Elucidating the Dependence of Size and Concentration of Gold Nanoparticles in Cellular Uptake

Abstract:

Nanoscale particles of gold nowadays dominate a great deal of attention for biomedical applications. Better knowledge of the nano-bio interface will lead to advanced biomedical tools for diagnostic imaging and therapeutics. In this review, recent progress in the elucidating of how size and concentration of gold nanoparticles (AuNPs) affect cellular uptake will be discussed. Due to its small size, AuNPs can be administered conveniently via intravenous injection. The ability to enter cells is one of the factors that determine the clinical utility of nanoparti¬cles (NPs). The size of AuNPs is one of the limitations in the potential use of gold markers for medical imaging or tracking of harder tumors. Within the size range of 10-100 nm, AuNPs of diameter 50 nm demonstrate the highest uptake. Efficient accumulation of AuNPs into cells also can be achieved at higher concentration. The fewer AuNPs are in the solution, the lesser chance for a receptor to receive gold nanoparticle; “mem¬brane wrapping” time is longer, resulting to lower uptake by the cell. Theoretical models support the size- and concentration-dependent NP-uptake. Endocytosis is one of the major pathways for cellular uptake of NPs. NPs are internalized by cells through endocytosis process and trapped in endosomes, which is then fuse with lysosomes for processing before being transported to the cell periphery for excretion. Exocytosis of NPs is also dependent on the size and concentration of the NPs, however, the trend is different compared to endocytosis process. These findings provide useful information in the design and optimization of the NP-uptake at a single cell level for effective applications in imaging, diagnosis, therapeutics, and targeting.

• Periodical: Materials Science Forum (Volume 756)
• Pages: 205-211
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.756.205
• Online since: May 2013
• Authors: Nur Shafawati binti Rosli, Azhar Abdul Rahman, Azlan Abdul Aziz
• Keywords: AuNPs, Cellular Uptake, Endocytosis

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