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- W1980888931 abstract "·ivikova K. , J . Dianovsk : Mitotic Index and Cell Proliferation Kinetics as Additional Variables for Assessment of Genotoxic Effect of The Herbicide Modown. Acta Vet. Brno 2000, 69: 45–50. The in vitro effect of the herbicide Modown (with active component bifenox) was tested for the ability to influence cell proliferation of PHA-stimulated bovine peripheral lymphocytes. Mitotic (MI) and proliferation (PI) indices were determined as an alternative for the screening of the cytostatic activity. The herbicide Modown exerted a clear effect on the inhibition of MI and PI over a concentration-tested range of 25 μg/ml to 1000 μg/ml. An expressive proliferation delays was found after the treatment with herbicide at a dose of 250 μg/ml (P < 0.001), while the higher doses of 500 and 1000 μg/ml had caused nearly complete mitotic inhibition in each donor (P < 0.05 and P < 0.001, respectively). A correlation between the PI and MI inhibition refers rather to cytostatic than cytotoxic effects of the herbicide. The results support the possibility of immunosuppression by herbicide exposure. Herbicide Modown, bovine peripheral lymphocytes, cell proliferation, cytostatic effect Nitrodiphenylether herbicides are persistent and lipophilic environmental contaminants may contribute to the impairment of animal health and production. The presence of pesticide residues has been demonstrated in raw bovine milk and in different domestic animal tissues (Lioi et al. 1998). All nitrodiphenylether herbicides exert their phytotoxic activity in chlorophyll of plants by the reduction itself to radical species, which initiate destructive reactions in membrane lipids, leading to the cell leakage (Corbet t et al. 1984). Members, as acifluorfen and oxyfluorfen, e.g. are extremely potent inhibitors of protoporphyrinogen oxidase, a membrane–bound enzyme involved in the heme and chlorophyll biosynthesis pathways (Camadro et al. 1995). The later was studied for the induction of haematological diseases in human erythroid progenitor cells but a cytotoxic effect had been seen only at very high concentrations (Rio et al. 1997). Bifenox is a selective herbicide used in control of annual broad-leaved weeds and some grasses, e. g. in cereals, maize, soya beans, rice and other crops. J inno et al. (1999) described the cytotoxic and porphyrogenic effects of bifenox in rat hepatocytes. They found the maximum porphyrin accumulation at 0.25 mM of the herbicide and an inhibion of protoporphyrogen oxidase, resulting in the accumulation of protoporphyrin IX. Francis et al. (1999) evaluated maternal and developmental toxicity of ten diphenylether herbicides (including bifenox) in mice. They found a correlation among the position of chlorine substituents and the potential for inducing prenatal and postnatal syndroms. But no prenatal and postnatal embryotoxicity was shown. ACTA VET. BRNO 2000, 69: 45–50 Address for correspondence: RNDr. Katarina ·ivikova, CSc. Department of Veterinary Genetics, University of Veterinary Medicine Komenskeho 73, 041 81 Ko‰ice, Slovak Republic Phone: +421 95 63 321 11, (ext. 482) Fax: +421 95 63 236 66 E-mail: sivikova@uvm.sk http://www.vfu.cz/acta-vet/actavet.htm" @default.
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- W1980888931 date "2000-01-01" @default.
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- W1980888931 title "Mitotic Index and Cell Proliferation Kinetics as Additional Variables for Assessment of Genotoxic Effect of The Herbicide Modown" @default.
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- W1980888931 doi "https://doi.org/10.2754/avb200069010045" @default.
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