8,700 Studies Reviewed. 87.0% Found Biological Effects. The Evidence is Clear.
Shield Your Body
Brain & Nervous System

In vitro developmental neurotoxicity following chronic exposure to 50 Hz extremely low frequency electromagnetic fields (ELF-EMF) in primary rat cortical cultures

Bioeffects Seen

de Groot MW, van Kleef RG, de Groot A, Westerink RH · 2016

Share:

Chronic developmental exposure to 50 Hz ELF-EMF demonstrated only limited neurotoxic potential in primary rat cortical neurons, with effects largely restricted to extremely high field strengths far exceeding residential exposure limits.

Plain English Summary

Summary written for general audiences

This in vitro study exposed primary rat cortical neurons to 50 Hz extremely low-frequency electromagnetic fields (ELF-EMF) at various strengths (0-1000 μT) for 7 days during development. The researchers found that chronic ELF-EMF exposure did not affect cell viability or neuronal activity, produced only modest changes in calcium regulation at extreme field strengths, and showed limited evidence of developmental neurotoxicity even at exposures 10,000 times above background levels.

Why This Matters

This study contributes in vitro mechanistic data relevant to longstanding epidemiological debates about ELF-EMF health effects. The findings suggest that if developmental neurotoxicity occurs in vivo, it is unlikely explained by direct effects on primary neuronal cultures at environmentally relevant exposures.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
de Groot MW, van Kleef RG, de Groot A, Westerink RH (2016). In vitro developmental neurotoxicity following chronic exposure to 50 Hz extremely low frequency electromagnetic fields (ELF-EMF) in primary rat cortical cultures.
Show BibTeX
@article{de_groot_mw_van_kleef_rg_de_groot_a_westerink_rh_ce4347,
  author = {de Groot MW and van Kleef RG and de Groot A and Westerink RH},
  title = {In vitro developmental neurotoxicity following chronic exposure to 50 Hz extremely low frequency electromagnetic fields (ELF-EMF) in primary rat cortical cultures},
  year = {2016},
  doi = {10.1016/j.neuro.2016.10.002},
  
}
DOI: 10.1016/j.neuro.2016.10.002PubMed: 26572663

Quick Questions About This Study

Yes, this study found that 14-day exposure to methylmercury and insecticides altered rat brain cell activity at concentrations 10 times lower than what caused effects in 30-minute exposures, demonstrating chronic exposure reveals effects missed by acute testing.
Chronic exposure to α-cypermethrin, chlorpyrifos, and methylmercury inhibited neuronal firing rates at 0.1 μM concentrations, while endosulfan increased firing rates at 1 μM. These effects occurred at much lower concentrations than acute exposure studies would predict.
Yes, multi-well micro-electrode arrays successfully detected chronic neurotoxic effects by measuring mean spike rates in rat cortical cultures. The researchers found this method could predict chronic exposure effects through rapid acute screening studies.
Methylmercury, chlorpyrifos, and α-cypermethrin showed the strongest effects, all inhibiting neuronal activity at the lowest observed effect concentration of 0.1 μM during 14-day exposure. Endosulfan increased activity rather than inhibiting it.
While chlorpyrifos-oxon and carbaryl caused acute neuronal inhibition at high concentrations (10-100 μM), they showed no significant effects during 14-day chronic exposure, suggesting different mechanisms of toxicity between acute and chronic exposure scenarios.