title: Arsenic impacted the development, thyroid hormone and gene transcription of thyroid hormone receptors in bighead carp larvae (Hypophthalmichthys nobilis).
abstract: Arsenic (As) contamination in aquatic environment adversely impacts aquatic organisms. The present study assessed the toxicity of different As species and concentrations on bighead carp (Hypophthalmichthys nobilis) at early life stage, a major fish in Yangtze River, China. We measured the changes in embryo and larvae survival rate, larvae aberration, concentrations of thyroid hormone thyroxine, and transcription levels of thyroid hormone receptors (TRs) in fish larvae after exposing to arsenite (AsIII) or arsenate (AsV) at 0, 10, 30, 50, 100, or 150 μg L(-1) for 78 h. As concentrations ≤ 150 μg L(-1) had limited effect on embryo survival rate (6-8% inhibition), but larvae survival rate decreased to 53-57% and larvae aberration rate increased to 20-24% after As exposure. Moreover, thyroxine levels elevated by 23% and 50% at 100 μg L(-1) AsIII and 150 μg L(-1) AsV. Besides, AsIII and AsV decreased the transcriptional levels of TRα by 72 and 53%, and TRβ by 91 and 81% at 150 μg L(-1) As. Our data showed that AsIII and AsV had limited effect on carp embryo survival, but they were both toxic to carp larvae, with AsIII showing more effect than AsV. As concentrations <150μg L(-1) adversely influenced the development of bighead carp larvae and disturbed their thyroid hormone homeostasis.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210046, China.
authors.forename: Hong-Jie
authors.initials: HJ
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210046, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Xiang
authors.affiliation: Yangzhou Integrated Experimental Station, National Industry Technology Research System of Staple Freshwater Fish, Jiangsu 225104, China.
authors.forename: Ming-Hu
authors.initials: MH
authors.lastname: Tang
authors.affiliation: Yangzhou Integrated Experimental Station, National Industry Technology Research System of Staple Freshwater Fish, Jiangsu 225104, China.
authors.forename: Li
authors.initials: L
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210046, China; Soil and Water Science Department, University of Florida, Gainesville, FL 32611, USA. Electronic address: lqma@ufl.edu.
authors.forename: Lena Q
authors.initials: LQ
authors.lastname: Ma
mesh_terms: D000818:Animals; D001151:Arsenic / Q000633:toxicity*; D002347:Carps / Q000254:growth & development / Q000378:metabolism*; D004625:Embryo, Nonmammalian; D006128:Growth / Q000187:drug effects*; D007814:Larva / Q000254:growth & development / Q000378:metabolism; D011988:Receptors, Thyroid Hormone / Q000096:biosynthesis*; D013963:Thyroid Hormones / Q000096:biosynthesis*; D014158:Transcription, Genetic / Q000187:drug effects*
chemical_list: D011988:Receptors, Thyroid Hormone; D013963:Thyroid Hormones; D001151:Arsenic
keywords: Arsenate; Arsenite; Bighead carp; Early life stage; Thyroid hormone; Thyroid hormone receptors