Molecular Neurobiology

, Volume 47, Issue 3, pp 857–867 | Cite as

Brain Endogenous Estrogen Levels Determine Responses to Estrogen Replacement Therapy via Regulation of BACE1 and NEP in Female Alzheimer’s Transgenic Mice

  • Rena Li
  • Ping He
  • Jie Cui
  • Matthias Staufenbiel
  • Nobuhiro Harada
  • Yong Shen
Article

Abstract

Estrogens have been found to improve memory and reduce risk of dementia, although conflicting results such as failure of estrogen replacement therapy for treatment of Alzheimer's disease (AD) also has been reported. Only recently, our published human brain studies showed a depletion of brain estrogen in women with AD, while other studies have demonstrated cognitive impairment believed to be caused by inhibition of endogenous estrogen synthesis in females. To investigate whether the shortage of brain estrogen alters the sensitivity of response to estrogen replacement therapy, we have used genetic and surgical animal models to examine the response of estrogen treatment in AD neuropathology. Our studies have shown that early treatment with 17β-estradiol (E2) or genistein could reduce brain amyloid levels by increasing Aβ clearance in both APP23 mice with genetic deficiency of aromatase (APP/Ar+/−), in which the brains contain nondetectable levels of estrogen, and in APP23 mice with an ovariectomy (APP/OVX), in which the brains still contain certain levels of estrogen. However, only APP/Ar+/− mice showed a great reduction in brain amyloid plaque formation after E2 or genistein treatment along with downregulation of β-secretase (BACE1) mRNA and protein expression. Our results suggest that early and long-term usage of E2 and/or genistein may prevent AD pathologies in a dependent manner on endogenous brain estrogen levels in aged females.

Keywords

Brain estrogen Hormone therapy Alzheimer's disease BACE1 Aβ deposition 

Notes

Acknowledgments

This work was supported by grants from the Alzheimer's Association IIRG-07-59510, American Health Assistance Foundation Grant G2006-118, NIH R01AG032441, and NIH R01AG025888. We thank Mr. Alex Bishop for editing and proofreading the manuscript.

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Rena Li
    • 1
  • Ping He
    • 1
    • 2
  • Jie Cui
    • 1
  • Matthias Staufenbiel
    • 3
  • Nobuhiro Harada
    • 4
  • Yong Shen
    • 2
  1. 1.Center for Hormone Advanced Science and EducationRoskamp InstituteSarasotaUSA
  2. 2.Center for Advanced Therapeutic Strategies for Brain DisordersRoskamp InstituteSarasotaUSA
  3. 3.Novartis Pharma Ltd., Nervous System ResearchBaselSwitzerland
  4. 4.School of MedicineFujita Health UniversityAichiJapan

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