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Calmodulin antagonists decrease glucose 1,6-bisphosphate, fructose 1,6-bisphosphate, ATP and viability of melanoma

L Glass-Marmor¹, H Morgenstern, R Beitner

¹Department of Life Sciences, Bar-Ilan University, Ramat Gan, Israel.

European Journal of Pharmacology

|October 17, 1996

Summary

Four calmodulin antagonists reduced key glycolysis molecules and ATP in B16 melanoma cells, leading to decreased cell viability. These findings highlight potential cancer treatments targeting both proliferation and energy production.

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Area of Science:

Biochemistry
Cell Biology
Cancer Research

Background:

Glycolysis is a critical energy pathway for cancer cells.
Calmodulin antagonists are being explored for therapeutic potential.

Purpose of the Study:

To investigate the effects of four calmodulin antagonists on glycolysis in B16 melanoma cells.
To assess the impact on key glycolytic intermediates, ATP levels, and cell viability.

Main Methods:

Treatment of B16 melanoma cells with thioridazine, CGS 9343B, clotrimazole, and bifonazole.
Measurement of glucose 1,6-bisphosphate, fructose 1,6-bisphosphate, and ATP levels.
Assessment of cell viability.

Main Results:

All four calmodulin antagonists significantly decreased glucose 1,6-bisphosphate, fructose 1,6-bisphosphate, and ATP levels.

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The reduction in these molecules occurred in a dose- and time-dependent manner.

Decreased cell viability correlated with reduced ATP levels, preceding cytotoxic effects.

Conclusions:

Calmodulin antagonists inhibit glycolysis by reducing key signal molecules, leading to ATP depletion and cell death.
These compounds show promise for cancer treatment by targeting both cell proliferation and the glycolytic energy supply.