Size-Dependent Cellular Uptake of DNA Functionalized Gold Nanoparticles

Area of Science:

• Nanomedicine
• Biotechnology
• Materials Science

Background:

• Gold nanoparticles (AuNPs) are vital in nanomedicine for applications like imaging, therapy, and drug delivery.
• Understanding how functionalized AuNPs interact with mammalian cells is crucial for their effective use.
• Factors such as size, shape, charge, and surface functionality influence nanoparticle cellular accumulation.

Purpose of the Study:

• To investigate the differential internalization of DNA-functionalized AuNPs by CaSki cells.
• To determine the impact of nanoparticle size, DNA conformation, and surface charge on cellular uptake.
• To identify key parameters for designing AuNPs with optimized nanomedicine performance.

Main Methods:

• Utilized confocal microscopy, flow cytometry, and inductively coupled plasma mass spectrometry.
• Examined the cellular uptake of AuNPs functionalized with different DNA structures (hairpin, single-stranded, double-stranded).
• Compared the internalization of small versus large DNA-AuNPs in CaSki cells.

Main Results:

• CaSki cells showed varied internalization of AuNPs based on DNA functionalization.
• Nanoparticle surface charge and DNA conformation did not significantly affect cell-nanoparticle interactions.
• Cellular uptake was significantly higher for smaller DNA-AuNPs compared to larger ones.

Conclusions:

• Nanoparticle size is the primary determinant of cellular uptake for DNA-AuNPs.
• DNA-AuNP cellular uptake can be modulated by adjusting nanoparticle size.
• Tailoring AuNP size offers a strategy for enhancing nanomedicine applications through improved cellular delivery.