The effect on rat peripheral nerve morphology and function of a 900-MHz electromagnetic field applied in the prenatal period
Abstract
Category: Neuroscience Tags: EMF, prenatal exposure, peripheral nerve, rat model, nerve morphology, nerve conduction, developmental neurotoxicity DOI: 10.1080/15368378.2025.2479517 URL: doi.org Overview This study investigates the effects of a 900 megahertz (MHz) electromagnetic field (EMF) applied during the prenatal period on rat peripheral nerve morphology, nerve conduction velocity, and locomotor activity. Nine pregnant Sprague Dawley rats were assigned to three groups: - Control group: No procedure was applied. - Sham group: Placed in an EMF cage for 1 hour daily but not exposed to EMF. - EMF group: Exposed to 900 MHz EMF for 1 hour daily throughout pregnancy (days 1-21). No further procedures were done on the offspring until postnatal (PN) day 21. Subsequent groups were formed for assessment, and all groups underwent open field and rotarod tests on PN days 21 and 60, followed by electrophysiological studies. Findings - Sciatic nerves from animals sacrificed on PN day 60 were analyzed using histopathological, histomorphometric, immunohistochemical, and biochemical techniques. - Results demonstrated that prenatal 900 MHz EMF exposure adversely affected rat peripheral nerve development. - These morphological effects persisted into adulthood and were detectible in the sciatic nerve structure. - However, these changes were not severe enough to significantly impact functional outcomes related to the sciatic nerve, according to the measurements used. Conclusion The study underscores a connection between prenatal EMF exposure and rat peripheral nerve morphological alterations, which persist long-term even if not profoundly affecting function. Context is provided on the increasing prevalence of EMF-emitting devices such as cell phones, including during standby mode, and the vital importance of understanding potential nerve-related risks—especially regarding Schwann cell function and nerve development. The findings strongly support the need for further research into the long-term impacts of EMF exposure, especially during crucial developmental periods.
AI evidence extraction
Main findings
The study reports that prenatal 900 MHz EMF exposure adversely affected peripheral nerve development, with morphological alterations detectable in the sciatic nerve at postnatal day 60. The authors report these morphological changes persisted into adulthood but were not severe enough to significantly impact measured functional outcomes related to the sciatic nerve.
Outcomes measured
- Peripheral nerve morphology (sciatic nerve histopathology/histomorphometry/immunohistochemistry/biochemistry)
- Nerve conduction velocity (electrophysiological studies)
- Locomotor activity (open field test)
- Motor coordination/balance (rotarod test)
Limitations
- Animal model; findings may not generalize to humans
- Exposure metric details (e.g., SAR) not reported in the abstract
- Functional outcomes may not capture subtle deficits; abstract notes no significant functional impact despite morphological changes
- Sample size is small (nine pregnant rats)
View raw extracted JSON
{
"publication_year": 2025,
"study_type": "animal",
"exposure": {
"band": "RF",
"source": null,
"frequency_mhz": 900,
"sar_wkg": null,
"duration": "1 hour daily throughout pregnancy (gestational days 1–21)"
},
"population": "Pregnant Sprague Dawley rats and offspring (sciatic nerve assessed postnatally)",
"sample_size": 9,
"outcomes": [
"Peripheral nerve morphology (sciatic nerve histopathology/histomorphometry/immunohistochemistry/biochemistry)",
"Nerve conduction velocity (electrophysiological studies)",
"Locomotor activity (open field test)",
"Motor coordination/balance (rotarod test)"
],
"main_findings": "The study reports that prenatal 900 MHz EMF exposure adversely affected peripheral nerve development, with morphological alterations detectable in the sciatic nerve at postnatal day 60. The authors report these morphological changes persisted into adulthood but were not severe enough to significantly impact measured functional outcomes related to the sciatic nerve.",
"effect_direction": "mixed",
"limitations": [
"Animal model; findings may not generalize to humans",
"Exposure metric details (e.g., SAR) not reported in the abstract",
"Functional outcomes may not capture subtle deficits; abstract notes no significant functional impact despite morphological changes",
"Sample size is small (nine pregnant rats)"
],
"evidence_strength": "low",
"confidence": 0.7800000000000000266453525910037569701671600341796875,
"peer_reviewed_likely": "yes",
"stance": "concern",
"stance_confidence": 0.6999999999999999555910790149937383830547332763671875,
"summary": "This animal study exposed pregnant Sprague Dawley rats to a 900 MHz electromagnetic field for 1 hour daily throughout gestation and assessed offspring outcomes postnatally. Sciatic nerve analyses at postnatal day 60 indicated persistent morphological alterations attributed to prenatal EMF exposure. However, the reported changes were not severe enough to significantly affect measured functional outcomes (including electrophysiology and locomotor tests).",
"key_points": [
"Nine pregnant rats were assigned to control, sham (cage only), or 900 MHz EMF exposure groups.",
"Exposure occurred prenatally for 1 hour per day across gestational days 1–21.",
"Offspring were tested on postnatal days 21 and 60 with open field and rotarod assessments and underwent electrophysiological studies.",
"Sciatic nerves collected at postnatal day 60 were evaluated with histopathological, histomorphometric, immunohistochemical, and biochemical methods.",
"Prenatal 900 MHz EMF exposure was reported to adversely affect peripheral nerve development and produce detectable sciatic nerve morphological changes.",
"The abstract reports these morphological changes persisted into adulthood but did not significantly impair the functional measures used.",
"The authors emphasize the need for further research on long-term impacts of prenatal EMF exposure during development."
],
"categories": [
"Animal Studies",
"Prenatal & Developmental Exposure",
"Neuroscience",
"Radiofrequency (RF)"
],
"tags": [
"Prenatal Exposure",
"900 MHz",
"Radiofrequency EMF",
"Rat Model",
"Sprague Dawley",
"Peripheral Nerve",
"Sciatic Nerve",
"Nerve Morphology",
"Histopathology",
"Nerve Conduction Velocity",
"Open Field Test",
"Rotarod Test",
"Developmental Neurotoxicity"
],
"keywords": [
"EMF",
"prenatal exposure",
"peripheral nerve",
"rat model",
"nerve morphology",
"nerve conduction",
"developmental neurotoxicity"
],
"suggested_hubs": [],
"social": {
"tweet": "Rat study: prenatal 900 MHz EMF exposure (1 h/day during gestation) was associated with persistent sciatic nerve morphological changes at PN day 60, but functional measures (electrophysiology/behavior tests) were not significantly affected. More research on developmental exposure is urged.",
"facebook": "In a rat model, prenatal exposure to a 900 MHz electromagnetic field for 1 hour daily throughout pregnancy was reported to cause lasting morphological changes in the sciatic nerve detectable in adulthood. The study did not find these changes severe enough to significantly alter the functional outcomes measured, and it calls for further research on developmental exposure.",
"linkedin": "Animal study (Electromagnetic Biology and Medicine, 2025): Prenatal 900 MHz EMF exposure (1 h/day across gestation) was reported to produce persistent sciatic nerve morphological alterations in offspring, detectable at PN day 60, while measured functional outcomes were not significantly impacted. The authors highlight the importance of further work on long-term developmental exposure effects."
}
}
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