Summary
Dopamine behaves mainly as a MAO-A substrate in rodent brain, but selective inhibition of MAO-B results in an increased turning activity following L-DOPA administration in hemi-Parkinsonian rodents. Unilateral substantia nigra dopaminergic denervation results in serotonergic hyper-innervation which may increase the contribution of MAO-A in the denervated striatum. Possibly as a result of this, there was no change in striatal MAO-A activity when 95% of dopaminergic innervation was reduced by 6-hydroxydopamine, as assessed by apomorphine-induced turning activity. MAO-B as well as MAO-A may contribute to deamination of dopamine produced from L-DOPA.
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Abbreviations
- AAADC:
-
aromatic amino-acid decarboxylase
- COMT:
-
catechol-O-methyltransferase
- DA:
-
dopamine
- 5,7-DHT:
-
5,7-dihydroxytryptamine
- 5-HT:
-
5-hydroxytryptamine
- L-DOPA:
-
L-3,4-dihydroxyphenylalanine
- LID:
-
L-DOPA-induced dyskinesias
- MAO:
-
monoamine oxidase
- 6-OHDA:
-
6-hydroxydopamine
- PD:
-
Parkinson’s disease
- 2-PEA:
-
2-phenylethylamine
- snpc:
-
substantia nigra pars compacta
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Finberg, J., Sader-Mazbar, O. Modification of L-DOPA pharmacological activity by MAO inhibitors. J Neural Transm 114, 801–805 (2007). https://doi.org/10.1007/s00702-007-0691-y
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DOI: https://doi.org/10.1007/s00702-007-0691-y