A multi-targeting bionanomatrix coating to reduce capsular contracture development on silicone implants.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Medical Device Coatings

Background:

• Capsular contracture is a major complication of silicone implants, driven by excessive foreign body responses and fibrotic tissue formation.
• Key mechanisms include myofibroblast differentiation via the transforming growth factor beta (TGF-β)/p-SMADs pathway and biofilm-induced chronic inflammation.
• Current treatments lack multi-targeted approaches for capsular contracture development.

Purpose of the Study:

• To develop and evaluate a multi-targeting nitric oxide (NO)-releasing bionanomatrix coating for silicone implants.
• The coating aims to mitigate capsular contracture by addressing myofibroblast differentiation, inflammation, and infection.
• To assess the efficacy of the bionanomatrix coating in reducing capsular contracture in a preclinical mouse model.

Main Methods:

• Characterization of the bionanomatrix coating using rheology, SEM, nanoindentation, and NO release kinetics.
• In vitro evaluation of monocyte adhesion and Staphylococcus epidermidis biofilm formation on coated silicone implants.
• Subcutaneous implantation in a mouse model to assess capsular contracture, fibrosis, capsule thickness, and inflammatory markers (TGF-β/SMADs, cytokines).

Main Results:

• The bionanomatrix coating demonstrated mechanical stability, sustained NO release for over a month, and reduced monocyte adhesion and biofilm formation in vitro.
• In vivo studies showed a significant reduction in capsule thickness around bionanomatrix-coated implants.
• Inhibition of TGF-β/p-SMADs signaling led to decreased myofibroblast differentiation and extracellular matrix production, with a shift from M1 to M2 macrophage markers indicating reduced inflammation and promoted healing.

Conclusions:

• The NO-releasing bionanomatrix coating effectively reduces capsular contracture and promotes healing on silicone implants.
• The coating's multi-targeting mechanism inhibits myofibroblast differentiation, fibrotic tissue formation, and inflammation.
• This innovative coating offers a promising strategy to improve outcomes for silicone implant procedures.