Electromagnetic Field (EMF) Radiation Alters Estrogen Release from the Pig Myometrium during the Peri-Implantation Period.

Abstract

An electromagnetic field (EMF) may affect the functions of uterine tissues. This study hypothesized that EMF changes the estrogenic activity of pig myometrium during the peri-implantation period. Tissue was collected on days 15-16 of the gestation and incubated in the presence of EMF (50 and 120 Hz, 2 and 4 h). The () and () mRNA transcript abundance, cytochrome P450arom (aromatase), and 17 hydroxysteroid dehydrogenase 17HSD) protein abundance and estrone (E) and estradiol-17 (E) release were examined using Real-Time PCR, Western blot and radioimmunoassay. Selected myometrial slices were treated with progesterone (P) to determine whether it functions as a protector against EMF. mRNA transcript abundance in slices treated with EMF was less at 50 Hz (2 h) and greater at 120 Hz (2 and 4 h). mRNA transcript was greater in slices treated with EMF at 120 Hz (2 h). Progesterone diminished EMF-related effects on and . When P was added, EMF had suppressive (50 and 120 Hz, 2 h) or enhancing (50 Hz, 4 h) effects on aromatase abundance. The E release was lower after 4 h of EMF treatment at 50 Hz and P did not protect myometrial E release. In conclusion, EMF alters the synthesis and release of E and did not affect E release in the myometrium during the peri-implantation period.

AI evidence extraction

Main findings

Pig myometrium slices incubated with ELF-EMF (50 or 120 Hz for 2 or 4 h) showed changes in estrogen-related mRNA transcript abundance and aromatase protein abundance, with direction depending on frequency, duration, and progesterone co-treatment. Estrone (E1) release was lower after 4 h EMF at 50 Hz and progesterone did not protect E1 release. The authors conclude EMF alters synthesis and release of E1 and did not affect E2 release during the peri-implantation period.

Outcomes measured

• mRNA transcript abundance of estrogen-related genes (not fully specified in abstract)
• Cytochrome P450arom (aromatase) protein abundance
• 17β-hydroxysteroid dehydrogenase (17HSD) protein abundance
• Estrone (E1) release
• Estradiol-17β (E2) release
• Effect modification by progesterone treatment

Limitations

• Sample size not reported in abstract
• Ex vivo tissue incubation model; may not reflect whole-animal exposure conditions
• Exposure metrics beyond frequency and duration (e.g., field strength) not reported in abstract
• Some gene targets are not fully specified in the abstract (placeholders present)

Suggested hubs

• elf-emf (0.9)
  Exposure is extremely low frequency EMF at 50 and 120 Hz.
• animal-studies (0.85)
  Study uses pig myometrium tissue from gestation days 15–16 (animal/ex vivo).

{
    "study_type": "animal",
    "exposure": {
        "band": "ELF",
        "source": null,
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "2 and 4 h"
    },
    "population": "Pig myometrium tissue slices collected on gestation days 15–16 (peri-implantation period)",
    "sample_size": null,
    "outcomes": [
        "mRNA transcript abundance of estrogen-related genes (not fully specified in abstract)",
        "Cytochrome P450arom (aromatase) protein abundance",
        "17β-hydroxysteroid dehydrogenase (17HSD) protein abundance",
        "Estrone (E1) release",
        "Estradiol-17β (E2) release",
        "Effect modification by progesterone treatment"
    ],
    "main_findings": "Pig myometrium slices incubated with ELF-EMF (50 or 120 Hz for 2 or 4 h) showed changes in estrogen-related mRNA transcript abundance and aromatase protein abundance, with direction depending on frequency, duration, and progesterone co-treatment. Estrone (E1) release was lower after 4 h EMF at 50 Hz and progesterone did not protect E1 release. The authors conclude EMF alters synthesis and release of E1 and did not affect E2 release during the peri-implantation period.",
    "effect_direction": "mixed",
    "limitations": [
        "Sample size not reported in abstract",
        "Ex vivo tissue incubation model; may not reflect whole-animal exposure conditions",
        "Exposure metrics beyond frequency and duration (e.g., field strength) not reported in abstract",
        "Some gene targets are not fully specified in the abstract (placeholders present)"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "ELF-EMF",
        "50 Hz",
        "120 Hz",
        "myometrium",
        "pig",
        "peri-implantation",
        "estrogen",
        "estrone",
        "estradiol-17β",
        "aromatase",
        "17HSD",
        "progesterone"
    ],
    "suggested_hubs": [
        {
            "slug": "elf-emf",
            "weight": 0.90000000000000002220446049250313080847263336181640625,
            "reason": "Exposure is extremely low frequency EMF at 50 and 120 Hz."
        },
        {
            "slug": "animal-studies",
            "weight": 0.84999999999999997779553950749686919152736663818359375,
            "reason": "Study uses pig myometrium tissue from gestation days 15–16 (animal/ex vivo)."
        }
    ]
}

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