Estrogenic activity in extracts and exudates of cyanobacteria and green algae.

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Authors

SYCHROVÁ Eliška ŠTĚPÁNKOVÁ Tereza NOVÁKOVÁ Kateřina BLÁHA Luděk GIESY J. P. HILSCHEROVÁ Klára

Year of publication 2012
Type Article in Periodical
Magazine / Source Environment International
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.1016/j.envint.2011.10.004
Field Water pollution and control
Keywords Cyanobacteria; Eutrophication; Endocrine disruption; Estrogenicity; Algae; Phytoplankton
Description Most exudates from cyanobacteria and algae were estrogenic with potencies expressed at 50% of the maximum response under control of the estrogen receptor ranging from 0.2 to 7.2 ng 17 beta-estradiol (E-2) equivalents (EEQ)/L. The greatest estrogenic potency was observed for common species Microcystis aerigunosa. Aqueous extracts of green algae and one species of cyanobacteria (Aphanizomenon gracile) elicited significant estrogenicity with EEQ ranging from 15 to 280 ng 17 beta-estradiol (E-2)/g dry weight. Scenedesmus quadricauda exudates and extracts of Aphanizomenon flos-aquae were antagonistic to the ER when coexposed to E2. The EEQ potency was not correlated with concentrations of cyanotoxins, such as microcystin and cylindrospermopsin, which suggests that the EEQ was comprised of other compounds. The study demonstrates some differences between the estrogenic potency of aqueous extracts prepared from the same species, but of different origin, while the effects of exudates were comparable within species.
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