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Heparin-induced increase of diamine oxidase in lymph and blood plasma of rat, guinea-pig and rabbit.

After i.v. injection of heparin (1.6 IU/g b.w.) there was a significant increase of the diamine oxidase (DAO) activity in lymph and blood plasma in rat, guinea-pig and rabbit. The ratio between lymph and plasma DAO activity was higher in rat and rabbit than in guinea-pig under basal conditions. This difference was even more pronounced after heparin injection. Withdrawal of mesenteric or thoracic duct lymph from the circulation of the animals was accompanied by a poor response to heparin of the plasma DAO activity in rat and rabbit, whereas the response in the guinea-pig seemed to be uninfluenced. These results suggest that, in analogy with earlier findings in man, the contribution from lymph to the heparin-induced DAO response in blood plasma may be significant in the rat and rabbit, but not in the guinea-pig.