Nano Archive

Non-covalent interactions of cadmium sulphide and gold nanoparticles with DNA

Atay, Z. and Biver, T. and Corti, A. and Eltugral, N. and Lorenzini, E. and Masini, M. and Paolicchi, A. and Pucci, A. and Ruggeri, G. and Secco, F. and Venturini, M. (2010) Non-covalent interactions of cadmium sulphide and gold nanoparticles with DNA. Journal of Nanoparticle Research, 12 (6). pp. 2241-2253.

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Mercaptoethanol-capped CdS nanoparticles (CdSnp) and monohydroxy-(1-mercaptoundec-11-yl)tetraethylene-glycol-capped Au nanoparticles (Aunp) were synthesised, characterised and their interactions with DNA were investigated. Aunp are stable in different aqueous solvents, whereas CdSnp do precipitate in 0.1 M NaCl and form two different cluster types in 0.1 M NaNO3. As regards the CdSnp/DNA interaction, absorbance and fluorescence titrations, ethidium bromide displacement assays and gel electrophoresis experiments indicate that a non-covalent interaction between DNA and the CdSnp external surface does take place. The binding constant was evaluated to be equal to (2.2 ± 0.5) × 105 M−1. On the contrary, concerning Aunp, no direct interaction with DNA could be observed. Possible interaction with serum albumin was also checked, but no effects could be observed for either CdSnp or Aunp. Finally, short-time exposure of cultured cells to nanoparticles revealed the ability of CdSnp to enter the cells and allocate both in cytosol and nucleus, thus promoting cell proliferation at low concentration (p < 0.005), while longer-time exposure resulted in a significant inhibition of cell growth, accompanied by apoptotic cell death. Aunp neither enter the cells, nor do affect cell proliferation. In conclusion, our data indicate that CdSnp can strongly interact with living cells and nucleic acid while no effects or interactions were observed for Aunp.

Item Type:Article
Uncontrolled Keywords:Gold nanoparticles - CdS nanoparticles - Stability - DNA interaction - Proliferation - Cell culture - Electron microscopy - Tissue - Nanomedicine
Subjects:Biomedical Science > Nanoscale biological processes
Material Science > Nanochemistry
ID Code:9446
Deposited By:SPI
Deposited On:02 Aug 2010 15:22
Last Modified:02 Aug 2010 15:22

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