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2015 ; 10
(4
): e0124136
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Inhibition of cancer cell growth by exposure to a specific time-varying
electromagnetic field involves T-type calcium channels
#MMPMID25875081
Buckner CA
; Buckner AL
; Koren SA
; Persinger MA
; Lafrenie RM
PLoS One
2015[]; 10
(4
): e0124136
PMID25875081
show ga
Electromagnetic field (EMF) exposures affect many biological systems. The
reproducibility of these effects is related to the intensity, duration,
frequency, and pattern of the EMF. We have shown that exposure to a specific
time-varying EMF can inhibit the growth of malignant cells. Thomas-EMF is a
low-intensity, frequency-modulated (25-6 Hz) EMF pattern. Daily, 1 h, exposures
to Thomas-EMF inhibited the growth of malignant cell lines including B16-BL6,
MDA-MB-231, MCF-7, and HeLa cells but did not affect the growth of non-malignant
cells. Thomas-EMF also inhibited B16-BL6 cell proliferation in vivo. B16-BL6
cells implanted in syngeneic C57b mice and exposed daily to Thomas-EMF produced
smaller tumours than in sham-treated controls. In vitro studies showed that
exposure of malignant cells to Thomas-EMF for > 15 min promoted Ca(2+) influx
which could be blocked by inhibitors of voltage-gated T-type Ca(2+) channels.
Blocking Ca(2+) uptake also blocked Thomas-EMF-dependent inhibition of cell
proliferation. Exposure to Thomas-EMF delayed cell cycle progression and altered
cyclin expression consistent with the decrease in cell proliferation.
Non-malignant cells did not show any EMF-dependent changes in Ca(2+) influx or
cell growth. These data confirm that exposure to a specific EMF pattern can
affect cellular processes and that exposure to Thomas-EMF may provide a potential
anti-cancer therapy.