Collagen targeting using protein-functionalized micelles: the strength of multiple weak interactions

Area of Science:

• Biomaterials Science
• Biochemistry
• Nanotechnology

Background:

• Collagen is a key marker for tissue remodeling and disease.
• Multivalency is crucial for natural collagen interactions.
• Micelles are popular carriers but their multivalent targeting of collagen is underexplored.

Purpose of the Study:

• To explore micelles as multivalent scaffolds for targeting collagen using the CNA35 protein.
• To investigate the impact of multivalent interactions on micelle-collagen binding kinetics and thermodynamics.
• To assess the potential of micelle-based systems for collagen-targeted applications.

Main Methods:

• Preparation of stable micelles with tunable CNA35 protein content (0-20 copies/micelle) using native chemical ligation.
• Thermodynamic and kinetic studies of CNA35 micelle-collagen binding via solid-phase and surface plasmon resonance assays.
• Evaluation of micellar stability and collagen affinity in vitro and ex vivo.

Main Results:

• Micelles with multivalent CNA35 showed remarkable stability and no dissociation from collagen upon washing.
• Significant enhancement in collagen affinity was observed due to multivalent display of CNA35.
• Restored collagen affinity was also seen with liposomes displaying the low-affinity CNA35 variant at high density.

Conclusions:

• Multivalent interactions are critical for effective micelle-based targeting of collagen.
• The study demonstrates the efficacy of combining multiple weak interactions for targeting multivalent extracellular matrix proteins.
• This approach holds promise for applications in drug delivery and molecular imaging targeting collagen.