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Putrescine catabolism in mammalian brain.

In contrast with putrescine (1,4-diaminobutane), which is a substrate of diamine oxidase, monoacetylputrescine is oxidatively deaminated both in vitro and in vivo by monoamine oxidase. The product of this reaction is N-acetyl-gamma-aminobutyrate. The existence of a degradative pathway in mammalian brain for putrescine is shown, which comprises acetylation of putrescine, oxidative deamination of monoacetylputrescine to N-acetyl-gamma-aminobutyrate, transformation of N-acetyl-gamma-aminobutyrate to gamma-aminobutyrate and degradation of gamma-aminobutyrate to CO(2) via the tricarboxylic acid cycle.