Effects of aromatase inhibition versus gonadectomy on hippocampal complex amyloid pathology in triple transgenic mice

Cassia R. Overk, Pei Yi Lu, Yue Ting Wang, Jaewoo Choi, James W. Shaw, Gregory R. Thatcher, Elliott J. Mufson

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Alzheimer's disease (AD) is the most common form of dementia among the elderly with women exhibiting a higher risk than men for the disease. Due to these gender differences, there is great interest in the role that estrogens play in cognitive impairment and the onset of the classic amyloid and tau lesions in AD. Human and rodent studies indicate a strong association between low brain aromatase, sex hormone levels, and beta amyloid deposition. Therefore, the effects of depleting both circulating and brain estrogen levels, through gonadectomy and/or treatment with the aromatase inhibitor, anastrozole, upon hippocampal AD-like pathology in male and female 3xTgAD mice were evaluated. Liquid chromatography-mass spectrometry revealed anastrozole serum levels of 10.19. ng/mL and for the first time brain levels were detected at 4.7. pg/mL. Densitometric analysis of the hippocampus revealed that anastrozole significantly increased Aβ- but not APP/Aβ-immunoreactivity in intact 3xTgAD females compared to controls (p < 0.001). Moreover, anastrozole significantly increased the number of Aβ- compared to APP/Aβ-positive hippocampal CA1 neurons in intact and gonadectomized female mice. Concurrently, anastrozole significantly reduced the APP/Aβ plaque load in 9. month old female 3xTgAD mice. These data suggest that anastrozole treatment differentially affects select amyloid species which in turn may play a role in the extraneuronal to intraneuronal deposition of this peptide.

Original languageEnglish (US)
Pages (from-to)479-487
Number of pages9
JournalNeurobiology of Disease
Volume45
Issue number1
DOIs
StatePublished - Jan 2012
Externally publishedYes

ASJC Scopus subject areas

  • Neurology

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