A critical analysis on the concentrations of phenolic compounds tested using in vitro and in vivo Parkinson's disease models

• Published in: Critical reviews in food science and nutrition Vol. 64; no. 19; pp. 6596 - 6615
• Main Authors: Perdigão, José Messias, Teixeira, Bruno José Brito, Carvalho-da-Silva, Vinicius, Prediger, Rui Daniel, Lima, Rafael Rodrigues, Rogez, Herve
• Format: Journal Article
• Language: English
• Published: United States Taylor & Francis 25.07.2024; Taylor & Francis Ltd
• Subjects: bioactive compounds; Bioavailability; Design of experiments; Experimental design; In vivo methods and tests; Movement disorders; natural antioxidants; Neurodegenerative diseases; Neuroprotection; Parkinson's disease; Phenolic compounds; Phenols; bioactive compounds; Parkinson’s disease; natural antioxidants
• ISSN: 1040-8398; 1549-7852; 1549-7852
• DOI: 10.1080/10408398.2023.2171960

Phenolic compounds (PCs) have neuroprotective effects with potential to prevent or slower the progression of Parkinson's disease (PD). However, whether the PCs neuroprotective effects can be observed under their dietary concentrations remains unclear. Therefore, we searched for the most cited articles in density on PCs and PD in the Web of Science Core Collection and All-Database (WoS-CC/AD) and selected the articles based on our eligibility criteria. From these 81 articles selected, we extracted information on experimental design, compounds tested, concentration and/or dose administered, route of administration, and main results obtained. We compared the concentrations of PCs evaluated in vitro with the concentrations bioavailable in the human bloodstream. Further, after extrapolation to humans, we compared the doses administered to animals in vivo with the daily consumed amounts of PCs. Concentrations evaluated in 21 in vitro laboratory studies were higher than those bioavailable in the bloodstream. In the case of in vivo laboratory studies, only one study administered doses of PCs in normal daily amount. The results of the comparisons demonstrate that the neuroprotective effects of the selected articles are mainly associated with concentrations, amounts and routes of administration that do not correspond to the consumption of phenolic compounds through the diet.