Self-mineralizing Ca-enriched methacrylated gellan gum beads for bone tissue engineering.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Drug Delivery Systems

Background:

• Gellan gum is a versatile polysaccharide with potential in biomedical applications.
• Developing functional hydrogels for bone regeneration and localized drug delivery remains a significant challenge.

Purpose of the Study:

• To develop and characterize calcium-enriched methacrylated gellan gum (GG-MA) hydrogel beads.
• To evaluate their potential for bone tissue engineering through self-mineralization.
• To assess their suitability for drug delivery and biocompatibility.

Main Methods:

• GG-MA hydrogel beads were synthesized and crosslinked with calcium chloride.
• Self-mineralization capacity was assessed by immersion in physiological environments and analyzed using EDS and XRD.
• Drug release studies were conducted with Dextran and Dexamethasone 21-phosphate.
• Biocompatibility was evaluated through in vitro assays (complement activation, macrophage proliferation, cytokine release) and in vivo subcutaneous implantation in mice.

Main Results:

• Calcium-enriched GG-MA beads successfully promoted the formation of a bone-like apatite layer in physiological conditions.
• Encapsulated drugs (Dextran, Dexamethasone 21-phosphate) were efficiently released.
• In vitro and in vivo studies indicated good biocompatibility, with no significant pro-inflammatory response or adverse reactions observed.
• Implanted beads showed complete calcification after 8 weeks.

Conclusions:

• Calcium-enriched GG-MA hydrogel beads are a low-cost, bioactive material with potential for bone regeneration.
• The developed hydrogels are suitable for localized drug delivery applications.
• These dual-functional materials offer a promising strategy for advanced bone tissue engineering.