Inhibition of the formation of the neurotoxin 5-S-cysteinyl-dopamine by polyphenols.

Vauzour, D, Vafeiadou, K and Spencer, JPE (2007) Inhibition of the formation of the neurotoxin 5-S-cysteinyl-dopamine by polyphenols. Biochemical and Biophysical Research Communications, 362 (2). pp. 340-6. ISSN 0006-291X

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Abstract

The death of nigral neurons in Parkinson's disease is thought to involve the formation of the endogenous neurotoxin, 5-S-cysteinyl-dopamine. In the present study, we show that the polyphenols, (+)-catechin and caffeic acid, which contain a catechol moiety, inhibit tyrosinase-induced formation of 5-S-cysteinyl-dopamine via their capacity to undergo tyrosinase-induced oxidation to yield cysteinyl-polyphenol adducts. In contrast, the inhibition afforded by the flavanone, hesperetin, was not accompanied by the formation of cysteinyl-hesperetin adducts, indicating that it may inhibit via direct interaction with tyrosinase. Whilst the stilbene resveratrol also inhibited 5-S-cysteinyl-dopamine formation, this was accompanied by the formation of dihydrobenzothiazine, a strong neurotoxin. Our data indicate that the inhibitory effects of polyphenols against 5-S-cysteinyl-dopamine formation are structure-dependent and shed further light on the mechanisms by which polyphenols exert protection against neuronal injury relevant to neurodegenerative diseases.

Item Type: Article
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
Depositing User: David Vauzour
Date Deposited: 14 Apr 2012 21:28
Last Modified: 17 Oct 2018 15:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/34828
DOI:

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