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Microglial cells prevent nitric oxide-induced neuronal apoptosis in vitro
1Department of Physiology, School of Medicine, Ehime University, Shigenobu, Japan.
Journal of Neuroscience Research
|August 26, 1998
Summary
Microglial cells protect neurons from nitric oxide (NO)-induced apoptosis by secreting both heat-labile and heat-stable factors. This neuroprotective effect was observed in vitro, suggesting a key role for microglia in preventing neuronal death.
Area of Science:
- Neuroscience
- Cell Biology
- Immunology
Background:
- Apoptotic neuronal death is implicated in brain development and neurological disorders.
- The role of activated microglial cells in modulating neuronal apoptosis remains unclear.
Purpose of the Study:
- To investigate the involvement of microglial cells in nitric oxide (NO)-induced neuronal apoptosis.
- To identify potential neuroprotective factors secreted by microglia.
Main Methods:
- Primary rat cortical neurons were treated with a nitric oxide donor (SNP) to induce apoptosis.
- Neurons were co-cultured with primary microglial cells or treated with microglia-conditioned medium.
- Apoptosis was assessed by morphological changes, DNA fragmentation, and the effects of specific cytokines and proteins.
Main Results:
- Nitric oxide (NO) induced apoptosis in cultured neurons, characterized by nuclear and DNA fragmentation.
- Co-culture with microglia or treatment with microglia-conditioned medium prevented NO-induced neuronal death.
- While some known microglial factors (e.g., TNF-α, plasminogen) showed partial effects, heat-stable and heat-labile factors in conditioned medium conferred significant neuroprotection.
Conclusions:
- Microglial cells secrete both heat-labile and heat-stable factors that protect neurons against NO-induced apoptosis.
- These findings highlight a crucial neuroprotective role for microglia in vitro, potentially relevant to neurological conditions involving NO-mediated neuronal damage.