Cited by 50Alzheimer's disease research and treatmentsNeurological Disease Mechanisms and TreatmentsEstrogen and related hormone effects

Hypersensitivity of the hippocampal CA3 region to stress-induced neurodegeneration and amyloidogenesis in a rat model of surgical menopause

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Zhang, Quan-guang, Wang, Rui-min, Scott, Erin, Han, Dong, Dong, Yan, Tu, Jing-yi, Yang, Fang, Reddy Sareddy, Gangadhara +2 more·2013·Brain

Abstract

Females who enter menopause prematurely via bilateral ovariectomy (surgical menopause) have a significantly increased risk for cognitive decline and dementia. To help elucidate the mechanisms underlying this phenomenon, we used an animal model of surgical menopause, long-term (10-week) bilateral ovariectomy in female rats. Herein, we demonstrate that long-term oestrogen deprivation dramatically increases sensitivity of the normally resistant hippocampal CA3 region to ischaemic stress, an effect that was gender-specific, as it was not observed in long-term orchiectomized males. Furthermore, the enhanced damage to the CA3 region correlated with a worse cognitive outcome after ischaemic stress. Long-term ovariectomized rats also displayed a robust hyperinduction of Alzheimer's disease-related proteins in the CA3 region and a switch in amyloid precursor protein processing from non-amyloidogenic to amyloidogenic following ischaemic stress CA3 hypersensitivity also extended to an Alzheimer's disease-relevant insult, as the CA3 region of long-term ovariectomized rats was profoundly hypersensitive to the neurotoxic effects of amyloid-β1-42, the most amyloidogenic form of the amyloid-β peptide. Additional studies revealed that CA3 region hypersensitivity, Alzheimer's disease-related protein induction, and amyloidogenesis are mediated by a NADPH oxidase/superoxide/c-Jun N-terminal kinase/c-Jun signalling pathway, involving both transcriptional and post-translational mechanisms. In addition, while 17β-oestradiol replacement at the end of the long-term oestrogen deprivation period could not prevent CA3 hypersensitivity and amyloidogenesis, if 17β-oestradiol was initiated at the time of ovariectomy and maintained throughout the 10-week oestrogen deprivation period, it completely prevented these events, providing support for the 'critical window' hypothesis for oestrogen replacement therapy benefit. Collectively, these findings may help explain the increased risk of cognitive decline and dementia observed in women following surgical menopause, and they provide increased support that early 17β-oestradiol replacement is critical in preventing the negative neural effects associated with bilateral ovariectomy.

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  • In animal experiments, bilaterally ovariectomized rats developed Aβ 1−42 in the hippocampus after exposure to stress.

    “In animal experiments, bilaterally ovariectomized rats developed Aβ 1 −42 in the hippocampus after exposure to stress, a finding which corroborate with our finding of more Aβ in women with surgical menopause at young ages [59,66].”
  • The CA3 field of the hippocampus has been implicated as one of the first sites of neuronal dysfunction and neuronal death in Alzheimer's disease.

    “This region has been implicated as one of the first sites of neuronal dysfunction and neuronal death in AD (Belvindrah et al., 2014; Padurariu et al., 2012; Zhang et al., 2013).”

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Research works printed but not linked: 1

  1. Scott E, Zhang QG, Wang R, Vadlamudi R, Brann D. Estrogen neuro- protection and the critical period hypothesis. Front Neuroendocrinol 2012; 33: 85-104.

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Authors
Zhang, Q.-G., Wang, R.-M., Scott, E., Han, D., Dong, Y., Tu, J.-Y., Yang, F., Reddy Sareddy, G., Vadlamudi, R. K., & Brann, D. W.
Affiliations
  • Augusta University (US)
  • North China University of Science and Technology (CN)
  • The University of Texas at San Antonio Health Science Center (US)
Venue
Brain
Published
2013-03-09
Volume
136
Issue
5
Pages
1432-1445
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2081861881
Cited by
50
References
49
Citations by year
2026: 2 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 2 · 2020: 5 · 2019: 7 · 2018: 6 · 2017: 5 · 2016: 5 · 2015: 4 · 2014: 6 · 2013: 1
FWCI
3.71
Type
journal article
Language
en
Open access
Locations
  • Brain (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association (10SDG256009)
  • National Institutes of Health (NS050730)
  • National Institute of Neurological Disorders and Stroke (NS050730, R01NS050730)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
Keywords
surgical menopause, bilateral oophorectomy, estrogen deprivation, hippocampal CA3, stress-induced neurodegeneration, amyloidogenesis, amyloid-beta 42, Alzheimer's disease, NADPH oxidase, superoxide, c-Jun N-terminal kinase, estrogen replacement therapy, sex differences, cognitive decline
MeSH terms
Animals, Female, Male, Menopause, Nerve Degeneration, Ovariectomy, Peptide Fragments, Stress, Physiological, Amyloid beta-Peptides, Rats, Sprague-Dawley, Models, Animal, Rats, CA3 Region, Hippocampal

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