Developmental Changes in the Activity and Substrate Specificities of Mouse Brain Monoamine Oxidase

Overview

Journal Neurochem Res

Specialties Chemistry
Neurology

Date 1984 May 1

PMID 6472564

Citations 3

Authors

Y Koide

K Kobayashi

Affiliations

Soon will be listed here.

Abstract

Developmental changes in monoamine oxidase (MAO) activity in the mouse brain were investigated with the substrates beta-phenylethylamine (PEA), tryptamine, and 5-hydroxytryptamine (5-HT). In the newborn brain, MAO activity towards PEA was found to be much lower than the adult and to be inhibited by clorgyline in a double-sigmoidal fashion. The inhibition curve shifted to a single-sigmoidal pattern with age. MAO activity towards 5-HT as substrate was inhibited by 90% and in a single-sigmoidal manner by clorgyline throughout the postnatal life. Lineweaver-Burk plots with PEA as substrate presented two linear lines (apparent Km: 28.6 and 4.1 microM) for the newborn and one line (apparent Km: 11.4 microM) for the adult, respectively. The plot with high Km value for the newborn brain disappeared in a clorgyline-treated preparation. These findings suggest that age-dependent alterations in the ratio of MAO-A/MAO-B activity affect the substrate specificity of the enzyme.

Citing Articles

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