Effects of electromagnetic field (EMF) radiation on androgen synthesis and release from the pig endometrium during the fetal peri-implantation period

{
  "publication_year": 2021,
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": "laboratory exposure (in vitro endometrial tissue)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "2 and 4 h incubation"
  },
  "population": "Pig endometrial slices collected during days 15–16 of gestation (fetal peri-implantation period)",
  "sample_size": 5,
  "outcomes": [
    "CYP17A1 mRNA transcript abundance",
    "HSD3B1 mRNA transcript abundance",
    "Cytochrome P450c17 (steroid 17α-hydroxylase/17,20-lyase) protein abundance",
    "3βHSD protein abundance",
    "Androstenedione (A4) release into media",
    "Testosterone (T) release into media"
  ],
  "main_findings": "In vitro EMF exposure (50 or 120 Hz) altered androgen release from pig endometrial slices, with effects depending on progesterone (P4) presence and incubation time. With P4, EMF suppressed testosterone release after 2 and 4 h and increased androstenedione release after 4 h at 120 Hz. Without P4, EMF decreased androstenedione release after 2 h at 120 Hz and after 4 h at both 50 and 120 Hz; the authors report P4 did not protect tissue from EMF radiation.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro tissue-slice model may not reflect in vivo reproductive physiology",
    "Small sample size (n=5 pigs)",
    "Short exposure durations (2–4 h)",
    "Exposure characterization limited to frequency and incubation time; other dosimetry details not provided in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "stance": "concern",
  "stance_confidence": 0.66,
  "summary": "This in vitro study exposed pig endometrial slices collected during days 15–16 of gestation to ELF-EMF at 50 or 120 Hz for 2 or 4 hours, with or without progesterone. The authors report that EMF exposure changed androgen release (testosterone and androstenedione) in a time-, frequency-, and progesterone-dependent manner. Progesterone supplementation did not appear to protect the tissue from EMF-related changes under these conditions.",
  "key_points": [
    "Endometrial slices from pregnant pigs (n=5) were incubated with 50 or 120 Hz EMF for 2 or 4 hours.",
    "The experiment tested EMF effects both in the presence and absence of progesterone (10^-5 M).",
    "With progesterone present, EMF suppressed testosterone release after 2 and 4 hours.",
    "With progesterone present, EMF increased androstenedione release after 4 hours at 120 Hz.",
    "Without progesterone, EMF decreased androstenedione release after 2 hours at 120 Hz and after 4 hours at 50 and 120 Hz.",
    "The authors report progesterone did not protect the endometrium against EMF radiation in this setting."
  ],
  "categories": [
    "Reproductive Health",
    "Endocrine Effects",
    "Laboratory Studies",
    "ELF (Extremely Low Frequency)"
  ],
  "tags": [
    "Pig Endometrium",
    "In Vitro",
    "Extremely Low Frequency EMF",
    "50 Hz",
    "120 Hz",
    "Progesterone",
    "Androgen Synthesis",
    "Testosterone",
    "Androstenedione",
    "Peri-Implantation"
  ],
  "keywords": [
    "electromagnetic field",
    "EMF",
    "50 Hz",
    "120 Hz",
    "pig",
    "endometrium",
    "peri-implantation",
    "progesterone",
    "CYP17A1",
    "HSD3B1",
    "testosterone",
    "androstenedione"
  ],
  "suggested_hubs": [],
  "social": {
    "tweet": "In vitro pig endometrial slices exposed to 50/120 Hz EMF (2–4 h) showed time- and progesterone-dependent changes in androgen release (testosterone, androstenedione); progesterone did not appear protective in this model.",
    "facebook": "A lab study using pig endometrial tissue slices (days 15–16 of gestation) reports that 50/120 Hz EMF exposure for 2–4 hours altered androgen release, with effects depending on whether progesterone was present. The authors did not find progesterone protected the tissue from EMF-related changes under these conditions.",
    "linkedin": "Animal reproduction research (in vitro): pig endometrial slices from the peri-implantation period exposed to 50/120 Hz EMF for 2–4 hours showed altered androgen release patterns (testosterone and androstenedione) that depended on progesterone presence and exposure duration; progesterone was not protective in this model."
  }
}