Abstract
The possible association of intracellular Ca2+ with metastasis in human cancer cells is poorly understood. We have studied Ca2+ signaling in human prostate and breast cancer cell lines of strongly versus weakly metastatic potential in a comparative approach. Intracellular free Ca2+ was measured using a membrane-permeant fluorescent Ca2+-indicator dye (Fluo-4 AM) and confocal microscopy. Spontaneous Ca2+ oscillations were observed in a proportion of strongly metastatic human prostate and breast cancer cells (PC-3M and MDA-MB-231, respectively). In contrast, no such oscillations were observed in weakly/non metastatic LNCaP and MCF-7 cells, although a rise in the resting Ca2+ level could be induced by applying a high-K+ solution. Various parameters of the oscillations depended on extracellular Ca2+ and voltage-gated Na+ channel activity. Treatment with either tetrodotoxin (a general blocker of voltage-gated Na+ channels) or ranolazine (a blocker of the persistent component of the channel current) suppressed the Ca2+ oscillations. It is concluded that the functional voltage-gated Na+ channel expression in strongly metastatic cancer cells makes a significant contribution to generation of oscillatory intracellular Ca2+ activity. Possible mechanisms and consequences of the Ca2+ oscillations are discussed.
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We would like to acknowledge continued financial support from the Pro Cancer Research Fund (PCRF) in the form of a rolling grant (MBAD, SPF). RO was supported by the British Heart Foundation (BHF).
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MBAD has a patent pending for use of blockers of the persistent component of the voltage-gated sodium channel as anti-cancer agents.
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Special Issue: Ion Channels, Transporters and Cancer.
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Rizaner, N., Onkal, R., Fraser, S.P. et al. Intracellular calcium oscillations in strongly metastatic human breast and prostate cancer cells: control by voltage-gated sodium channel activity. Eur Biophys J 45, 735–748 (2016). https://doi.org/10.1007/s00249-016-1170-x
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DOI: https://doi.org/10.1007/s00249-016-1170-x