Abstract
Derivatives from the isoquinoline group were found in many plants, food as well as in the mammalian brain. The interest with these substances appeared about 20 years back, after the exploration of their chemical structures similar to the well-known exogenous neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). Tetrahydroisoquinolines such as 1-benzyl-1,2,3,4-tetrahydroisoquinoline (1BnTIQ) and 1-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (salsolinol) show the neurotoxic activity to the dopamine neurons and this way it has been proposed as endogenous factors leading risks to Parkinson’s disease. In animals, research indicates that chronic administration of 1BnTIQ as well as salsolinol induced parkinsonian-like symptoms. Both compounds produce disturbances in the function of dopaminergic neurons, intensify oxidative stress, and inhibit mitochondrial complex I and/or II activity. In consequence, this mechanism of action leads to cell death via apoptosis. This review briefly describes the properties of 1BnTIQ and salsolinol in mammalian brain. This chapter presents the chemical structures of both compounds and possible pathways of their synthesis in the brain. A special focus was put on neurochemical effects of acute and chronic administration of 1BnTIQ and salsolinol on dopamine release as well as their metabolism in rat brain. Additionally, the effects of dopamine metabolism have been shown as a source of free radical generation in the brain.
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Abbreviations
- BBB:
-
Blood–brain barrier
- 1BnTIQ:
-
1-Benzyl-1,2,3,4-tetrahydroisoquinoline
- COMT:
-
Catechol-O-methyltransferase
- CSF:
-
Cerebrospinal fluid
- DA:
-
Dopamine
- DAT:
-
Dopamine transporter
- DOPAC:
-
3,4-Dihydroxyphenylacetic acid
- H2O2 :
-
Hydrogen peroxide
- HVA:
-
Homovanilic acid
- l-DOPA:
-
3,4-Dihydroxy-l-phenylalanine
- MPTP:
-
1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine
- MAO:
-
Enzyme monoamine oxidase
- PEA:
-
Phenylethylamine
- PD:
-
Parkinson’s disease
- ROS:
-
Reactive oxygen species
- TH:
-
Tyrosine hydroxylase
- TIQ:
-
1,2,3,4-Tetrahydroisoquinoline
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Acknowledgments
Thanks are due to Dr Jan Boksa (Department of Medicinal Chemistry, Institute of Pharmacology PAS, Krakow, Poland) for the synthesis of 1BnTIQ. The study was supported by the statutory funds of the Institute of Pharmacology, Polish Academy of Sciences, Krakow, Poland.
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Wąsik, A., Antkiewicz-Michaluk, L. (2012). Isoquinolines as Neurotoxins: Action and Molecular Mechanism. In: Antkiewicz-Michaluk, L., Rommelspacher, H. (eds) Isoquinolines And Beta-Carbolines As Neurotoxins And Neuroprotectants. Current Topics in Neurotoxicity, vol 1. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-1542-8_2
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