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Related Experiment Video

Updated: May 4, 2026

Author Spotlight: Enhancing Bone Regeneration with Vascularized Artificial Cartilage Integration
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Injectable gel graft for bone defect repair.

Josephine Fang1, Zhi Yang, ShihJye Tan

  • 1Division of Plastic & Reconstructive Surgery, Department of Surgery, Keck Medical School, University of Southern California, 1333 San Pablo St, BMT 302A, Los Angeles, CA 90089-9112, USA.

Regenerative Medicine
|December 20, 2013
PubMed
Summary

Injectable transglutaminase (Tg)-crosslinked gelatin gel with bone morphogenetic protein-2 (BMP-2) effectively repaired bone defects in animal models. This functional bone graft shows promise for minimally invasive treatment of irregular bone defects.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Surgery

Background:

  • Bone defect repair often requires invasive procedures.
  • Injectable scaffolds offer potential for minimally invasive treatments.
  • Controlling the release of growth factors like bone morphogenetic protein-2 (BMP-2) is crucial for effective bone regeneration.

Purpose of the Study:

  • To evaluate the efficacy of an injectable gel graft, transglutaminase (Tg)-crosslinked gelatin gel with BMP-2 (BMP-2-Tg-Gel), for bone defect repair.
  • To assess the osteoconductivity and controlled release of BMP-2 from the Tg-Gel scaffold in vivo.

Main Methods:

  • BMP-2 was crosslinked with gelatin gel using Tg.
  • Cell studies confirmed the controlled release of BMP-2 via autocrine and paracrine pathways.
  • BMP-2-Tg-Gel was injected into cranial bone defects in rat models.
  • Bone formation was assessed via X-ray imaging and histological evaluation after 14 days.

Main Results:

  • The injectable BMP-2-Tg-Gel demonstrated osteoconductivity in vivo.
  • Controlled BMP-2 activity within the Tg-Gel scaffold successfully induced bone formation.
  • The scaffold facilitated bone regeneration in a rat cranial defect model.

Conclusions:

  • Transglutaminase (Tg)-crosslinked gelatin gel (Tg-Gel) serves as a functional injectable bone graft.
  • This approach supports minimally invasive surgery for irregular bone defects.
  • The technology allows for the incorporation and controlled release of therapeutic agents, advancing tissue regeneration science.