Related Experiment Videos
Phenotypic and functional changes in glial cells as a function of age.
Wai H Yu1, Lynle Go, Barbara A Guinn
1Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, ON, Canada.
Neurobiology of Aging
|January 5, 2002
Summary
Aging immune cells, specifically microglia, lose their protective function against neurodegeneration. Aged glial cells show increased inflammatory mediators, contributing to age-related neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
- Aging Research
Background:
- The immune system plays a critical role in age-related neurodegeneration.
- Microglia activation and astrocyte morphology change with age.
- The neuroprotective capacity of glial cells diminishes with age.
Purpose of the Study:
- To investigate the age-related changes in glial cell function.
- To determine the role of immune mediators in age-related neurotoxicity.
- To examine the neuroprotective potential of young versus aged glial cells.
Main Methods:
- Isolation and morphological assessment of microglia and astrocytes from young and aged rats.
- In vitro assessment of glial cell neuroprotective capacity against Abeta toxicity.
- Measurement of nitric oxide and pro-inflammatory cytokine (TNF-alpha, IL-1beta) production.
Main Results:
- Aged microglia exhibited an activated, ameboid morphology, while astrocytes remained quiescent.
- Glial cells from aged rats failed to protect neurons from Abeta toxicity, unlike pup cells.
- Nitric oxide production significantly increased with donor age.
- Basal levels of pro-inflammatory cytokines, including IL-1beta, were elevated in aged glial cells.
Conclusions:
- Aging impairs the neuroprotective functions of microglia and astrocytes.
- Increased production of nitric oxide and pro-inflammatory cytokines by aged glial cells contributes to neurotoxicity.
- These age-related immune alterations may enhance susceptibility to neurodegenerative diseases.