"A study in marmosets shows a brain-specific estrogen therapy improved memory and sleep without systemic side effects."
New drug delivers estrogen only to the brain, improving memory and sleep in aged primates
A study published in JNeurosci by researchers led by Agnès Lacreuse at the University of Massachusetts Amherst examined the effects of the drug 10β,17β-dihydroxyestra-1,4-dien-3-one (DHED) in aged marmosets treated with letrozole, an estrogen production inhibitor.
Key Findings
- DHED increased estrogen specifically in the brain of letrozole-treated marmosets, avoiding systemic exposure.
- DHED treatment improved memory and sleep in the animals, reversing cognitive and behavioral deficits.
- DHED reversed neural changes induced by letrozole, restoring brain function.
- Effects on body temperature regulation differed between male and female marmosets, indicating sex-specific responses to the treatment.
Context
Letrozole is used to reduce breast cancer recurrence by inhibiting estrogen production, but patient adherence is limited due to side effects such as hot flashes, bone pain, and sleep disturbances. DHED is designed to deliver estrogen only to the brain, potentially mitigating these side effects while preserving the drug's therapeutic benefits.
"DHED is designed to deliver estrogen only to the brain, potentially mitigating systemic side effects of estrogen suppression therapy."
The researchers plan further studies to investigate the mechanisms and optimal dosing for temperature regulation issues, particularly in light of the observed sex differences.