Bio-Inspired Self-Adaptive Nanocomposite Array: From Non-antibiotic Antibacterial Actions to Cell Proliferation

Area of Science:

• Biomaterials Science
• Surface Engineering
• Nanotechnology

Background:

• Biomaterial implants face challenges with pathogenic bacterial infection and poor tissue integration.
• Existing solutions often rely on antibiotics, leading to antimicrobial resistance.
• A single surface solution for both antibacterial properties and cell integration is highly desired.

Purpose of the Study:

• To develop a self-adaptive surface for biomaterial implants.
• To achieve antibiotic-free antibacterial activity and promote native tissue integration.
• To create a surface that transitions from antibacterial action to cell proliferation promotion.

Main Methods:

• In situ assembly of bacteriostatic 3,3'-diaminodipropylamine (DADP)-doped zeolitic imidazolate framework-8 (ZIF-8) on bio-inspired nanopillars.
• Utilized mechano-bactericidal activity of nanopillars and pH-responsive DADP release for initial antibacterial effects.
• Investigated surface transformation after ZIF-8 degradation for cell proliferation promotion.

Main Results:

• The nanocomposite surface demonstrated significant antibacterial effects against severe infections.
• Post-degradation, nanopillars facilitated mammalian cell proliferation due to size differences.
• The surface exhibited excellent histocompatibility and reduced inflammatory response in vivo, avoiding antibiotics.

Conclusions:

• The developed self-adaptive surface offers a promising antibiotic-free strategy for implant-associated challenges.
• This approach effectively combines antibacterial properties with enhanced native tissue integration.
• It presents a viable alternative for medical implants requiring both infection prevention and biocompatibility.