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Related Experiment Videos

Wenjia Liu1,2, Liqiang Zhang1,2, Kun Xuan1

  • 11MS-State Key Laboratory & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, Fourth Military Medical University, Xi'an, China.

Bone Research
|September 14, 2018
PubMed
Summary

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Liver/bone/kidney alkaline phosphatase (Alpl) deficiency causes premature bone aging by disrupting mesenchymal stem cell function via ATP signaling. Metformin treatment reactivates key pathways, preventing bone aging in mice.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Gerontology

Background:

  • Mutations in the liver/bone/kidney alkaline phosphatase (Alpl) gene are linked to hypophosphatasia (HPP) and bone dysplasia.
  • The specific role of Alpl in the complex process of bone aging remains largely uncharacterized.

Purpose of the Study:

  • To elucidate the mechanism by which Alpl influences bone aging.
  • To investigate the potential of therapeutic interventions targeting Alpl-mediated pathways in bone aging.

Main Methods:

  • Ablation of Alpl in mice to study premature bone aging phenotypes.
  • Analysis of mesenchymal stem cell (MSC) senescence, differentiation, and ATP metabolism.
  • Investigating the effects of metformin on AMPKα pathway reactivation and MSC function in Alpl-deficient mice.

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Main Results:

  • Alpl deficiency induced premature bone aging, characterized by bone loss, marrow fat accumulation, and MSC senescence.
  • Alpl deficiency led to enhanced extracellular ATP release and intracellular ATP accumulation, inactivating the AMPKα pathway in MSCs.
  • Metformin treatment reactivated the AMPKα pathway, improved MSC function, and prevented premature bone aging in Alpl+/- mice.

Conclusions:

  • Alpl plays a critical role in regulating MSC stemness and preventing bone aging through the ATP-mediated AMPKα pathway.
  • Alpl deficiency disrupts MSC homeostasis, leading to accelerated bone aging.
  • Metformin represents a potential therapeutic strategy for age-related bone loss by targeting the Alpl-AMPKα axis.