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Traumatic brain injury: developmental differences in glutamate receptor response and the impact on treatment
1Department of Neuroscience, Georgetown University Medical Center, Washington, DC, USA.
Insights
Perinatal brain injury can cause lifelong pediatric disabilities. Glutamate receptors play a key role in neuronal cell death, influencing treatment strategies for brain injury in developing infants.
Area of Science:
- Neuroscience
- Developmental Biology
- Pediatric Neurology
Background:
- Perinatal brain injury from trauma, hypoxia, or ischemia is a major cause of pediatric disabilities.
- Neuronal cell death occurs via necrosis or apoptosis following such injuries.
- Glutamate receptors, including ionotropic (iGluRs) and metabotropic (mGluRs), are implicated in modulating this cell death.
Purpose of the Study:
- To investigate the role of glutamate receptors in perinatal brain injury.
- To understand how developmental age influences glutamate receptor expression and function post-injury.
- To explore potential therapeutic targets for pediatric brain injury.
Main Methods:
- In vivo and in vitro studies examining neuronal cell death mechanisms.
- Analysis of glutamate receptor expression patterns across developmental stages.
- Investigation of the effects of N-methyl-D-aspartate receptor antagonists and group I mGluRs on cell death.
Main Results:
- Glutamate receptor expression varies with developmental age, impacting injury outcomes.
- The developing brain shows increased susceptibility to apoptosis post-injury.
- Caspase-mediated cell death may be worsened by N-methyl-D-aspartate receptor antagonists.
- Group I metabotropic glutamate receptors exhibit differential effects on necrotic versus apoptotic cell death.
Conclusions:
- Understanding developmental changes in glutamate receptor function is crucial for treating perinatal brain injury.
- Targeting specific glutamate receptor pathways may offer novel therapeutic avenues.
- Differential modulation of necrosis and apoptosis by glutamate receptors presents complex treatment considerations.
Abstract:
Perinatal brain injury following trauma, hypoxia, and/or ischemia represents a substantial cause of pediatric disabilities including mental retardation. Such injuries lead to neuronal cell death through either necrosis or apoptosis. Numerous in vivo and in vitro studies implicate ionotropic (iGluRs) and metabotropic (mGluRs) glutamate receptors in the modulation of such cell death. Expression of glutamate receptors changes as a function of developmental age, with substantial implications for understanding mechanisms of post-injury cell death and its potential treatment. Recent findings suggest that the developing brain is more susceptible to apoptosis after injury and that such caspase mediated cell death may be exacerbated by treatment with N-methyl-D-aspartate receptor antagonists. Moreover, group I metabotropic glutamate receptors appear to have opposite effects on necrotic and apoptotic cell death. Understanding the relative roles of glutamate receptors in post-traumatic or post-ischemic cell death as a function of developmental age may lead to novel targeted approaches to the treatment of pediatric brain injury.