Label-free quantitative analysis for studying the interactions between nanoparticles and plasma proteins

Area of Science:

• Biomaterials Science
• Proteomics
• Gene Therapy Delivery

Background:

• Understanding protein interactions with nanomaterials is crucial for developing effective gene-delivery systems.
• The protein corona influences the in vivo behavior and efficacy of nanocarriers.

Purpose of the Study:

• To compare the protein binding capabilities of cationic liposomes, lipoplexes, and lipid-polycation-DNA (LPD) complexes.
• To characterize and quantify the protein corona formed on these different gene-delivery systems.

Main Methods:

• Shotgun proteomics approach using nano-high-performance liquid chromatography and LTQ Orbitrap XL mass spectrometry.
• Label-free quantification via spectral counting and area under curve methods.

Main Results:

• Significant qualitative and quantitative differences in protein binding were observed across the three systems.
• Lipoplexes and LPD complexes exhibited a richer variety of bound proteins compared to cationic liposomes.
• Substantial variations in the quantity of bound proteins were detected.

Conclusions:

• The distinct protein corona profiles suggest differential interactions with biological systems.
• Selective protein binding can be leveraged to engineer gene-delivery systems with improved biodistribution and therapeutic outcomes.
• These findings provide insights for optimizing nanocarrier design for enhanced gene therapy efficacy.