The Mechanism of Cyanohydroxybutene Induced Glutathione Elevation: The Role of Gamma-Glutamylcysteine Synthetase
Davis, Myrtle A.
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https://hdl.handle.net/2142/72554
Description
Title
The Mechanism of Cyanohydroxybutene Induced Glutathione Elevation: The Role of Gamma-Glutamylcysteine Synthetase
Author(s)
Davis, Myrtle A.
Issue Date
1992
Doctoral Committee Chair(s)
Jeffery, E.,
Department of Study
Veterinary Medical Science
Discipline
Veterinary Medical Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Health Sciences, Toxicology
Biology, Veterinary Science
Abstract
Cyanohydroxybutene (CHB; 200 mg/kg po) causes a 2- and 7-fold elevation in glutathione (GSH) in liver and pancreas, respectively. The mechanism of elevation is currently unknown. In an attempt to identify the mechanism of this GSH induction, the effect of CHB on hepatic and pancreatic $\gamma$-glutamylcysteine synthetase (GCS) activity, formation in vitro of a glutathione-S-transferase (GST) catalyzed adduct, the effect of CHB on hepatic and pancreatic cysteine equivalents (cysteine, cystine, and cysteinylglycine), and the acute effect of CHB on expression of the hepatic mRNA for $\gamma$-glutamylcysteine synthetase (GCS) were investigated. The results of these studies suggest that the mechanism of CHB-mediated induction of GSH involves an increase in GCS mRNA producing an increase in GCS enzyme and thereby increasing GSH synthesis. This mechanism and the subsequent GSH elevation may have possible therapeutic and prophylactic implications.
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