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Introduction to special issue on Polyphenols and Health.
Oteiza, PI, Heiss, C
Archives of biochemistry and biophysics. 2018;:1-2
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Polyphenol-rich curry made with mixed spices and vegetables increases postprandial plasma GLP-1 concentration in a dose-dependent manner.
Haldar, S, Chia, SC, Henry, CJ
European journal of clinical nutrition. 2018;(2):297-300
Abstract
Glucagon-like peptide-1 (GLP-1) plays an important role in glucose homeostasis. Evidence is emerging that dietary bioactive phytochemicals such as polyphenols can increase GLP-1 concentration in vivo. Spices are rich in polyphenols and have oro-sensory properties, both of which can increase GLP-1 secretion. We therefore investigated the effects of mixed spices intake on postprandial GLP-1 concentration. Using a randomised, controlled, dose-response crossover trial in 20 young, healthy, Chinese men, volunteers were served white rice with 3 doses of curry made with mixed spices and vegetables. These test meals were isocaloric and macronutrient matched. Plasma total GLP-1 concentrations were measured before (baseline) and for up to 3 h after the consumption of test meals. We found a significant dose dependent increase in total AUC of plasma GLP-1 concentrations, adjusted for baseline, with increasing mixed spice doses [adjusted mean (±SEM) of 10568.3 ± 1267.9, 12391.8 ± 1333.94, and 13905.1 ± 1267.6 pg ml-1.min for Dose 0 Control, Dose 1 Curry and Dose 2 Curry respectively (p = 0.019)]. Consumption of polyphenol rich mixed spices and vegetables can therefore increase in vivo GLP-1 concentration.
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Effects of grape consumption on biomarkers of inflammation, endothelial function, and PBMC gene expression in obese subjects.
Bardagjy, AS, Hu, Q, Giebler, KA, Ford, A, Steinberg, FM
Archives of biochemistry and biophysics. 2018;:145-152
Abstract
This study investigated effects of grape consumption on biomarkers of cardiovascular health in obese participants in both postprandial and chronic settings. Twenty obese adults participated in this randomized, placebo controlled, double-blinded crossover trial. Participants were randomized to consume 60 g freeze-dried polyphenol-rich whole grape powder (GP) or placebo (PBO) followed by high fat high carbohydrate (HFHC) meal challenge. Following acute challenge, participants consumed their respective treatment daily for 4 weeks to determine effects of chronic consumption. Consumption of GP with HFHC meal significantly increased nuclear factor (erythroid-derived 2)-like 2 (NRF2) expression in peripheral blood mononuclear cells (PBMC) at 3 h (p < 0.05) and decreased plasma endothelin-1 (ET-1) concentration at 5 h (p < 0.05) after meal challenge compared with PBO. Following 4 weeks of daily GP consumption, soluble vascular cell adhesion molecule 1 (sVCAM-1) plasma concentration increased compared with PBO (p < 0.05), however baseline values differed between treatments. In conclusion, GP consumption resulted in decreased vasoconstrictor ET-1 concentration and increased gene expression related to oxidative stress defense following HFHC meal. Except for increase in sVCAM-1 concentration, 4 weeks of chronic GP consumption had little effect on cardiovascular biomarkers measured in this study. This trial was registered: clinicaltrials.gov NCT01674231.
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Production of plant-derived polyphenols in microorganisms: current state and perspectives.
Milke, L, Aschenbrenner, J, Marienhagen, J, Kallscheuer, N
Applied microbiology and biotechnology. 2018;(4):1575-1585
Abstract
Plants synthesize several thousand different polyphenols of which many have the potential to aid in preventing or treating cancer, cardiovascular, and neurodegenerative diseases. However, plants usually contain complex polyphenol mixtures impeding access to individual compounds in larger quantities. In contrast, functional integration of biosynthetic plant polyphenol pathways into microorganisms allows for the production of individual polyphenols as chemically distinct compounds, which can be synthesized in large amounts and can be more easily isolated. Over the last decade, microbial synthesis of many plant polyphenols could be achieved, and along the way, many decisive bottlenecks in the endogenous microbial host metabolism as well as in the heterologous plant pathways could be identified. In this review, we present recent advancements in metabolic engineering of microorganisms for the production of plant polyphenols and discuss how current challenges could be addressed in the future.
