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@article{704309,
author = {Burýšková, Blanka and Hilscherová, Klára and Babica, Pavel and Vršková, Dagmar and Maršálek, Blahoslav and Bláha, Luděk},
article_location = {Netherlands},
article_number = {4},
keywords = {FETAX;Xenopus laevis;malformations;cyanobacterial fractions;biomarkers},
language = {eng},
issn = {0166-445X},
journal = {AQUATIC TOXICOLOGY},
title = {Toxicity of complex cyanobacterial samples and their fractions in Xenopus laevis embryos and the role of microcystins},
volume = {80},
year = {2006}
}
TY - JOUR
ID - 704309
AU - Burýšková, Blanka - Hilscherová, Klára - Babica, Pavel - Vršková, Dagmar - Maršálek, Blahoslav - Bláha, Luděk
PY - 2006
TI - Toxicity of complex cyanobacterial samples and their fractions in Xenopus laevis embryos and the role of microcystins
JF - AQUATIC TOXICOLOGY
VL - 80
IS - 4
SP - 346-354
EP - 346-354
PB - ELSEVIER SCIENCE BV
SN - 0166445X
KW - FETAX;Xenopus laevis;malformations;cyanobacterial fractions;biomarkers
N2 - The object of this work was to evaluate the effects of various cyanobacterial fractions in Frog Embryo Teratogenesis Assay Xenopus (FETAX) with African clawed frog embryos. Fractions were prepared from five biomasses with different dominant genera (Microcystis, Aphanizomenon, Anabaena, Planktothrix) and different microcystin content. Effects of following fractions were investigated: (I) homogenate of complex cyanobacterial biomass, (II) cell debris (pellet) after centrifugation of complex biomass, (III) supernatant after centrifugation of complex biomass (= crude aqueous extract), (IV) permeate after passing of crude extract through C-18 column (fraction devoid of microcystins), (V) eluate from C-18 column (containing microcysins, if present). Besides classical parameters evaluated in 96 h FETAX (mortality, growth inhibition, malformations), we have also assessed the effects on biochemical markers of oxidative stress and detoxification (glutathione pool, GSH; activity of glutathione peroxidase, GPx, and glutathione reductase, GR, activity of glutathione S-transferase, GST). Complex biomass (I) and aqueous extract (III) were generally the most toxic fractions in terms of mortality and growth inhibition, whereas eluates containing microcystins (V) were generally less toxic. Ont he other hand, the same fraction (eluates) induced significant malformations in low concentrations but the effects were not related to the content of microcystins. Biomarkers were affected in variable manner but no significant effect or clear relation to microcystin content was observed. Our data support the hypothesis that microcystins are not the only or major toxic compounds in the complex cyanobacterial samples and that more attention should be paid to other components of complex cyanobacterial biomass including non-specific parameters such as oxygen content or toxic ammonia released during bacterial decay of organic material.
ER -
BURÝŠKOVÁ, Blanka, Klára HILSCHEROVÁ, Pavel BABICA, Dagmar VRŠKOVÁ, Blahoslav MARŠÁLEK and Luděk BLÁHA. Toxicity of complex cyanobacterial samples and their fractions in Xenopus laevis embryos and the role of microcystins. \textit{AQUATIC TOXICOLOGY}. Netherlands: ELSEVIER SCIENCE BV, 2006, vol.~80, No~4, p.~346-354. ISSN~0166-445X.
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