Reproductive toxicity of low level bisphenol A exposures in a two-generation zebrafish assay: Evidence of male-specific effects Public Deposited

http://ir.library.oregonstate.edu/concern/articles/ws859h26s

Supplementry material related to this article found, in the online version, at  http://dx.doi.org/10.1016/j.aquatox.2015.10.020.

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Elsevier and can be found at:  http://www.journals.elsevier.com/aquatic-toxicology/

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  • Bisphenol A (BPA), a high-volume chemical used to make polycarbonate plastic and epoxy resins, is a ubiquitous contaminant in environment and human body. To investigate the reproductive effects of long-term exposure to low concentrations of BPA, a two-generation study was conducted using the aquatic model species of zebrafish. Our findings revealed that exposure to 1 nM (0.228 μg/L) BPA for continuous two generations resulted in female-biased sex ratio in both F1 and F2 adult population, decreased sperm density, and decreased sperm quality as measured by motility, velocity, ATP content and lipid peroxidation in F1 and F2 males. Females were less sensitive to BPA exposures than males as no adverse effects were found in female gonads or gametes. Delayed hatching at 48 hpf and increased malformation and mortality were found in the offspring from BPA exposed F2, but not F1 parents. Most importantly, the adverse effect on larval development and survival from BPA exposed F2 parents was paternal-specific, resulting mainly from BPA exposed males. Subsequent transcription analysis of F2 male gonads revealed dysregulated mitochondrial biogenesis and significant activation of non-canonical Wnt/planar cell polarity and Wnt/Calcium signaling pathways. Gene expression analysis of larvae from BPA exposed F2 parents showed significant reduced expression of DNA methyltransferases such as dnmt1, dnmt3, and dnmt5. In conclusion, low level BPA exposures for continuous two generations not only affects sex ratio and sperm quantity/quality in F1 and F2 adults, reproductive success in offspring from F2 parents, but also perturbs various molecular pathways potentially contributing to these BPA induced male-specific reproductive defects.
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  • Chen, J., Xiao, Y., Gai, Z., Li, R., Zhu, Z., Bai, C., ... & Dong, Q. (2015). Reproductive toxicity of low level bisphenol A exposures in a two-generation zebrafish assay: Evidence of male-specific effects. Aquatic Toxicology, 169, 204-214. doi:10.1016/j.aquatox.2015.10.020
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  • description.provenance : Made available in DSpace on 2016-01-21T16:55:10Z (GMT). No. of bitstreams: 1 TanguayRobertEnvironMoleToxReproductiveToxicityLow.pdf: 1989983 bytes, checksum: f904a22ee76c4a0b24f2fd94c21b8cc4 (MD5) Previous issue date: 2015-12
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2016-01-21T16:54:29Z No. of bitstreams: 1 TanguayRobertEnvironMoleToxReproductiveToxicityLow.pdf: 1989983 bytes, checksum: f904a22ee76c4a0b24f2fd94c21b8cc4 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-01-21T16:55:10Z (GMT) No. of bitstreams: 1 TanguayRobertEnvironMoleToxReproductiveToxicityLow.pdf: 1989983 bytes, checksum: f904a22ee76c4a0b24f2fd94c21b8cc4 (MD5)

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