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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 cytochrome P450 aromatase type 3 ( CYP19A3 ) and hydroxysteroid 17β dehydrogenase type 4 ( HSD17B4 ) mRNA transcript abundance, cytochrome P450arom (aromatase), and 17 β hydroxysteroid dehydrogenase 17 β HSD) protein abundance and estrone (E 1 ) and estradiol-17 β (E 2 ) release were examined using Real-Time PCR, Western blot and radioimmunoassay. Selected myometrial slices were treated with progesterone (P 4 ) to determine whether it functions as a protector against EMF. CYP19A3 mRNA transcript abundance in slices treated with EMF was less at 50 Hz (2 h) and greater at 120 Hz (2 and 4 h). HSD17B4 mRNA transcript was greater in slices treated with EMF at 120 Hz (2 h). Progesterone diminished EMF-related effects on CYP19A3 and HSD17B4 . When P 4 was added, EMF had suppressive (50 and 120 Hz, 2 h) or enhancing (50 Hz, 4 h) effects on aromatase abundance. The E 1 release was lower after 4 h of EMF treatment at 50 Hz and P 4 did not protect myometrial E 1 release. In conclusion, EMF alters the synthesis and release of E 1 and did not affect E 2 release in the myometrium during the peri-implantation period.

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