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Pulsed radiofrequency applied to dorsal root ganglia causes a selective increase in ATF3 in small neurons.

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Hamann W, Abou-Sherif S, Thompson S, Hall S. · 2006

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Pulsed radiofrequency caused nerve cell stress at just 42°C, showing RF can affect neurons without obvious heating damage.

Plain English Summary

Summary written for general audiences

Researchers applied pulsed radiofrequency energy to nerve areas in rats and found it triggered a stress response in small pain-sensing neurons, even at temperatures below what would cause obvious tissue damage. The treatment specifically affected the types of nerve cells that carry pain signals (C and A-delta fibers), suggesting radiofrequency can alter nerve function through non-thermal mechanisms. This challenges the assumption that RF energy is only harmful when it heats tissue enough to cause visible damage.

Why This Matters

This study provides important evidence that radiofrequency energy can affect nervous system function through mechanisms beyond simple heating. The researchers found cellular stress markers in pain-sensing neurons at temperatures of just 42°C (107.6°F), well below levels that cause obvious thermal damage. What makes this particularly relevant is that the affected neurons are the same small-diameter fibers responsible for transmitting pain and other sensory information throughout your body. The science demonstrates that RF exposure can trigger biological responses in nerve cells without the dramatic temperature increases that regulatory agencies typically use as safety thresholds. This adds to the growing body of evidence suggesting our current safety standards, which focus primarily on preventing tissue heating, may not adequately protect against all biological effects of radiofrequency exposure.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2 HzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. The study examined exposure from: 2 Hz

Study Details

This is a "proof of concept study" to test the hypothesis that pulsed radiofrequency, PRF, produces cell stress at the primary afferent level without signs of overt thermal damage. We assumed that cell stress would result in impairment of normal function, and used the expression of activating transcription factor 3, ATF3, as an indicator of cellular "stress".

PRF (20 ms of 500-kHz RF pulses, delivered at a rate of 2 Hz; maximum temperature 42 degrees C) was ...

ATF3 expression was upregulated in L4 DRG neuronal cell bodies, irrespective of their size, after ax...

PRF has a biological effect, unlikely to be related to overt thermal damage. It appears to be selective in that it targets the group of neurons whose axons are the small diameter C and Adelta nociceptive fibres.

Cite This Study
Hamann W, Abou-Sherif S, Thompson S, Hall S. (2006). Pulsed radiofrequency applied to dorsal root ganglia causes a selective increase in ATF3 in small neurons. Eur J Pain. 10(2):171-176, 2006.
Show BibTeX
@article{w_2006_pulsed_radiofrequency_applied_to_2144,
  author = {Hamann W and Abou-Sherif S and Thompson S and Hall S.},
  title = {Pulsed radiofrequency applied to dorsal root ganglia causes a selective increase in ATF3 in small neurons.},
  year = {2006},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/16310722/},
}
PubMed: 16310722

Cited By (169 papers)

View all 169 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, research shows pulsed radiofrequency can trigger stress responses in pain-sensing nerve cells even at temperatures too low to cause obvious tissue damage. A 2006 study found RF energy specifically affected small neurons that carry pain signals through non-thermal biological mechanisms.
Research demonstrates pulsed radiofrequency selectively targets small and medium-sized neurons whose fibers carry pain signals (C and A-delta fibers). The 2006 study showed RF energy triggered stress protein production specifically in these pain-sensing nerve cells, not all nerve types.
Studies suggest low frequency pulsed RF can affect nervous system function through non-thermal mechanisms. Research found 2 Hz pulsed radiofrequency caused measurable biological changes in pain-sensing neurons, challenging assumptions that RF is only harmful when it heats tissue significantly.
RF energy can trigger stress responses in specific nerve cell types without causing obvious tissue damage. Research shows pulsed radiofrequency selectively affects small pain-sensing neurons, suggesting potential for nerve function changes through biological mechanisms beyond simple heating effects.
Radiofrequency energy triggers stress protein production in small pain-sensing neurons through non-thermal biological effects. A 2006 study found pulsed RF specifically upregulated ATF3 stress markers in C and A-delta nerve fibers that carry pain signals to the brain.