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- W1506449286 abstract "The effects of inhibitors of polyamine synthesis on DNA synthesis in rat liver regenerating after partial hepatectomy were studied. Neither 1,1′-[(methylethanediylidene)-dinitrilo]-bis-(3-aminoguanidine), a potent irreversible inhibitor of S-adenosylmethionine decarboxylase, nor 1,3-diaminopropane, an indirect inhibitor of ornithine decarboxylase, strongly inhibited [3H]thymidine incorporation into DNA when given as a single injection 1 h after operation and 23 h before DNA synthesis was measured. However, when the two inhibitors were given together, DNA synthesis was completely prevented. The incorporation of [14C]leucine into protein was not affected by this treatment. Combined administration of the inhibitors partially prevented the rise in hepatic spermidine levels normally seen during liver regeneration, but neither drug was effective alone. Hepatic putrescine content measured 12 h after treatment was increased by the combined inhibitors whereas, spermine levels were not significantly changed. By 24 h after operation the effects of the combined inhibitors on spermidine levels had almost worn off but DNA synthesis was greatly inhibited. However, by 40 h after operation the inhibitor treatment had no effect on [3H]thymidine incorporation into DNA. Also treatment with the combined inhibitors abolished DNA synthesis at 24 h after partial hepatectomy only when given more than 6 h before measurement suggesting that the effect was indirect and required time to become apparent. These results are consistent with other recent studies in which prior accumulation of spermidine appeared to be required for normal DNA replication and cell division." @default.
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- W1506449286 date "1978-01-01" @default.
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- W1506449286 title "Effects of inhibitors of decarboxylase and ornithine decarboxylase on DNA synthesis in rat liver after partial hepatectomy" @default.
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- W1506449286 doi "https://doi.org/10.1016/0005-2787(78)90044-8" @default.
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