Abstract
Levels of dopamine, noradrenaline and serotonin and their metabolites and the activities of monoamine oxidase A and B, have been determined in the prefrontal cortex of the rat during ageing. Serotonin turnover rate has been measured as 5-hydroxytryptophan accumulation rate after central decarboxylase inhibition. The major changes were an increase of dopamine and noradrenaline levels and a decrease of serotonin in aged animals compared with control animals. A decrease of the MAO-A to MAO-B ratio was found in aged rats.
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