Silver nanocolloids disrupt medaka embryogenesis through vital gene expressions.

Published

Journal Article

Silver nanomaterials are the major components of healthcare products largely because of their antimicrobial effects. However, their unintended toxicity to biological organisms and its mechanism are not well understood. Using medaka fish embryo model, the toxic effects and corresponding mechanisms of silver nanocolloids (SNC, particle size 3.8 ± 1.0-diameter nm) were investigated. SNC caused morphological changes in embryos including cardiovascular malformations, ischemia, underdeveloped central nervous system and eyes, and kyphosis at exposures of 0.5 mg/L. Interestingly, SNC were observed inside the eggs at a level of 786.1 ± 32.5 pg/mg egg weight, and TEM analysis showed that SNC adhered to the surface and inside of the chorion. Meanwhile, medaka oligo DNA microarray and qRT-PCR were used for gene expression analysis in the embryos exposed to 0.05 mg/L SNC for 48 h. As a result, expressions of six of the oxidative stress-, embryogenesis- and morphogenesis-related genes, ctsL, tpm1, rbp, mt, atp2a1, and hox6b6, were affected by the SNC exposure, and these genes' involvement in those malformations was implied. Thus, SNC could potentially cause malformations in the cardiovascular and central nervous systems in developing medaka embryo through SNC-induced differential expression of the genes related to oxidative stress, embryonic cellular proliferation, and morphological development.

Full Text

Duke Authors

Cited Authors

  • Kashiwada, S; Ariza, ME; Kawaguchi, T; Nakagame, Y; Jayasinghe, BS; Gärtner, K; Nakamura, H; Kagami, Y; Sabo-Attwood, T; Ferguson, PL; Chandler, GT

Published Date

  • June 2012

Published In

Volume / Issue

  • 46 / 11

Start / End Page

  • 6278 - 6287

PubMed ID

  • 22571164

Pubmed Central ID

  • 22571164

Electronic International Standard Serial Number (EISSN)

  • 1520-5851

International Standard Serial Number (ISSN)

  • 0013-936X

Digital Object Identifier (DOI)

  • 10.1021/es2045647

Language

  • eng