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Bayer J, Högger P. Review of the pharmacokinetics of French maritime pine bark extract (Pycnogenol ®) in humans. Front Nutr 2024; 11:1389422. [PMID: 38757126 PMCID: PMC11096517 DOI: 10.3389/fnut.2024.1389422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 04/23/2024] [Indexed: 05/18/2024] Open
Abstract
The French maritime pine bark extract Pycnogenol® is a proprietary product from Pinus pinaster Aiton. It complies with the quality specifications in the United States Pharmacopeia monograph "Pine extract" in the section of dietary supplements. Pycnogenol® is standardized to contain 65-75% procyanidins which are a variety of biopolymers consisting of catechin and epicatechin monomeric units. The effects of Pycnogenol® have been researched in a multitude of human studies. The basis for any in vivo activity is the bioavailability of constituents and metabolites of the extract. General principles of compound absorption, distribution, metabolism and elimination as well as specific data from studies with Pycnogenol® are summarized and discussed in this review. Based on plasma concentration profiles it can be concluded that low molecular weight constituents of the extract, such as catechin, caffeic and ferulic acid, taxifolin are readily absorbed from the small intestine into systemic circulation. Procyanidin oligomers and polymers are subjected to gut microbial degradation in the large intestine yielding small bioavailable metabolites such as 5-(3',4'-dihydroxyphenyl)-γ-valerolactone. After intake of Pycnogenol®, constituents and metabolites have been also detected in blood cells, synovial fluid and saliva indicating a substantial distribution in compartments other than serum. In studies simultaneously investigating concentrations in different specimen, a preferential distribution of individual compounds has been observed, e.g., of ferulic acid and 5-(3',4'-dihydroxyphenyl)-γ-valerolactone into synovial fluid compared to serum. The main route of elimination of constituents and metabolites of the French pine bark extract is the renal excretion. The broad knowledge accumulated regarding the pharmacokinetics of compounds and metabolites of Pycnogenol® constitute a rational basis for effects characterized on a cellular level and observed in human clinical studies.
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Affiliation(s)
| | - Petra Högger
- Institut für Pharmazie und Lebensmittelchemie, Universität Würzburg, Würzburg, Germany
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Weichmann F, Rohdewald P. Pycnogenol ® French maritime pine bark extract in randomized, double-blind, placebo-controlled human clinical studies. Front Nutr 2024; 11:1389374. [PMID: 38757130 PMCID: PMC11096518 DOI: 10.3389/fnut.2024.1389374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 04/22/2024] [Indexed: 05/18/2024] Open
Abstract
Pycnogenol® French maritime pine bark extract is a well-known and thoroughly studied patented extract from the bark of Pinus pinaster Ait. ssp. Atlantica. In 39 randomized double-blind, placebo-controlled (RDP) human clinical trials including 2,009 subjects, Pycnogenol® French maritime pine bark extract supplementation for two weeks to six months has been shown to beneficially affect cardiovascular health, chronic venous insufficiency, cognition, joint health, skin health, eye health, women's health, respiratory health and allergies, oral health and sports performance. The mechanisms of action that can explain the respective effects on different conditions in the human body are discussed as well. As investigated in several in vitro, in vivo and in clinical studies, Pycnogenol® French maritime pine bark extract showed antioxidative effects, anti-inflammatory abilities, beneficial effects on endothelial function and reinforcing effects on the extracellular matrix. The present review aims to give a comprehensive overview of currently available "gold standard" RDP trials of Pycnogenol®'s benefits across various health domains compared to placebo. In addition, some of the processes on which the presented effects of Pycnogenol® French maritime pine bark extract are based will be elucidated and discussed. This broad overview of RDP studies on Pycnogenol® in different health domains can be used as a basis for further research on applications and mechanisms of this unique French maritime pine bark extract.
