Influence of temperature on growth, development and thyroid metabolism of American bullfrog tadpoles (Lithobates catesbeianus) exposed to the herbicide tebuthiuron.
Environ Toxicol Pharmacol
; 94: 103910, 2022 Aug.
Article
em En
| MEDLINE
| ID: mdl-35718323
ABSTRACT
The influence of temperature (25 and 32 °C) on the negative effects of the herbicide tebuthiuron (TBU, 0, 10, 50 and 200 ng.L-1, 16 days) on thyroid function and metamorphosis of Lithobates catesbeianus tadpoles was evaluated. Metamorphosis was accelerated by TBU exposure at 25 ºC, but delayed at 32 ºC with considerable losses of body mass. T3 and T4 levels were not altered. The highest TBU concentrarion at 25 ºC increased TRâ¯ß and DIO3 transcript levels, which is consistent with development acceleration in tadpoles. At 32 ºC TRâ¯ß transcript levels were lower than the values recorded at 25 ºC, and those tadpoles exposed to the highest TBU concentration presented increased diameter of thyroid follicles compared to controls at same temperature. This study evidences that TBU at environmentally realistic concentrations is able to disrupt thyroidogenesis in bullfrog tadpoles, impairing their development. These effects are influenced by temperature.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Herbicidas
Limite:
Animals
Idioma:
En
Revista:
Environ Toxicol Pharmacol
Ano de publicação:
2022
Tipo de documento:
Article