Effects of 60 Hz electromagnetic field exposure on testicular germ cell apoptosis in mice.

Asian journal of andrology · 2004 · Harm · Low evidence

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HarmLow evidencePaper 5231

Study snapshot

PublicationAsian journal of andrology · 2004

Study typeanimal

Reported directionHarm

Evidence ratingLow

Abstract

AIM: To evaluate the effects of 60 Hz extremely low frequency (ELF) elelctromagnetic field (EMF) exposure on germ cell apoptosis in the testis of mice. METHODS: Adult male BALB/c mice (7 weeks of age) were exposed to a 60 Hz EMF of 0.1 mT or 0.5 mT for 24 h/day. A sham-exposed group served as the control. After 8 weeks of exposure, the mice were sacrificed. Germ cell apoptosis in the testis was assessed by histopathological examination, the terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling assay (TUNEL) and flow cytometric examination of isolated spermatogenic cells stained with 7 aminoactinomycin D (7-AAD). RESULTS: EMF exposure did not significantly affect the body and testis weights, but significantly increased the incidence of germ cell death. The distinguishing morphological feature of EMF exposure was a decrement in the number of well organized seminiferous tubules. Quantitative analysis of TUNEL-positive germ cells showed a significantly higher apoptotic rate in the 0.5 mT exposed mice than that in the sham controls (P<0.05), while the difference between the two exposed groups was insignificant. The TUNEL-positive cells were mainly spermatogonia. In flow cytometry analysis, the percentage of live cells [forward scatter count (FSC)(high)7-AAD(-)] was lower in the exposed groups than that in the controls (Figure 5A), but the decrease in viability was not statistically significant. CONCLUSION: Continuous exposure to ELF EMF may induce testicular germ cell apoptosis in mice.

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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 directionharm

PopulationAdult male BALB/c mice (7 weeks of age)

Sample sizeNot supplied

ExposureELF · 6e-05 MHz · 24 h/day for 8 weeks

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Mice exposed continuously to 60 Hz EMF (0.1 or 0.5 mT) for 8 weeks had no significant changes in body or testis weights, but showed increased incidence of germ cell death and fewer well-organized seminiferous tubules. TUNEL analysis found a significantly higher apoptotic rate in the 0.5 mT group versus sham controls (P<0.05), with TUNEL-positive cells mainly spermatogonia; flow cytometry suggested lower viability in exposed groups but not statistically significant.

Outcomes measured

Testicular germ cell apoptosis
Body weight
Testis weight
Seminiferous tubule organization/morphology
Spermatogenic cell viability (flow cytometry; 7-AAD)

Limitations

Sample size not reported in abstract
Statistical details limited (e.g., exact effect sizes not provided)
Flow cytometry viability decrease was not statistically significant

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": "other",
    "frequency_mhz": 6e-05,
    "sar_wkg": null,
    "duration": "24 h/day for 8 weeks"
  },
  "population": "Adult male BALB/c mice (7 weeks of age)",
  "sample_size": null,
  "outcomes": [
    "Testicular germ cell apoptosis",
    "Body weight",
    "Testis weight",
    "Seminiferous tubule organization/morphology",
    "Spermatogenic cell viability (flow cytometry; 7-AAD)"
  ],
  "main_findings": "Mice exposed continuously to 60 Hz EMF (0.1 or 0.5 mT) for 8 weeks had no significant changes in body or testis weights, but showed increased incidence of germ cell death and fewer well-organized seminiferous tubules. TUNEL analysis found a significantly higher apoptotic rate in the 0.5 mT group versus sham controls (P<0.05), with TUNEL-positive cells mainly spermatogonia; flow cytometry suggested lower viability in exposed groups but not statistically significant.",
  "effect_direction": "harm",
  "limitations": [
    "Sample size not reported in abstract",
    "Statistical details limited (e.g., exact effect sizes not provided)",
    "Flow cytometry viability decrease was not statistically significant"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "60 Hz",
    "extremely low frequency",
    "ELF",
    "electromagnetic field",
    "EMF",
    "mice",
    "testis",
    "germ cell apoptosis",
    "TUNEL",
    "spermatogonia",
    "seminiferous tubules",
    "flow cytometry",
    "7-AAD",
    "0.1 mT",
    "0.5 mT"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.25,
      "reason": "Study evaluates 60 Hz ELF magnetic field exposure levels relevant to power-frequency environments, though no specific occupational setting is described."
    }
  ]
}

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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: 15064831

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