Immune-instructive copolymer scaffolds using plant-derived nanoparticles to promote bone regeneration

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Immunology

Background:

• Aging leads to chronic inflammation, impairing bone healing and complicating the repair of critical-sized bone defects in elderly patients.
• Current treatments face challenges due to age-related immune dysregulation affecting bone regeneration.

Purpose of the Study:

• To investigate the anti-inflammatory and osteogenic potential of Poly(L-lactide-co-ɛ-caprolactone) (PLCA) scaffolds functionalized with plant-derived rhamnogalacturonan-I (RG-I) nanoparticles.
• To evaluate the efficacy of these modified scaffolds in modulating immune responses and promoting bone regeneration in aged rodents.

Main Methods:

• PLCA scaffolds were functionalized with potato-derived RG-I nanoparticles (PA).
• In vitro studies assessed inflammatory modulation in neutrophils and macrophages.
• In vivo studies evaluated host response in a subcutaneous rat model and bone regeneration in aged rats with critical-sized calvaria defects.

Main Results:

• PA-functionalized PLCA scaffolds significantly reduced inflammatory markers (e.g., galectin-3) in vitro.
• In vivo, these scaffolds modulated host response towards an anti-inflammatory/healing profile, reducing foreign body reactions.
• PA-functionalized PLCA scaffolds promoted osteogenic markers and initiated bone formation in aged rats' calvaria defects.

Conclusions:

• PLCA scaffolds functionalized with plant-derived RG-I (PA) effectively modulate inflammatory responses and promote osteogenesis.
• These findings highlight the potential of immunomodulatory biomaterials for enhancing bone repair in aged individuals.
• The study addresses the need for advanced 3D scaffolds in bone tissue engineering for improved patient outcomes.