Abstract
Brain aminopeptidase activity has been suggested as a candidate for the regulation and biotransformation of several neuropeptides. In this paper, changes in Lys- and Leu-aminopeptidase activities in rat brain hemispheres, cerebellum and medulla were examined in 1-, 3-, 5- and 7-days postnatal subjects. Aminopeptidase activities were studied by measuring the rate of hydrolysis of the artificial chromogenic substrates Lys- and Leu-2-naphthylamides (fluorimetrically detected in triplicate). Both enzyme activities show a decrease on the 3rd day of life followed by increases on the 5th and 7th day postbirth. It is suggested that these activities could play a part in the neurochemical changes that take place during axonal and dendritic growth in the rat brain.
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