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Affiliation(s)
| | - Peter Rohdewald
- Institute of Pharmaceutical Chemistry, Westfälische Wilhelms-Universität Münster, Münster, Germany
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Jasenovec T, Radosinska D, Kollarova M, Balis P, Zorad S, Vrbjar N, Bernatova I, Cacanyiova S, Tothova L, Radosinska J. Effects of Taxifolin in Spontaneously Hypertensive Rats with a Focus on Erythrocyte Quality. LIFE (BASEL, SWITZERLAND) 2022; 12:life12122045. [PMID: 36556410 PMCID: PMC9788412 DOI: 10.3390/life12122045] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/02/2022] [Accepted: 12/05/2022] [Indexed: 12/12/2022]
Abstract
Oxidative stress and multiple erythrocyte abnormalities have been observed in hypertension. We focused on the effects of angiotensin-converting enzyme 2 (ACE2) inhibition by MLN-4760 inhibitor on angiotensin peptides, oxidative stress parameters, and selected erythrocyte quality markers in spontaneously hypertensive rats (SHR). We also investigated the potential effects of polyphenolic antioxidant taxifolin when applied in vivo and in vitro following its incubation with erythrocytes. SHRs were divided into four groups: control, taxifolin-treated, MLN-4760-treated, and MLN-4760 with taxifolin. MLN-4760 administration increased the blood pressure rise independent of taxifolin treatment, whereas taxifolin decreased it in control SHRs. Body weight gain was also higher in ACE2-inhibited animals and normalized after taxifolin treatment. However, taxifolin did not induce any change in angiotensin peptide concentrations nor a clear antioxidant effect. We documented an increase in Na,K-ATPase enzyme activity in erythrocyte membranes of ACE2-inhibited SHRs after taxifolin treatment. In conclusion, ACE2 inhibition deteriorated some selected RBC properties in SHRs. Although taxifolin treatment did not improve oxidative stress markers, our data confirmed the blood pressure-lowering potential, anti-obesogenic effect, and some "erythroprotective" effects of this compound in both control and ACE2-inhibited SHRs. In vitro investigations documenting different effects of taxifolin on erythrocyte properties from control and ACE2-inhibited SHRs accentuated the irreplaceability of in vivo studies.
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Affiliation(s)
- Tomas Jasenovec
- Institute of Physiology, Faculty of Medicine, Comenius University in Bratislava, 813 72 Bratislava, Slovakia
| | - Dominika Radosinska
- Institute of Immunology, Faculty of Medicine, Comenius University in Bratislava, 811 08 Bratislava, Slovakia
| | - Marta Kollarova
- Institute of Physiology, Faculty of Medicine, Comenius University in Bratislava, 813 72 Bratislava, Slovakia
| | - Peter Balis
- Centre of Experimental Medicine, Slovak Academy of Sciences, 841 04 Bratislava, Slovakia
| | - Stefan Zorad
- Institute of Experimental Endocrinology, Biomedical Research Center, Slovak Academy of Sciences, 845 05 Bratislava, Slovakia
| | - Norbert Vrbjar
- Centre of Experimental Medicine, Slovak Academy of Sciences, 841 04 Bratislava, Slovakia
| | - Iveta Bernatova
- Centre of Experimental Medicine, Slovak Academy of Sciences, 841 04 Bratislava, Slovakia
| | - Sona Cacanyiova
- Centre of Experimental Medicine, Slovak Academy of Sciences, 841 04 Bratislava, Slovakia
| | - Lubomira Tothova
- Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University in Bratislava, 811 08 Bratislava, Slovakia
| | - Jana Radosinska
- Institute of Physiology, Faculty of Medicine, Comenius University in Bratislava, 813 72 Bratislava, Slovakia
- Centre of Experimental Medicine, Slovak Academy of Sciences, 841 04 Bratislava, Slovakia
- Correspondence: ; Tel.: +42-12-9011-9526
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Tedesco I, Spagnuolo C, Russo GL, Russo M, Cervellera C, Moccia S. The Pro-Oxidant Activity of Red Wine Polyphenols Induces an Adaptive Antioxidant Response in Human Erythrocytes. Antioxidants (Basel) 2021; 10:antiox10050800. [PMID: 34070135 PMCID: PMC8158335 DOI: 10.3390/antiox10050800] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/13/2021] [Accepted: 05/14/2021] [Indexed: 12/21/2022] Open
Abstract
The protective effect of dealcoholized red wine on human health has been partially associated with its polyphenolic components, suggesting that the pool of polyphenols, including flavonoids and anthocyanins, can be responsible for the functional effects of this beverage. We hypothesize a new role of red wine polyphenols (RWp) in modulating the antioxidant potential of erythrocytes, protecting them against oxidative stress. We previously demonstrated that RWp activated the Plasma Membrane Redox System (PMRS), which is involved in neutralizing plasma free radicals. Here, we investigated the underlying mechanism triggered by RWp in the activation of PMRS via the involvement of GSH. Hence, treatment of human erythrocytes with RWp (73 μg/mL Gallic Acid Equivalents) increased GSH intracellular concentration, which depends upon the activation of glutathione reductase (GR) and glucose-6-phosphate dehydrogenase (G6PD), whose enzymatic activities increase of about 30% and 47%, respectively. Changes in the GSH pathway induced by RWp were associated with a slight but significant increase in reactive oxygen species (ROS). We conclude that the pro-oxidant effect of RWp promoted an adaptive stress response in human erythrocytes, which enhances their antioxidant defense.
