Genotoxicity in Oreochromis niloticus (Cichlidae) induced by Microcystis spp bloom extract containing microcystins

Add time:08/22/2019    Source:sciencedirect.com

Studies of genotoxicity in fish caused by cyanobacterial extracts containing microcystins (MCs) can be useful in determining their carcinogenic risk due to a genotoxic mechanism. An extract of cyanobacterial Microcystis ssp, containing MC-LR and -LA from a bloom collected in a eutrophic lake, showed genotoxicity to Oreochromis niloticus. DNA damage (comet assay) was significantly induced in peripheral erythrocytes with both tested concentrations of 6.90 μg kg−1 bw and 13.80 μg kg−1 bw through intraperitoneal injection (ip). There was no micronucleus induction after ip injection at concentrations of 6.90 μg kg−1 bw and 13.80 μg kg−1 bw. Body exposure resulted in micronucleus induction and DNA damage only at the highest tested concentrations of 103.72 μg L−1. Thus, comet assay and ip injection revealed the highest levels of the genotoxicity of MCs. Apoptosis-necrosis test carried out at concentrations of 6.90 μg kg−1 bw and 13.80 μg kg−1 bw revealed that at low concentrations more apoptosis than necrosis occurred. At higher concentrations more necrosis than apoptosis occurred.

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