Ultrasmall gold nanoparticles as carriers for nucleus-based gene therapy due to size-dependent nuclear entry.
ACS Nano
; 8(6): 5852-62, 2014 Jun 24.
Article
em En
| MEDLINE
| ID: mdl-24824865
ABSTRACT
The aim of this study was to determine the size-dependent penetration ability of gold nanoparticles and the potential application of ultrasmall gold nanoparticles for intranucleus delivery and therapy. We synthesized gold nanoparticles with diameters of 2, 6, 10, and 16 nm and compared their intracellular distribution in MCF-7 breast cancer cells. Nanoparticles smaller than 10 nm (2 and 6 nm) could enter the nucleus, whereas larger ones (10 and 16 nm) were found only in the cytoplasm. We then investigated the possibility of using ultrasmall 2 nm nanoparticles as carriers for nuclear delivery of a triplex-forming oligonucleotide (TFO) that binds to the c-myc promoter. Compared to free TFO, the nanoparticle-conjugated TFO was more effective at reducing c-myc RNA and c-myc protein, which resulted in reduced cell viability. Our result demonstrated that the entry of gold nanoparticles into the cell nucleus is critically dependent on the size of the nanoparticles. We developed a strategy for regulating gene expression, by directly delivering TFOs into the nucleus using ultrasmall gold nanoparticles. More importantly, guidelines were provided to choose appropriate nanocarriers for different biomedical purposes.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Neoplasias da Mama
/
Terapia Genética
/
Núcleo Celular
/
Nanotecnologia
/
Nanopartículas Metálicas
/
Ouro
Tipo de estudo:
Guideline
Limite:
Female
/
Humans
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article