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Influence of extremely low frequency magnetic fields on Ca2+ signaling and NMDA receptor functions in rat hippocampus.

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Manikonda PK, Rajendra P, Devendranath D, Gunasekaran B, Channakeshava, Aradhya RS, Sashidhar RB, Subramanyam C. · 2007

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ELF magnetic fields at power line levels disrupted memory-critical brain receptors in developing rats after 90-day exposure.

Plain English Summary

Summary written for general audiences

Researchers exposed young rats to magnetic fields from power lines for 90 days, then examined their brain tissue. The exposure disrupted calcium signaling and reduced NMDA receptor function in the hippocampus, suggesting power line magnetic fields could interfere with learning and memory development.

Why This Matters

This study provides compelling evidence that ELF magnetic fields can disrupt fundamental brain processes at exposure levels you might encounter in everyday life. The magnetic field strengths tested (50 and 100 microtesla) are well within the range found near power lines, electrical panels, and some household appliances. What makes this research particularly significant is its focus on the hippocampus during a critical developmental window. The hippocampus is your brain's memory center, and the NMDA receptors affected in this study are crucial for learning and forming new memories. The disrupted calcium signaling the researchers observed represents a cascade of cellular changes that could have lasting effects on cognitive function. While this was an animal study, the biological mechanisms involved are highly conserved across mammals, making these findings relevant to human health concerns about EMF exposure during childhood development.

Exposure Details

Magnetic Field
0.05, 0.1 mG
Source/Device
50 Hz
Exposure Duration
90 days

Exposure Context

This study used 0.05, 0.1 mG for magnetic fields:

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 0.05, 0.1 mGExtreme Concern - 5 mGFCC Limit - 2,000 mGEffects observed in the No Concern rangeFCC limit is 40,000x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 50 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 50 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

we examined their influence on Ca2+ signaling enzymes in hippocampus and related them with NMDA receptor functions.

Hippocampal regions were obtained from brains of 21-day-old rats that were exposed for 90 days to 50...

In comparison to controls, ELF exposure caused increased intracellular Ca2+ levels concomitant with ...

The combined results suggest that perturbed neuronal functions caused by ELF exposure may involve altered Ca2+ signaling events contributing to aberrant NMDA receptor activities.

Cite This Study
Manikonda PK, Rajendra P, Devendranath D, Gunasekaran B, Channakeshava, Aradhya RS, Sashidhar RB, Subramanyam C. (2007). Influence of extremely low frequency magnetic fields on Ca2+ signaling and NMDA receptor functions in rat hippocampus. Neurosci Lett. 413(2):145-149, 2007.
Show BibTeX
@article{pk_2007_influence_of_extremely_low_682,
  author = {Manikonda PK and Rajendra P and Devendranath D and Gunasekaran B and Channakeshava and Aradhya RS and Sashidhar RB and Subramanyam C.},
  title = {Influence of extremely low frequency magnetic fields on Ca2+ signaling and NMDA receptor functions in rat hippocampus.},
  year = {2007},
  
  url = {https://www.sciencedirect.com/science/article/abs/pii/S0304394006012833},
}

Quick Questions About This Study

Yes, research shows 50 Hz magnetic fields from power lines significantly disrupt calcium signaling in rat hippocampus after 90 days of exposure. The study found increased intracellular calcium levels and altered protein kinase activities, suggesting power line EMF interferes with normal brain cell communication.
Research demonstrates that 90-day exposure to 50 Hz magnetic fields reduces NMDA receptor binding in rat hippocampus. This decrease in NMDA receptor function could potentially impact learning and memory processes, as these receptors are crucial for cognitive development.
A 2007 study found that 90 days of continuous 50 Hz magnetic field exposure significantly altered calcium-dependent protein activities in rat hippocampus. The research suggests chronic exposure over several months may be needed to produce measurable changes in brain chemistry.
Yes, 50 Hz magnetic field exposure increases protein kinase C and cAMP-dependent protein kinase activities while decreasing calcium-calmodulin-dependent protein kinase in hippocampus. These enzyme changes indicate power line EMF disrupts normal cellular signaling pathways critical for brain function.
Research indicates 90-day exposure to 50 Hz magnetic fields causes neuronal dysfunction in hippocampus, the brain's primary learning and memory center. The study found altered calcium signaling and reduced NMDA receptor function, suggesting potential cognitive impacts from chronic power line exposure.