Multifunctional polyoxomolybdate cluster loaded into hydrogel for augmented bone regeneration through synergistic...

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Immunology

Background:

• Fracture nonunion is a significant orthopedic challenge requiring integrated therapeutic strategies.
• Bone healing involves complex immune, angiogenic, and osteogenic processes.
• Current treatments lack a unified approach to modulate the immune microenvironment and promote bone regeneration.

Purpose of the Study:

• To develop a multifunctional biomaterial for enhanced bone regeneration.
• To investigate a molybdenum-based polyoxometalate cluster (Mo-POM) modified with gallic acid (GA) for immunomodulation and antibacterial activity.
• To create a sustained-release hydrogel scaffold for orthopedic applications.

Main Methods:

• Synthesis of a gallic acid-modified molybdenum-based polyoxometalate cluster (Mo-POM).
• Encapsulation of Mo-POM within a gellan gum/nano-hydroxyapatite (GG/nHA) hydrogel scaffold.
• Evaluation of Mo-POM's ROS scavenging, antibacterial, and osteogenic properties in vitro and in vivo.

Main Results:

• The Mo-POM@GG/nHA system demonstrated significant reactive oxygen species (ROS) scavenging activity, remodeling the immune microenvironment.
• The material exhibited broad-spectrum antibacterial efficacy against bacterial membranes and biofilms.
• Enhanced biomineralization and osteogenic differentiation were observed, promoting bone regeneration.

Conclusions:

• The Mo-POM@GG/nHA system effectively integrates immunomodulation, antibacterial action, and osteogenesis for bone regeneration.
• This multifunctional Mo-POM cluster offers a novel therapeutic strategy for fracture nonunion.
• The study opens new avenues for designing advanced biomaterials in orthopedic applications.