Extremely low-frequency electromagnetic fields differentially regulate estrogen receptor-alpha and -beta expression...

Area of Science:

• Neuroscience
• Endocrinology
• Environmental Health

Background:

• Biological systems are increasingly investigated for effects of extremely low-frequency electromagnetic fields (ELF EMF).
• Estrogen receptors (ERs) play crucial roles in the olfactory bulb (OB).

Purpose of the Study:

• To investigate the influence of ELF EMF on estrogen receptor alpha (ER alpha) and estrogen receptor beta (ER beta) mRNA expression in the adult rat OB.
• To determine if ELF EMF affects OB ER mRNA expression differently in males and females, and across the estrous cycle.

Main Methods:

• Adult female and male rats were exposed to ELF EMF.
• Reverse transcription polymerase chain reaction (RT-PCR) was used to quantify ER alpha and ER beta mRNA levels in the olfactory bulb.

Main Results:

• ELF EMF exhibited a biphasic effect on female OB ER beta mRNA expression, increasing during diestrous and decreasing during estrous.
• No significant influence of ELF EMF was observed on female OB ER alpha mRNA expression.
• Female OB ER alpha and ER beta mRNA expression naturally fluctuated across the estrous cycle.
• No variations in OB ER alpha or ER beta mRNA expression were observed in male rats, regardless of ELF EMF exposure.

Conclusions:

• ELF EMF can modulate ER beta gene expression in the olfactory bulb of adult female rats.
• ELF EMF does not appear to affect ER mRNA expression in the male rat olfactory bulb.
• The findings highlight sex-specific responses to ELF EMF in the OB related to estrogen receptor gene expression.