Down-regulation of metallothionein 1 and 2 after exposure to electromagnetic field in mouse testis.

Iranian biomedical journal · 2011 · Harm · Low evidence

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HarmLow evidencePaper 3218

Mice exposed to a 3 mT electromagnetic field for 8 weeks (4 h/day) showed increased numbers of primary spermatocytes and Leydig cells, and increased basement membrane thickness versus controls (P<0.01). MT1 and MT2 were significantly down-regulated in testis …

Study snapshot

PublicationIranian biomedical journal · 2011

Study typeanimal

Reported directionHarm

Evidence ratingLow

Abstract

BACKGROUND: It is proved that testis is sensitive to electromagnetic field (EMF) and its damage results in infertility. Exposure to EMF induces reactive oxygen species production and affects on anti-oxidants defense mechanisms. Metallothionein (MT) is a name for a group of low molecular weight (6-7 kDa), sulfhydryl rich proteins. Expression of MT1 and MT2 genes in testis tissue after EMF exposure was aimed in this study. METHODS: Male BALB/c mice (8 weeks old) were exposed to 3 MT EMF for 8 weeks, 4 hours/day. After 8 weeks, the mice were sacrificed and the testis tissue was removed. The testis pieces were stained with hematoxylin and eosin and analyzed under an optical microscope. Assessment of MT1 and MT2 genes and also protein expression was performed by real-time PCR and Western-blot, respectively. RESULTS: In light microscopic observation, the number of primary spermatocytes was increased significantly in EMF group (P < 0.01). In addition, in interstitial space, the number of leydig cells was increased significantly in EMF group (P < 0.01) and basement membrane thickness was increased as well. MT1 and MT2 genes were down-regulated significantly in testis tissue of mice exposed to EMF both in mRNA and protein level compared to control. CONCLUSION: It is clear that MT is mediated in testis development and spermatogenesis. Down-regulation of MT1 and MT2 after EMF in mouse testis might be followed by some consequences that result in infertility.

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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

PopulationMale BALB/c mice (8 weeks old)

Sample sizeNot supplied

Exposure8 weeks, 4 hours/day

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Outcomes measured

Testis histology (primary spermatocytes, Leydig cell number, basement membrane thickness)
MT1 and MT2 gene expression (mRNA)
MT1 and MT2 protein expression

Limitations

Frequency and other exposure characteristics beyond field strength (3 mT) not reported in abstract
Sample size not reported in abstract
Animal study; relevance to human infertility not directly tested
Fertility outcomes (e.g., sperm parameters, mating success) not reported in abstract

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": null,
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "8 weeks, 4 hours/day"
  },
  "population": "Male BALB/c mice (8 weeks old)",
  "sample_size": null,
  "outcomes": [
    "Testis histology (primary spermatocytes, Leydig cell number, basement membrane thickness)",
    "MT1 and MT2 gene expression (mRNA)",
    "MT1 and MT2 protein expression"
  ],
  "main_findings": "Mice exposed to a 3 mT electromagnetic field for 8 weeks (4 h/day) showed increased numbers of primary spermatocytes and Leydig cells, and increased basement membrane thickness versus controls (P<0.01). MT1 and MT2 were significantly down-regulated in testis tissue at both mRNA and protein levels compared with controls.",
  "effect_direction": "harm",
  "limitations": [
    "Frequency and other exposure characteristics beyond field strength (3 mT) not reported in abstract",
    "Sample size not reported in abstract",
    "Animal study; relevance to human infertility not directly tested",
    "Fertility outcomes (e.g., sperm parameters, mating success) not reported in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic field",
    "mouse",
    "testis",
    "metallothionein",
    "MT1",
    "MT2",
    "oxidative stress",
    "spermatogenesis",
    "Leydig cells",
    "histology",
    "real-time PCR",
    "Western blot"
  ],
  "suggested_hubs": [
    {
      "slug": "animal-studies",
      "weight": 0.9,
      "reason": "Experimental EMF exposure study in mice assessing testis histology and gene/protein expression."
    }
  ]
}

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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: 10.6091/ibj.926.2012
PubMed: 22395140

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