Thyroid endocrine disruption effects of perfluoroalkyl phosphinic acids on zebrafish at early development

• DOI: 10.1016/j.scitotenv.2019.04.177
• Publication Date: 2019-05-03T05:54:01Z
• Authors: Menglin Liu; Shujun Yi; Pengyu Chen; Meng Chen; Wenjue Zhong; Jing Yang; Binbin Sun; Lingyan Zhu
• Keywords: Thyroxine; Animals; Thyrotropin; Triiodothyronine; Endocrine Disruptors; Phosphinic Acids; 01 natural sciences; Water Pollutants, Chemical; Zebrafish; 0105 earth and related environmental sciences; 3. Good health

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, crh; thyroid stimulating hormone, tshβ), 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, trα and trβ). 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.