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Excitatory amino acids in cerebrospinal fluid in neonatal asphyxia
R S Riikonen1, P O Kero, O G Simell
1Department of Child Neurology, University of Helsinki, Finland.
Insights
Severe neonatal asphyxia elevates aspartic acid levels in infant cerebrospinal fluid, indicating a potential biomarker for injury severity. Glutamic acid levels showed variability.
Area of Science:
- Neurochemistry
- Neonatal Medicine
- Clinical Toxicology
Background:
- Neonatal asphyxia is a critical event leading to potential neurological damage.
- Excitatory amino acids, including glutamic and aspartic acid, play roles in neuronal function and excitotoxicity.
- Cerebrospinal fluid (CSF) analysis can provide insights into biochemical changes following hypoxic-ischemic events.
Purpose of the Study:
- To investigate the concentrations of glutamic and aspartic acid in the CSF of infants following severe neonatal asphyxia.
- To determine if these amino acid levels correlate with the timing and severity of the asphyxial event and patient outcomes.
Main Methods:
- Analysis of cerebrospinal fluid samples from six infants within 4-32 hours post-neonatal asphyxia.
- Quantification of glutamic acid and aspartic acid concentrations using biochemical assays.
- Correlation of amino acid levels with the time elapsed since the asphyxial episode and clinical outcomes.
Main Results:
- Aspartic acid concentrations were consistently elevated in the CSF of infants after severe neonatal asphyxia.
- Glutamic acid concentrations exhibited significant variability among the studied infants.
- Elevated aspartic acid levels were observed even several hours after the asphyxial event, with higher concentrations noted within 12 hours.
- A positive correlation was found between higher CSF aspartic acid levels and more severe patient outcomes.
Conclusions:
- Aspartic acid in CSF is a potential biomarker for the severity of brain injury resulting from neonatal asphyxia.
- The persistent elevation of aspartic acid suggests ongoing excitotoxic processes.
- Monitoring CSF aspartic acid may aid in predicting neurological outcomes in affected infants.
Abstract:
Of the excitatory amino acids, glutamic and aspartic acid were studied in the cerebrospinal fluid of six infants 4-32 hours after a documented episode of severe neonatal asphyxia. Aspartic acid concentration was definitely increased in the cerebrospinal fluid of these patients, whereas glutamic acid concentration varied considerably. Aspartic acid was always increased, even hours after the period of asphyxia, but values were greater in samples taken less than 12 hours after the asphyxial event. The patients with the highest cerebrospinal fluid aspartic acid concentrations had more severe outcomes.