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. 1972 Jul;128(4):869–877. doi: 10.1042/bj1280869

The control of nucleic acid and nicotinamide nucleotide synthesis in regenerating rat liver

G M Ferris 1, J B Clark 1
PMCID: PMC1173907  PMID: 4404767

Abstract

1. The effect of injecting nicotinamide on the incorporation of [14C]orotate into the hepatic nucleic acids of rats after partial hepatectomy was investigated. 2. At 3h after partial hepatectomy the rapid incorporation of [14C]orotate into RNA, and at 20h after partial hepatectomy the incorporation of [14C]orotate into both RNA and DNA, were inhibited in a dose-dependent fashion by the previous injection of nicotinamide. 3. The injection of nicotinamide at various times before the injection of [14C]orotate at 20h after partial hepatectomy revealed an inhibition of the incorporation of orotate into RNA and DNA which was non-linear with respect to the duration of nicotinamide pretreatment. 4. The induction of a hepatic ATP depletion by ethionine demonstrated that the synthesis of hepatic NAD and NADP in partially hepatectomized rats was more susceptible to an ATP deficiency than in control rats. 5. The total hepatic activity of ribose phosphate pyrophosphokinase (EC 2.7.6.1) was assayed at various times after partial hepatectomy and found to be only marginally greater than the maximum rate of hepatic NAD synthesis induced in vivo by nicotinamide injection between 12 and 24h after partial hepatectomy. 6. It is suggested that a competition exists between NAD synthesis and purine and pyrimidine nucleotide synthesis for available ATP and particularly 5-phosphoribosyl 1-pyrophosphate. In regenerating liver the competition is normally in favour of the synthesis of nucleic acid precursors, at the expense of NAD synthesis. This situation may be reversed by the injection of nicotinamide with a subsequent inhibition of nucleic acid synthesis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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