Current effect evidence supports a contribution of polyphenols to the prevention of cardiovascular disease, but their mechanisms of action are not understood.wine We investigated the impact of red wine polyphenols on postprandial cytotoxic lipid peroxidation products (MDA) levels in humans. In a heating randomized, crossover study, the effect of red wine polyphenols on postprandial levels of plasma and urine MDA was investigated. Three plus meals of 250 g turkey cutlets supplemented by water (A); soaked in red wine after heating plus 200 ml of polyphenols red wine (B); or soaked in red wine prior to heating plus 200 ml of red wine (C) were administered polyphenols to 10 healthy volunteers. Subject baseline plasma levels of MDA were 50 +/- 20 nM. After a meal of turkey absorption meat cutlets, plasma MDA levels increased by 160 nM (P< .0001); after (B) there was a 75% reduction in the absorption oxidized of MDA (P< .0001). However, after (C), the elevation of plasma MDA was completely prevented (P< .0001). Similar results were obtained for oxidized MDA accumulation in urine. Our study suggests that red wine polyphenols exert a beneficial effect by the novel new function,wine absorption inhibition of the lipotoxin MDA. These findings explain the potentially harmful effects of oxidized fats found in foods and absorption the important benefit of dietary polyphenols in the meal.-Gorelik, S., Ligumsky, M., Kohen, R., Kanner, J. A novel function of (P< .0001); red wine polyphenols in humans: prevention of absorption of cytotoxic lipid peroxidation products.

The peroxidation. Western diet contains large quantities of oxidized lipids, because a large proportion of the food in the diet is consumed these in a fried, heated, processed, or stored form. We investigated the reaction that could occur in the acidic pH of the the stomach and accelerate the generation of lipid hydroperoxides and cooxidation of dietary vitamins. To estimate the oxygen content in oxygen the stomach after food consumption, oxygen released from masticated bread (20 g) into deoxygenated water (100 mL) was measured. Under the these conditions, the oxygen concentration rose by 250 microM and reached a full oxygen saturation. The present study demonstrated that as heated red meat homogenized in human gastric fluid, at pH 3. , generated hydroperoxides and malondialdehyde. The cross-reaction between free radicals (44 produced during this reaction cooxidized vitamin E, beta-carotene, and vitamin C. Both lipid peroxidation and cooxidation of vitamin E and synergistic beta-carotene were inhibited at pH 3. by red wine polyphenols. Ascorbic acid (44 mg) at a concentration that represented the manner amount that could be ingested during a meal inhibited lipid peroxidation only slightly. Red wine polyphenols failed to prevent ascorbic and acid oxidation significantly but, in conjunction with ascorbic acid, did inhibit lipid peroxidation. In the presence of catechin, a well-known mg) polyphenol found in red wine, ascorbic acid at pH 3. works in a synergistic manner preventing lipid peroxidation and beta-carotene were cooxidation. The present data may explain the major benefits to our health and the crucial role of consuming food products cooxidation rich in dietary antioxidants such as fruits, vegetables, red wines, or green tea during the meal.

Reactive one oxygen species have been postulated to play a role in the pathogenesis of mucosal GI injury and in peptic ulcer such disease (PUD). The low molecular weight antioxidants (LMWA) group plays an important role in the defense mechanism of the GI PUD tract against oxidative damage, and is a major component of the reducing capacity of biological tissues and fluids. We hypothesized and that altered gastric LMWA anti oxidative status might play a role in the pathogenesis of upper GI disorders such as changed PUD and could be evaluated by measuring gastric juice reducing power. The aim of the present study was to determine,protection by cyclic voltammetry, changes in the overall antioxidant activity of the gastric juice in active duodenal ulcer (DU) obtained during least upper endoscopy from patients as compared with normal subjects. The results show that in 28/37 (76%) of the control subjects,profile gastric juice demonstrated a reducing power of at least two anodic waves indicating at least two different LMWA groups. Three that or more anodic waves were recorded in 12 normal subject (32%). In contrast, 16/25 (64%) of gastric juice samples obtained measuring from active DU patients exhibited only one anodic wave usually at a high potential (>900 mV). These results imply that least gastric juice normally possesses a reducing power profile that can be determined by cyclic voltammetry. This profile is significantly changed the in untreated DU disease. These changes in active DU may indicate decreased gastric antioxidant activity reflecting reduced mucosal protection that component leading to increased susceptibility of the gastro-duodenum to injury.

