The Effect of Extremely Low-Frequency Magnetic Fields on the Level of Serotonin Metabolite in the Raphe Nuclei of Adult Male Rat

Abstract

Background: According to several studies, the extremely low-frequency magnetic fields (ELF fields) affect extensively on biological system. These fields can influence the nervous and neurotransmitter system due to the electrical nature of them. The influences in some cases are therapeutic and sometimes are destructive. The purpose of this study was to investigate the effect of extremely low-frequency magnetic fields, with frequency of 10 Hz and intensity of 720 to 540 microtesla, on the level of serotonin metabolite, 5-Hydroxyindoleacetic Acid (5-HIAA), in the raphe nuclei of adult male rat. Methods: Using a magnetic coil, the extremely low-frequency magnetic field, with 690 microtesla strength at the center of the coil, was produced. 6 rats were under this field 3 hours daily for 15 consecutive days. Then, 6 samples were collected from the raphe nucleus of each rat using microdialysis technique. Each sample was 40 microliters in volume. Then, the serotonin metabolite levels in each sample were measured via high-pressure liquid chromatography and compared with its control sample. Findings: Extremely low-frequency magnetic field with mentioned characteristics significantly decreased the level of serotonin metabolite in the raphe nucleus compared to the control group (P < 0.05). Conclusion: It can be concluded that extremely low-frequency magnetic fields affect the serotonergic system and can be used to treat some diseases.

Keywords

• Electromagnetic fields
• Hydroxyindoleacetic acid
• Microdialysis
• High-pressure liquid chromatography
• Raphe nuclei