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Mutat Res Genet Toxicol Environ Mutagen. 2014 Jul 15;769:7-12. doi: 10.1016/j.mrgentox.2014.04.009. Epub 2014 Apr 24.

Induction of micronuclei and nuclear abnormalities in tadpoles of the common toad (Rhinella arenarum) treated with the herbicides Liberty® and glufosinate-ammonium.

Author information

1
National Council for Scientific and Technical Research (CONICET), Buenos Aires, Argentina; Faculty of Biochemistry and Biological Sciences, (FBCB-UNL), Ciudad Universitaria, Paraje el Pozo s/n, 3000 Santa Fe, Argentina. Electronic address: lajmanovich@hotmail.com.
2
Faculty of Biochemistry and Biological Sciences, (FBCB-UNL), Ciudad Universitaria, Paraje el Pozo s/n, 3000 Santa Fe, Argentina.
3
National Council for Scientific and Technical Research (CONICET), Buenos Aires, Argentina; Faculty of Biochemistry and Biological Sciences, (FBCB-UNL), Ciudad Universitaria, Paraje el Pozo s/n, 3000 Santa Fe, Argentina.
4
Faculty of Biochemistry and Biological Sciences, (FBCB-UNL), Ciudad Universitaria, Paraje el Pozo s/n, 3000 Santa Fe, Argentina; Institute of Technological Development for the Chemical Industry (INTEC-UNL-CONICET), Güemes 3450, 3000 Santa Fe, Argentina.

Abstract

The assessment of micronucleated erythrocytes (ME) in blood represents a widely used method for the detection of chromosomal damage by chemical agents, such as herbicides that may occur as water contaminants. We investigated the changes in some circulating blood-cell parameters of tadpoles of the common toad (Rhinella arenarum) that were exposed during 48 or 96 h to three sub-lethal concentrations (3.75, 7.5, and 15 mg/L) of a commercial formulation of a glufosinate-ammonium (GLA)-based herbicide (Liberty(®), LY(®)) as well as to the corresponding active ingredient GLA. The frequency of ME and other erythrocyte nuclear abnormalities (ENA, i.e., lobed nuclei, binucleates or segmented nuclei, kidney-shaped nuclei, notched nuclei, and picnotic nuclei) were evaluated and compared with positive (cyclophosphamide, CP, 40 mg/L) and negative (de-chlorinated tap water) controls. The results indicate that the exposure of R. arenarum tadpoles to LY(®) induces a concentration-dependent increase in ME frequency. The ENA frequency at 48 h was also significantly higher than that in the negative control group for all the chemicals assayed (CP, LY(®) and GLA) whereas at 96 h, increases in ENA over the negative control group were found only for CP and GLA (7.5 mg/L). Our study demonstrates that the commercial formulation of a GLA-based herbicide induces micronucleus formation in R. arenarum tadpoles, in contrast to the active ingredient. According to these results, the inert ingredients of the commercial formulation played an important role in the production of genotoxic damage in erythrocytes of amphibian tadpoles.

KEYWORDS:

Active ingredient; Commercial formulation; Erythrocyte nuclear abnormalities; Herbicides; Micronuclei

PMID:
24769302
DOI:
10.1016/j.mrgentox.2014.04.009
[Indexed for MEDLINE]

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