Effects of magnetic fields on many functions of human and other mammalian cells and proposal of guidelines and Standard for Human Health

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1. Exposure to the time-varying 1.5 T magnetic field did not affect Ca^<2+> influx across plasma membrane of bovine adrenal chromaffin cells, but strongly inhibited Ca^<2+> release from intracellular Ca^<2+> stores induced by addition of variety of neurotransmitters. Ca^<2+> release from Ca^<2+> stores via ryanodine receptor also suppressed by the exposure.2. Exposure to the strong magnetic field strongly suppressed Ca^<2+> release from intracellular Ca^<2+> stores of pheochromocytoma cells (PC12 cells) by addition of caffeine or ATP.3. Addition of nerve growth factor (NGF) induced a neurite outgrowth of PC12 cells. In the presence of NGF, exposure to an extremely low frequency (ELF) magnetic field stimulate the differentiation.4. We measured the effects of ELF magnetic field on membrane structure of HeLa cells studied by Fourier transform infrared (FT-IR) spectroscopy. This exposure shifted the peak absorbance of the amide I band to a smaller wave number, reduced the peak absorbance of the amide II band, and increase absorbance at around 1600 cm^<-1>. These results suggest that the ELF field exposure has reversible effects on the N-H inplane bending and C-N stretching vibrations of peptide linkages, the changes the secondary structures of alpha-helix and beta-sheet in cell membrane proteins. We found similar changes in FT-IR spectra between cells exposed to ELF field and those incubated in an acidic medium, but these changes were different from those incubated in an high K^+ medium.