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Sai L.,Shandong University | Sai L.,Shandong Academy of Occupational Health and Occupational Medicine | Wu Q.,Shandong University | Qu B.,China Shandong Medical College | And 8 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2014

Atrazine (AZ), a widely used herbicide has drawn attentions for its potential impacts on amphibians. This study aims to investigate the toxicity of AZ in Bufo bufo gargarizans Cantor (B. bufo gargarizans), a species of toad commonly found in China and countries in East Asia. We treated tadpoles with 0.1, 1, 10 and 100 μg/L AZ for 85 days and examined related parameters. The results showed that the mortality of the toads in the treatment group increased dramatically in a U-shaped dose–response relationship. The hindlimb extension and metamorphosis rate of the toads were significantly inhibited by AZ at 10 and 100 μg/L. Under the same condition, there were significant progressive changes in the testicular structures. Moreover, we found that AZ has no significant effects on growth, sex ratios, gonadal morphology, forelimb emergence and histology in the ovaries. Our results support the idea that environmental contaminants including AZ may be relevant to global amphibian decline. © 2014 Springer Science+Business Media New York Source


Sai L.,Shandong University | Sai L.,Shandong Academy of Occupational Health and Occupational Medicine | Liu Y.,Weihai Wendeng Center Hospital | Qu B.,China Shandong Medical College | And 9 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2015

Abstract Simazine was investigated for gene expression concurrent with simazine-induced phenotype changes during development of male Xenopus laevis. X. laevis tadpoles (Nieuwkoop-Faber stage 46) were exposed to 0.1, 1.2, 11.0 and 100.9 μg/L simazine for 100 days. The results showed that an increased mortality of X. laevis, decreased gonad weight and altered gonadosomatic index of males significantly (p < 0.05) when exposed to simazine at 11.0 and 100.9 μg/L. Significant degeneration in testicular tissues was observed when tadpoles were exposed to simazine at 100.9 μg/L. To investigate the molecular mechanisms behind the testicular degeneration by simazine, we evaluated gene expression in animals treated with 100.9 μg/L simazine and found that 1,315 genes were significantly altered (454 upregulated, 861 downregulated). Genes involved in the cell cycle control, and amino acid metabolism pathways were significantly downregulated. These results indicate that simazine affects the related gene expressions which may be helpful for the understanding of the reason for the reproductive toxicity of simazine on male X. laevis. © 2015 Springer Science+Business Media New York. Source


Sai L.,Shandong University | Sai L.,Shandong Academy of Occupational Health and Occupational Medicine | Wu Q.,Shandong University | Qu B.,China Shandong Medical College | And 8 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2015

Atrazine (AZ), a widely used herbicide has drawn attentions for its potential impacts on amphibians. This study aims to investigate the toxicity of AZ in Bufo bufo gargarizans Cantor (B. bufo gargarizans), a species of toad commonly found in China and countries in East Asia. We treated tadpoles with 0.1, 1, 10 and 100 μg/L AZ for 85 days and examined related parameters. The results showed that the mortality of the toads in the treatment group increased dramatically in a U-shaped dose-response relationship. The hindlimb extension and metamorphosis rate of the toads were significantly inhibited by AZ at 10 and 100 μg/L. Under the same condition, there were significant progressive changes in the testicular structures. Moreover, we found that AZ has no significant effects on growth, sex ratios, gonadal morphology, forelimb emergence and histology in the ovaries. Our results support the idea that environmental contaminants including AZ may be relevant to global amphibian decline. © Springer Science+Business Media New York 2014. Source

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