Mucosal mono- and polyamine oxidase activities in digestive tract are distributed complementary to diamine oxidase

The distribution of mucosal monoamine and polyamine oxidases along rat gastrointestinal tract presents a complementary pattern to that of diamine oxidase. The maximal diamine oxidase values are found in the last two thirds of small intestine, whereas the highest activities of monoamine and polyamine oxidase occur in the proximal duodenum and in the large intestine.