Effects of algal extracts (Polysiphonia fucoides) on rainbow trout (Oncorhynchus mykiss): a biomarker approach.
The genotoxicity of algal extracts (Polysiphonia fucoides) was investigated in erythrocytes of rainbow trout (Oncorhynchus mykiss). Trout were exposed to 0.5% of the algal extract for 7 days. Comet assay (alkaline and neutral versions) and Micronucleus test were used to assess DNA damage, and Diffusion Assay to detect apoptotic cells. EROD activities and oxidative stress parameters in rainbow trout liver were also measured. A significant induction of DNA single strand breaks comparable to the ones induced by the in vivo exposure to 20 mg/kg B[a]P was observed at the end of the treatment, while increases of double strand breaks and apoptotic cells were not observed. The absence of activation of antioxidant responses seems to underline a mechanism of action of the genotoxic algal extract which does not involve oxidative stress.
Del Barga
I
I
Department of Human Morphology and Applied Biology, University of Pisa, Pisa, Italy.
Frenzilli
G
G
Scarcelli
V
V
Nigro
M
M
Malmvärn
A
A
Asplund
L
L
Förlin
L
L
Sturve
J
J
D000818:Animals; D017209:Apoptosis; D001564:Benzo(a)pyrene / Q000633:toxicity; D020552:Comet Assay / Q000379:methods; D045424:Complex Mixtures / Q000633:toxicity*; D019363:Cytochrome P-450 CYP1A1 / Q000032:analysis; D004249:DNA Damage; D004912:Erythrocytes / Q000187:drug effects*; D008099:Liver / Q000201:enzymology / Q000378:metabolism; D015162:Micronucleus Tests / Q000379:methods; D017686:Oncorhynchus mykiss / Q000235:genetics* / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects; D000461:Rhodophyta / Q000737:chemistry*
D045424:Complex Mixtures; D001564:Benzo(a)pyrene; D019363:Cytochrome P-450 CYP1A1