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Traumatic injury induces differential expression of cell death genes in organotypic brain slice cultures determined
B Morrison1, J H Eberwine, D F Meaney
1Department of Bioengineering, University of Pennsylvania, Philadelphia 19104, USA.
Abstract:
The expression of a large panel of selected genes hypothesized to play a central role in post-traumatic cell death was shown to be differentially altered in response to a precisely controlled, mechanical injury applied to an organotypic slice culture of the rat brain. Within 48 h of injury, the expression of nerve growth factor messenger RNA was significantly increased whereas the levels of bcl-2, alpha-subunit of calcium/calmodulin-dependent protein kinase II, cAMP response element binding protein, 65,000 mol. wt isoform of glutamate decarboxylase, 1beta isoform of protein kinase C, and ubiquitin messenger RNA were significantly decreased. Because the expression levels of a number of other messenger RNAs such as the neuron-specific amyloid precursor protein, beta(2) microglobulin, bax, bcl(xl), brain-derived neurotrophic factor, cyclooxygenase-2, interleukin-1beta, interleukin-6, tumor necrosis factor-alpha, receptor tyrosine kinase A, and receptor tyrosine kinase B were unaffected, these selective changes may represent components of an active and directed response of the brain initiated by mechanical trauma. Interpretation of these co-ordinated alterations suggests that mechanical injury to the central nervous system may lead to disruption of calcium homeostasis resulting in altered gene expression, an impairment of intracellular cascades responsible for trophic factor signaling, and initiation of apoptosis via multiple pathways. An understanding of these transcriptional changes may contribute to the development of novel therapeutic strategies to enhance beneficial and blunt detrimental, endogenous, post-injury response mechanisms.
Insights
Mechanical brain injury alters gene expression, affecting cell death pathways. Understanding these changes in nerve growth factor and apoptosis-related genes may guide new therapeutic strategies for central nervous system trauma.
Area of Science:
- Neuroscience
- Molecular Biology
- Traumatic Brain Injury Research
Background:
- Mechanical injury to the brain can trigger complex cellular responses.
- Gene expression changes are critical in mediating post-traumatic cell death and survival.
Purpose of the Study:
- To investigate the differential gene expression patterns following mechanical brain injury.
- To identify key genes involved in the brain's response to trauma and cell death.
Main Methods:
- Utilized organotypic slice cultures of rat brain subjected to controlled mechanical injury.
- Analyzed the expression levels of a selected panel of genes, including messenger RNAs, within 48 hours post-injury.
Main Results:
- Observed a significant increase in nerve growth factor messenger RNA expression.
- Documented significant decreases in messenger RNA levels for bcl-2, calcium/calmodulin-dependent protein kinase II, cAMP response element binding protein, glutamate decarboxylase, protein kinase C, and ubiquitin.
- Found no significant changes in other tested messenger RNAs, indicating a selective response.
Conclusions:
- Selective gene expression changes suggest an active, directed brain response to mechanical trauma.
- Post-traumatic alterations may involve disrupted calcium homeostasis, impaired trophic factor signaling, and apoptosis initiation.
- Understanding these transcriptional changes could lead to novel therapeutic strategies for CNS injury.