Dynamic Cross-Linking, Self-Healing, Antibacterial Hydrogel for Regenerating Irregular Cranial Bone Defects

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Irregular cranial bone defects present significant clinical challenges.
• Injectable hydrogels offer advantages for bone defect repair due to ease of administration and customizable properties.
• Current treatments often struggle with achieving complete and functional bone regeneration.

Purpose of the Study:

• To develop a multifunctional injectable hydrogel for repairing irregular cranial bone defects.
• To investigate the properties and efficacy of a novel hydrogel incorporating specific ions and biomaterials.
• To evaluate the potential of ion therapy in promoting bone regeneration and vascularization.

Main Methods:

• Synthesis of a multifunctional hydrogel (DOCMCHM) using oxidized sodium alginate (OSA)-grafted dopamine (DO), carboxymethyl chitosan (CMCS), calcium ions (Ca2+), nanohydroxyapatite (nHA), and magnesium oxide (MgO).
• Characterization of hydrogel properties including adhesion, self-healing, and antibacterial activity.
• In vitro and in vivo biological evaluations assessing biocompatibility, degradability, cell proliferation, osteogenic marker expression (COL-1, OCN, RUNX2), and vascularization (CD31).

Main Results:

• The DOCMCHM hydrogel demonstrated strong wet tissue adhesion, self-healing capabilities, and antibacterial properties.
• Biological assessments confirmed good biocompatibility, in vivo degradability, and promotion of cell proliferation.
• The hydrogel, particularly with MgO, significantly upregulated osteogenic markers (COL-1, OCN, RUNX2) and promoted new blood vessel formation by upregulating CD31.

Conclusions:

• The developed DOCMCHM hydrogel is a promising injectable material for addressing irregular cranial bone defects.
• The incorporation of specific ions, like MgO, plays a crucial role in enhancing osteogenesis and angiogenesis.
• This study highlights the potential of ion-based hydrogel therapy for effective cranial bone defect repair and regeneration.