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Related Experiment Video

Updated: Sep 14, 2025

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Improved bone regeneration with bone targeted scaffold.

Hyunjae Kim1, Sungtae Kim1, Hee-Seung Han2

  • 1Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University and Seoul National University Dental Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea.

Scientific Reports
|July 24, 2025
PubMed
Summary
This summary is machine-generated.

This study shows that the PBN scaffold effectively delivers bone morphogenetic protein 2 (BMP-2) and 5-aza-2'-deoxycytidine (5-aza-dC) for enhanced bone regeneration. The PBN scaffold promotes significant bone mineral density increases and tissue formation in beagle models.

Keywords:
3D bioprintingBone morphogenetic proteinBone regenerationDrug delivery systems

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Surgery

Background:

  • Sustained release and bone-specific delivery of bone morphogenetic protein 2 (BMP-2) are critical for effective clinical use.
  • Previous work introduced a bone-targeted, 3D bioprinted scaffold (PBN) for BMP-2 delivery, showing promise in vitro and in vivo.
  • The current study aims to enhance bone regeneration by evaluating the PBN scaffold's efficacy with additional bone-inducing drugs.

Purpose of the Study:

  • To assess the bone-regenerative potential of the PBN scaffold when combined with BMP-2 and 5-aza-2 extquotesingle-deoxycytidine (5-aza-dC) in a beagle mandibular defect model.
  • To evaluate the sustained release and bone tissue-specific localization of therapeutic agents delivered via the PBN scaffold.
  • To determine the optimal combination of PBN scaffold, BMP-2, and 5-aza-dC for facilitating stable and active clinical application in bone regeneration.

Main Methods:

  • A beagle mandibular 3-wall defect model was established after tooth extraction.
  • Four experimental groups were used: control (no scaffold), BMP-2 loaded collagen scaffold, PBN scaffold with BMP-2 and 5-aza-dC, and PBN scaffold with 5-aza-dC.
  • Radiographic (micro-computed tomography) and histological analyses were performed at 4 and 8 weeks post-surgery.

Main Results:

  • The PBN/BMP/5-aza-dC and PBN/5-aza-dC groups demonstrated significant increases in bone volume and mineral density between 4 and 8 weeks post-surgery (p < 0.05).
  • Both the BMP-2 and PBN/BMP/5-aza-dC groups exhibited significantly more mineralized tissue at 4 weeks, with the highest amount observed in the PBN/BMP/5-aza-dC group at 8 weeks.
  • The PBN scaffold facilitated sustained release and bone-tissue specific localization of the loaded therapeutic agents.

Conclusions:

  • The PBN scaffold serves as an effective carrier for bone-inducing drugs, including BMP-2 and 5-aza-dC.
  • The PBN scaffold demonstrates bone-tissue specificity and sustained release capabilities, crucial for enhancing bone regeneration.
  • This approach holds potential for reducing clinical side effects associated with bone regenerative therapies.