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HIF-1α Stabilization Boosts Pulp Regeneration by Modulating Cell Metabolism.

Y Han1, M Koohi-Moghadam1, Q Chen1

  • 1Applied Oral Sciences & Community Dental Care, Faculty of Dentistry, The University of Hong Kong, Pokfulam, Hong Kong.

Journal of Dental Research
|July 7, 2022
PubMed
Summary
This summary is machine-generated.

Hypoxia-inducible factor 1α (HIF-1α) stabilization enhances stem cell survival and promotes dental pulp regeneration. This approach improves vascularization and dentin formation, offering a promising strategy for regenerative dentistry.

Keywords:
cell survivalcellular metabolismdental pulp regenerationdental stem cellhypoxia-inducible factor 1αhypoxic preconditioning

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Area of Science:

  • Regenerative Medicine
  • Stem Cell Biology
  • Biomaterials Science

Background:

  • Dental pulp regeneration faces challenges due to low stem cell survival post-transplantation in ischemic environments.
  • Improving stem cell viability is crucial for successful clinical applications in dental pulp repair.

Purpose of the Study:

  • To enhance the survival and regenerative capacity of stem cells from human exfoliated deciduous teeth (SHED) under hypoxic conditions.
  • To investigate the role of hypoxia-inducible factor 1α (HIF-1α) stabilization in SHED for improved dental pulp regeneration.

Main Methods:

  • SHED were preconditioned to hypoxia via HIF-1α stabilization by knocking down prolyl hydroxylase domain-containing protein 2 (PHD2).
  • HIF-1α-stabilized SHED were encapsulated in hydrogel, injected into tooth fragments, and implanted in mice.
  • Cell viability, DNA damage, apoptosis, vascularization, and tissue formation were assessed in vitro and in vivo.

Main Results:

  • HIF-1α stabilization significantly increased SHED survival, reduced DNA damage, and decreased apoptosis.
  • Enhanced dental pulp-like tissue formation with increased vascularization and dentin-like tissue regeneration was observed.
  • PI3K/AKT pathway activation, upregulation of PDK1, HK2, Glut1, and Smad7 were identified as key mechanisms for HIF-1α-mediated cell survival and regeneration.

Conclusions:

  • HIF-1α stabilization is an effective strategy to improve SHED survival and promote dental pulp regeneration.
  • The study highlights the potential of modulating HIF-1α for enhancing stem cell-based therapies in dentistry.
  • Targeting specific genes and pathways involved in hypoxia adaptation can overcome challenges in regenerative medicine.