Gabaergic modulation of the stress response in frontal cortex and amygdala

Synapse
Irene D MartijenaVictor A Molina

Abstract

GABAergic neurotransmission is thought to play an important role in the modulation of the central response to stress. In the present study we evaluate the influence of a brief restraint exposure on GABA-stimulated chloride influx in diverse brain areas presumed to have a major role in the mediation of emotional behaviors following aversive stimulation. A reduced chloride uptake after stress exposure was only observed in frontal cortex and amygdala. Moreover, rats subjected to such stressor performed an anxiogenic behavior when exposed later to the elevated plus-maze. A comparable behavior in the elevated plus-maze was observed between animals that were allowed to chew during the restraint experience and those without any stressful manipulation, suggesting that chewing served as an efficient coping behavioral strategy during such threatening situations. In order to explore if chewing during the restraint experience could suppress the reduction in GABA-stimulated chloride uptake induced by this stressor, rats were allowed or not to chew during restraint and in both cases GABA-stimulated chloride influx was assayed in frontal cortex and amygdala. The finding of this experiment showed that restrained rats that have the possibility ...Continue Reading

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Related Concepts

Chloride Ion Level
Adrenal Cortex Diseases
Organum Vasculosum Laminae Terminalis
Mental Suffering
GABA-A Receptor gamma Subunit
Structure of Broca's Area
Structure of Subiculum Hippocampi
Physical Restraint
Gamma-Aminobutyric Acid, Zinc Salt (2:1)
Rats, Wistar

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