Open AccessDNA Synthesis in HeLa Cells and Isolated Nuclei after Treatment with an Inhibitor of Spermidine Synthesis, Methyl Glyoxal Bis(guanylhydrazone)
Author(s) -
KROKAN Hans,
ERIKSEN Arne
Publication year - 1977
Publication title -
european journal of biochemistry
Language(s) - English
Resource type - Journals
eISSN - 1432-1033
pISSN - 0014-2956
DOI - 10.1111/j.1432-1033.1977.tb11273.x
Subject(s) - spermidine , spermine , putrescine , glyoxal , dna synthesis , thymidine , chemistry , cadaverine , dna , biochemistry , hela , microbiology and biotechnology , uridine , in vitro , biology , rna , enzyme , organic chemistry , gene
Addition of methyl glyoxal bis(guanylhydrazone) to HeLaS 3 suspension cultures resulted in increased putrescine levels and decreased spermidine and spermine levels preceding a drop in incorporation of [ 3 H]thymidine, [ 3 H]uridine and [ 14 C]leucine into macromolecules. When putrescine, spermidine, spermine or cadaverine was added simultaneously with methyl glyoxal bis(guanylhydrazone), the drug had no detectable effect on the synthesis of macromolecules. In nuclei isolated from cells treated with methyl glyoxal bis(guanylhydrazone) the reduction in the rate of DNA synthesis was equal to the reduction of [ 3 H]thymidine incorporation in the corresponding whole cells. The capability of the nuclei to synthesize DNA could not be restored by adding spermidine or spermine to the system in vitro . The rate of DNA chain elongation was only reduced slightly by methyl glyoxal bis(guanylhydrazone) indicating that decreased levels of spermidine and spermine lead to a decrease in the number of replication units active in DNA synthesis within each cell.