Cited by 264Parkinson's Disease Mechanisms and TreatmentsNuclear Receptors and SignalingNeurological disorders and treatments

Tyrosine Hydroxylase and Parkinson’s Disease

Haavik, Jan, Toska, Karen·1998·Molecular Neurobiology

Abstract

A consistent neurochemical abnormality in Parkinson's disease (PD) is degeneration of dopaminergic neurons in substantia nigra, leading to a reduction of striatal dopamine (DA) levels. As tyrosine hydroxylase (TH) catalyses the formation of L-DOPA, the rate-limiting step in the biosynthesis of DA, the disease can be considered as a TH-deficiency syndrome of the striatum. Similarly, some patients with hereditary L-DOPA-responsive dystonia, a neurological disorder with clinical similarities to PD, have mutations in the TH gene and decreased TH activity and/or stability. Thus, a logical and efficient treatment strategy for PD is based on correcting or bypassing the enzyme deficiency by treatment with L-DOPA, DA agonists, inhibitors of DA metabolism, or brain grafts with cells expressing TH. A direct pathogenetic role of TH has also been suggested, as the enzyme is a source of reactive oxygen species (ROS) in vitro and a target for radical-mediated oxidative injury. Recently, it has been demonstrated that L-DOPA is effectively oxidized by mammalian TH in vitro, possibly contributing to the cytotoxic effects of DOPA. This enzyme may therefore be involved in the pathogenesis of PD at several different levels, in addition to being a promising candidate for developing new treatments of this disease.

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Crossref · 10.1007/bf02741387

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Authors
Haavik, J., & Toska, K.
Affiliations
University of Bergen (NO)
Venue
Molecular Neurobiology
Published
1998-06
Volume
16
Issue
3
Pages
285-309
ISSN
  • 0893-7648 (ISSN-L)
  • 1559-1182
OpenAlex
W2000631088
Cited by
263
References
190
Citations by year
2026: 11 · 2025: 9 · 2024: 20 · 2023: 17 · 2022: 17 · 2021: 14 · 2020: 15 · 2019: 16 · 2018: 13 · 2017: 10 · 2016: 12 · 2015: 10 · 2014: 22 · 2013: 13 · 2012: 14
FWCI
0.55
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Neurobiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Norges Forskningsråd
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nuclear Receptors and Signaling
  • Health Sciences › Medicine › Neurology › Neurological disorders and treatments
Keywords
tyrosine hydroxylase, Parkinson's disease, dopaminergic neuron loss, substantia nigra, striatal dopamine, L-DOPA, dopamine synthesis, L-DOPA oxidation, reactive oxygen species, oxidative damage, dopamine agonists, enzyme deficiency
MeSH terms
Animals, Antiparkinson Agents, Brain, Dystonia, Humans, Monoamine Oxidase, Mutation, Parkinson Disease, Tyrosine 3-Monooxygenase, Alternative Splicing

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