PUBLICATION

Reproductive effects linked to DNA methylation in male zebrafish chronically exposed to environmentally relevant concentrations of di-(2-ethylhexyl) phthalate

Authors
Ma, Y.B., Jia, P.P., Junaid, M., Yang, L., Lu, C.J., Pei, D.S.
ID
ZDB-PUB-171120-1
Date
2017
Source
Environmental pollution (Barking, Essex : 1987)   237: 1050-1061 (Journal)
Registered Authors
Jia, Panpan, Junaid, Muhammad, Pei, Desheng
Keywords
DNA methylation, Di-(2-ethylhexyl) phthalate, Male zebrafish, Reproduction toxicity
MeSH Terms
  • Animals
  • DNA Methylation*
  • Diethylhexyl Phthalate/toxicity*
  • Endocrine System/drug effects
  • Estradiol/metabolism
  • Fertilization/drug effects
  • Gonadal Steroid Hormones/metabolism
  • Gonads
  • Male
  • Reproduction/drug effects*
  • Spermatogenesis/drug effects
  • Steroid 17-alpha-Hydroxylase/metabolism
  • Testis/drug effects
  • Testosterone/metabolism
  • Toxicity Tests, Chronic
  • Water Pollutants, Chemical/toxicity*
  • Zebrafish/physiology*
PubMed
29150256 Full text @ Environ. Pollut.
Abstract
Di-(2-ethylhexyl) phthalate (DEHP) possesses the potential to interfere with the male reproductive endocrine system in mammals; however, its reproductive toxicity in male zebrafish and associated epigenetic studies have not been explored. In this study, three-month-old male zebrafish were exposed to environmentally relevant concentrations of DEHP (0, 10, 33 and 100 μg/L) for 3 months, and then the impact on the reproduction of males and the underlying mechanism were investigated. Histological testing showed that an exposure concentration of 100 μg/L DEHP significantly inhibited spermatogenesis, with an associated decline in capability to fertilize untreated oocytes. Electron microscopic examinations also revealed noticeable damage to the testicular ultrastructure at the 100 μg/L DEHP exposure level. In addition, exposure to 33 and 100 μg/L of DEHP resulted in a decline of circulating testosterone (T) and an increase in the level of 17β-estradiol (E2), both of which were possibly derived from the downregulation of cyp17a1 and hsd17b3 genes and the upregulation of the cyp19a1a gene in the gonads. The DNA methylation statuses of these genes were altered within their promoter regions. A significant increase in global DNA methylation in both the male testes and their offspring larvae was observed at higher exposure concentration of DEHP. Our findings demonstrate that exposure to environmentally relevant concentrations of DEHP can damage the testes, disturbe the sex hormones production, and inhibite spermatogenesis, which ultimately impairs the reproduction of male zebrafish.
Genes / Markers
Figures
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping