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Updated: May 9, 2025

Use of Human Perivascular Stem Cells for Bone Regeneration
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Engineering fibroblast with reprogramming and spheronization for bone defect repair.

Yanjiao Li1, Bin Jiang2, Zhen Wu3

  • 1Yunnan Key Laboratory for Basic Research on Bone and Joint Diseases, Kunming University, Kunming, Yunnan, 650214, China.

Bioactive Materials
|May 1, 2025
PubMed
Summary

Scientists engineered fibroblasts into functional osteoblasts using small molecules. These induced osteoblasts form spheroids that promote bone healing, offering a promising therapy for bone defects, especially in the elderly.

Keywords:
Elderly autologous induced osteoblastEndogenous revascularization and osteogenesisEngineering fibroblastHigh productivity and survivalSpheroid

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Area of Science:

  • Regenerative Medicine
  • Biomaterials Engineering
  • Cellular Reprogramming

Background:

  • Bone diseases cause significant disability, particularly in the elderly.
  • Osteoblasts are crucial for bone formation, but their function declines with age.
  • Current cell-based therapies for bone defects are limited.

Purpose of the Study:

  • To develop a method for engineering functional osteoblasts from fibroblasts for bone defect repair.
  • To create novel osteoblastic living materials for enhanced bone regeneration.
  • To address age-related dysfunction in osteoblasts for effective clinical application.

Main Methods:

  • Fibroblast reprogramming using small molecules targeting the WNT signaling pathway.
  • Optimization of temporal small molecule regulation for efficient osteoblast induction.
  • Spheronization of induced osteoblasts to create transplantable tissue spheroids (iOB-Sps).

Main Results:

  • Successfully generated healthy induced osteoblasts (iOBs) with functional osteoblastic traits.
  • iOB-Sps demonstrated improved survival, self-bone formation, and reduced oxidative stress in vivo.
  • Accelerated endogenous osteogenesis and angiogenesis in bone defect models.
  • Effective healing of bone defects, particularly in aged models.

Conclusions:

  • Material-free iOB-Sps serve as self-scaffolding biofunctional constructs.
  • This approach offers a promising strategy for clinical autologous bone defect repair.
  • The method is effective across all age groups, including the elderly.