Plasma levels of UA were quantified using colorimetric kits (Sentinel CH. PLIR reduced the sample size to D-Pinitol reach statistical significance, compared to the resistance to an exogenous oxidative stress and to the functional capacity of oxidative burst. Therefore , PLIR could be a sensitive marker of redox status. == 1 . Introduction == The Supplement Information Expert Committee (DSI Rabbit Polyclonal to PHLDA3 EC) indicated that consumption of green tea extract (GTE) could induce liver damage [1]. In fact , there are an increasing number of case reports of hepatotoxicity in humans associated with intake of green tea (GT) dietary supplements [27]. The types of preparation responsible for the adverse effects were hydroalcoholic extract and aqueous extract of GT, consumed because tea or in capsules [7]. However , additionally, there are cases reporting hepatotoxicity after D-Pinitol GT infusion [27]. In particular, a case has been reported with features mimicking autoimmune hepatitis, with abnormal liver histology and elevated levels of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, gamma glutamyl-transferase and bilirubin, associated with hypergammaglobulinemia, and the transient presence of anti-smooth-muscle antibodies (ASMA) and anti-neutrophil cytoplasmic antibodies (ANCA) [8]. GT withdrawal resulted in a slow and continuous improvement with a total resolution after 7 months [8]. Furthermore, the Food and Drug Administration (FDA) and the European Food Security Administration (EFSA) have denied the proposed health statements for GT and decreased risk of noncommunicable diseases [9]. In particular, despite GT increased plasma nonenzymatic antioxidant capacity (NEAC) [10], the EFSA denied statements related to D-Pinitol tea and protection of DNA and lipids from oxidative damage [9]. GT contains several flavonoids with antioxidant properties, in particular the flavanol monomers known as catechins, where epigallocatechin-3-gallate (EGCG) is the most effective antioxidant compound [11]. However , tea catechins could have also prooxidant activity [11]. Besides, some of the protective effects of EGCG have been ascribed to its capability to reduce excessive uric acid (UA) level D-Pinitol [12]. In particular, flavanols ofCamellia sinensismodulate both xanthine oxidase and urate transport [13]. UA is the major plasma antioxidant and contributes to plasma nonenzymatic antioxidant capacity [10]. The peroxidation of leukocytes index ratio (PLIR) measures the resistance of leukocytes to exogenous oxidative stress and their functional capacity of oxidative burst upon activation [14]. Therefore , we performed a pilot study in order to evaluate the effect of a single dose of a GTE supplement on the PLIR, in relation to plasma UA and ferric reducing antioxidant potential (FRAP) [15], as well as the sample size to reach statistical significance. == 2 . Material and Methods == == 2 . 1 . Subjects and Treatment == Participants (6 men and 4 women, 1935 years old) to the study, who volunteered in response to advertisements, were healthy, nonsmokers and were taking no supplements. For two days prior to each feeding study the subjects followed a low antioxidant diet (washout) by avoiding all fresh fruit, vegetables, tea, coffee, cocoa, fruit juices, and wine. On the day of the study, after an overnight fast, venous blood samples were collected (in EDTA-tubes) before (T0), 30 minutes (T0. 5), and 3 hours (T3) after a single dose of two capsules of a GTE (200 mg 2), commercially D-Pinitol available in Italy (cod. 1820, REGISTRO INTEGRATORIhttps://www.salute.gov.it/imgs/C_17_pagineAree_3668_listaFile_itemName_1_file.pdf). == 2 . 2 . Plasma Uric Acid and TAC == The plasma was separated by centrifugation at 1300 g at 4C for 15 min and stored at 80C. Plasma levels of UA were quantified using colorimetric kits (Sentinel CH. SpA, Italy). Plasma TAC was measured with the FRAP assay [15]. We calculated also the uric acid- independent FRAP (FRAP-UA) because previously explained [16], applying the formula: == 2 . a few. PLIR Method == After red blood cells’ lysis and 4, 4-difluoro-5-(4-phenyl-1, 3-butadienyl)-4-bora-3a, 4a-diaza-s-indacene-3-undecanoic acidity (C11-BODIPY, Invitrogen, final concentration 1M) staining, leukocytes were treated because previously explained [14, 17] with phorbol 12-myristate 13-acetate (PMA, Sigma, final concentration 1g/mL), 2, 2-azobis(2-methylpropionamidine) dihydrochloride (AAPH, Sigma, final concentration 10 mM), 6-hydroxy-2, 5, 7, 8-tetramethylchroman-2-carboxylic acid (Trolox, Sigma, final concentration 10M), PMA 1g/mL + Trolox 10M, or AAPH 10 mM + Trolox 10M. After 30 min at 37C cells were stored in ice, to stop reactions, and rapidly analyzed on an Accuri C6 BD cytometer. Data acquired around the Accuri C6 was exported in FCS format and analyzed by FCS express software (De Novo Software) to calculate the ratio of oxidation of.