Document Detail


Effect of hydrazine upon vitamin B12-dependent methionine synthase activity and the sulphur amino acid pathway in isolated rat hepatocytes.
MedLine Citation:
PMID:  10230775     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effect of the industrial chemical, hydrazine (4-12 mM), on methionine synthase (EC 2.1.1.13) activity and levels of the sulphur amino acids homocysteine, cysteine, and taurine as well as GSH were investigated in vitro in isolated rat hepatocyte suspensions and monolayers in order to explain some of the adverse in vivo effects of hydrazine. None of the concentrations of hydrazine were overtly cytotoxic in hepatocyte suspensions (measured as lactate dehydrogenase [LDH] leakage) after 3 hr. However, after 24 hr in culture cells treated with 12 mM, hydrazine showed a significant increase in LDH leakage. Methionine synthase activity was reduced by hydrazine (8 and 12 mM) in suspensions (by 45 and 55%, after 3 hr) and monolayers (12 mM; 65-80% after 24 hr). This was not due to nitric oxide production and the inhibitor of nitric oxide synthase, Nomega-nitro-L-arginine, failed to protect against the hydrazine-induced loss of ATP and GSH and the reduction in urea synthesis at 24 hr. Homocysteine export was increased by 6 mM hydrazine, and total taurine content of treated cells was increased by 12 mM hydrazine. Thus, hydrazine was found to have several important and possibly deleterious effects on some parts of the sulphur amino acid pathway.
Authors:
S H Kenyon; C J Waterfield; D S Asker; M Kudo; D W Moss; T E Bates; A Nicolaou; W A Gibbons; J A Timbrell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biochemical pharmacology     Volume:  57     ISSN:  0006-2952     ISO Abbreviation:  Biochem. Pharmacol.     Publication Date:  1999 Jun 
Date Detail:
Created Date:  1999-06-01     Completed Date:  1999-06-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0101032     Medline TA:  Biochem Pharmacol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1311-9     Citation Subset:  IM    
Affiliation:
Department of Pharmaceutical and Biological Chemistry, School of Pharmacy, University of London, UK.
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MeSH Terms
Descriptor/Qualifier:
5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase / metabolism*
Amino Acids, Sulfur / metabolism*
Animals
Carcinogens / pharmacology
Cell Survival / drug effects
Culture Media / metabolism
Cysteine / metabolism
Cytosol / metabolism
Enzyme Inhibitors / pharmacology
Homocysteine / metabolism
Hydrazines / pharmacology*
Liver
Male
Nitroarginine / pharmacology
Rats
Rats, Wistar
Taurine / metabolism
Vitamin B 12 / metabolism*
Chemical
Reg. No./Substance:
0/Amino Acids, Sulfur; 0/Carcinogens; 0/Culture Media; 0/Enzyme Inhibitors; 0/Hydrazines; 107-35-7/Taurine; 2149-70-4/Nitroarginine; 302-01-2/hydrazine; 454-28-4/Homocysteine; 52-90-4/Cysteine; 68-19-9/Vitamin B 12; EC 2.1.1.13/5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase

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


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