Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 676, Issue -, Pages 290-297Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2019.04.177
Keywords
PFPiAs; Zebrafish larvae; HPT axis; Thyroid endocrine disruption
Categories
Funding
- National Science Foundation of China [NSFC 21737003, 21577067, 21677081]
- Ministry of Science and Technology of China [2017ZX07301002]
- 111 program of Ministry of Education of China [T2017002]
- Tianjin Municipal Science and Technology Commission [16PTSYJC00020, 17JCYBJC23200]
- Yangtze River scholar program
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Perfluoroalkyl phosphinic acids (PFPiAs, including 6:6, 6:8 and 8:8 PFPiAs) are one kind of emerging perfluoroalkyl substances and usually used as leveling and wetting agents in household cleaning products and pesticide formulations. In this study, zebrafish embryos (6 h post-fertilization [hpf]) were exposed to 6:6, 6:8 and 8:8 PFPiAs individually (0.5, 5 and 50 nM) for 168 hpf. 8:8 PFPiA at 5 and 50 nM reduced the body length, while all treatments of 6:8 and 8:8 PFPiA depressed the heartbeat of the zebrafish larvae. 8:8 PFPiA at 50 nM distinctly enhanced the thyroxine (T4) and triiodothyronine (T3) contents. In a negative feedback mechanism, the three PFPiAs remarkably suppressed the genes responsible for THs regulation (corticotropin-releasing hormone, oh; thyroid stimulating hormone, tsh beta), and 8:8 PFPiA displayed the strongest effect. In addition. 8:8 PFPiA significantly promoted the gene expressions corresponding to THs transport, metabolism and action (transthyretin, ttr; uridine diphosphate glucuronosyltransferase, ugt1ab; deiodinases, dio1 and dio2; thyroid hormone receptors, tr alpha and tr beta). As a result, 8:8 PFPiA displayed the strongest thyroid endocrine disrupting effect and significantly affected the growth of zebrafish larvae among the three PFPiAs in the present study. (C) 2019 Elsevier B.V. All rights reserved.
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