Cellular Glycocalyx Affects Nanoparticle Access to Cell Membranes and Uptake

Area of Science:

• Biomedical Engineering
• Cell Biology
• Nanotechnology

Background:

• Cellular uptake of nanoparticles is crucial for medical applications.
• The cell surface is coated by a negatively charged layer called the glycocalyx.
• The glycocalyx's influence on nanoparticle uptake is known but not mechanistically understood.

Purpose of the Study:

• To investigate the interaction between the glycocalyx and nanoparticles.
• To elucidate the mechanism by which the glycocalyx affects nanoparticle uptake.
• To explore strategies for enhancing nanoparticle targeting specificity.

Main Methods:

• Studied nanoparticle-cell surface interactions across different cell types.
• Analyzed the effect of nanoparticle charge on interactions with the glycocalyx.
• Quantified cellular access, binding, and uptake of nanoparticles.

Main Results:

• The glycocalyx significantly reduced nanoparticle interactions with cells.
• This reduction in interaction decreased cellular access, binding, and uptake.
• The impact of the glycocalyx was dependent on the nanoparticle's surface charge.

Conclusions:

• The glycocalyx acts as a barrier, hindering nanoparticle uptake.
• Nanoparticle charge is a critical factor in overcoming glycocalyx-mediated repulsion.
• Tailoring nanoparticle charge can improve targeted delivery and cellular interaction.