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Increased glutamine synthetase immunoreactivity in experimental pneumococcal meningitis
A K Stringaris1, W Brück, H Tumani
1Department of Neurology, Georg-August-University, Göttingen, Germany.
Acta Neuropathologica
|March 1, 1997
Summary
Pneumococcal meningitis increased glutamine synthetase in the cortex, potentially protecting neurons. However, hippocampal glutamine synthetase failed to prevent glutamate damage, leading to apoptosis in the dentate gyrus.
Area of Science:
- Neuroscience
- Pathology
- Immunohistochemistry
Background:
- Bacterial meningitis, such as pneumococcal meningitis, can cause significant neurological damage.
- Glutamate excitotoxicity is a key mechanism implicated in neuronal death during meningitis.
- Glutamine synthetase (GS) plays a crucial role in regulating glutamate homeostasis.
Purpose of the Study:
- To investigate the role of glutamine synthetase (GS) and glial fibrillary acidic protein (GFAP) in a rabbit model of pneumococcal meningitis.
- To evaluate the impact of meningitis on GS and GFAP expression in different brain regions.
- To explore the relationship between GS activity and neuronal apoptosis in the context of meningitis.
Main Methods:
- A rabbit model of pneumococcal meningitis was established.
- Immunohistochemistry was used to assess the expression of GS and GFAP.
- Neuronal apoptotic cell death was quantified.
Main Results:
- Pneumococcal meningitis led to increased GS immunoreactivity in the cerebral cortex.
- GS immunoreactivity did not change in the hippocampal formation.
- GFAP immunoreactivity remained unchanged in both regions.
- Neuronal apoptosis was observed in the dentate gyrus of the hippocampus.
Conclusions:
- Increased cortical GS may represent a protective response against glutamate toxicity during meningitis.
- The hippocampus's limited capacity to upregulate GS may contribute to neuronal apoptosis in the dentate gyrus due to glutamate excitotoxicity.
- These findings highlight regional differences in glial responses to meningitis and their implications for neuronal survival.