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Can safe and long-term exposure to extremely low frequency (50 Hz) magnetic fields affect apoptosis, reproduction,
Mehmet Zulkuf Akdag1, Suleyman Dasdag, Ali Kemal Uzunlar
1Department of Biophysics, Medical School of Dicle University , Diyarbakır.
Purpose:
To determine whether 50 Hz extremely low frequency-magnetic fields (ELF-MF) affects apoptotic processes, oxidative damage, and reproductive characteristics such as sperm count and morphology in rat testes.
Materials And Methods:
Thirty male Sprague-Dawley rats were used in the present study, which were divided into three groups (sham group, n = 10, and two experimental groups, n = 10 for each group). Rats in the experimental group were exposed to 100 and 500 μT ELF-MF (2 h/day, 7 days/week, for 10 months) corresponding to exposure levels that are considered safe for humans. The same experimental procedures were applied to the sham group, but the ELF generator was turned off. Tissues from the testes were immunohistochemically stained for active (cleaved) caspase-3 in order to measure the apoptotic index by a semi-quantitative scoring system. The levels of catalase (CAT), malondialdehyde (MDA), myeloperoxidase (MPO), total antioxidative capacity (TAC), total oxidant status (TOS), and oxidative stress index (OSI) were also measured. Additionally, epididymal sperm count and sperm morphology was evaluated.
Results:
There were no significant differences in the reproductive and oxidative stress parameters between the sham group and the exposed groups (p > 0.05). While no difference was observed between the final apoptosis score of the sham and the 100 μT ELF-MF group (p > 0.05), the final apoptosis score was higher in the 500 μT ELF-MF exposure group than in the sham group (p < 0.05).
Conclusion:
Long-term exposure to 100 μT and 500 μT ELF-MF did not affect oxidative or antioxidative processes, lipid peroxidation, or reproductive components such as sperm count and morphology in testes tissue of rats. However, long-term exposure to 500 μT ELF-MF did affect active-caspase-3 activity, which is a well-known apoptotic indicator.
Insights
Long-term exposure to 50 Hz extremely low frequency-magnetic fields (ELF-MF) at 100 and 500 μT did not impact rat sperm or oxidative stress. However, the 500 μT level increased apoptosis indicators.
Area of Science:
- Reproductive toxicology
- Environmental health
- Cellular biology
Background:
- Extremely low frequency-magnetic fields (ELF-MF) are prevalent in modern environments.
- Potential health effects of long-term ELF-MF exposure require investigation, particularly on reproductive health.
- Understanding ELF-MF impact on cellular processes like apoptosis and oxidative stress is crucial.
Purpose of the Study:
- To investigate the effects of 50 Hz ELF-MF on rat testicular apoptosis, oxidative damage, and reproductive parameters.
- To assess the impact of specific ELF-MF exposure levels (100 μT and 500 μT) on sperm count and morphology.
- To determine if ELF-MF exposure affects key oxidative stress markers and apoptotic indicators in testicular tissue.
Main Methods:
- Male Sprague-Dawley rats were exposed to 100 μT and 500 μT of 50 Hz ELF-MF for 10 months.
- Apoptosis was assessed via immunohistochemical staining for active caspase-3.
- Oxidative stress markers (CAT, MDA, MPO, TAC, TOS, OSI) and sperm parameters were evaluated.
Main Results:
- No significant differences in reproductive parameters (sperm count, morphology) or most oxidative stress markers were observed between sham and exposed groups.
- While 100 μT ELF-MF showed no effect on apoptosis, exposure to 500 μT ELF-MF resulted in a significant increase in the final apoptosis score.
- No significant impact on catalase, malondialdehyde, myeloperoxidase, total antioxidative capacity, total oxidant status, or oxidative stress index was found.
Conclusions:
- Long-term exposure to 100 μT and 500 μT ELF-MF does not adversely affect oxidative processes, lipid peroxidation, or sperm characteristics in rats.
- Exposure to 500 μT ELF-MF, but not 100 μT, significantly increased active caspase-3 activity, indicating an apoptotic effect.
- The study suggests that while ELF-MF at these levels may not broadly impair reproductive function or cause oxidative damage, higher intensities can induce specific cellular stress responses like apoptosis.
