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Hormone mediated changes of brain glutamic acid system in amino acid imbalance.

The effects of adrenal cortical hormone and thyroxine on brain glutamic acid, gamma-amino butyric acid (GABA) and glutamine were studied in rats fed on the amino acid imbalanced diet (8% casein diet supplemented with 0.3% L-threonine). The studies revealed that the decrease in brain glutamic acid and GABA levels in threonine imbalance was recovered by hydrocortisone supplementation. The increased level of brain glutamine in threonine imbalance could not, however, be reversed by hydrocortisone supplementation. Thyroxine supplementation was found to have no impact on any of the members of glutamic acid family in the brain of rats receiving the threonine-imbalanced diet. It was suggested that the decreased levels of brain glutamic acid and GABA in threonine imbalance were caused by diminished adrenal cortical function and the influence of adrenal cortical hormone could be suggested to reside at the level of formation of both glutamic acid and GABA.