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- W2108671197 abstract "Perturbations in DNA and/or membranes are considered to be important for the carcinogenic process. A search for nutritional and metabolic means of disturbing the homeostasis of DNA and membranes revealed that nucleotide pools offer an exciting possibility. An imbalance in nucleotide pools can exert a two-pronged attack on both DNA and membranes. When given to rats, orotic acid, a precursor of pyrimidine nucleotides, results in an imbalance in nucleotide pools (an increase in uridine nucleotides and a decrease in inosine/adenine nucleotides), alterations in both DNA and membranes, and promotion of carcinogenesis in the liver initiated by chemical carcinogens. Agents such as adenine and allopurinol, which inhibit the metabolism of orotic acid and thereby decrease the formation of uridine nucleotides, and galactosamine, which traps uridine nucleotides, inhibited the promotional effects of orotic acid in the liver. These results suggested that orotic acid needs to be metabolized to uridine nucleotides and the creation of a subsequent imbalance in nucleotide pools is important for the promotional effects of orotic acid. To determine whether the creation of a nucleotide pool imbalance is a more general mechanism of tumor promotion, two lines of approach were investigated. One was to determine the effect of orotic acid on promotion of carcinogenesis in other organs, and the second approach was to determine how to induce nucleotide pool imbalances by means other than orotic acid administration. It is interesting to note that orotic acid promotes carcinogenesis in duodenum initiated by azoxymethane. Regarding the second approach, it became apparent that several metabolic disturbances result in increased orotic acid synthesis and alterations in nucleotide pools.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2108671197 date "1987-02-01" @default.
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- W2108671197 title "Dietary and Metabolic Manipulations of the Carcinogenic Process: Role of Nucleotide Pool Imbalances in Carcinogenesis" @default.
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- W2108671197 doi "https://doi.org/10.1177/019262338701500210" @default.
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