Enhancing Osseointegration With LNP-Delivered mRNA-Encoded BMP-2: An Experimental In Vivo Study

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Research

Background:

• Osseointegration of titanium implants is crucial for dental and orthopedic applications.
• Bone morphogenetic protein-2 (BMP-2) is a key factor in bone formation, but its clinical use is limited by short half-life and high cost.
• Lipid nanoparticle (LNP)-encapsulated mRNA offers a novel strategy for localized and sustained protein expression.

Purpose of the Study:

• To evaluate the efficacy of BMP-2 mRNA-LNP in enhancing osseointegration and bone regeneration.
• To compare the effects of BMP-2 mRNA-LNP with recombinant human BMP-2 (rhBMP-2) and a control group.

Main Methods:

• A rat femur defect model was used with 48 animals.
• Single doses of BMP-2 mRNA-LNP (5 μg and 15 μg), rhBMP-2 (4 μg), or dPBS were injected.
• Titanium wires were implanted, and bone formation was assessed at 3 and 6 weeks using micro-CT, histology, and immunohistochemistry.

Main Results:

• BMP-2 mRNA-LNP treatment showed a trend towards increased bone formation compared to controls.
• The 15 μg BMP-2 mRNA-LNP group demonstrated significant bone-to-implant contact and bone area at 6 weeks.
• Histological analysis revealed enhanced bone sialoprotein and osteocalcin expression in BMP-2 mRNA-LNP treated groups.

Conclusions:

• BMP-2 mRNA-LNP effectively promotes bone regeneration and osseointegration in a preclinical setting.
• This mRNA-based therapy represents a promising alternative for enhancing bone healing around implants.
• Further research is warranted to explore its clinical applicability in dentistry and orthopedics.