Monoamine oxidase B (MAOB)-containing structures in MAOA-deficient transgenic mice

Monoamine oxidase (MAO)-containing structures were studied for the first time in type A MAO (MAOA)-deficient transgenic mice (Tg8) derived from C3H strain, using MAO enzyme histochemistry. In this mutant line, MAOA activity was not detected in neurons of the locus coeruleus. In contrast, in their do...

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Published in:Brain research 1997-10, Vol.771 (1), p.121-132
Main Authors: Ikemoto, Keiko, Kitahama, Kunio, Seif, Isabelle, Maeda, Toshihiro, De Maeyer, Edward, Valatx, Jean-Louis
Format: Article
Language:English
Subjects:
Aggressive behavior
Animals
Brain - enzymology
Catecholamine
Cats
Cerebral Cortex - enzymology
Clorgyline - pharmacology
Female
Histochemistry
Isoenzymes - deficiency
Isoenzymes - genetics
Isoenzymes - metabolism
Locus Coeruleus - enzymology
Male
Mice
Mice, Inbred C3H
Mice, Transgenic
Monoamine oxidase
Monoamine Oxidase - deficiency
Monoamine Oxidase - genetics
Monoamine Oxidase - metabolism
Mouse
Nerve Fibers - enzymology
Neurons - enzymology
Organ Specificity
Primates
Raphe Nuclei - enzymology
Rats
Serotonin
Species difference
Tegmentum Mesencephali - enzymology
Transgenic animal
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Summary:Monoamine oxidase (MAO)-containing structures were studied for the first time in type A MAO (MAOA)-deficient transgenic mice (Tg8) derived from C3H strain, using MAO enzyme histochemistry. In this mutant line, MAOA activity was not detected in neurons of the locus coeruleus. In contrast, in their dorsal raphe neurons, we noted an intense activity of type B MAO (MAOB). Based on pharmacological MAOA suppression experiments employing a specific inhibitor (clorgyline), we confirmed that the localization of MAOB-positive structures are not different between Tg8 mutant and normal C3H line. Many of MAOB-positive structures which have not been described previously in the rat, cat and primates were described in this study. In the forebrain, MAOB-containing neurons were discriminated in the striatum, septal nuclei, major island of Calleja, diagonal band, medial forebrain bundle, ventral pallidum and amygdaloid nucleus. Stained neurons in the thalamus and hypothalamus were much more extensively distributed in the mouse than the rat. Pontine laterodorsal tegmental neurons showed MAOB activity. The present data suggest that serotonin, a preferential substrate for MAOA, can be oxidized by MAOB in MAOA-deficient Tg8 mice.
ISSN:0006-8993
1872-6240
DOI:10.1016/S0006-8993(97)00832-9