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Related Experiment Video

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Whitlockite-Enabled Hydrogel for Craniofacial Bone Regeneration.

Sevda Pouraghaei Sevari1, Jin Koo Kim2, Chider Chen3

  • 1Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, School of Dentistry, University of California, Los Angeles, Los Angeles, California 90095, United States.

ACS Applied Materials & Interfaces
|July 23, 2021
PubMed
Summary

This study developed a novel injectable hydrogel using whitlockite microparticles to enhance bone regeneration in craniofacial defects. The growth-factor-free system effectively promotes osteogenesis and bone repair in animal models.

Keywords:
MAPK pathwayalginate hydrogelbone tissue engineeringhuman gingival mesenchymal stem cellswhitlockite

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Craniofacial Engineering

Background:

  • Growth-factor-free bone regeneration is a significant challenge in craniofacial engineering.
  • Existing materials often lack the necessary properties to effectively direct osteogenesis.
  • Human gingival mesenchymal stem cells (GMSCs) are a potential cell source for bone regeneration.

Purpose of the Study:

  • To engineer an osteogenic niche for growth-factor-free bone regeneration.
  • To evaluate the efficacy of whitlockite microparticles (WHMPs) within an alginate hydrogel for directing GMSC osteogenesis.
  • To assess the potential of this system for craniofacial bone repair.

Main Methods:

  • Engineered an alginate hydrogel incorporating whitlockite microparticles (WHMPs).
  • Assessed GMSC osteogenesis in vitro, comparing WHMPs to hydroxyapatite microparticles (HApMPs).
  • Investigated the effects on the MAPK pathway and osteogenic markers (RUNX2, OCN).
  • Conducted coculture studies with osteoclasts to evaluate anti-resorptive effects.
  • Performed in vivo studies using murine calvarial defect models.

Main Results:

  • WHMPs demonstrated superior osteogenic induction of GMSCs compared to HApMPs in vitro.
  • Alginate-WHMP hydrogels exhibited enhanced elasticity and supported GMSC viability.
  • The hydrogel upregulated the MAPK pathway, promoting osteogenic marker expression.
  • GMSCs in the hydrogel downregulated osteoclast activity, potentially via Mg2+ ions and OPG.
  • In vivo studies showed promoted bone repair in calvarial defects.

Conclusions:

  • Developed a promising injectable, growth-factor-free hydrogel delivery system for craniofacial bone regeneration.
  • The alginate-WHMP hydrogel effectively directs GMSC osteogenesis and promotes bone repair.
  • This system represents a potential therapeutic modality for craniofacial defects.