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Acute stress and GABAergic function in the rat brain.

M E Otero Losada1

  • 1Instituto de Investigaciones Farmacológicas (ININFA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.

British Journal of Pharmacology
|March 1, 1989
PubMed
Summary

Acute stress impacts the brain

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Area of Science:

  • Neuroscience
  • Neurochemistry

Background:

  • The gamma-aminobutyric acid (GABA)-ergic system plays a crucial role in regulating neuronal activity.
  • Understanding how acute stress affects neurotransmitter systems is vital for comprehending stress-related behaviors.

Purpose of the Study:

  • To investigate the functional changes in the GABA-ergic system in specific rat brain regions following acute immobilization stress.
  • To determine the neurochemical alterations induced by short-term stress exposure.

Main Methods:

  • Measurement of glutamate decarboxylase and GABA-transaminase activities.
  • Quantification of GABA concentrations and in vivo GABA turnover.
  • Assessment of [3H]-GABA uptake in brain tissue samples.

Main Results:

  • Acute stress (5 min) reduced GABA concentrations and [3H]-GABA uptake while stimulating GABA turnover in olfactory bulbs.
  • Immobilization stress increased [3H]-GABA uptake in the corpus striatum.
  • No significant alterations were observed in the frontal cortex, hippocampus, or medio-basal hypothalamus.

Conclusions:

  • The olfactory bulbs and corpus striatum are sensitive brain regions to acute stress.
  • Neurochemical changes in GABAergic pathways, particularly in the olfactory bulbs, may underlie stress-induced behavioral changes like aggression and heightened emotional states.

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