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Gene expression in cortex and hippocampus during acute pneumococcal meningitis
Roney S Coimbra1, Veronique Voisin, Antoine B de Saizieu
1Institute for Infectious Diseases, University of Bern, Friedbühlstrasse 51, CH-3010, Bern, Switzerland. roney.s.coimbra@gsk.com
BMC Biology
|June 6, 2006
Summary
Pneumococcal meningitis causes brain damage. This study identified specific gene expression patterns in the infant rat brain, revealing potential therapeutic targets for neurological sequelae.
Area of Science:
- Neuroscience
- Genomics
- Infectious Disease
Background:
- Pneumococcal meningitis has high mortality and causes significant neurological damage in survivors, particularly affecting the cortex and hippocampus.
- The genetic basis of host response leading to brain injury in bacterial meningitis remains largely unknown.
- Current understanding of the host's genetic response to pneumococcal meningitis is limited.
Purpose of the Study:
- To investigate the gene expression profiles in the infant rat brain during pneumococcal meningitis.
- To identify the genetic programs regulating host response and brain damage.
- To uncover potential therapeutic targets for neurological sequelae.
Main Methods:
- Utilized an infant rat model of pneumococcal meningitis.
- Assessed gene expression in cortex and hippocampus using Affymetrix DNA microarrays at 22 and 44 hours post-infection.
- Employed a bioinformatics pipeline combining literature profiling and self-organizing maps (SOM) for data analysis.
Main Results:
- Identified 598 differentially regulated genes, with 77% assigned to functional groups.
- Disclosed six distinct patterns of gene expression kinetics.
- Observed upregulation of genes related to growth, neuroplasticity, signal transduction, cell death/survival, cytoskeleton, and immunity.
- Noted transient downregulation of genes involved in neurotransmission and lipid metabolism.
- Found differential regulation of ionic homeostasis, neurotransmission, signal transduction, and lipid metabolism genes predominantly in the hippocampus.
- Observed contrasting regulation of cell death/survival genes: pro-apoptotic in hippocampus and anti-apoptotic in cortex.
Conclusions:
- Temporal and spatial gene expression analysis in experimental pneumococcal meningitis provides insights into the host's response.
- Identified specific genes and pathways that are differentially regulated in the brain.
- These findings highlight potential therapeutic targets for mitigating brain damage and neurological sequelae associated with pneumococcal meningitis.