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Si H, Lai CQ, Liu D. Dietary Epicatechin, A Novel Anti-aging Bioactive Small Molecule. Curr Med Chem 2021; 28:3-18. [PMID: 31886745 DOI: 10.2174/0929867327666191230104958] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 09/13/2019] [Accepted: 09/26/2019] [Indexed: 11/22/2022]
Abstract
Epicatechin (EC), a flavonoid present in various foods including cocoa, dark chocolate, berries, and tea, has recently been reported to promote general health and survival of old mice fed a standard chow diet. This is considered a novel discovery in the field of identifying natural compounds to extend lifespan, given that presumably popular anti-aging natural agents including resveratrol, green tea extract, and curcumin had failed in extending the lifespan of standard chow-diet-fed mice. However, the anti-aging mechanism of EC is not fully understood, thus impeding the potential application of this natural compound in improving a healthy lifespan in humans. In this review, we first summarized the main dietary sources that contain a significant amount of EC and recent research regarding the absorption, metabolism and distribution of EC in humans and rodents. The review is then focused on the anti-aging effects of EC in cultured cells, animals and humans with the possible physiological, cellular and molecular mechanisms underlying its lifespan-extending effects.
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Affiliation(s)
- Hongwei Si
- Department of Human Sciences, Tennessee State University, Nashville, TN, United States
| | - Chao-Qiang Lai
- USDA Agricultural Research Service, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, United States
| | - Dongmin Liu
- Department of Human Nutrition, Foods and Exercise, Virginia Tech, Blacksburg, VA, United States
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Projected supportive effects of Pycnogenol Ⓡ in patients suffering from multi-dimensional health impairments after a SARS-CoV2 infection. Int J Antimicrob Agents 2020; 56:106191. [PMID: 33045354 PMCID: PMC7546273 DOI: 10.1016/j.ijantimicag.2020.106191] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 09/21/2020] [Accepted: 10/04/2020] [Indexed: 12/15/2022]
Abstract
Corona virus disease 2019 (COVID-19) is triggered by the Severe Acute Respiratory Syndrome Corona Virus 2 (SARS-CoV2) and has rapidly developed into a worldwide pandemic. Unlike other SARS viruses, SARS-CoV2 does not solely impact the respiratory system, but additionally leads to inflammation of endothelial cells, microvascular injuries and coagulopathies, thereby affecting multiple organs. Recent reports of patients who were infected with SARS-CoV2 suggest persistent health problems even months after the initial infection. The French maritime pine bark extract PycnogenolⓇ has demonstrated anti-inflammatory, vascular and endothelium-protective effects in over 90 human clinical studies. It is proposed that PycnogenolⓇ may be beneficial in supporting recovery and mitigating symptoms and long-term consequences resulting from a SARS-CoV2 infection in COVID-19 patients.