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Polyphenols Have No Impact on Endothelial Function in Patients with Obstructive Sleep Apnea: A Randomized Controlled Trial.
Trzepizur, W, Bironneau, V, Recoquillon, S, Priou, P, Meslier, N, Hamel, JF, Henni, S, Darsonval, A, Messaoudi, K, Martínez, MC, et al
The Journal of nutrition. 2018;(4):581-586
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Abstract
BACKGROUND Endothelial dysfunction, a pathophysiologic determinant of atherogenesis, has been found to occur in obstructive sleep apnea syndrome (OSA) and is improved by continuous positive airway pressure (CPAP). However, the efficacy of CPAP therapy is limited by variable adherence. Alternative treatment strategies are needed. The impact of polyphenols on endothelial function has never been evaluated in OSA. OBJECTIVE We evaluated the impact of 1-mo supplementation with grape juice polyphenols (GJPs) on the reactive hyperemia index (RHI), a validated measure of endothelial function in patients with severe OSA. METHODS Forty participants [75% men, median (IQR) age: 61 y (34, 64 y), BMI (in kg/m2): 30.6 (20.9, 33.7)] with severe OSA [median apnea-hypopnea index 43/h (33/h, 56/h)] were randomly assigned to receive GJPs (300 mg/d; n = 20) or placebo (n = 20) for 1 mo. The primary outcome was the change in RHI between baseline and after 1 mo of GJPs or placebo. Secondary outcome measures included changes in blood pressure (BP), heart rate (HR), and polysomnographic indexes. RESULTS No significant differences in RHI and BP outcomes were observed between the GJPs and placebo groups. A significant between-group difference was observed for HR changes [-1 bpm (-5, +5 bpm) in the GJPs group compared with +6 bpm (+3, +10 bpm) in the placebo group; P = 0.001]. A significant decrease in total sleep time was observed in the GJPs group compared with the placebo group [-10 min (-33, 6 min) compared with +15 min (-12, 40 min), respectively; P = 0.02], with no between-group differences in the distribution of sleep stages. CONCLUSIONS In participants with severe OSA and no overt cardiovascular disease, 1-mo GJP supplementation had no effect on endothelial function. This trial was registered at clinicaltrials.gov as NCT01977924.
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Prospective Association between Total and Specific Dietary Polyphenol Intakes and Cardiovascular Disease Risk in the Nutrinet-Santé French Cohort.
Adriouch, S, Lampuré, A, Nechba, A, Baudry, J, Assmann, K, Kesse-Guyot, E, Hercberg, S, Scalbert, A, Touvier, M, Fezeu, LK
Nutrients. 2018;(11)
Abstract
BACKGROUND Epidemiological and experimental evidence support a protective effect of dietary polyphenols on chronic diseases, but high quality longitudinal data are needed, including details on categories of polyphenols. Our objective was to investigate the prospective association between total and individual classes and subclasses of dietary polyphenols and the risk of major cardiovascular disease in the NutriNet-Santé cohort. METHODS A total of 84,158 participants, who completed at least three 24 h dietary records, were included between May 2009 and June 2017. Individual polyphenols intakes were obtained by matching food consumption data from the 24 h dietary records with the Phenol-Explorer polyphenol composition database. Multivariable Cox proportional hazards models were used to characterize the associations between dietary polyphenols and the incidence of cardiovascular diseases, comparing tertile T3 vs. T1 of classes and subclasses of polyphenols. RESULTS Over a median of 4.9 years of follow-up, 602 major cardiovascular events were diagnosed. Intakes of anthocyanins, catechins, and flavonols were strongly inversely associated with cardiovascular disease risk (anthocyanins: Hazard Ratio (HR)for a 1-point increment of 10 mg/day = 0.98 (0.96⁻0.99, p = 0.03, HRT3vs.T1 = 0.66 (0.52⁻0.83), ptrend = 0.0003; catechins: HRfor a 1-point increment of 10 mg/day = 0.98 (0.96⁻0.99), p = 0.02, HRT3vs.T1 = 0.74 (0.60⁻0.91), ptrend = 0.004; flavonols: HRfor a 1-point increment of 10 mg/day = 0.94 (0.90⁻0.99), p = 0.02, HRT3vs.T1 = 0.75 (0.61⁻0.94), ptrend = 0.006). Intakes of dihydrochalcones, proanthocyaninidins, dihydroflavonols, hydroxybenzoic acids, and stilbenes were also associated with a decrease (13%, 19%, 24%, 24%, and 27%, respectively) in cardiovascular disease risk, when comparing tertile T3 to T1. CONCLUSIONS Higher intakes of polyphenols, especially of anthocyanins, catechins, and flavonols, were associated with a statistically significant decreased cardiovascular disease risk.
