The distribution of noradrenaline, serotonin, and gamma-aminobutyric acid in the monkey nucleus accumbens

Author(s): Ikemoto K, Kitahama K, Maeda T, Satoh K

Abstract

MAOB-containing structures in the nucleus accumbens were ultrastructurally studied for the first time, using MAOA-deficient transgenic mice and MAO enzyme histochemistry. Among the striatal structures, the nucleus accumbens, and in particular its dorsal shell, showed the strongest MAOB activity. MAOB-active cell bodies were embedded in a dense MAOB-active fiber plexus. MAOB-positive terminals formed axo-dendritic synapses which were exclusively of the asymmetric type. It is suggested that dopamine in the nucleus accumbens shell is transported into MAOB-positive fibers where it is degraded by MAOB.

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