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. 1976 Jul;58(1):137–141. doi: 10.1172/JCI108442

Effect of salicylates on histamine and L-histidine metabolism. Inhibition of imidazoleacetate phosphoribosyl transferase.

J Moss, M C De Mello, M Vaughan, M A Beaven
PMCID: PMC333164  PMID: 180057

Abstract

In man and other animals, urinary excretion of the histidine and histamine metabolite, imidazoleacetate, is increased and that of its conjugated metabolite, ribosylimidazoleacetate, decreased by salicylates. Imidazoleacetate has been reported to produce analgesia and narcosis. Its accumulation as a result of transferase inhibition could play a part in the therapeutic effects of salicylates. To determine the locus of salicylate action, we have investigated the effect of anti-inflammatory drugs on imidazoleacetate phosphoribosyl transferase, the enzyme that catalyzes the ATP-dependent conjugation of imidazoleacetate with phosphoribosylpyrophosphate. As little as 0.2 mM aspirin produced 50% inhibition of the rat liver transferase. In vivo, a 30% decrease in the urinary excretion of ribosylimidazoleacetate has been observed with plasma salicylate concentrations of 0.4 mM. The enzyme was also inhibited by sodium salicylate but not by salicylamide, sodium gentisate, aminopyrine, phenacetin, phenylbutazone, or indomethacin. The last four drugs have been shown previously not to alter the excretion of ribosylimidazoleacetate when administered in vivo. Since both the drug specificity and inhibitory concentrations are similar in vivo and in vitro, it seems probable that the effect of salicylates on imidazoleacetate conjugation results from inhibition of imidazoleacetate phosphoribosyl transferase.

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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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