Corona Composition Can Affect the Mechanisms Cells Use to Internalize Nanoparticles

Area of Science:

• Nanomedicine
• Biomaterials Science
• Cell Biology

Background:

• Nanoparticles in biological environments adsorb biomolecules, forming a surface 'corona'.
• This protein corona influences nanoparticle interactions with cells and organisms.
• The impact of corona composition on nanoparticle cellular entry mechanisms remains unclear.

Purpose of the Study:

• To investigate if nanoparticle corona composition affects cellular uptake mechanisms.
• To characterize nanoparticle internalization pathways influenced by different corona formations.
• To determine the role of specific receptors, like the LDL receptor, in corona-mediated uptake.

Main Methods:

• Formation of distinct coronas on silica nanoparticles using varying serum concentrations.
• Comparison of nanoparticle uptake efficiency and mechanisms in HeLa cells.
• Utilized transport inhibitors and RNA interference for mechanistic characterization.
• Extended studies to A549 cells, primary HUVEC, liposomes, and larger silica nanoparticles.

Main Results:

• Different coronas induced distinct cellular internalization mechanisms for nanoparticles.
• Uptake was mediated by the LDL receptor under specific corona conditions.
• Findings were consistent across different cell types and nanoparticle formulations.

Conclusions:

• Nanoparticle corona composition significantly influences cellular uptake pathways.
• Varied corona composition leads to differential recognition by cell receptors.
• Understanding corona-cell interactions is crucial for designing effective nanomedicines.