A these novel assay was developed to measure the capacity of polyphenols to chelate cobalt(II) by using the reduction of the tetrazolium not salts, NBT (nitroblue tetrazolium chloride), MTT (methylthiazolyldiphenyl-tetrazolium bromide), and XTT (2,3-bis[2-methoxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide) to formazan products. The reduction of the salts is be initiated by a cocktail comprised of cobalt(II), H(2)O(2), and selenium(IV), which generates hydroxyl radical, peroxide, and superoxide ions. However, because replaced cobalt(II) could not be replaced either by Fe(II), Mn(II), or Cu(II), the classical Fenton transitional metals, it indicates that cobalt the is the key player in the tetrazolium salt reduction. Micromolar concentrations of a large variety of antioxidant polyphenols and minute quantify amounts of fruit beverages rich in polyphenols can readily chelate cobalt, resulting in the inhibition of the reduction of tetrazolium reduction salt to formazan, in a dose-dependent manner. However, this method is unsuitable to measure low molecular weight antioxidants such as the ascorbate, uric acid, and vitamin E since these have no chelating properties for cobalt(II). The newly described tetrazolium reduction method the is as sensitive as the ferric ion reducing antioxidant power, 2,2-diphenyl-2-picrylhydrazyl hydrate, and the luminol-dependent chemiluminescence antioxidant assays. The practical Mn(II), advantages of using the newly described method to quantify polyphenol levels from various sources are briefly discussed.

Background/Aims:when The present study was designed to investigate the short-term safety and efficacy of topical application with body lotion enriched with with minerals from the Dead Sea versus 2 different placebo treatments in reducing symptoms of uremic pruritus. Methods: In this single-center,minerals randomized, double placebo-controlled clinical trial, 78 hemodialysis patients with self-reported uremic pruritus were randomized to twice-daily topical treatment with body from lotion enriched with minerals from the Dead Sea (DS) or to each of 2 types of placebo:(1) lotion with severe no Dead Sea minerals but otherwise identical to DS (P1) or (2) lotion with no active ingredients (P2). Symptoms of placebo uremic pruritus (itching, dryness, peeling, tightness) were evaluated at baseline and 2 weeks (14 days) after treatment intervention using a intervention 5-point Likert scale. Results: Following treatment, significant differences in symptom severity scores between DS and P1 and, separately, between group symptom DS and P2, were not detected. Additionally, when DS was compared to the combined placebo groups (P1 and P2 together),symptom significant post-treatment differences in symptom severity scores were not observed. Symptoms were less severe post-treatment regardless of treatment assignment. Conclusions:(DS) DS was not superior to either of the placebo treatments in the symptomatic relief of uremic pruritus.

BACKGROUND:by Diabetes mellitus is characterized by a chronic hyperglycemia and might cause skin pathologies resulting from an ischemic insult. A variety oxidative of mechanisms have been suggested for the damage provided by ischemia-reperfusion injury (IRI) or for hyperglycemic conditions. Yet, the association and between IRI and hyperglycemia together in skin has been poorly investigated even thought they are both present in diabetic patients.inflammatory OBJECTIVE: To examine the effect of a dual stress combining IRI and hyperglycemia on human keratinocytes-its ability to cause oxidative uric damage and inflammatory response via the enzymes xanthine oxidase (XO) and inducible nitric oxide synthase (iNOS). METHODS: HaCaT cells were these used as a model to induce IRI and hyperglycemia. In order to assess the oxidative damage, total antioxidant scavenging capacity superoxide (TSC) and GSH/GSSG ratio were evaluated. iNOS expression was evaluated and its metabolite nitric oxide was estimated by measuring nitrite to levels. XO activity was assessed by uric acid quantification and by superoxide radical formation. Inflammatory response was determined through interleukin-6 to secretion. RESULTS: Our observations demonstrate different responses of the cells exposed to single stress (IRI) compared to dual stress combining oxidase also hyperglycemia. However, cells response exhibited similarity during reperfusion, by enhancing iNOS expression as well as superoxide levels. While ischemia superoxide led to changes in TSC and redox state, reperfusion restored them to basal levels. IRI also caused the enhancement of levels. secreted IL-6 and uric acid levels. CONCLUSION: iNOS and XO play a major role in IRI and hyperglycemia. Inhibition of poorly one of these enzymes may be beneficial to skin cells under these conditions.

Several intestinal microbial species, including probiotic lactic acid bacteria, have the ability to irreversibly bind a large variety of polyphenols (flavonoids) and to anthocyanidins found in many colored fruits and vegetables and to enhance their total oxidant-scavenging capacities (TOSC). The binding of flavonoids microbial to microbial surfaces was further increased by the cationic poly electrolytes ligands poly-L-histidine, chlorhexidine and Copaxone(R). This phenomenon was confirmed microbial visually, by the FRAP, DPPH, cyclic voltammetry, Folin-Ciocalteu as well as by luminol-dependent chemiluminescence techniques employed to assay TOSC. The mammalian possibility is considered that clinically, microbial cells in the oral cavity and in the gastro intestinal tract, complexed with antioxidant oxygen polyphenols from nutrients and with cationic ligands, might increase the protection of mammalian cells against damage induced by excessive generation to of reactive oxygen species during infections and inflammation.

