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Electromagnetic fields have been reported to cause a variety of biological effects. It has been hypothesized that many of these phenomena are mediated by a primary effect on the concentration of cytosolic free calcium ([Ca2+]i). We investigated the effects of exposure to electromagnetic fields on [Ca2+]i in HL-60 cells using the Ca2(+)-sensitive fluorescent indicator indo-1. Indo-1-loaded cell samples were exposed to a radiofrequency electromagnetic field, a static magnetic field, and a time-varying magnetic field, which were generated by a magnetic resonance imaging (MRI) unit. We found that a 23-min exposure to all three fields, in combination, induced a significant increase in [Ca2+]i of 31 +/- 8 (SE) nM (P less than 0.01, n = 13) from a basal level of 121 +/- 8 nM. Also, cells exposed to only the time-varying magnetic field had a mean [Ca2+]i that was 34 +/- 10 nM (P less than 0.01, n = 11) higher than parallel control samples. Separate exposure to the radio-frequency (6.25 MHz) or static field (0.15 T) had no detectable effects. These results demonstrate that time-varying magnetic fields alter [Ca2+]i and suggest that at least some of the reported biological effects of time-varying magnetic fields may arise from elevation of [Ca2+]i.
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
January 2005,
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference,
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
February 1997,
Biochemical pharmacology,
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
December 1997,
FEBS letters,
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
June 2005,
Biochimica et biophysica acta,
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
September 1998,
FEBS letters,
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
December 1990,
Experimental hematology,
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
March 1992,
Annals of the New York Academy of Sciences,
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
October 2002,
Bioelectromagnetics,
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
May 1990,
Magnetic resonance in medicine,
J J Carson, and
F S Prato, and
D J Drost, and
L D Diesbourg, and
S J Dixon
January 1990,
Critical reviews in biomedical engineering,
