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Interleukin-1, nitric oxide and reactive astrocytes
S C Lee1, D W Dickson, C F Brosnan
1Department of Pathology (Neuropathology), Albert Einstein College of Medicine, Bronx, New York 10461, USA.
Brain, Behavior, and Immunity
|December 1, 1995
Summary
Interleukin-1 (IL-1) activates human astrocytes, leading to the production of inflammatory cytokines and nitric oxide. Activated astrocytes also enhance microglial growth, suggesting a role for glia in central nervous system diseases.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Cytokines are key mediators in neurological disease inflammation, host defense, and injury.
- Astrocytes and microglia are pivotal in these diseases, producing and responding to cytokines.
- Previous research primarily used rodent models, necessitating studies on human cell systems.
Purpose of the Study:
- To define activating signals for human microglia and astrocytes.
- To investigate human glia responses to cytokines and growth factors.
- To hypothesize glia's role in human central nervous system diseases.
Main Methods:
- Utilized human cell culture systems.
- Investigated astrocyte and microglial responses to activating signals.
- Analyzed cytokine production and nitric oxide generation.
Main Results:
- Interleukin-1 (IL-1) potently activates human astrocytes.
- Activated astrocytes produce tumor necrosis factor alpha and interleukin-6.
- Astrocytes generate nitric oxide and promote microglial growth, enhanced by IL-1.
Conclusions:
- Human astrocytes and microglia are significantly influenced by cytokines like IL-1.
- Activated glia play a crucial role in the inflammatory processes of CNS diseases.
- Further research is needed to elucidate the precise mechanisms of glia involvement in human neurological disorders.