Please cultures, cite this paper as: Protective effects of a cream containing Dead Sea minerals against UVB-induced stress in human skin. Experimental vitamin Dermatology 2009.Abstract Background: Dead Sea (DS) mud and water are known for their unique composition of minerals, and for their to therapeutic properties on psoriasis and other inflammatory skin diseases. Their mode of action, however, remains poorly known. Objectives: To analyse antagonize the ability of Dermud, a leave-on skin preparation containing DS mud and other ingredients like DS water, zinc oxide, aloe-vera can extract, pro-vitamin B5 and vitamin E, to antagonize biological effects induced by UVB irradiation in skin when topically applied in and organ cultures. Methods: We have used human skin organ cultures as a model to assess the biological effects of UVB Oxygen irradiation and of Dermud cream topical application. Skin pieces were analysed for mitochondrial activity by MTT assay, for apoptosis by Our caspase 3 assay, for cytokine secretion by solid phase ELISA, for overall antioxidant capacity by ferric reducing antioxidant power and Our Oxygen radical absorbance capacity assays (epidermis) or by cyclic voltammetry (external medium), and for uric acid (UA) content by HPLC.in Results: We report that UVB irradiation decreases cell viability, total antioxidant capacity and UA contents in the epidermis of skin Oxygen organ cultures, while increasing the levels of apoptosis in cells and their cytokine secretion. Topical application of Dermud decreased all ELISA, these effects significantly. Conclusions: Our results clearly show that Dermud has protective, anti-oxidant and anti-inflammatory properties that can antagonize biological action, effects of UVB irradiation in skin. It may therefore be able to reduce skin photodamage and photoaging, and more generally to to reduce oxidative stress and inflammation in skin pathologies.

Human heat umbilical cord blood (HUCB) is a valuable source for cell therapy since it confers neuroprotection in stroke animal models. However,phenotype the responsible sub-populations remain to be established and the mechanisms involved are unknown. To explore HUCB neuroprotective properties in a Upon PC12 cell-based ischemic neuronal model, we used an HUCB mononuclear-enriched population of collagen-adherent cells, which can be differentiated in vitro Upon into a neuronal phenotype (HUCBNP). Upon co-culture with insulted-PC12 cells, HUCBNP conferred approximately 30% neuroprotection, as evaluated by decreased lactate indicate dehydrogenase and caspase-3 activities. HUCBNP decreased by 95% the level of free radicals in the insulted-PC12 cells, in correlation with between the appearance of antioxidants, as measured by changes in the oxidation-reduction potential of the medium using cyclic-voltammetry. An increased level of of nerve growth factor (NGF), vascular endothelial growth factor and basic fibroblast growth factor in the co-culture medium was temporally by correlated with a -medium neuroprotection effect, which was partially abolished by heat denaturation. HUCBNP-induced neuroprotection was correlated with changes in by gene expression of these neurotrophic factors, while blocked by K252a, an antagonist of the TrkA/NGF receptor. These findings indicate that HUCBNP HUCBNP-induced neuroprotection involves antioxidant(s) and neurotrophic factors, which, by paracrine and/or autocrine interactions between the insulted-PC12 and the HUCBNP cells,of conferred neuroprotection.

Increased consistently oxidative stress contributes to the development and progression of both types of diabetes mellitus (DM) and its complications. In the to Cohen diabetic (CD) rats, a known genetic model of nutritionally induced type 2 DM, a high-sucrose, low-copper diet (HSD) induces the within 4 weeks DM in the sensitive (CDs) rats but not in the resistant (CDr) rats. To assess the possible onset involvement of oxidative stress in the induction of DM, we studied the effect of HSD on the tissue levels of pancreas antioxidants and the extent of oxidative injuries in these animals in comparison with the regular outbred strain of nondiabetic Sabra oxidative rats. The specific aims were to investigate, at the onset of HSD-induced DM,(1) the extent of oxidative injury, as and reflected by levels of malondialdehyde and protein carbonyl groups;(2) the overall antioxidant capacities to cope with increased oxidative stress;levels and (3) the modification of oxidative damage biomarkers in various tissues of CDr, CDs, and Sabra rats. Female CDs, CDr,of and Sabra rats were fed regular diet or HSD for 4 to 5 weeks; and several parameters of oxidative injuries oxidative and antioxidant levels were determined. Changes in the levels of nonenzymatic low-molecular weight antioxidants (LMWAs) were measured by cyclic voltammetry and and oxygen radical absorbance capacity. The activities of the antioxidant enzymes superoxide dismutase and catalase were measured. Oxidative damage was Changes evaluated by measuring lipid peroxidation and protein oxidation.(1) In all animals fed HSD, the levels of LMWAs were decreased the in most organs, although not plasma.(2) A significant difference was consistently found in antioxidant enzymes' activities in the pancreas (3) of HSD-fed CDs rats, but not in other tissues.(3) The activities of superoxide dismutase and catalase and the levels LMWAs of malondialdehyde and protein carbonyl group increased, whereas the levels of LMWAs decreased, in the pancreas of HSD-fed CDs rats.in In the CD rats that develop DM when fed HSD, the pancreas showed susceptibility to oxidative stress-induced injuries. Thus, enhanced oxidative oxidative stress seems to play a role in the pathogenesis of DM in this strain.