Nano Archive

Cell uptake, cytoplasmic diffusion and nuclear access of a 6.5 nm diameter dendrimer

Ruenraroengsak, Pakatip and Al-Jamal, Khuloud T. and Hartell, Nicholas and Braeckmans, Kevin and Smedt, Stefaan C. De and Florence, Alexander T. (2007) Cell uptake, cytoplasmic diffusion and nuclear access of a 6.5 nm diameter dendrimer. International Journal of Pharmaceutics, 331 (2). 215 - 219.

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Macromolecular crowding and the presence of organelles in the cytosol present barriers to particle mobility, such that it is unclear how nano-carriers can deliver their active agents to the nucleus. In this work a sixth generation amino terminated polyamide polylysine dendrimer (Gly-Lys63 (NH2)64) (MW 8149, diameter 6.5 nm) which is fluorescent allowed the study of nuclear uptake and mobility in living lung carcinoma (SK/MES-1) and colon adenocarcinoma (Caco-2) cells. The dendrimer is found within 25–45 min of incubation inside the cell nuclei. Living cells were then used to develop a method for the dynamic nuclear uptake study using confocal microscopy. The dynamic uptake of the dendrimer demonstrated here allowed the apparent cytoplasmic diffusion coefficient (D) of the dendrimer to be calculated. Values were found in the range 5.99 × 10−11 cm2 s−1 (SK/MES-1 cells) to 9.82 × 10−11 cm2 s−1 (Caco-2 cells). The difference must reflect variation in the intracellular architecture of the cell types.

Item Type:Article
Additional Information:Selected contributions from the 6th European Workshop on Particulate Systems
Uncontrolled Keywords:Diffusion coefficient; Fluorescent dendrimer; Nuclear uptake; Nano-probe; Cytosol
Subjects:Biomedical Science > Nanomedicine
ID Code:5729
Deposited By:SPI
Deposited On:27 Jul 2009 09:53
Last Modified:27 Jul 2009 09:53

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