Document Detail

Cellular characterization of a new irreversible inhibitor of S-adenosylmethionine decarboxylase and its use in determining the relative abilities of individual polyamines to sustain growth and viability of L1210 cells.
MedLine Citation:
PMID:  2497733     Owner:  NLM     Status:  MEDLINE    
S-(5'-Deoxy-5'-adenosyl)methylthioethylhydroxylamine (AMA) is an irreversible inhibitor of S-adenosylmethionine (AdoMet) decarboxylase, which is designed to bind covalently the pyruvate residue at the enzyme active site. In the present study the cellular effects of AMA were characterized for the first time in cultured L1210 leukaemia cells. At the approximate IC50 (concn. giving 50% inhibition; 100 microM), AMA decreased spermidine and spermine by more than 80% at 48 h while increasing putrescine more than 10-fold. As an indication of enzyme specificity, growth inhibition was fully prevented with exogenous spermidine. When compared with the irreversible inhibitor of ornithine decarboxylase, alpha-difluoromethylornithine (DFMO), at similar growth-inhibitory concentrations, AMA was less cytotoxic, as determined by colony-formation efficiency. In combination with AMA, DFMO eliminated the rise in putrescine and decreased growth in an additive manner. The near-total depletion of intracellular polyamine pools achieved with the drug combination provided an opportunity to examine the relative abilities of individual polyamines to support growth and viability. Of the three exogenously supplied polyamines, only spermidine fully sustained cell growth and viability at control values during incubations totalling 120 h. By contrast, spermine supported growth at 23% of control and viability at 8%. Putrescine was similarly ineffective, supporting growth at 13% of control and viability at 7%. The data indicate that, in L1210 cells, spermidine is apparently the preferred polyamine in growth-related functions and is capable of fully supporting cell growth by itself. However, because spermine and putrescine can also support growth to some extent, maximum interference with growth and viability is best achieved by strategies which deplete all three polyamine pools.
D L Kramer; R M Khomutov; Y V Bukin; A R Khomutov; C W Porter
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Biochemical journal     Volume:  259     ISSN:  0264-6021     ISO Abbreviation:  Biochem. J.     Publication Date:  1989 Apr 
Date Detail:
Created Date:  1989-06-20     Completed Date:  1989-06-20     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  2984726R     Medline TA:  Biochem J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  325-31     Citation Subset:  IM    
Grace Cancer Drug Center, Roswell Park Memorial Institute, Buffalo, NY 14263.
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MeSH Terms
Adenosylmethionine Decarboxylase / antagonists & inhibitors*
Carboxy-Lyases / antagonists & inhibitors*
Cell Division / drug effects*
Cell Survival / drug effects
Deoxyadenosines / analogs & derivatives*,  pharmacology
Eflornithine / pharmacology
Leukemia L1210 / metabolism
Polyamines / metabolism*,  pharmacology
Putrescine / metabolism
Spermidine / metabolism
Spermine / metabolism
Tumor Cells, Cultured / drug effects,  metabolism,  pathology
Grant Support
Reg. No./Substance:
0/Deoxyadenosines; 0/Polyamines; 110-60-1/Putrescine; 124-20-9/Spermidine; 70052-12-9/Eflornithine; 71-44-3/Spermine; 84981-49-7/S-(5'-deoxyadenosyl-5')-S-methylthioethylhydroxylamine; EC 4.1.1.-/Carboxy-Lyases; EC Decarboxylase

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