Mucin-inspired bottlebrush polymer hydrogel for postoperative adhesion prevention

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Surgical Innovation

Background:

• Postoperative adhesions are a significant clinical problem causing pain, dysfunction, and increased healthcare costs.
• Current adhesion prevention methods often use physical barriers with limitations in adaptability and biocompatibility.
• Natural mucus, with its bottlebrush-structured mucins, provides effective lubrication and hydration, serving as a model for advanced biomaterials.

Purpose of the Study:

• To engineer a mucin-inspired bottlebrush polymer (MIBP) hydrogel that mimics the lubricating and self-healing properties of natural mucus.
• To develop an injectable, adaptable, and biocompatible barrier for preventing postoperative adhesions.
• To evaluate the anti-adhesion efficacy and biosafety of the MIBP hydrogel in a preclinical model.

Main Methods:

• Chemically engineered zwitterionic polysulfobetaine bottlebrush polymers dynamically crosslinked with poly(sodium 4-styrenesulfonate).
• Utilized ionic interactions for rapid, injectable gelation and autonomous self-healing capabilities.
• Assessed antifouling properties, lubricity, solubility, and in vivo performance in a rat sidewall defect-cecum abrasion model.

Main Results:

• The MIBP hydrogel demonstrated rapid gelation, autonomous self-healing, and superior antifouling properties, resisting protein and cell adhesion.
• Bottlebrush architecture enhanced lubricity and solubility compared to linear polymers, mitigating coacervation issues.
• In vivo studies showed significant anti-adhesion efficacy and biosafety, with reduced local inflammation compared to controls.

Conclusions:

• The mucin-inspired bottlebrush polymer hydrogel effectively prevents postoperative adhesions by acting as a dynamic, biocompatible barrier.
• The biomimetic design, leveraging natural mucus principles, offers a highly adaptable and effective strategy for improving surgical outcomes.
• This novel hydrogel represents a significant advance in developing advanced materials for surgical applications.