Inhibition of histamine-N-methyltransferase (HNMT) by fragments of 9-amino-1,2,3,4-tetrahydroacridine (tacrine) and by beta-carbolines.

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Cumming P, Vincent SR

Inhibition of histamine-N-methyltransferase (HNMT) by fragments of 9-amino-1,2,3,4-tetrahydroacridine (tacrine) and by beta-carbolines.

Biochem Pharmacol. 1992 Sep 1;44(5):989-92.

PubMed ID

1530666 [ View in PubMed

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Abstract

Histamine-N-methyltransferase (HNMT), the major enzyme for the metabolism of histamine in rat brain, is potently inhibited by 9-amino-1,2,3,4-tetrahydroacridine (tacrine). Structural fragments of tacrine were less potent inhibitors of rat brain HNMT than was tacrine itself. Harmaline and a number of other beta-carbolines inhibited HNMT with IC50 values in the range of 1-10 microM. HNMT inhibition by harmaline was competitive with respect to both substrates, S-adenosylmethionine and histamine (Ki = 1.4 microM). These findings are discussed in the context of mechanisms for HNMT inhibition.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Harmaline	Histamine N-methyltransferase	Protein	Humans	Unknown	Inhibitor	Details