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A randomised controlled trial exploring the effects of different beverages consumed alongside a nitrate-rich meal on systemic blood pressure.
McDonagh, ST, Wylie, LJ, Morgan, PT, Vanhatalo, A, Jones, AM
Nutrition and health. 2018;(3):183-192
Abstract
BACKGROUND Ingestion of nitrate (NO3-)-containing vegetables, alcohol and polyphenols, separately, can reduce blood pressure (BP). However, the pharmacokinetic response to the combined ingestion of NO3- and polyphenol-rich or low polyphenol alcoholic beverages is unknown. AIM:: The aim of this study was to investigate how the consumption of low and high polyphenolic alcoholic beverages combined with a NO3--rich meal can influence NO3- metabolism and systemic BP. METHODS In a randomised, crossover trial, 12 normotensive males (age 25 ± 5 years) ingested an acute dose of NO3- (∼6.05 mmol) in the form of a green leafy salad, in combination with either a polyphenol-rich red wine (NIT-RW), a low polyphenol alcoholic beverage (vodka; NIT-A) or water (NIT-CON). Participants also consumed a low NO3- salad and water as a control (CON; ∼0.69 mmol NO3-). BP and plasma, salivary and urinary [NO3-] and nitrite ([NO2-]) were determined before and up to 5 h post ingestion. RESULTS Each NO3--rich condition elevated nitric oxide (NO) biomarkers when compared with CON ( P < 0.05). The peak rise in plasma [NO2-] occurred 1 h after NIT-RW (292 ± 210 nM) and 2 h after NIT-A (318 ± 186 nM) and NIT-CON (367 ± 179 nM). Systolic BP was reduced 2 h post consumption of NIT-RW (-4 mmHg), NIT-A (-3 mmHg) and NIT-CON (-2 mmHg) compared with CON ( P < 0.05). Diastolic BP and mean arterial pressure were also lower in NIT-RW and NIT-A compared with NIT-CON ( P < 0.05). CONCLUSIONS A NO3--rich meal, consumed with or without an alcoholic beverage, increases plasma [NO2-] and lowers systemic BP for 2-3 h post ingestion.
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A prospective evaluation of plasma polyphenol levels and colon cancer risk.
