Cited by 396Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Locus coeruleus neurofibrillary degeneration in aging, mild cognitive impairment and early Alzheimer's disease

Grudzien, Aneta, Shaw, Pamela, Weintraub, Sandra, Bigio, Eileen, Mash, Deborah C., Mesulam, M. Marsel·2007·Neurobiology of Aging

Abstract

Neurofibrillary degeneration in the nucleus basalis and a loss of its cortical cholinergic projections are prominent components of the neuropathology in Alzheimer's disease (AD). The AD brain is also associated with a degeneration of the noradrenergic projections arising from the nucleus locus coeruleus (LC), but the time course of this lesion is poorly understood. To determine whether the LC displays neurofibrillary abnormalities early in the course of events leading to AD, we examined tissue specimens from seven cognitively normal controls and five subjects at the stages of mild cognitively impairment (MCI) or early AD. Tyrosine hydroxylase immunochemistry was used as a marker of LC neurons while AT8 immunolabeling visualized abnormal tau associated with neurofibrillary tangles and their precursors. Thioflavine-S was used as a marker for fully developed tangles. We found that AT8-positive labeling and thioflavine-S positive tangles were present in both groups of specimens. However, the percentage of neurons containing each of these markers was significantly higher in the cognitively impaired group. The MMSE scores displayed a negative correlation with both markers of cytopathology. These results indicate that cytopathology in the LC is an early event in the age-MCI-AD continuum and that it may be listed among the numerous factors that mediate the emergence of the cognitive changes leading to dementia.

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Crossref · 10.1016/j.neurobiolaging.2006.02.007

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Authors
Grudzien, A., Shaw, P., Weintraub, S., Bigio, E., Mash, D. C., & Mesulam, M. M.
Affiliations
  • Northwestern University (US)
  • University of Miami (US)
Corresponding author
Mesulam, M. Marsel
Venue
Neurobiology of Aging
Publisher
Elsevier BV
Published
2007-03
Volume
28
Issue
3
Pages
327-335
ISSN
0197-4580 (ISSN-L)
OpenAlex
W2168697938
Cited by
396
References
45
Citations by year
2026: 17 · 2025: 21 · 2024: 19 · 2023: 31 · 2022: 19 · 2021: 40 · 2020: 30 · 2019: 16 · 2018: 15 · 2017: 28 · 2016: 18 · 2015: 22 · 2014: 18 · 2013: 20 · 2012: 20
FWCI
6.74
Type
journal article
Language
en
Open access
closed
Locations
  • Neurobiology of Aging (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Miami
  • Northwestern University
  • National Institute on Aging (P30AG013854)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
locus coeruleus, neurofibrillary degeneration, Alzheimer's disease, mild cognitive impairment, aging, tau protein, neurofibrillary tangles, noradrenergic projections, AT8, thioflavine S, tyrosine hydroxylase, cognitive decline, dementia
MeSH terms
Acetylcholinesterase, Aged, Aged, 80 and over, Aging, Alzheimer Disease, Cognition Disorders, Female, Humans, Immunohistochemistry, Locus Coeruleus, Male, Middle Aged, Postmortem Changes, Psychological Tests, Reference Values, Tyrosine 3-Monooxygenase, Neurofibrillary Tangles, tau Proteins, Statistics, Nonparametric

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