Abstract:
:The toxic effects of thyroxine (T4F), levothyroxine (L-T4), and thyroxine complexed into β-cyclodextrin (β-CD-T4) on the biological parameters of tambaqui (Colossoma macropomum) were evaluated. The animals were exposed to a chronic toxicity test based on concentrations of influent (60 ng/L) for 2 months. Weight, total length, animal behavior, oxygen consumption, photopic electroretinogram (ERG), and the Flicker exam were evaluated. No significant differences were observed (p > 0.05) on the weight and total length measurements between all groups studied. Behavioral observations of the animals exposed to L-T4 and β-CD-T4 complex showed a reduction (p < 0.05) in slow swimming and an increase in staying motionless events. The animals exposed to the β-CD-T4 complex presented the highest O2 consumption. L-T4 and β-CD-T4 promoted a reduction in the ability of the animals to respond to stimuli in the photoreceptors according to the photopic ERG examination. Data from the experimental Flicker exam showed no significant differences (p > 0.05) in all groups studied. It can be concluded that the complexation of T4 into β-CD and L-T4 modified the toxicity of this hormone, promoting changes in the behavior, oxygen consumption, and electrophysiological responses of the exposed animals, suggesting that inclusion complexes should be submitted to new toxicity tests to ensure higher safety.
journal_name
Fish Physiol Biochemjournal_title
Fish physiology and biochemistryauthors
Santos TP,Soares PRL,da Silva MCG,da Silva SCBL,de Andrade ALC,Dos Santos AR,da Silva JF,da Silva Oliveira EG,da Silva Souza EHL,de Sá FB,Cadena MRS,Cadena PGdoi
10.1007/s10695-019-00630-9subject
Has Abstractpub_date
2019-06-01 00:00:00pages
1177-1187issue
3eissn
0920-1742issn
1573-5168pii
10.1007/s10695-019-00630-9journal_volume
45pub_type
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