Affiliation:
1. L.I. Medved’s Research Center of Preventive Toxicology, Food and Chemical Safety, Ministry of Health, Ukraine (State Enterprise), Kyiv, Ukraine
Abstract
Aim. Studying the effect of generic pesticides cyproconazole (98 %) and two samples of epoxiconazole (epoxiconazole 1 — 95,75 % and epoxiconazole 2 — 98,7 %) on the reproductive system of male and female Wistar Han rats at the level of the organism when exposed during gametogenesis, identification and characterization of their hazard, as well as assessment of the risk of reproductive toxicity of these compounds. Materials and Methods. The test samples were administered daily (5 days a week) by oral gavage at doses of 0.2 and 2.0 mg/kg for cyproconazole and 0.5 and 2.0 mg/kg for epoxiconazoles during 11 weeks for males, and 10 weeks for females. Also, there were kept intact males and females, intended for crossover mating with experimental animals. After the end of the exposure, functional indicators of the state of the gonads and the ability of animals to reproduce offspring were studied. The duration and the frequency of each stage of the estrous cycle in female rats and the number of motile sperm, the total amount of sperm and the number of abnormal forms of germ cells of the male rats were studied. The reproductive function state in females was evaluated on day 20th of pregnancy. Thereby the number of corpora lutea in the ovaries, number of alive, dead and resorbed foetuses and embryos, the foetus weight, total weight of litters were registered. The studies were carried out in accordance with the recommendations of the Bioethics Commission and the Centre’s standard operating procedures, developed in accordance with the recommendations and requirements of Good Laboratory Practice (GLP).
Conclusions. Test substances at a maximum dose of 2.0 mg/kg of body weight have reproductive toxicity and endocrine-disruptive effect, exerting a significant antiandrogenic effect on males and antiestrogenic effect on female rats. No-observed-adverse-effect-level (NOАEL) for gonadal and reproductive toxicity for male and female Wistar Han rats were established. They are 0.2 mg/kg body weight for cyproconazole and 0.5 mg/kg body weight for epoxiconazole.
Key Words: azole fungicides, cyproconazole, epoxiconazole, reproductive toxicity, antiandrogenic and antiestrogenic effects, Wistar Han rats.
Publisher
L. I. Medved Research Center of Preventive Toxicology, Food and Chemical Safety
Reference27 articles.
1. Popov SYa, Dorozhkina LA, Kalinin VA. Osnovy khimicheskoi zaschity rastenii: ucheb. posobie. M.: Art-Lion; 2003. 190, [1] s.
2. Ragulin V. Fungitsidy — proizvodnye triazola [Internet]. 2011 Okt 24 [tsitirovano 2020 Okt 15]. Dostupno: https://www.agroxxi.ru/stati/ fungicidy-proizvodnye-triazola.html
3. Andreeva EI, Zinchenko VA. Sistemnye fungitsidy — ingibitory biosinteza ergosterina. 2. Tebukonazol, tsiprokonazol, dinikonazol, penkonazol, difenokonazol, fenarimol, triflorin, prokhloraz, imazalil, fenpropimorf, fenpropidin. AgroXXI. 2002;(4):14–5.
4. Zarn JA, Bruschweiler BJ, Schlatter JR. Azole fungicides affect mammalian steroidogenesis by inhibiting sterol 14 alpha-demethylase and aromatase. Environ Health Perspect. 2003 Mar;111(3):255–61. doi: 10.1289/ehp.5785.
5. Institute of Laboratory Animal Resources, Commission on Life Sciences, National Research Council. Guide for the care and use of laboratory animals. Washington, D.C.; [Great Britain]: National Academy Press; 1996. xii, 125 p.
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献