to polluted environment are poorly studied. The aim of this study was to elucidate the ability to release cobalt (Co) and zinc (Zn) from their nanoscale complexes (NCs) derived from the polymeric substance of N-vinylpyrrolidone (PS) in the liver of amphibian (Rana ridibunda). Frog males were subjected to 14 days exposure to waterborne Co2 + (50 μg/L), Zn2 + (100 μg/L), as well as corresponding concentrations of Co-NC, Zn-NC or PS. Main attention was paid to MT's interrelations with indices of stress and toxicity. Only Co2 + and Zn2 + caused elevation of the correspondent metal in MTs. Co2 + caused down-regulation of cathepsin D activity, while Zn2 +, Zn-NC and the PS up-regulated this activity. Zn2 + provoked 1.6 times increase of metal-bounded form of the MT (MT-Me), while all other exposures caused the elevation of the ratio of MT total protein concentration (MT-SH) and concentrations of the MT-Me and/or immunoreactive (MTi) form (up to ~ 10 times) accompanied by a decrease in the levels of oxyradicals. The increased DNA fragmentation and down-regulation of caspase-3 activity in relation to the redox state of glutathione and/or lactate/pyruvate were shown at all exposures. These data indicate the vulnerability of the redox state of cellular thiols and inability to release Co and Zn from NCs in frog's liver." @default.
• W608896803 created "2016-06-24" @default.
• W608896803 creator A5005178571 @default.
• W608896803 creator A5014969913 @default.
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• W608896803 creator A5043546894 @default.
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• W608896803 creator A5082725994 @default.
• W608896803 date "2015-06-01" @default.
• W608896803 modified "2023-10-17" @default.
• W608896803 title "Hepatic metallothioneins in molecular responses to cobalt, zinc, and their nanoscale polymeric composites in frog Rana ridibunda" @default.
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