Citation:
SUN Yan-Hong, WEI Jia, WANG Zhen-Xin, MENG Xian-Ying. Study on Interaction of G-rich Oligonucleotides Modified Gold Nanoparticles with Cells[J]. Chinese Journal of Analytical Chemistry,
;2018, 46(9): 1357-1362.
doi:
10.11895/j.issn.0253-3820.181293
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Two kinds of ssDNA-GNPs(PolyG1-GNPs and PolyG2-GNPs) were synthesized by modification of two different G-rich single-strand oligonucleotides(PolyG1 and PolyG2) onto 13-nm gold nanoparticles (GNP) surface through formation of the sulfur-gold covalent bond, respectively. The as-prepared PolyG1-GNPs and PolyG2-GNPs had reasonable colloidal stability in complex dispersing matrices. The effect of ssDNA sequence on the interaction between ssDNA-GNPs and cells was systematically investigated by UV-vis absorption spectroscopy, cellular transmission electronic microscopy and inductively coupled plasma mass spectrometry. The experimental results showed that both of the as-prepared PolyG1-GNPs and PolyG2-GNPs had low cytotoxicity and exhibited energy related endocytosis. In addition, the cellular internalization amount and dispersibility of ssDNA-GNPs were strongly affected by the sequences of immobilized ssDNA. PolyG2 with G4 secondary structure could significantly increase the cellular internalization amount and intracellular stability of PolyG2-GNPs.
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