The effects of electromagnetic field exposure were comparatively analyzed in pluripotent embryonic stem cells and embryonic carcinoma cells, including embryonic stem cells deficient for p53, a tumor suppressor protein, to determine the cellular susceptibility to develop spontaneous tumors.
Two GSM modulation schemes (GSM-217 and GSM-Talk), which generate temporal changes between GSM-Basic (active during talking phases) and GSM-DTX (active during listening phases thus simulating a typical conversation), were applied to the cells.
Exposure | Parameters |
---|---|
Exposure 1:
1.71 GHz
Modulation type:
pulsed
Exposure duration:
intermittent, 5/30 min On/Off cycles for 6 or 48 hours
|
|
Exposure 2:
1.71 GHz
Modulation type:
pulsed
Exposure duration:
intermittent, 5/30 min On/Off cycles for 72 hours
|
|
Exposure 3:
1.71 GHz
Modulation type:
pulsed
Exposure duration:
intermittent, 5/30 min On/Off cycles for 22 or 40 hours
|
|
Exposure 4:
1.71 GHz
Modulation type:
pulsed
Exposure duration:
intermittent, 5/30 min On/Off cycles for 6 or 48 hours
|
Frequency | 1.71 GHz |
---|---|
Type | |
Charakteristic |
|
Exposure duration | intermittent, 5/30 min On/Off cycles for 6 or 48 hours |
Exposure source | |
---|---|
Chamber | Four R14 waveguides (two for EMF exposure and two for sham exposure) enclosed in an incubator (5% CO2, 37 °C) were used. |
Setup | Petri dishes (60 mm) were positioned in the H field maximum of a standing wave and exposed in E polarization. |
Additional info | Cells were EMF or sham exposed during differentiation in hanging drops. |
Frequency | 1.71 GHz |
---|---|
Type | |
Charakteristic |
|
Exposure duration | intermittent, 5/30 min On/Off cycles for 72 hours |
Exposure source |
|
---|---|
Additional info | Cells were EMF or sham exposed during cultivation in suspension. |
Frequency | 1.71 GHz |
---|---|
Type | |
Charakteristic |
|
Exposure duration | intermittent, 5/30 min On/Off cycles for 22 or 40 hours |
Exposure source |
|
---|---|
Additional info | Cells were EMF or sham exposed during cultivation in monolayer. |
Frequency | 1.71 GHz |
---|---|
Type | |
Charakteristic |
|
Exposure duration | intermittent, 5/30 min On/Off cycles for 6 or 48 hours |
Modulation type | pulsed |
---|---|
Pulse width | 0.576 ms |
Duty cycle | 12.5 % |
Repetition frequency | 217 Hz |
Pulse type | rectangular |
Additional info |
GSM-Talk signals were applied consisting of 33% GSM-Basic and 67% GSM-DTX (discontinuous transmission mode). GSM-Basic is similar to GSM-217 signal , except that every 26th frame is idle. The frame structure of the DTX signal results in 2, 8 and 217 Hz components. |
Exposure source |
|
---|---|
Additional info | Cells were EMF or sham exposed during differentiation in hanging drops. |
GSM-217 electromagnetic fields (EMF) induced a significant upregulation of mRNA levels of the heat shock protein, hsp70 of p53-deficient embryonic stem cells differentiating in vitro, paralleled by a low and transient increase of c-jun, c-myc, and p21 levels in p53-deficient, but not in wild-type cells. No responses were revealed in either cell type after electromagnetic field exposure to GSM-Talk applied at similar slot-averaged specific absorption rates (SAR), but at lower time-averaged SAR values. Cardiac differentiation and cell cycle characteristics were not affected in embryonic stem and embryonic carcinoma cells after irradiation to GSM-217 EMF signals. The results indicate that the genetic background determines cellular responses to GSM modulated EMF.
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