Long-term exposure to 4G smartphone radiofrequency electromagnetic radiation diminished male reproductive potential by directly disrupting Spock3-MMP2-BTB axis in the testes of adult rats

2019 · Harm · Low evidence

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HarmLow evidencePaper 1705

Study snapshot

Publicationmanual · 2019

Study typeanimal

Reported directionHarm

Evidence ratingLow

Abstract

Long-term exposure to 4G smartphone radiofrequency electromagnetic radiation diminished male reproductive potential by directly disrupting Spock3-MMP2-BTB axis in the testes of adult rats Yu G, Tang Z, Chen H, Chen Z, Wang L, Cao H, Wang G, Xing J, Shen H, Cheng Q, Li D, Wang G, Xiang Y, Guan Y, Zhu Y, Liu Z, Bai Z. Long-term exposure to 4G smartphone radiofrequency electromagnetic radiation diminished male reproductive potential by directly disrupting Spock3-MMP2-BTB axis in the testes of adult rats. Sci Total Environ. 2019 Aug 31;698:133860. doi: 10.1016/j.scitotenv.2019.133860. Abstract The correlation between long-term exposure to SRF-EMR and the decline in male fertility is gradually receiving increasing attention from the medical society. While male reproductive organs are often exposed to SRF-EMR, little is currently known about the direct effects of long-term SRF-EMR exposure on the testes and its involvement in the suppression of male reproductive potential. The present study was designed to investigate this issue by using 4G SRF-EMR in rats. A unique exposure model using a 4G smartphone achieved localized exposure to the scrotum of the rats for 6 h each day (the smartphone was kept on active talk mode and received an external call for 1 min over 10 min intervals). Results showed that SRF-EMR exposure for 150 days decreased sperm quality and pup weight, accompanied by testicular injury. However, these adverse effects were not evident in rats exposed to SRF-EMR for 50 days or 100 days. Sequencing analysis and western blotting suggested Spock3 overexpression in the testes of rats exposed to SRF-EMR for 150 days. Inhibition of Spock3 overexpression improved sperm quality decline and alleviated testicular injury and BTB disorder in the exposed rats. Additionally, SRF-EMR exposure suppressed MMP2 activity, while increasing the activity of the MMP14- Spock3 complexes and decreasing MMP14-MMP2 complexes; these results were reversed by Spock3 inhibition. Thus, long-term exposure to 4G SRF-EMR diminished male fertility by directly disrupting the Spock3-MMP2-BTB axis in the testes of adult rats. To our knowledge, this is the first study to show direct toxicity of SRF-EMR on the testes emerging after long-term exposure. ncbi.nlm.nih.gov

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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 rats (male)

Sample sizeNot supplied

ExposureRF · Localized scrotal exposure using a 4G smartphone for 6 h/day; assessed at 50, 100, and 150 days (active talk mode; external call 1 min every 10 min).

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In rats exposed to 4G smartphone RF-EMR localized to the scrotum for 6 h/day, 150 days of exposure decreased sperm quality and pup weight and was accompanied by testicular injury; these adverse effects were not evident after 50 or 100 days. Molecular analyses suggested Spock3 overexpression and altered MMP2/MMP14 complex activity with 150-day exposure, and inhibition of Spock3 overexpression improved sperm quality decline and alleviated testicular injury and BTB disorder.

Outcomes measured

Sperm quality
Male reproductive potential/fertility
Pup weight
Testicular injury
Spock3 expression (testes)
Blood-testis barrier (BTB) disorder
MMP2 activity
MMP14-Spock3 complexes activity
MMP14-MMP2 complexes

Limitations

Sample size not reported in the provided abstract/metadata
Exposure metrics such as frequency and SAR not reported
Animal model; generalizability to humans not established in the abstract
Exposure was localized to the scrotum and may not reflect typical whole-body/real-world phone use patterns

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "Localized scrotal exposure using a 4G smartphone for 6 h/day; assessed at 50, 100, and 150 days (active talk mode; external call 1 min every 10 min)."
  },
  "population": "Adult rats (male)",
  "sample_size": null,
  "outcomes": [
    "Sperm quality",
    "Male reproductive potential/fertility",
    "Pup weight",
    "Testicular injury",
    "Spock3 expression (testes)",
    "Blood-testis barrier (BTB) disorder",
    "MMP2 activity",
    "MMP14-Spock3 complexes activity",
    "MMP14-MMP2 complexes"
  ],
  "main_findings": "In rats exposed to 4G smartphone RF-EMR localized to the scrotum for 6 h/day, 150 days of exposure decreased sperm quality and pup weight and was accompanied by testicular injury; these adverse effects were not evident after 50 or 100 days. Molecular analyses suggested Spock3 overexpression and altered MMP2/MMP14 complex activity with 150-day exposure, and inhibition of Spock3 overexpression improved sperm quality decline and alleviated testicular injury and BTB disorder.",
  "effect_direction": "harm",
  "limitations": [
    "Sample size not reported in the provided abstract/metadata",
    "Exposure metrics such as frequency and SAR not reported",
    "Animal model; generalizability to humans not established in the abstract",
    "Exposure was localized to the scrotum and may not reflect typical whole-body/real-world phone use patterns"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "4G",
    "smartphone",
    "SRF-EMR",
    "radiofrequency electromagnetic radiation",
    "rats",
    "testes",
    "male fertility",
    "sperm quality",
    "blood-testis barrier",
    "Spock3",
    "MMP2",
    "MMP14"
  ],
  "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: 10.1016/j.scitotenv.2019.133860
PubMed: Not supplied

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