NDLI: ELF Alternating Magnetic Field Decreases Reproduction by DNA Damage Induction

Content Provider	Springer Nature Link
Author	Panagopoulos, Dimitris J. Karabarbounis, Andreas Lioliousis, Constantis
Copyright Year	2013
Abstract	In the present experiments, the effect of 50-Hz alternating magnetic field on Drosophila melanogaster reproduction was studied. Newly eclosed insects were separated into identical groups of ten males and ten females and exposed to three different intensities of the ELF magnetic field (1, 11, and 21 G) continuously during the first 5 days of their adult lives. The reproductive capacity was assessed by the number of F$_{1}$ pupae according to a well-defined protocol of ours. The magnetic field was found to decrease reproduction by up to 4.3 %. The effect increased with increasing field intensities. The decline in reproductive capacity was found to be due to severe DNA damage (DNA fragmentation) and consequent cell death induction in the reproductive cells as determined by the TUNEL assay applied during early and mid-oogenesis (from germarium to stage 10) where physiological apoptosis does not occur. The increase in DNA damage was more significant than the corresponding decrease in reproductive capacity (up to ~7.5 %). The TUNEL-positive signal denoting DNA fragmentation was observed exclusively at the two most sensitive developmental stages of oogenesis: the early and mid-oogenesis checkpoints (i.e. region 2a/2b of the germarium and stages 7–8 just before the onset of vitellogenesis)—in contrast to exposure to microwave radiation of earlier work of ours in which the DNA fragmentation was induced at all developmental stages of early and mid-oogenesis. Moreover, the TUNEL-positive signal was observed in all three types of egg chamber cells, mainly in the nurse and follicle cells and also in the oocyte, in agreement with the microwave exposure of our earlier works. According to previous reports, cell death induction in the oocyte was observed only in the case of microwave exposure and not after exposure to other stress factors as toxic chemicals or food deprivation. Now it is also observed for the first time after ELF magnetic field exposure. Finally, in contrast to microwave exposure of previous experiments of ours in which the germarium checkpoint was found to be more sensitive than stage 7–8, in the magnetic field exposure of the present experiments the mid-oogenesis checkpoint was found to be more sensitive than the germarium.
Starting Page	703
Ending Page	716
Page Count	14
File Format	PDF
ISSN	10859195
Journal	Cell Biochemistry and Biophysics
Volume Number	67
Issue Number	2
e-ISSN	15590283
Language	English
Publisher	Springer US
Publisher Date	2013-03-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electromagnetic fields (EMFs) Alternating magnetic field Extremely low frequency (ELF) Biological effects Drosophila melanogaster DNA damage Biochemistry Pharmacology/Toxicology Biotechnology Cell Biology Biophysics and Biological Physics
Content Type	Text
Resource Type	Article
Subject	Cell Biology Medicine Biochemistry Biophysics

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