[Effects of different frequency electromagnetic fields on the differentiation of midbrain neural stem cells].

Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering · 2002 · Benefit · Low evidence

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Study snapshot

PublicationHang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering · 2002

Study typeanimal

Reported directionBenefit

Evidence ratingLow

Abstract

Objective. To examine the effect of electromagnetic fields (EMF) (20 Hz, 8 mT; 5 Hz, 8 mT) on the neuron-orientated differentiation of neural stem cells (NSCs) from midbrains of new-bom rats. Method. Differentiated NSCs were exposed to EMF for 2 x 15 min per day lasting for I d, 5 d, or 10 d. The sham-exposure controls were correspondingly established. Cells were fixed and processed for immunofluorescent staining using the antibody against neuron-specific marker MAP2, then the percentage of MAP2+ cells was calculated. Result. The two EMFs promoted the differentiation of a neuronal fate in different ways. Both of them came into effect even after 1 d exposure. When cells exposed to the 20 Hz EMF, the percentage of neuron-orientated cells gradually increased with longer-term exposure and the most significant effect appeared in 10 d group while that happened in 5 d group under the condition of 5 Hz EMF. The effect contrasted horizontally, significant differences between the two EMFs were observed only at 10 d groups, 20 Hz EMF having more favorable effect than 5 Hz EMF. Conclusion. 20 Hz and 5 Hz EMF could promote the differentiation of midbrain NSCs to a neuronal phenotype in different ways, suggesting that the physical induction might be another strategy to manipulate the differentiation of NSCs.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeanimal

Effect directionbenefit

PopulationNeural stem cells from midbrains of newborn rats (in vitro differentiation model)

Sample sizeNot supplied

ExposureELF · 2 × 15 min/day for 1, 5, or 10 days

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Differentiated midbrain neural stem cells exposed to 20 Hz (8 mT) or 5 Hz (8 mT) EMF showed increased neuronal differentiation (higher MAP2+ percentage) versus sham exposure, with effects observed after 1 day. The time course differed by frequency: 20 Hz showed a gradual increase with the largest effect at 10 days, while 5 Hz showed the most significant effect at 5 days; at 10 days, 20 Hz had a more favorable effect than 5 Hz.

Outcomes measured

Neuron-oriented differentiation (MAP2+ cell percentage)

Limitations

In vitro model using rat-derived neural stem cells; generalizability to in vivo or humans not addressed in abstract
Sample size and statistical details not reported in abstract
Only one neuronal marker (MAP2) reported as outcome in abstract
Exposure parameters limited to two frequencies at the same flux density (8 mT)

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "2 × 15 min/day for 1, 5, or 10 days"
  },
  "population": "Neural stem cells from midbrains of newborn rats (in vitro differentiation model)",
  "sample_size": null,
  "outcomes": [
    "Neuron-oriented differentiation (MAP2+ cell percentage)"
  ],
  "main_findings": "Differentiated midbrain neural stem cells exposed to 20 Hz (8 mT) or 5 Hz (8 mT) EMF showed increased neuronal differentiation (higher MAP2+ percentage) versus sham exposure, with effects observed after 1 day. The time course differed by frequency: 20 Hz showed a gradual increase with the largest effect at 10 days, while 5 Hz showed the most significant effect at 5 days; at 10 days, 20 Hz had a more favorable effect than 5 Hz.",
  "effect_direction": "benefit",
  "limitations": [
    "In vitro model using rat-derived neural stem cells; generalizability to in vivo or humans not addressed in abstract",
    "Sample size and statistical details not reported in abstract",
    "Only one neuronal marker (MAP2) reported as outcome in abstract",
    "Exposure parameters limited to two frequencies at the same flux density (8 mT)"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic fields",
    "ELF EMF",
    "20 Hz",
    "5 Hz",
    "8 mT",
    "neural stem cells",
    "midbrain",
    "rat",
    "neuronal differentiation",
    "MAP2",
    "sham control"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: Not supplied
PubMed: 12449147

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