Microenvironment-engineered hydrogels drive osteo-angiogenic coupling to accelerate osteoporotic bone regeneration

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Osteoporotic bone defects present challenges due to poor healing, inflammation, and oxidative stress.
• Current treatments struggle to address the complex pathological microenvironment of these defects.

Purpose of the Study:

• To develop a multifunctional composite hydrogel (SMm) for promoting osteoporotic bone regeneration.
• To investigate the hydrogel's ability to modulate the pathological microenvironment and enhance bone healing.

Main Methods:

• Photo-crosslinked composite hydrogel incorporating Metformin (Met) and magnesium oxide nanoparticles (MgO).
• In vitro assessment of physicochemical properties, biocompatibility, osteogenic/angiogenic capacity, and antioxidant/anti-inflammatory effects.
• In vivo evaluation in an osteoporotic bone defect model using micro-CT analysis.

Main Results:

• SMm hydrogel exhibited favorable physicochemical properties and biocompatibility.
• Controlled release of Mg2+ and Met promoted osteogenic markers (Col 1, Runx-2) and angiogenic factors (VEGF).
• The hydrogel demonstrated significant antioxidant and anti-inflammatory effects, scavenging ROS and suppressing pro-inflammatory cytokines, leading to enhanced bone regeneration in vivo.

Conclusions:

• SMm hydrogel is a promising biomaterial for osteoporotic bone regeneration.
• Synergistic effects of ion therapy and metabolic modulation address pathological barriers in osteoporotic bone defects.
• The developed hydrogel offers a potential therapeutic strategy for improving bone defect repair in osteoporotic patients.