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Chemically modified mRNA (cmRNA) coatings on titanium implants enhance osteointegration. Fibrinogen coatings optimally deliver BMP2-cmRNA, promoting bone healing and implant success.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Nanotechnology

Background:

  • Osteointegration is crucial for implant success, with biomolecules enhancing bone integration.
  • Chemically modified mRNA (cmRNA) offers a novel therapeutic approach for bone healing.
  • Transcript-activated matrices enable local protein production for osteoinductive potential.

Purpose of the Study:

  • To develop bone morphogenetic protein 2 (BMP2) transcript-activated coatings for titanium (Ti) implants.
  • To evaluate different biomaterial coatings and cmRNA incorporation strategies for Ti implants.
  • To assess the efficacy of cmRNA-based coatings for improving implant osteointegration.

Main Methods:

  • Coating Ti disks with poly-d,l-lactic acid (PDLLA), fibrin, or fibrinogen.
  • Incorporating BMP2-cmRNA into biomaterial coatings.
  • Assaying for transfection efficiency, cmRNA release, cell viability, proliferation, and osteogenic activity in vitro.

Main Results:

  • Biomaterial coatings delayed cmRNA release, significantly improving transfection efficiency.
  • Fibrinogen coatings demonstrated superior transfection efficiency, leading to 24-fold higher expression, delayed peak expression (5 days), and extended duration (7 days).
  • Fibrinogen coatings supported BMP2 production and osteogenesis, with increased alkaline phosphatase activity and mineralization correlating with cmRNA concentration.

Conclusions:

  • Fibrinogen is an optimal material for delivering cmRNA from titanium implant surfaces.
  • cmRNA-based coatings, particularly with fibrinogen, show significant potential for enhancing bone healing and implant integration.
  • This technology offers a promising strategy for developing next-generation orthopedic implants.