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Updated: Jul 29, 2026

Through the Looking Glass: Time-lapse Microscopy and Longitudinal Tracking of Single Cells to Study Anti-cancer Therapeutics
06:00

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Published on: May 14, 2016

G0/G1 arrest and S phase inhibition of human cancer cell lines by inositol hexaphosphate (IP6)

Y M El-Sherbiny1, M C Cox, Z A Ismail

  • 1Department of Clinical Pathology University of Minia School of Medicine, Egypt.

Anticancer Research
|November 29, 2001
PubMed
Abstract

Insights

Inositol hexaphosphate (IP6) significantly reduces cancer cell proliferation by decreasing S-phase and arresting cells in G0/G1. This natural compound disengages cancer cells from active cycling, revealing its anti-neoplastic potential.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Inositol hexaphosphate (IP6) exhibits significant anti-cancer properties in preclinical models.
  • Understanding the mechanisms of IP6's anti-neoplastic effects is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the impact of IP6 on cell cycle progression in human breast (MCF-7, MDA-MB 231) and colon (HT-29) cancer cell lines.
  • To elucidate how IP6 influences cancer cell proliferation at the molecular level.

Main Methods:

  • Dual-parameter flow cytometry was used to measure DNA content and 5-bromo-2-deoxyuridine (BrdU) incorporation.
  • Expression of cell cycle proteins, Ki-67, and proliferating cell nuclear antigen (PCNA) were analyzed in relation to DNA content.

Main Results:

  • IP6 treatment (5 mM, 3 days) significantly decreased S-phase progression (BrdU uptake) in all tested cell lines (p = 0.002).
  • MCF-7 and HT-29 cells accumulated in the G0/G1 phase, while MDA-MB 231 cells showed transient G0/G1 accumulation.
  • IP6 significantly reduced the expression of proliferation markers Ki-67 and PCNA across all cell lines (p < 0.0001).

Conclusions:

  • IP6 effectively controls cancer cell cycle progression by inhibiting S-phase and inducing G0/G1 arrest.
  • The reduction in proliferation markers suggests IP6 disengages cells from active proliferation.
  • Further research into cell cycle regulators could enhance understanding of IP6's anti-cancer mechanisms.

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