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Simpson T, Kure C, Stough C. Assessing the Efficacy and Mechanisms of Pycnogenol ® on Cognitive Aging From In Vitro Animal and Human Studies. Front Pharmacol 2019; 10:694. [PMID: 31333448 PMCID: PMC6619435 DOI: 10.3389/fphar.2019.00694] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 05/28/2019] [Indexed: 12/21/2022] Open
Abstract
Brain aging is a complex and multifactorial process broadly involving changes in the brain's structure, neuronal activity, and biochemical profile. These changes in brain function have also been linked to age-associated variations in cognitive function. Recent research has suggested a role of increased oxidative stress and reduced cognition in older people. Therefore, studies that examine the effects of antioxidants on cognitive performance are important, particularly in the context of an increase in elderly populations in most Western countries. One such antioxidant, Pycnogenol, is a standardized plant-based extract obtained from the bark of the French maritime pine and has a long historical use to treat inflammation and improve health. More recently, Pycnogenol has been subjected to more than 100 research trials. In vitro and animal studies using the standardized extract have indicated a multimodal action of Pycnogenol, and several human studies have shown improvements in cognitive function after chronic administration. In this paper, we review these studies in the context of understanding both biological and cognitive changes due to Pycnogenol and evaluate possibilities of Pycnogenol to improve neurocognitive function.
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Affiliation(s)
- Tamara Simpson
- Swinburne Centre for Human Psychopharmacology, Swinburne University, Melbourne, VIC, Australia
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Verlaet A, van der Bolt N, Meijer B, Breynaert A, Naessens T, Konstanti P, Smidt H, Hermans N, Savelkoul HFJ, Teodorowicz M. Toll-Like Receptor-Dependent Immunomodulatory Activity of Pycnogenol ®. Nutrients 2019; 11:E214. [PMID: 30678156 PMCID: PMC6412808 DOI: 10.3390/nu11020214] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 01/07/2019] [Accepted: 01/10/2019] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Pycnogenol® (PYC), an extract of French maritime pine bark, is widely used as a dietary supplement. PYC has been shown to exert anti-inflammatory actions via inhibiting the Toll-like receptor 4 (TLR4) pathway. However, the role of the other receptors from the TLR family in the immunomodulatory activity of PYC has not been described so far. AIM The aim of this study was to investigate whether PYC might exert its immunomodulatory properties through cell membrane TLRs (TLR1/2, TLR5, and TLR2/6) other than TLR4. Moreover, the effect of gastrointestinal metabolism on the immunomodulatory effects of PYC was investigated. FINDINGS We showed that intact non-metabolized PYC dose-dependently acts as an agonist of TLR1/2 and TLR2/6 and as a partial agonist of TLR5. PYC on its own does not agonize or antagonize TLR4. However, after the formation of complexes with lipopolysaccharides (LPS), it is a potent activator of TLR4 signaling. Gastrointestinal metabolism of PYC revealed the immunosuppressive potential of the retentate fraction against TLR1/2 and TLR2/6 when compared to the control fraction containing microbiota and enzymes only. The dialyzed fraction containing PYC metabolites revealed the capacity to induce anti-inflammatory IL-10 secretion. Finally, microbially metabolized PYC affected the colonic microbiota composition during in vitro gastrointestinal digestion. CONCLUSIONS This study showed that gastrointestinal metabolism of PYC reveals its biological activity as a potential inhibitor of TLRs signaling. The results suggest that metabolized PYC acts as a partial agonist of TLR1/2 and TLR2/6 in the presence of the microbiota-derived TLR agonists (retentate fraction) and that it possesses anti-inflammatory potential reflected by the induction of IL-10 from THP-1 macrophages (dialysate fraction).
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Affiliation(s)
- Annelies Verlaet
- Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Food Science, University of Antwerp, 2610 Wilrijk, Belgium.
| | - Nieke van der Bolt
- Department of Cell Biology and Immunology, Wageningen University & Research, 6708 WD Wageningen, The Netherlands.
| | - Ben Meijer
- Department of Cell Biology and Immunology, Wageningen University & Research, 6708 WD Wageningen, The Netherlands.
| | - Annelies Breynaert
- Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Food Science, University of Antwerp, 2610 Wilrijk, Belgium.
| | - Tania Naessens
- Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Food Science, University of Antwerp, 2610 Wilrijk, Belgium.
| | - Prokopis Konstanti
- Laboratory of Microbiology, Wageningen University& Research, 6708 WE Wageningen, The Netherlands.
| | - Hauke Smidt
- Laboratory of Microbiology, Wageningen University& Research, 6708 WE Wageningen, The Netherlands.
| | - Nina Hermans
- Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Food Science, University of Antwerp, 2610 Wilrijk, Belgium.
| | - Huub F J Savelkoul
- Department of Cell Biology and Immunology, Wageningen University & Research, 6708 WD Wageningen, The Netherlands.
| | - Malgorzata Teodorowicz
- Department of Cell Biology and Immunology, Wageningen University & Research, 6708 WD Wageningen, The Netherlands.
