Cell-Conditioned Protein Coronas on Engineered Particles Influence Immune Responses.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Immunology

Background:

• Engineered particles acquire a protein corona in biological fluids, influencing their behavior.
• Previous studies used static environments, neglecting the dynamic nature of biological systems.
• Cell-conditioning, involving biomolecule exchange with cells, creates a dynamic extracellular environment.

Purpose of the Study:

• To investigate how protein coronas formed in dynamic, cell-conditioned media affect engineered particle properties.
• To compare these coronas with those formed in static, unconditioned environments.
• To evaluate the impact of different protein coronas on immune cell interactions, including cytokine secretion and apoptosis.

Main Methods:

• Formation of protein coronas on engineered particles using both conditioned and unconditioned cell media.
• Characterization of biophysical particle properties and protein adsorption.
• Co-culture of protein corona-formed particles with immune cells.
• Analysis of pro-inflammatory cytokine secretion and immune cell apoptosis.

Main Results:

• Protein coronas formed in cell-conditioned media exhibit different biophysical properties and protein adsorption compared to those from unconditioned media.
• Particles with coronas from various environments induced distinct immune responses.
• Specific cytokine secretion and immune cell apoptosis were modulated by the protein corona's origin.

Conclusions:

• The environment where a protein corona forms significantly influences its interaction with biological systems.
• Tailoring protein coronas using cell-conditioned media can engineer nanoparticles for specific immune responses.
• This approach holds promise for developing advanced drug carriers with enhanced biocompatibility, prolonged circulation, and reduced toxicity.