Document Detail

Inhibition of mercapturic acid pathway-mediated disposal of 4-hydroxynonenal causes complete and sustained remission of human cancer xenografts in nude mice.
MedLine Citation:
PMID:  22126012     Owner:  NLM     Status:  In-Process    
Environmental electrophilic chemical carcinogens are detoxified via mercapturic acid pathway to be excreted as mercapturic acid derivatives. Mercapturic acid pathway is also involved in the metabolism of pro-apoptotic and toxic endogenous electrophiles such as 4-hydroxynonenal (HNE). HNE is a common denominator in stress induced signaling and is a pro-apoptotic second messenger that affects cell cycle signaling in a concentration dependent manner. It can regulate signaling for apoptosis, differentiation, and gene expression by interacting with the transcriptional factors, transcriptional repressors, membrane receptors and other proteins. First two rate limiting enzymes of the mercapturic acid pathway, GSTs that conjugate HNE to glutathione (GSH), and RLIP76 that excludes GHS-HNE conjugate from cells, regulate the intracellular concentration of HNE. Thus GSTs and RLIP76 can have a profound effect on cell cycle signaling. Our studies have established that increased HNE levels in cells promote apoptotic signaling while at decreased levels below its basal constituted levels HNE promote proliferation. A major outcome of these findings is that by blocking the mercapturic acid pathway mediated detoxification of HNE through the inhibition of RLIP76 catalyzed transport of GS-HNE, a complete remission of many human cancer xenografts in mice can be achieved.
Sushil Kumar; Rutika A Kokate; Mukesh Sahu; Pankaj Chaudhary; Rajendra Sharma; Sanjay Awasthi; Yogesh C Awasthi
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Indian journal of experimental biology     Volume:  49     ISSN:  0019-5189     ISO Abbreviation:  Indian J. Exp. Biol.     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0233411     Medline TA:  Indian J Exp Biol     Country:  India    
Other Details:
Languages:  eng     Pagination:  817-25     Citation Subset:  IM    
Department of Molecular Biology and Immunology, University of North Texas Health Science Center, 3500 Camp Bowie Boulevard, Fort Worth, TX 76107, USA.
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