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Yuste S, Macià A, Ludwig IA, Romero MP, Fernández-Castillejo S, Catalán Ú, Motilva MJ, Rubió L. Validation of Dried Blood Spot Cards to Determine Apple Phenolic Metabolites in Human Blood and Plasma After an Acute Intake of Red-Fleshed Apple Snack. Mol Nutr Food Res 2018; 62:e1800623. [PMID: 30328671 DOI: 10.1002/mnfr.201800623] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 08/23/2018] [Indexed: 01/03/2023]
Abstract
SCOPE The application of dried blood spot (DBS) cards for the study in human blood of dietary polyphenol bioavailability has been poorly studied. METHODS AND RESULTS An analytical method based on blood sampling with DBS cards combined with LC-MS/MS has been developed and validated. To test the method validation, the phenolic metabolites are determined in human blood and plasma obtained after an acute intake of a red-fleshed apple snack in ten volunteers. Capillary blood by finger prick is compared to venous blood by venipuncture and whole blood is also compared to their corresponding venous plasma samples. Moreover, the venous plasma results using DBS cards are compared to those obtained by microElution solid phase extraction (µSPE). The main phenolic metabolites detected in blood and plasma samples are phloretin glucuronide, dihydroxyphenylpropionic acid sulphate, (methyl) catechol sulphate, catechol glucuronide, and hydroxyphenyl-γ-valerolactone glucuronide. No significant differences are observed between capillary blood, venous blood, and plasma samples using DBS, and neither between plasma samples analyzed by DBS or µSPE. CONCLUSIONS Finger-prick blood sampling based on DBS appears to be a suitable alternative to the classic invasive venipuncture for the determination of circulating phenolic metabolites in nutritional postprandial studies.
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Affiliation(s)
- Silvia Yuste
- Food Technology Department, Agrotecnio Research Center, University of Lleida, Av/ Alcalde Rovira Roure 191, 25198, Lleida, Spain
| | - Alba Macià
- Food Technology Department, Agrotecnio Research Center, University of Lleida, Av/ Alcalde Rovira Roure 191, 25198, Lleida, Spain
| | - Iziar A Ludwig
- Food Technology Department, Agrotecnio Research Center, University of Lleida, Av/ Alcalde Rovira Roure 191, 25198, Lleida, Spain
| | - María-Paz Romero
- Food Technology Department, Agrotecnio Research Center, University of Lleida, Av/ Alcalde Rovira Roure 191, 25198, Lleida, Spain
| | - Sara Fernández-Castillejo
- Universitat Rovira i Virgili, Facultat de Medicina i Ciències de la Salut, Functional Nutrition, Oxidation, and Cardiovascular Diseases Group (NFOC-Salut), Reus, Spain
| | - Úrsula Catalán
- Universitat Rovira i Virgili, Facultat de Medicina i Ciències de la Salut, Functional Nutrition, Oxidation, and Cardiovascular Diseases Group (NFOC-Salut), Reus, Spain.,Institut d'Investigació Sanitaria Pere Virgili (IISPV), Reus, Spain
| | - María-José Motilva
- Food Technology Department, Agrotecnio Research Center, University of Lleida, Av/ Alcalde Rovira Roure 191, 25198, Lleida, Spain
| | - Laura Rubió
- Food Technology Department, Agrotecnio Research Center, University of Lleida, Av/ Alcalde Rovira Roure 191, 25198, Lleida, Spain
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Borges G, Ottaviani JI, van der Hooft JJ, Schroeter H, Crozier A. Absorption, metabolism, distribution and excretion of (−)-epicatechin: A review of recent findings. Mol Aspects Med 2018; 61:18-30. [DOI: 10.1016/j.mam.2017.11.002] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 10/30/2017] [Accepted: 11/02/2017] [Indexed: 01/16/2023]
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Wang YZ, Xu Q, Wu W, Liu Y, Jiang Y, Cai QQ, Lv QZ, Li XY. Brain Transport Profiles of Ginsenoside Rb 1 by Glucose Transporter 1: In Vitro and in Vivo. Front Pharmacol 2018; 9:398. [PMID: 29725302 PMCID: PMC5917093 DOI: 10.3389/fphar.2018.00398] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 04/06/2018] [Indexed: 01/07/2023] Open
Abstract
