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. 1973 Nov;136(3):669–676. doi: 10.1042/bj1360669

Effect of methylglyoxal bis(guanylhydrazone) on polyamine metabolism in normal and regenerating rat liver and rat thymus

E Hölttä 1, P Hannonen 1, J Pispa 1, J Jänne 1
PMCID: PMC1166002  PMID: 4205354

Abstract

1. Injections of sublethal doses of methylglyoxal bis(guanylhydrazone), a potent inhibitor of putrescine-activated S-adenosylmethionine decarboxylase in vitro, resulted after a few days in an immense increase in the activity of S-adenosylmethionine decarboxylase in normal and regenerating rat liver and in rat thymus. The increase in the activity of S-adenosylmethionine decarboxylase was at least partly due to a marked lengthening of the half-life of the enzyme. 2. In regenerating liver and thymus there was also a moderate stimulation of the activity of ornithine decarboxylase (EC 4.1.1.17) and a marked accumulation of tissue putrescine. 3. Injection of methylglyoxal bis(guanylhydrazone) into the rat also markedly decreased the activity of diamine oxidase (EC 1.4.3.6) in thymus. 4. In no cases where doses of methylglyoxal bis(guanylhydrazone) close to the LD50 dose for the rat were used was it possible to lower tissue spermidine content to any significant extent. 5. Methylglyoxal bis(guanylhydrazone) seemed to act as a competitive inhibitor for the substrate S-adenosylmethionine and as an uncompetitive inhibitor for the activator putrescine in the decarboxylation of S-adenosylmethionine in vitro. 6. In the diamine oxidase reaction, with putrescine as the substrate, methylglyoxal bis(guanylhydrazone) was a non-competitive inhibitor for putrescine.

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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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