NDLI: PCB-Induced Oxidative Stress in the Unicellular Marine Dinoflagellate Lingulodinium polyedrum

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PCB-Induced Oxidative Stress in the Unicellular Marine Dinoflagellate Lingulodinium polyedrum

Content Provider	Springer Nature Link
Author	Leitão, M. A. da S. Cardozo, K. H. M. Pinto, E. Colepicolo, P.
Copyright Year	2003
Abstract	The susceptibility of the dinoflagellate Lingulodinium polyedrum to Arochlor 1254, a commercial mixture of polychlorinated biphenyl (PCB) congeners was examined through toxicity bioassays based on cell survival and measures of oxidative balance and adaptive response to PCB stress. The highest Arochlor 1254 concentration that did not cause observed effects (NOEC) on cell growth was 100 (48 h) and 25 ppb (96 h). The concentration that caused maximum effect (MEC) was 300 ppb (48 h) and 250 ppb (µl L–1) (96 h). The concentrations that promoted 50% cell death (LC50) were 146 and 122 ppb after 48 and 96 h, respectively. The cell numbers were lower after 96 h of exposure than after 48 h, suggesting that neither recovery nor growth occurred.Under exposure to 120 ppb Arochlor 1254 for 48 h the oxidative damage in proteins was 121% higher than the control, as measured by reactive carbonyl levels, but no oxidative damage was found in lipids measured as malondialdehyde contents. Total superoxide dismutase (SOD) activity increased to plateau levels 146% greater than control values. The cells also exhibited increased ascorbate peroxidase (APx) activity (50%) and peridinin content (27%). No changes were observed in β-carotene under these experimental conditions. Therefore, SOD and APx induction and increased peridinin content may be principal primary adaptive responses to an increase of reactive oxygen species in Arochlor 1254 stress as indicated by protein oxidative damage and are an early marker of Arochlor 1254 contamination.
Starting Page	59
Ending Page	65
Page Count	7
File Format	PDF
ISSN	00904341
Journal	Archives of Environmental Contamination and Toxicology
Volume Number	45
Issue Number	1
e-ISSN	14320703
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Pollution Health, Toxicology and Mutagenesis Medicine Toxicology

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