A defined copper ion window coordinates multicellular responses for predictive vascular implant design.

Area of Science:

• Biomaterials Science
• Vascular Biology
• Regenerative Medicine

Background:

• Copper ions possess pro-regenerative and antimicrobial properties beneficial for vascular applications.
• Existing research lacks a comprehensive understanding of copper's systemic effects on vascular cells.
• A systems-level approach is needed to elucidate copper's role in orchestrating vascular niche responses.

Purpose of the Study:

• To systematically map copper ion dose-response relationships across key vascular cell types.
• To identify a therapeutic window for copper ions in vascular applications.
• To investigate the influence of delivery timing and cell-cell interactions on copper's regenerative effects.

Main Methods:

• Systematic mapping of copper ion dose-response across five vascular cell types (endothelial cells, smooth muscle cells, macrophages, mesenchymal stem cells, fibroblasts).
• Evaluation of copper delivery timing (post-attachment vs. co-culture seeding) and cell-cell interactions.
• In vivo assessment of a copper-modified implant in a relevant model.

Main Results:

• A core therapeutic window of 5-20 μM copper ions was identified.
• This window promotes endothelial and stem cell activity, maintains smooth muscle cell quiescence, and modulates macrophage viability.
• Copper delivery post-attachment and endothelial-stem cell crosstalk were critical for pro-regenerative outcomes.
• In vivo implantation reduced neointimal thickness, improved endothelial coverage, and decreased inflammation.

Conclusions:

• A systems-level understanding of copper ion effects on vascular cells was established.
• The identified therapeutic window and delivery parameters guide the rational design of vascular implants.
• Copper-modified implants demonstrate efficacy in vivo, validating the in vitro findings for harmonious tissue repair.