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Modulation of NO and cytokines in microglial cells by Cu/Zn-superoxide dismutase
1Department of Biochemistry, National Defense Medical Center, Taipei, Taiwan.
Abstract:
The activation of microglial cells in response to neuropathological stimuli is one of the prominent features of human neurodegenerative diseases. Cytokines such as IL-1 beta and TNF-alpha and inflammation-related enzymes such as inducible nitric oxide synthase are usually induced during the activation of microglial cells. We investigated the modulation of the activation of microglial cell by transfecting a Cu/Zn-SOD cDNA into BV-2 cells. Parental and transfected BV-2 cells were then subjected to LPS stimulation. The results showed that in Cu/Zn-SOD-transfected BV-2 cells, the expression and activity of Cu/Zn-SOD increased. On the other hand, upon activation by LPS, these cells produced less NO, IL-1 beta, and TNF-alpha than the parental microglial cells. This finding suggests that superoxide may be an early signal triggering the induction of cytokines and that the transfected Cu/Zn-SOD may provide a neuroprotective function via suppression of microglial activation. In addition, this approach may provide a rationale for the development of treatments for neurodegenerative diseases.
Insights
Transfecting BV-2 cells with Cu/Zn-SOD cDNA suppressed microglial activation. This suggests copper-zinc superoxide dismutase (Cu/Zn-SOD) offers neuroprotection by reducing inflammatory responses in neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
- Molecular Biology
Background:
- Microglial cell activation is a hallmark of neurodegenerative diseases.
- Activated microglia release inflammatory cytokines like IL-1 beta and TNF-alpha.
- Inflammation-related enzymes, such as inducible nitric oxide synthase, are also induced.
Purpose of the Study:
- To investigate the modulation of microglial activation using Cu/Zn-SOD cDNA transfection.
- To determine the effect of Cu/Zn-SOD on inflammatory responses in microglia.
- To explore the potential neuroprotective role of Cu/Zn-SOD.
Main Methods:
- Transfection of BV-2 microglial cells with Cu/Zn-SOD cDNA.
- Stimulation of parental and transfected BV-2 cells with lipopolysaccharide (LPS).
- Measurement of Cu/Zn-SOD expression and activity, and production of NO, IL-1 beta, and TNF-alpha.
Main Results:
- Cu/Zn-SOD expression and activity were increased in transfected BV-2 cells.
- LPS-stimulated transfected cells produced significantly less NO, IL-1 beta, and TNF-alpha compared to parental cells.
- Superoxide may act as an early signal for cytokine induction.
Conclusions:
- Transfected Cu/Zn-SOD demonstrates neuroprotective function by suppressing microglial activation.
- This approach offers a potential therapeutic strategy for neurodegenerative diseases.
- Targeting superoxide signaling could be a novel treatment avenue.