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Assaying for Inorganic Polyphosphate in Bacteria
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Inorganic polyphosphate as an energy source in tumorigenesis.

Jerusha Boyineni1, Simone T Sredni2,3, Naira V Margaryan4

  • 1Department of Cancer Biology & Pharmacology, University of Illinois College of Medicine, Peoria, Illinois, USA.

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PubMed
Summary

Cancer cells may use inorganic polyphosphate (polyP) as an energy reserve. This study shows polyP is abundant in cancer cells and vital for their survival, suggesting a new metabolic role.

Keywords:
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Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Cancer cells exhibit high energy demands for proliferation.
  • The precise mechanisms of energy expenditure in cancer remain unclear.
  • Inorganic polyphosphate (polyP) is an energy-rich polymer found in various organisms.

Purpose of the Study:

  • To investigate the potential role of inorganic polyphosphate (polyP) as an energy source in cancer cells.
  • To determine the abundance and utilization of polyP in brain tumor-initiating cells (BTICs).

Main Methods:

  • Quantification of polyP levels in cancer cells under various conditions.
  • Assessment of cancer cell viability and ATP levels following polyP manipulation.
  • Enzymatic hydrolysis of polyP to evaluate its impact on cellular energy stores.

Main Results:

  • PolyP is highly abundant in several cancer cell types, including BTICs.
  • PolyP is consumed during nutrient starvation and its levels decrease with ATP depletion.
  • Enzymatic breakdown of polyP impairs cancer cell viability and reduces ATP levels.

Conclusions:

  • Inorganic polyphosphate (polyP) is likely utilized as a phosphate energy source in cancer cell metabolism.
  • This study provides the first evidence for a role of polyP in cancer cell energy metabolism, analogous to its function in bacteria.