Document Detail

Comparison of the biological effects of four irreversible inhibitors of ornithine decarboxylase in two murine lymphocytic leukemia cell lines.
MedLine Citation:
PMID:  3080234     Owner:  NLM     Status:  MEDLINE    
The effects of the enzyme-activated irreversible inhibitors of ornithine decarboxylase, alpha-difluoromethylornithine, alpha-(fluoromethyl)dehydroornithine, alpha-(fluoromethyl)dehydroornithine methyl ester, and (2R,5R)-6-heptyne-2,5-diamine (RR-MAP), on cell growth and parameters related to polyamine biosynthesis were compared in L5178Y and L1210 cells under identical culture conditions. The two lines are murine lymphocytic leukemia cells which differ in their ability to metabolize 5'-methylthioadenosine, the by-product of polyamine biosynthesis: L5178Y cells contain a specific 5'-methylthioadenosine phosphorylase; L1210 cells do not. In L1210 cells, the 50% inhibitory concentrations (lC50S) of the various analogues were 3.0 mM for alpha-difluoromethylornithine, 0.2 mM for alpha-(fluoromethyl)dehydroornithine, 0.1 mM for alpha-(fluoromethyl)dehydroornithine methyl ester, and 0.01 mM for RR-MAP. L5178Y cells were somewhat more sensitive to the inhibitors with lC50 values of 0.5 mM for alpha-difluoromethylornithine, 0.06 mM for alpha-(fluoromethyl)dehydroornithine, 0.03 mM for alpha-(fluoromethyl)dehydroornithine methyl ester, and 0.002 mM for RR-MAP. In all cases, growth inhibition was fully prevented by exogenous putrescine. The effects of the inhibitors on parameters related to polyamine metabolism were compared at drug concentrations approximating the average of lC50 values for the two cell lines. Under these treatment conditions, polyamine pools were similarly affected by the various inhibitors. Typically, putrescine and spermidine were depleted, but effects on spermine pools differed according to the cell line, increasing slightly in L1210 cells and decreasing by about 50% in L5178Y cells. Spermine pools in L1210 cells could be reduced by RR-MAP at concentrations higher than the lC50 (i.e., 0.1 mM). Clonogenicity in soft agar was decreased about 50% by putrescine and spermidine depletion and was not further affected by spermine depletion. The inhibitors elevated S-adenosylmethionine decarboxylase activity in both cell lines with a 2-fold greater increase in L5178Y cells than in L1210 cells. Finally, the inhibitors decreased S-adenosylmethionine pools in L1210 cells by about 50% but had little effect on these pools in L5178Y cells with the exception of RR-MAP, which decreased S-adenosylmethionine pools by about 40%. Whether the different polyamine responses of the two cell lines are related to their ability to metabolize 5'-methylthioadenosine is uncertain. It is apparent, however, that the presence or absence of methylthioadenosine phosphorylase does not substantially modulate the antiproliferative activity of ornithine decarboxylase inhibitors.(ABSTRACT TRUNCATED AT 400 WORDS)
P J Pera; D L Kramer; J R Sufrin; C W Porter
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Cancer research     Volume:  46     ISSN:  0008-5472     ISO Abbreviation:  Cancer Res.     Publication Date:  1986 Mar 
Date Detail:
Created Date:  1986-03-21     Completed Date:  1986-03-21     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  2984705R     Medline TA:  Cancer Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1148-54     Citation Subset:  IM    
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MeSH Terms
Biological Transport
Cell Cycle / drug effects
Cell Survival / drug effects
Diamines / pharmacology*
Leukemia L1210 / drug therapy,  enzymology
Leukemia L5178 / drug therapy,  enzymology
Leukemia, Lymphoid / drug therapy*,  enzymology
Ornithine / analogs & derivatives*,  pharmacology
Ornithine Decarboxylase / antagonists & inhibitors*
Polyamines / biosynthesis
Purine-Nucleoside Phosphorylase / metabolism
S-Adenosylmethionine / metabolism
Grant Support
Reg. No./Substance:
0/Alkynes; 0/Diamines; 0/Polyamines; 29908-03-0/S-Adenosylmethionine; 70052-12-9/Eflornithine; 7006-33-9/Ornithine; 81645-70-7/6-heptyne-2,5-diamine; 82006-84-6/alpha-(fluoromethyl)dehydroornithine; 96681-91-3/2-(fluoromethyl)dehydroornithine methyl ester; EC Phosphorylase; EC'-methylthioadenosine phosphorylase; EC Decarboxylase

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