Evaluation of Levodopa and Carbidopa Antioxidant Activity in Normal Human Lymphocytes In Vitro: Implication for Oxidative Stress in Parkinson's Disease

Antonia Carla Testa, Luca Padua, Massimo Santoro, Monica Colamartino, Guglielmo Duranti, Stefania Sabatini, Roberta Ceci, Antonella Testa, Renata Cozzi

Risultato della ricerca: Contributo in rivistaArticolo in rivista

16 Citazioni (Scopus)

Abstract

The main pathochemical hallmark of Parkinson's disease (PD) is the loss of dopamine in the striatum of the brain, and the oral administration of levodopa (L-dopa) is a treatment that partially restores the dopaminergic transmission. In vitro assays have demonstrated both toxic and protective effects of L-dopa on dopaminergic cells, while in vivo studies have not provided any convincing data. The peripheral metabolic pathways significantly decrease the amount of L-dopa reaching the brain; therefore, all of the current commercial formulations require an association with an inhibitor of dopa-decarboxylase, such as carbidopa. However, the dosage and the actual effectiveness of carbidopa have not yet been well defined. PD patients exhibit a reduced efficiency of the endogenous antioxidant system, and peripheral blood lymphocytes (PBLs) represent a dopaminergic system for use as a cellular model to study the pharmacological treatments of neurodegenerative disorders in addition to analysing the systemic oxidative stress. According to our previous studies demonstrating a protective effect of both L-dopa and carbidopa on neuroblastoma cells in vitro, we used the PBLs of healthy donors to evaluate the modulation of DNA damage by different concentrations of L-dopa and carbidopa in the presence of oxidative stress that was exogenously induced by H2O2. We utilised a TAS assay to evaluate the in vitro direct scavenging activity of L-dopa and carbidopa and analysed the expression of genes that were involved in cellular oxidative metabolism. Our data demonstrate the antioxidant capacity of L-dopa and carbidopa and their ability to protect DNA against oxidative-induced damage that derives from different mechanisms of action.
Lingua originaleEnglish
pagine (da-a)106-117
Numero di pagine12
RivistaNeurotoxicity Research
DOI
Stato di pubblicazionePubblicato - 2014

Keywords

  • Parkinson
  • carbidopa antioxidant activity
  • levodopa

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