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Preparation of Quality Inositol Pyrophosphates
Published on: September 3, 2011
Effects of inositol hexaphosphate on growth and differentiation in K-562 erythroleukemia cell line
A M Shamsuddin1, A Baten, N D Lalwani
1Department of Pathology, University of Maryland School of Medicine, Baltimore 21201.
Abstract:
Inositol hexaphosphate (InsP6) has recently been shown to inhibit experimental cancers in vivo. Since the lower phosphorylated forms of InsP6 are important in cell growth in a wide variety of mammalian cells, we tested the efficacy of InsP6 in growth reduction of K-562 human erythroleukemia cells in vitro. We report that InsP6 decreases the K-562 cell population by 19-36% (P less than 0.001) concomitant to an increased differentiation as evidenced by ultrastructural morphology and increased hemoglobin synthesis. Pilot experiments to study the mechanism of action of InsP6 show that following treatment with InsP6, the concentration of intracellular [Ca2+] ([Ca2+]i) is increased by 57% (P less than 0.02). Likewise, a 41% increase (P less than 0.05) in InsP3 and a 26% decrease (P less than 0.02) in InsP2 were noted 1 h following treatment with InsP6. Contrary to the dogma that cell division is associated with increased [Ca2+]i, our data show that reduced cell growth and enhanced differentiation is associated with increased [Ca2+]i and increased InsP3 in the presence of InsP6.
Insights
Inositol hexaphosphate (InsP6) reduces human erythroleukemia cell growth and promotes differentiation. This cancer cell growth inhibitor increases intracellular calcium and inositol trisphosphate levels, challenging existing cell division theories.
Area of Science:
- Biochemistry
- Cell Biology
- Cancer Research
Background:
- Inositol hexaphosphate (InsP6) demonstrates in vivo anti-cancer properties.
- Lower inositol phosphates are crucial for mammalian cell growth.
Purpose of the Study:
- To investigate the effect of InsP6 on K-562 human erythroleukemia cell growth in vitro.
- To explore the mechanism of InsP6 action on cancer cell proliferation and differentiation.
Main Methods:
- In vitro culture of K-562 human erythroleukemia cells.
- Treatment with Inositol hexaphosphate (InsP6).
- Assessment of cell population, differentiation markers (morphology, hemoglobin synthesis), intracellular calcium ([Ca2+]i), and inositol phosphate levels (InsP3, InsP2).
Main Results:
- InsP6 significantly decreased K-562 cell population by 19-36%.
- InsP6 treatment led to increased cell differentiation, evidenced by morphological changes and enhanced hemoglobin synthesis.
- InsP6 elevated intracellular calcium ([Ca2+]i) by 57% and inositol trisphosphate (InsP3) by 41%, while decreasing inositol bisphosphate (InsP2) by 26%.
Conclusions:
- InsP6 effectively inhibits human erythroleukemia cell growth and induces differentiation in vitro.
- The study suggests a novel mechanism where increased intracellular calcium and InsP3, induced by InsP6, are associated with reduced cell growth and enhanced differentiation, contradicting previous assumptions about calcium's role in cell division.
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