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Mitochondrial Phosphoenolpyruvate Carboxykinase Regulates Osteogenic Differentiation by Modulating

Zheng Li1,2, Xuenan Liu1,2, Yuan Zhu1,2

  • 1Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, People's Republic of China.

Stem Cells (Dayton, Ohio)
|October 2, 2019
PubMed

Insights

Mitochondrial phosphoenolpyruvate carboxykinase (PCK2) positively regulates human mesenchymal stem cell (hMSC) osteogenesis by promoting autophagy via the AMPK/ULK1 pathway. This finding offers potential for bone tissue engineering and metabolic bone disease therapies.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Regenerative Medicine

Background:

  • Mitochondrial phosphoenolpyruvate carboxykinase (PCK2) is crucial for energy metabolism, and its dysfunction causes metabolic disorders.
  • The role of PCK2 in human mesenchymal stem cell (hMSC) osteogenesis remains largely unexplored.
  • PCK2 is a key enzyme in gluconeogenesis and anabolism.

Purpose of the Study:

  • To investigate the novel function of PCK2 in regulating osteogenic differentiation of hMSCs.
  • To elucidate the mechanism by which PCK2 influences hMSC osteogenesis, focusing on its role in autophagy.
  • To explore the potential of PCK2 as a therapeutic target for bone regeneration and metabolic bone diseases.

Main Methods:

  • Utilized hMSCs to study PCK2's role in osteogenesis.
  • Manipulated PCK2 expression (deficiency and overexpression) to assess its impact on autophagy and osteogenic differentiation.
  • Investigated the signaling pathway involved, specifically the AMP-activated protein kinase (AMPK)/unc-51 like autophagy activating kinase 1 (ULK1) axis.
  • Assessed autophagy levels and osteogenic markers in hMSCs under different PCK2 conditions.

Main Results:

  • PCK2 deficiency impaired hMSC osteogenic differentiation and suppressed autophagy.
  • PCK2 overexpression promoted autophagy and enhanced osteogenic differentiation in hMSCs.
  • PCK2 regulates hMSC osteogenesis through an autophagy-dependent pathway mediated by AMPK/ULK1.
  • PCK2 integrates cellular metabolism, autophagy, and bone formation.

Conclusions:

  • PCK2 acts as a positive regulator of osteogenic differentiation in hMSCs.
  • PCK2's function in osteogenesis is mediated by its regulation of autophagy via the AMPK/ULK1 pathway.
  • PCK2 represents a novel target for enhancing stem cell-based bone tissue engineering and treating metabolic bone diseases.
Keywords:
AutophagyMesenchymal stem cellsMitochondrial phosphoenolpyruvate carboxykinaseOsteogenic differentiation

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