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Amorphous Ca²⁺ polyphosphate nanoparticles regulate the ATP level in bone-like SaOS-2 cells.

Werner E G Müller1, Emad Tolba2, Qingling Feng3

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Journal of Cell Science
|April 25, 2015
PubMed
Summary

Polyphosphate (polyP) acts as metabolic fuel for osteoblast-like cells, boosting ATP production and aiding hydroxyapatite formation. This energy release is linked to polyP

Keywords:
ATP levelBone formationPolyphosphateRegenerative medicineSaOS-2 cellsTissue engineering

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biomineralization

Background:

  • Polyphosphate (polyP) is a naturally occurring polyanion synthesized in osteoblasts and platelets.
  • PolyP contains high-energy phosphoanhydride bonds, suggesting a role in cellular energy metabolism.
  • Osteoblast-like cells (SaOS-2) were used to investigate polyP's effects on energy generation and biomineralization.

Purpose of the Study:

  • To investigate the correlation between polyP's morphogenetic effect and cellular energy production.
  • To determine if polyP hydrolysis contributes to ATP generation and hydroxyapatite formation in osteoblasts.

Main Methods:

  • Exposure of SaOS-2 cells to amorphous polyP nanoparticles complexed with Ca(2+).
  • Analysis of mitochondrial accumulation and alkaline phosphatase translocation.
  • Measurement of intracellular and extracellular ATP levels following incubation with polyP and a mineralization cocktail.

Main Results:

  • PolyP exposure led to increased mitochondria and alkaline phosphatase translocation to the cell surface.
  • Combined treatment with polyP and mineralization cocktail caused a tenfold increase in intracellular ATP.
  • An intensified release of ATP into the extracellular space was observed in treated cells.

Conclusions:

  • Polyphosphate serves as a metabolic fuel source for osteoblast-like cells upon hydrolytic cleavage.
  • PolyP hydrolysis contributes to ATP generation, supporting hydroxyapatite formation on osteoblast plasma membranes.
  • PolyP plays a significant role in osteoblast energy metabolism and biomineralization processes.