Lab study, 2000
Does estrogen change how brain chemicals control mood and thinking?
Yes, but only with acute short-term exposure. A single dose of estrogen reduced the response of several brain receptors involved in mood, but 14-day continuous exposure did not change these receptors.
What they did
Lab study in rats whose ovaries had been removed. Researchers tested how estradiol affects brain receptors in two ways: an acute single injection and continuous exposure using an implanted slow-release pellet for 14 days. They measured how well these receptors work using a functional test.
What they found
After acute estradiol injection, the response of serotonin receptors involved in mood decreased approximately 25% in the hippocampus, cortex, and amygdala. Acute estradiol also reduced the response of other receptors in various brain regions. However, 14-day continuous estradiol treatment did not alter the response of any of these receptors.
What it means for you
Estrogen has rapid effects on brain chemicals that regulate mood, but these effects wear off or the brain adapts when estrogen is continuously present. This might help explain why mood symptoms related to estrogen shifts are temporary. However, this is a lab study in rats, so it is unclear whether the same mechanism applies to humans.
25% decrease
serotonin receptor response with acute estradiol
14 days
duration of continuous estradiol exposure
3 brain regions
where serotonin response decreased
About the study
- Original title
- Acute and long-term effects of 17beta-estradiol on G(i/o) coupled neurotransmitter receptor function in the female rat brain as assessed by agonist-stimulated [35S]GTPgammaS binding
- Authors
- Mize AL, Alper RH
- Journal
- Brain research
- Year
- 2000
- Study design
- Lab study
- What was tested
- Acute single estradiol injection or 14-day continuous slow-release estradiol pellet
- Read the paper
- doi.org/10.1016/s0006-8993(00)01998-3
Topics
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