X-Ray Visible Protein Scaffolds by Bulk Iodination

Area of Science:

• Biomaterials Science
• Medical Imaging
• Regenerative Medicine

Background:

• Protein-based biomaterials are increasingly used in medicine.
• Current imaging techniques cannot effectively differentiate protein implants from surrounding tissues.
• Visualizing implant placement and behavior in vivo is crucial for therapeutic development.

Purpose of the Study:

• To develop a fast, simple, and translational method for tracking protein-based scaffolds in vivo.
• To enable non-invasive, high-resolution imaging of implanted biomaterials using X-ray computed tomography (CT).

Main Methods:

• Selective iodination of tyrosine residues in protein scaffolds under mild conditions.
• Engineering X-ray visible scaffolds using readily available reagents.
• Testing the technique on a clinically approved hernia repair mesh and various protein formats (collagens, silk sutures).

Main Results:

• The iodination method successfully rendered protein scaffolds visible with X-ray CT.
• Implanted meshes in a mouse model retained X-ray contrast for up to 3 months.
• The labeling process preserved the morphological and mechanical properties of the biomaterials.
• Degradation rates and inflammatory responses remained unchanged after labeling.

Conclusions:

• This X-ray CT-facilitating technique provides a viable solution for visualizing implanted protein-based biomaterials.
• The method is compatible with diverse protein formats, supporting broad applications in surgery and regenerative medicine.
• This approach will accelerate the optimization and safe clinical translation of therapeutic biomaterials by answering key questions about their in vivo performance.