Murphy, N, Achaintre, D, Zamora-Ros, R, Jenab, M, Boutron-Ruault, MC, Carbonnel, F, Savoye, I, Kaaks, R, Kühn, T, Boeing, H, et al
International journal of cancer. 2018;(7):1620-1631
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Abstract
Polyphenols have been shown to exert biological activity in experimental models of colon cancer; however, human data linking specific polyphenols to colon cancer is limited. We assessed the relationship between pre-diagnostic plasma polyphenols and colon cancer risk in a case-control study nested within the European Prospective Investigation into Cancer and Nutrition study. Using high pressure liquid chromatography coupled to tandem mass spectrometry, we measured concentrations of 35 polyphenols in plasma from 809 incident colon cancer cases and 809 matched controls. We used multivariable adjusted conditional logistic regression models that included established colon cancer risk factors. The false discovery rate (qvalues ) was computed to control for multiple comparisons. All statistical tests were two-sided. After false discovery rate correction and in continuous log2 -transformed multivariable models, equol (odds ratio [OR] per log2 -value, 0.86, 95% confidence interval [95% CI] = 0.79-0.93; qvalue = 0.01) and homovanillic acid (OR per log2 -value, 1.46, 95% CI = 1.16-1.84; qvalue = 0.02) were associated with colon cancer risk. Comparing extreme fifths, equol concentrations were inversely associated with colon cancer risk (OR = 0.61, 95% CI = 0.41-0.91, ptrend = 0.003), while homovanillic acid concentrations were positively associated with colon cancer development (OR = 1.72, 95% CI = 1.17-2.53, ptrend < 0.0001). No heterogeneity for these associations was observed by sex and across other colon cancer risk factors. The remaining polyphenols were not associated with colon cancer risk. Higher equol concentrations were associated with lower risk, and higher homovanillic acid concentrations were associated with greater risk of colon cancer. These findings support a potential role for specific polyphenols in colon tumorigenesis.
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Red wine polyphenols do not improve obesity-associated insulin resistance: A randomized controlled trial.
Woerdeman, J, Del Rio, D, Calani, L, Eringa, EC, Smulders, YM, Serné, EH
Diabetes, obesity & metabolism. 2018;(1):206-210
Abstract
Preclinical studies have suggested that polyphenols extracted from red wine (RWPs) favourably affect insulin sensitivity, but there is controversy over whether RWPs exert similar effects in humans. The aim of the present study was to determine whether RWPs improve insulin sensitivity in obese volunteers. Obese (body mass index >30 kg/m2 ) volunteers were randomly allocated to RWPs 600 mg/d (n = 14) or matched placebo (n = 15) in a double-blind parallel-arm study for 8 weeks. The participants were investigated at baseline and at the end of the study. Insulin sensitivity was determined using a hyperinsulinaemic-euglycaemic clamp (M-value), a mixed-meal test (Matsuda index), and homeostatic model assessment of insulin resistance (HOMA-IR). RWPs elicited no significant changes in M-value (RWP group: median [interquartile range; IQR] baseline 3.0 [2.4; 3.6]; end of study 3.3 [2.4; 4.8] vs placebo group: median [IQR] baseline 3.4 [2.8; 4.4]; end of study 2.9 [2.8; 5.9] mg/kg/min; P = .65), in Matsuda index (RWP group: median [IQR] baseline 3.3 [2.2; 4.8]; end of study 3.6 [2.4; 4.8] vs placebo group: median [IQR] baseline 4.0 [3.0; 6.0]; end of study 4.0 [3.0; 5.2]; P = .88), or in HOMA-IR. This study showed that 8 weeks of RWP supplementation did not improve insulin sensitivity in 29 obese volunteers. Our findings were not consistent with the hypothesis that RWPs ameliorate insulin resistance in human obesity.
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Impact of chocolate on the cardiovascular health.
Gammone, MA, Efthymakis, K, Pluchinotta, FR, Bergante, S, Tettamanti, G, Riccioni, G, D'Orazio, N
Frontiers in bioscience (Landmark edition). 2018;(5):852-864
Abstract
The antioxidants such as polyphenols, especially flavonols, present in large quantitites in cocoa, cause vasodilation, modulate inflammatory markers and cardiovascular health, and possess a range of protective cardiovascular effects. On the other hand, overconsumption of chocolate can lead to tachyarrhythmias, supraventricular tachycardia, atrial fibrillation, ventricular tachycardia and ventricular fibrillation due to its caffeine content. This review describes both the cardioprotective and adverse effects of chocolate and its constituents.