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Low CSF GABA concentration in children with febrile convulsions, untreated epilepsy, and meningitis
Insights
In children, low levels of gamma-aminobutyric acid (GABA) in cerebrospinal fluid (CSF) were linked to seizures. Valproate treatment significantly increased CSF GABA levels in epileptic children.
Area of Science:
- Neuroscience
- Biochemistry
- Pediatrics
Background:
- Gamma-aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the central nervous system (CNS).
- Alterations in GABAergic neurotransmission are implicated in various neurological disorders, including epilepsy.
Purpose of the Study:
- To investigate gamma-aminobutyric acid (GABA) concentrations in the cerebrospinal fluid (CSF) of children with epilepsy, febrile convulsions, and meningitis.
- To explore the relationship between GABA levels, seizure activity, and valproate treatment.
Main Methods:
- Lumbar CSF samples were collected from children diagnosed with epilepsy, febrile convulsions, meningitis, and from a control group.
- CSF GABA concentrations were quantified using established biochemical assays.
- Statistical analysis was performed to compare GABA levels across different patient groups and controls.
Main Results:
- Mean CSF GABA concentrations were unchanged in epileptic children compared to controls, but two children on valproate showed exceptionally high GABA levels.
- Untreated epileptic children exhibited significantly lower CSF GABA concentrations.
- Children with febrile convulsions and acute meningitis also demonstrated significantly decreased CSF GABA levels compared to controls.
Conclusions:
- Valproate treatment dramatically increases GABA concentrations in the CSF of epileptic children.
- Reduced GABAergic activity in the CNS may contribute to increased seizure frequency.
- CSF GABA levels may serve as a biomarker for certain neurological conditions in children.
Abstract:
In 14 children with epilepsy, 51 with febrile convulsions and 22 with meningitis gamma-aminobutyric acid (GABA) concentrations in lumbar CSF were determined. While the mean for CSF GABA concentrations for all epileptic children was unchanged [144 (range: 73-285) pmol/ml; controls: 148 (range: 90-243) pmol/ml] extraordinarily high GABA levels were found in the CSF of two children on valproate (525 and 557 pmol/ml) and remarkably low GABA concentrations in hitherto untreated epileptic children [109 (range: 67-176) pmol/ml]. Children with febrile convulsions [103 (range: 63-170) pmol/ml] and acute meningitis [105 (range: 65-171) pmol/ml] had significantly decreased CSF GABA concentrations (P less than 0.001 and P less than 0.02 compared with controls). The data indicate that valproate intake increases dramatically the GABA concentrations in the CSF of epileptic children. Furthermore, the study supports the concept that low GABAergic activity within the CNS may be one cause for an increased seizure frequency.