Cytoplasmic Ca2+ oscillations in human leukemia T-cells are reduced by 50 Hz magnetic fields
J Galvanovskis1, J Sandblom, B Bergqvist
1Department of Medical Biophysics, University of Göteborg, Sweden. galvanov@clavicula.mednet.gu.se
Insights
Exposure to 50 Hz magnetic fields reduces cytosolic calcium oscillations in Jurkat cells. This effect on intracellular calcium (Ca2+) concentration shows a clear dose-response relationship with increasing magnetic field strength.
Area of Science:
- Cellular biology
- Biophysics
- Electromagnetism
Background:
- Cytosolic calcium oscillations are crucial for cell signaling.
- Jurkat E6.1 cells are a human T-cell line commonly used in research.
- Understanding the effects of electromagnetic fields on cellular processes is important.
Purpose of the Study:
- To investigate the impact of 50 Hz alternating magnetic fields on calcium oscillations in Jurkat E6.1 cells.
- To determine if there is a dose-response relationship between magnetic field strength and changes in cytosolic calcium levels.
Main Methods:
- Jurkat E6.1 cells were exposed to varying strengths of 50 Hz magnetic fields (0–0.40 mT RMS).
- Intracellular Ca2+ concentration was measured in single cells exhibiting sustained oscillations.
- Cells were subjected to repeated 10-min exposure and non-exposure intervals.
- Spectral density analysis was used to analyze Ca2+ oscillation patterns.
Main Results:
- Exposure to alternating magnetic fields significantly reduced the total spectral power of cytosolic Ca2+ oscillations.
- This reduction in spectral power demonstrated a clear dose-response relationship with increasing magnetic field strength.
- A similar dose-dependent effect was observed in the 0-10 mHz frequency subinterval of the Ca2+ oscillation spectrum.
- No significant changes were observed in higher frequency subintervals.
Conclusions:
- 50 Hz alternating magnetic fields modulate intracellular calcium dynamics in Jurkat E6.1 cells.
- The observed effect is dependent on the strength of the applied magnetic field.
- These findings suggest a potential mechanism for how electromagnetic fields can influence cellular signaling pathways.
Abstract:
The effect of 50 Hz magnetic fields on the cytosolic calcium oscillator in Jurkat E6.1 cells was investigated for field strengths within the range from 0 to 0.40 mT root mean square. The intracellular Ca2+ concentration data were collected for single Jurkat cells that exhibited a sustained spiking for at least 1 h while repeatedly exposing them to an alternating magnetic field in 10-min intervals interposed with nonexposure intervals of the same length. The obtained data were analysed by computing spectral densities of the Ca2+ oscillating patterns for each of these 10-min intervals. For every single-cell experiment the spectra of all exposure as well as nonexposure periods were then averaged separately. A comparison between the resulting averages showed that the total spectral power of the cytosolic Ca2+ oscillator was reduced by exposure of the cells to an alternating magnetic field and that the effect increased in an explicit dose-response manner. The same relationship was observed within the 0-10 mHz (10 x 10(-3) Hz) subinterval of the Ca2+ oscillation spectrum. For subintervals at higher frequencies, the change caused by the exposure to the magnetic field was not significant.
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