Ginsenoside Rb1 (Rb1) has been demonstrated its protection for central nervous system and is apparently highly distributed to the brain. The objective of this study was to characterize Rb1 transport at the blood–brain barrier (BBB) using primary cultured rat brain microvascular endothelial cells (rBMEC), an in vitro BBB model. The initial uptake velocity of Rb1 in rBMEC was temperature- and concentration-dependent, and was significantly reduced by phloretin, an inhibitor of GLUT1 transporter, but was independent of metabolic inhibitor. Furthermore, the transport of Rb1 into rBMEC was significantly diminished in the presence of natural substrate α-D-glucose, suggesting a facilitated transport of Rb1 via GLUT1 transporter. The impact of GLUT1 on the distribution of Rb1 between brain and plasma was studied experimentally in rats. Administration of phloretin (5 mg/kg, i.v.) to normal rats for consecutive 1 week before Rb1 (10 mg/kg, i.v.) at 0.5, 2, and 6 h did not alter Rb1 concentrations in plasma, but resulted in significant decreased brain concentrations of Rb1 compared to in the phloretin-untreated normal rats (489.6 ± 58.3 versus 105.1 ± 15.1 ng/g, 193.8 ± 11.1 versus 84.8 ± 4.1 ng/g, and 114.2 ± 24.0 versus 39.9 ± 4.9 ng/g, respectively). The expression of GLUT1 in the phloretin-treated group by western blotting analysis in vitro and in vivo experiments was significantly decreased, indicating that the decreased transport of Rb1 in brain was well related to the down-regulated function and level of GLUT1. Therefore, our in vitro and in vivo results indicate that the transport of Rb1 at the BBB is at least partly mediated by GLUT1 transporter.
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Affiliation(s)
- Yu-Zhu Wang
- Department of Pharmacy, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Qing Xu
- Department of Pharmacy, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Wei Wu
- Department of Pharmacy, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Ying Liu
- Department of Pharmacy, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Ying Jiang
- Department of Pharmacy, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Qing-Qing Cai
- Department of Pharmacy, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Qian-Zhou Lv
- Department of Pharmacy, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Xiao-Yu Li
- Department of Pharmacy, Zhongshan Hospital, Fudan University, Shanghai, China
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Verlaet AAJ, Maasakkers CM, Hermans N, Savelkoul HFJ. Rationale for Dietary Antioxidant Treatment of ADHD. Nutrients 2018; 10:nu10040405. [PMID: 29587355 PMCID: PMC5946190 DOI: 10.3390/nu10040405] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 03/12/2018] [Accepted: 03/21/2018] [Indexed: 12/27/2022] Open
Abstract
Increasing understanding arises regarding disadvantages of stimulant medication in children with ADHD (Attention-Deficit Hyperactivity Disorder). This review presents scientific findings supporting dietary antioxidant treatment of ADHD and describes substantial alterations in the immune system, epigenetic regulation of gene expression, and oxidative stress regulation in ADHD. As a result, chronic inflammation and oxidative stress could develop, which can lead to ADHD symptoms, for example by chronic T-cell-mediated neuroinflammation, as well as by neuronal oxidative damage and loss of normal cerebral functions. Therefore, modulation of immune system activity and oxidant-antioxidant balance using nutritional approaches might have potential in ADHD treatment. The use of natural antioxidants against oxidative conditions is an emerging field in the management of neurodegenerative diseases. Dietary polyphenols, for example, have antioxidant capacities as well as immunoregulatory effects and, therefore, appear appropriate in ADHD therapy. This review can stimulate the development and investigation of dietary antioxidant treatment in ADHD, which is highly desired.
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Affiliation(s)
- Annelies A J Verlaet
- Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Food Science, University of Antwerp, Universiteitsplein 1 (A104), 2610 Wilrijk, Belgium.
| | - Carlijn M Maasakkers
- Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Food Science, University of Antwerp, Universiteitsplein 1 (A104), 2610 Wilrijk, Belgium.
