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Journal of Endocrinology (1978) 77, 137-141    DOI: 10.1677/joe.0.0770137
© 1978 Society for Endocrinology

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POSSIBLE ROLE OF GAMMA-AMINOBUTYRIC ACID SYNTHESIS IN THE MECHANISM OF DEXAMETHASONE FEEDBACK ACTION

Z. ÁCS and E. STARK

Specific inhibition of glutamic acid decarboxylase (GAD, EC 4.1.1.1 [EC] 5; the main enzyme involved in the synthesis of {gamma}-aminobutyric acid) by mercaptopropionic acid interferes with the effect of dexamethasone on both the resting and stress-induced secretion of ACTH. It is postulated that dexamethasone may, at least in part, inhibit the secretion of ACTH via the induction of GAD, thereby raising the level of {gamma}-aminobutyric acid in the central nervous system.




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L. B. Mercado-Asis, J. A. Yanovski, H. L. Tracer, C. L. Chik, and G. B. Cutler Jr.
Acute Effects of Bromocriptine, Cyproheptadine, and Valproic Acid on Plasma Adrenocorticotropin Secretion in Nelson's Syndrome
J. Clin. Endocrinol. Metab., February 1, 1997; 82(2): 514 - 517.
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