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Basic Science and Pathogenesis.

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Estrogen loss in female rats impairs brain cell metabolism and function, increasing Alzheimer

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Genomics

Background:

  • Estrogen regulates female brain homeostasis, including metabolism, immunity, and neuronal function.
  • Menopausal transition and estrogen loss are linked to reduced brain metabolism, increased neuroinflammation, and higher Alzheimer's disease (AD) risk in women.
  • Cell-specific responses to estrogen deficiency in the hippocampus, a key AD-affected region, remain poorly understood.

Purpose of the Study:

  • To identify hippocampal cells and molecular pathways impacted by estrogen deficiency.
  • To investigate the effects of 17β-estradiol (E2) replacement on these changes.

Main Methods:

  • Single-nucleus RNA sequencing (snRNA-seq) was performed on hippocampus from sham-operated (SHAM), ovariectomized (OVX), and OVX+E2 treated rats.
  • Cell populations were annotated using cell type-specific markers.
  • Transcriptomic data were analyzed to identify differentially expressed genes and altered pathways.

Main Results:

  • Estrogen deficiency (OVX) reduced the proportion of a specific excitatory neuron subpopulation (Exc1) expressing vGlut2, with partial rescue by E2.
  • Other neuronal subtypes and oligodendrocytes were also affected by estrogen loss.
  • Pathway analysis revealed alterations in antigen processing, cholesterol metabolism, insulin resistance, and glutamatergic synapses in OVX rats; oxidative phosphorylation was reduced in estrogen-sensitive neurons.

Conclusions:

  • Estrogen loss impacts bioenergetics (oxidative phosphorylation), neuroinflammation, and synaptic function in a cell-type-specific manner.
  • These findings highlight specific cellular and molecular mechanisms contributing to brain vulnerability in estrogen-deficient states.
  • Further research will elucidate cell-specific pathway contributions to estrogen deficiency-induced brain changes.