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Dopamine in Parkinson's disease.

Saad Latif1, Muhammad Jahangeer1, Dure Maknoon Razia1

  • 1Department of Biochemistry, Government College University Faisalabad, Faisalabad 38000, Pakistan.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|August 14, 2021
PubMed
Summary

This review details dopamine's role in Parkinson's disease, focusing on its synthesis, receptors, and the neurotoxic effects of its oxidation products like aminochrome in neuronal death.

Keywords:
5,6-indolequinoneAminochromeDopamineDopamine o-quinoneDopamine receptors (D1-like and D2-like family)Dopaminergic pathwaysNeurodegenerationParkinson’s disease

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • Parkinson's disease is a neurodegenerative disorder characterized by the loss of dopamine-producing neurons.
  • Dopamine, a critical neurotransmitter, plays a vital role in motor control and other functions.
  • Understanding dopamine's pathways and receptor interactions is key to addressing neurodegenerative diseases.

Purpose of the Study:

  • To review the dopamine synthetic pathway and its receptor binding.
  • To elucidate the role of dopamine oxidation products in Parkinson's disease pathogenesis.
  • To explore potential inhibitory mechanisms against dopamine-induced neurotoxicity.

Main Methods:

  • Review of existing literature on dopamine synthesis, receptors, and metabolism.
  • Analysis of the biochemical pathways involved in dopamine oxidation.
  • Examination of the formation and effects of aminochrome and related compounds.

Main Results:

  • Dopamine is synthesized in specific brain regions and acts via five receptor subtypes (D1-D5).
  • Oxidation of dopamine yields reactive intermediates like aminochrome, which promotes alpha-synuclein aggregation and oxidative stress.
  • Aminochrome's neurotoxic effects can be mitigated by inhibiting its polymerization and oxidative deamination.

Conclusions:

  • Dopamine's intricate physiology is central to Parkinson's disease.
  • The neurotoxic potential of dopamine oxidation products, particularly aminochrome, is a significant factor in neuronal degeneration.
  • Targeting dopamine metabolism and its toxic byproducts offers therapeutic avenues for Parkinson's disease.