Dataset Information

Pharmacological Modulation of Behaviour, Serotonin and Dopamine Levels in Daphnia magna Exposed to the Monoamine Oxidase Inhibitor Deprenyl.

ABSTRACT: This study assessed the effects of the monoamine oxidase (MAO) inhibitor deprenyl in Daphnia magna locomotor activity. The mechanisms of action of deprenyl were also determined by studying the relationship between behaviour, MAO activity and neurotransmitter levels. Modulation of the D. magna monoamine system was accomplished by 24 h exposure to two model psychotropic pharmaceuticals with antagonistic and agonistic serotonin signalling properties: 10 mg/L of 4-chloro-DL-phenylalanine (PCPA) and 1 mg/L of deprenyl, respectively. Contrasting behavioural outcomes were observed for deprenyl and PCPA reflected in decreased basal locomotor activity and enhanced habituation for the former compound and delayed habituation for the latter one. Deprenyl exposure inhibited monoamine oxidase (MAO) activity and increased the concentrations of serotonin, dopamine and the dopamine metabolite 3-methoxytyramine in whole D. magna extracts. Our findings indicate that D. magna is a sensitive and useful nonvertebrate model for assessing the effects of short-term exposure to chemicals that alter monoamine signalling changes.

SUBMITTER: Bellot M

PROVIDER: S-EPMC8402476 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature

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Pharmacological Modulation of Behaviour, Serotonin and Dopamine Levels in Daphnia magna Exposed to the Monoamine Oxidase Inhibitor Deprenyl.

Bellot Marina M Faria Melissa M Gómez-Canela Cristian C Raldúa Demetrio D Barata Carlos C

Toxics 20210809 8

This study assessed the effects of the monoamine oxidase (MAO) inhibitor deprenyl in Daphnia magna locomotor activity. The mechanisms of action of deprenyl were also determined by studying the relationship between behaviour, MAO activity and neurotransmitter levels. Modulation of the D. magna monoamine system was accomplished by 24 h exposure to two model psychotropic pharmaceuticals with antagonistic and agonistic serotonin signalling properties: 10 mg/L of 4-chloro-DL-phenylalani ...[more]

PMID: 34437505

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Project description:Genetic loss or pharmacological inhibition of monoamine oxidase A (MAOA) in mice leads to a large increase in whole-brain levels of serotonin (5-HT). Excess 5-HT in mouse neonates prevents the normal barrel-like clustering of thalamic axons in the somatosensory cortex. Projection fields of other neuron populations may develop abnormally. In the present study, we have analyzed the localization of 5-HT immunolabeling in the developing brain of MAOA knock-out mice. We show numerous atypical locations of 5-HT during embryonic and postnatal development. Catecholaminergic cells of the substantia nigra, ventral tegmental area, hypothalamus, and locus ceruleus display transient 5-HT immunoreactivity. Pharmacological treatments inhibiting specific monoamine plasma membrane transporters and genetic crosses with mice lacking the dopamine plasma membrane transporter show that the accumulation of 5-HT in these catecholaminergic cells is attributable to 5-HT uptake via the dopamine or the norepinephrine plasma membrane transporter. In the telencephalon, transient 5-HT immunolabeling is observed in neurons in the CA1 and CA3 fields of the hippocampus, the central amygdala, the indusium griseum, and the deep layers of the anterior cingulate and retrosplenial cortices. In the diencephalon, primary sensory nuclei, as well as the mediodorsal, centrolateral, oval paracentral, submedial, posterior, and lateral posterior thalamic nuclei, are transiently 5-HT immunolabeled. The cortical projections of these thalamic nuclei are also labeled. In the brainstem, neurons in the lateral superior olivary nucleus and the anteroventral cochlear nucleus are transiently 5-HT immunolabeled. None of these structures appear to express the monoamine biosynthetic enzyme L-aromatic amino acid decarboxylase. The administration of monoamine plasma membrane transporter inhibitors indicates that the 5-HT immunolabeling in these structures is attributable to an uptake of 5-HT by the 5-HT plasma membrane transporter. This points to neuron populations that form highly precise projection maps that could be affected by 5-HT during specific developmental stages.

Dataset Information

Pharmacological Modulation of Behaviour, Serotonin and Dopamine Levels in Daphnia magna Exposed to the Monoamine Oxidase Inhibitor Deprenyl.

Publications

Pharmacological Modulation of Behaviour, Serotonin and Dopamine Levels in <i>Daphnia magna</i> Exposed to the Monoamine Oxidase Inhibitor Deprenyl.

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