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Related Experiment Videos

Barbiturates impair astrocyte glutamate uptake

R A Swanson1, L L Seid

  • 1Department of Neurology, Veterans Affairs Medical Center and University of California, San Francisco 94121, USA. ray@itsa.ucsf.edu

Glia
|November 14, 1998
PubMed
Summary

Barbiturates, used for neuroprotection, may harm brain cells by impairing glutamate uptake, especially during low glucose. This study investigated barbiturate effects on glutamate transport in astrocytes.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Pharmacology

Background:

  • Barbiturates are clinically used for neuroprotection, particularly during status epilepticus and cerebral ischemia.
  • Their neuroprotective efficacy is debated, as they may inhibit mitochondrial ATP production, crucial for neuronal function.
  • Impaired mitochondrial ATP could compromise energy-dependent processes like glutamate uptake.

Purpose of the Study:

  • To investigate the impact of barbiturates on glutamate uptake in primary rat astrocyte cultures.
  • To determine if barbiturates impair energy-dependent glutamate transport, particularly under conditions of metabolic stress (glucose deprivation).

Main Methods:

  • Primary rat astrocyte cultures were utilized to measure glutamate uptake rates.
  • The effects of various barbiturates on glutamate uptake were assessed at normal glucose concentrations and during glucose deprivation.
  • Mitochondrial ATP levels were measured to correlate with glutamate uptake inhibition.

Main Results:

  • Barbiturates exhibited varied effects on glutamate uptake at normal glucose levels.
  • All tested barbiturates potentiated the inhibition of glutamate uptake during glucose deprivation.
  • Thiamylal and thiopental demonstrated the most potent inhibition, reducing uptake by approximately 40% at 0.3 mM.
  • Barbiturates exacerbated ATP depletion during glucose deprivation, supporting mitochondrial dysfunction as the mechanism.

Conclusions:

  • Barbiturates can impair energy-dependent glutamate uptake in astrocytes, particularly under metabolic stress.
  • This impairment is linked to barbiturate-induced mitochondrial ATP production inhibition.
  • Findings suggest potential adverse effects of barbiturates on neuronal function at clinically relevant concentrations.

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