期刊
NANOTOXICOLOGY
卷 8, 期 5, 页码 521-532出版社
TAYLOR & FRANCIS LTD
DOI: 10.3109/17435390.2013.802821
关键词
antisense; gold nanoparticles; gene silencing; DNA damage; cytotoxicity; proteomics
资金
- Fundacao para a Ciencia e Tecnologia, Ministry of Science and Education (FCT/MEC): CIGMH [PEst-OE/SAU/UI0009/2011]
- REQUIMTE [PEst-C/EQB/LA0006/2011, PTDC/QUI-QUI/112597/2009, PTDC/CTM-NAN/109877/2009, PTDC/BBB-NAN/1812/2012, SFRH/BD/62957/2009, SFRH/BD/64026/2009, SFRH/BPD/72564/2010, SFRH/BD/70202/2010]
- Nanotruck-Action from NanoSciEra+
- Fundação para a Ciência e a Tecnologia [SFRH/BD/62957/2009, SFRH/BD/70202/2010, PEst-OE/SAU/UI0009/2011, PTDC/CTM-NAN/109877/2009, SFRH/BD/64026/2009] Funding Source: FCT
Antisense therapy is a powerful tool for post-transcriptional gene silencing suitable for down-regulating target genes associated to disease. Gold nanoparticles have been described as effective intracellular delivery vehicles for antisense oligonucleotides providing increased protection against nucleases and targeting capability via simple surface modification. We constructed an antisense gold-nanobeacon consisting of a stem-looped oligonucleotide double-labelled with 3'-Cy3 and 5'-Thiol-C6 and tested for the effective blocking of gene expression in colorectal cancer cells. Due to the beacon conformation, gene silencing was directly detected as fluorescence increases with hybridisation to target, which can be used to assess the level of silencing. Moreover, this system was extensively evaluated for the genotoxic, cytotoxic and proteomic effects of gold-nanobeacon exposure to cancer cells. The exposure was evaluated by two-dimensional protein electrophoresis followed by mass spectrometry to perform a proteomic profile and 3-(4,5-Dimethylthiazol- 2-Yl)-2,5-Diphenyltetrazolium Bromide (MTT) assay, glutathione-S-transferase assay, micronucleus test and comet assay to assess the genotoxicity. This integrated toxicology evaluation showed that the proposed nanotheranostics strategy does not exhibit significant toxicity, which is extremely relevant when translating into in vivo systems.
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