Cited by 86Neuroinflammation and Neurodegeneration MechanismsNeurogenesis and neuroplasticity mechanismsNeurological Disease Mechanisms and Treatments

Effect of aging on the microglial response to peripheral nerve injury

Conde, Jessica R., Streit, Wolfgang J.·2006·Neurobiology of Aging

Abstract

Microglial morphology and immunophenotype have been studied extensively in aging-related neurodegenerative diseases, but to a lesser extent in the normally aged CNS, and little is known about how aging affects the ability of microglia to respond to neuronal injury. The goal of the current study was to determine if aging affects the ability of microglia to divide during the early response to facial nerve axotomy. In addition, we investigated the incidence of microglial cell death during later post-axotomy time points to determine if aging had an effect on microglial turnover. We employed DNA labeling with 3H-thymidine, TUNEL and lectin histochemistry after facial nerve axotomy in young (3 months), middle-aged (15 months), and old (30 months) Fisher344-Brown Norway hybrid rats. Proliferation of microglia in old rats remained significantly higher than in young rats 4 days after injury, suggesting that regulation of microglial proliferation changes with aging. There was no aging-related difference in microglial TUNEL staining at 7, 14 or 21 days post-axotomy. Lectin histochemistry in the unoperated facial nucleus revealed aging-related morphological changes in resting microglia, including hypertrophy of the cytoplasm with dense perinuclear staining. Aging-related differences in activated microglia on the lesioned side were more subtle, although many activated microglia of aged animals continued to exhibit dense perinuclear lectin reactivity. We propose that aging-related changes in morphology in conjunction with a less regulated proliferative response in the aged facial nucleus may be a reflection of microglial senescence.

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Crossref · 10.1016/j.neurobiolaging.2005.07.012

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Authors
Conde, J. R., & Streit, W. J.
Affiliations
University of Florida (US)
Corresponding author
Streit, Wolfgang J.
Venue
Neurobiology of Aging
Publisher
Elsevier BV
Published
2006-10
Volume
27
Issue
10
Pages
1451-1461
ISSN
0197-4580 (ISSN-L)
OpenAlex
W1991963544
Cited by
86
References
57
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2023: 3 · 2022: 6 · 2021: 5 · 2020: 4 · 2019: 2 · 2018: 2 · 2017: 4 · 2016: 6 · 2015: 8 · 2014: 7 · 2013: 4 · 2012: 9
FWCI
1.41
Type
journal article
Language
en
Open access
closed
Locations
  • Neurobiology of Aging (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Evelyn F. McKnight Brain Research Foundation
  • University of Florida
  • National Institutes of Health
  • National Institute on Aging (R01AG023665, AG 023665)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
microglia, aging, peripheral nerve injury, facial nerve axotomy, microglial proliferation, microglial cell death, microglial senescence, microglial morphology, microglial activation, facial nucleus
MeSH terms
Aging, Animals, Facial Nerve Diseases, Male, Peripheral Nervous System Diseases, Rats, Inbred F344, Apoptosis, Microglia, Rats

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