Brain-derived estrogen deficiency impairs spatial memory, social behavior, and hippocampal extracellular matrix integrity selectively in aged female mice, revealing a sex- and age-dependent mechanism linking local estrogen loss to Alzheimer's-related cognitive decline. This work identifies a previously uncharacterized pathway through which estrogen protects the structural environment of the hippocampus during aging.
Key Points
- Brain estrogen loss causes memory and social deficits only in aged females
- Extracellular matrix dysregulation precedes cognitive decline in aged female mice
- Sex and age together determine vulnerability to estrogen deficiency effects
Longevity Analysis
The disproportionate Alzheimer's burden in women may originate not from systemic hormonal loss alone, but from age-dependent failure of local brain estrogen synthesis and its role in maintaining the structural scaffolding that supports neuronal function. The finding that extracellular matrix genes dysregulate specifically in aged females with reduced brain estrogen points toward a mechanism of neurodegeneration that operates through architectural degradation of the hippocampal microenvironment. This suggests interventions targeting either estrogen replacement or extracellular matrix stabilization might address disease vulnerability in this population, but only if timed appropriately relative to age and baseline endocrine state.
Original published by Wiley Aging Cell, by Natalie C. Piehl, Ariel W. Halle, Guadalupe Rodriguez, Andrea Locci, Stacy Kujawa, Caroline Haywood, John Coon V, Ross P. McNally, Zaina A. Karim, Tianming You, Hongxin Dong, Serdar E. Bulun, Hong Zhao .