Document Detail


Binding of RU486 and deacylcortivazol to the glucocorticoid receptor is insensitive to sulfhydryl-modifying agents.
MedLine Citation:
PMID:  8461255     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The differential sensitivity of the rat liver glucocorticoid receptor (GR) to sulfhydryl group modifying agents when bound to various agonist and antagonist ligands was studied. [3H]Triamcinolone acetonide (TA) binding was completely abolished by previous treatment of the unbound receptor with various N-alkylmaleimides. On the contrary, [3H]RU486 binding was only slightly affected by treatment with N-ethylmaleimide (NEM) and more significantly decreased with maleimides bearing bulky substituents. Ligand exchange experiments demonstrated that, unlike the agonist TA, the antiglucocorticoid RU486 was unable to protect the GR binding site from the effect of NEM. This lack of protection would seem to be due to the presence of the bulky 11 beta-substituent in RU486 since RU26988 and RU28362, two 11 beta hydroxylated glucocorticoids bearing the same 17 alpha-propynyl side chain as RU486 but lacking the 11 beta-substituent could protect GR against NEM. The ability of a GR ligand to prevent NEM inactivation of TA binding appeared unrelated to its agonist or antagonist nature: deacylcortivazol, a potent agonist, afforded no protection whereas antagonists of the 17 beta-carboxamide series did. These data strongly suggest that compounds bearing bulky substituents on the steroid A and/or C rings, like deacylcortivazol and RU486, are positioned differently from canonical glucocorticoids in the steroid binding groove of the GR.
Authors:
T Burollaud; P M Danzé; N Tbarka; P Formstecher; M Dautrevaux
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of steroid biochemistry and molecular biology     Volume:  44     ISSN:  0960-0760     ISO Abbreviation:  J. Steroid Biochem. Mol. Biol.     Publication Date:  1993 Mar 
Date Detail:
Created Date:  1993-04-30     Completed Date:  1993-04-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9015483     Medline TA:  J Steroid Biochem Mol Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  217-25     Citation Subset:  IM    
Affiliation:
Laboratoire de Biochimie Structurale, Faculté de Médecine, Lille, France.
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MeSH Terms
Descriptor/Qualifier:
Alkylation
Androstanols / metabolism
Animals
Binding, Competitive
Ethylmaleimide / pharmacology
Liver / metabolism
Male
Maleimides / pharmacology
Mifepristone / metabolism*
Pregnatrienes / metabolism*
Rats
Rats, Wistar
Receptors, Glucocorticoid / drug effects,  metabolism*
Structure-Activity Relationship
Sulfhydryl Reagents / pharmacology*
Triamcinolone Acetonide / metabolism
Chemical
Reg. No./Substance:
0/Androstanols; 0/Maleimides; 0/Pregnatrienes; 0/Receptors, Glucocorticoid; 0/Sulfhydryl Reagents; 128-53-0/Ethylmaleimide; 4906-84-7/deacylcortivazol; 74915-58-5/RU 26988; 74915-64-3/11,17-dihydroxy-6-methyl-17-(1-propynyl)androsta-1,4,6-triene-3-one; 76-25-5/Triamcinolone Acetonide; 84371-65-3/Mifepristone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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