- Department of Geriatric Medicine, Radboud Institute for Health Sciences, Radboud University Medical Center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands.
- Cell Biology and Immunology Group, Wageningen University, De Elst 1 Building 122, 6709 PG Wageningen, The Netherlands.
| | - Nina Hermans
- Department of Pharmaceutical Sciences, Laboratory of Nutrition and Functional Food Science, University of Antwerp, Universiteitsplein 1 (A104), 2610 Wilrijk, Belgium.
| | - Huub F J Savelkoul
- Cell Biology and Immunology Group, Wageningen University, De Elst 1 Building 122, 6709 PG Wageningen, The Netherlands.
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13
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Rohdewald PJ. Review on Sustained Relief of Osteoarthritis Symptoms with a Proprietary Extract from Pine Bark, Pycnogenol. J Med Food 2018; 21:1-4. [PMID: 28836883 PMCID: PMC5775113 DOI: 10.1089/jmf.2017.0015] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 07/20/2017] [Indexed: 12/25/2022] Open
Abstract
This review summarizes the effects of the standardized proprietary bark extract of the French maritime pine (Pycnogenol®) in mild osteoarthritis (OA), stage 1 and 2. The extract exerts antioxidative, anti-inflammatory, and chondroprotective effects in vitro and in vivo. Its phenolic acids as well as catechin and taxifolin are quickly absorbed. Active metabolites, produced by gut microbiota in the intestinal tract from oligomeric procyanidins, appear in blood 6 h following ingestion and remain for at least 14 h, providing a long-lasting flow of anti-inflammatory substances for relief of OA symptoms. These constituents of Pycnogenol could be detected in serum, blood cells, and synovial fluid of OA patients. The resulting inhibition of cartilage-destructing proteases and pain-producing cyclo-oxygenases provides the basis for relief from pain, improvement of stiffness, enhanced mobility, and well-being in three clinical studies with the pine bark extract as an adjunct supplement. Sparing the use of nonsteroidal anti-inflammatory drugs, supplementation with the pine bark extract reduced gastric complications and hospital admissions of OA patients. Because of its favorable safety profile and sustained anti-inflammatory action, Pycnogenol represents an option as an add-on supplement for OA patients.
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Affiliation(s)
- Peter Jörg Rohdewald
- Institute for Pharmaceutical and Medicinal Chemistry, Westfälische Wilhelms-Universität , Münster, Germany
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Mülek M, Seefried L, Genest F, Högger P. Distribution of Constituents and Metabolites of Maritime Pine Bark Extract (Pycnogenol ®) into Serum, Blood Cells, and Synovial Fluid of Patients with Severe Osteoarthritis: A Randomized Controlled Trial. Nutrients 2017; 9:E443. [PMID: 28452960 PMCID: PMC5452173 DOI: 10.3390/nu9050443] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 04/24/2017] [Accepted: 04/26/2017] [Indexed: 12/23/2022] Open
Abstract
The present randomized controlled study aimed to investigate the in vivo distribution of constituents or metabolites of the standardized maritime pine bark extract Pycnogenol®. Thirty-three patients with severe osteoarthritis scheduled for a knee arthroplasty were randomized to receive either 200 mg per day Pycnogenol® (P+) or no treatment (Co) over three weeks before surgery. Serum, blood cells, and synovial fluid samples were analyzed using liquid chromatography coupled to tandem mass spectrometry with electrospray ionization (LC-ESI/MS/MS). Considerable interindividual differences were observed indicating pronounced variability of the polyphenol pharmacokinetics. Notably, the highest polyphenol concentrations were not detected in serum. Catechin and taxifolin primarily resided within the blood cells while the microbial catechin metabolite δ-(3,4-dihydroxy-phenyl)-γ-valerolactone, ferulic, and caffeic acid were mainly present in synovial fluid samples. Taxifolin was detected in serum and synovial fluid exclusively in the P+ group. Likewise, no ferulic acid was found in serum samples of the Co group. Calculating ratios of analyte distribution in individual patients revealed a simultaneous presence of some polyphenols in serum, blood cells, and/or synovial fluid only in the P+ group. This is the first evidence that polyphenols distribute into the synovial fluid of patients with osteoarthritis which supports rationalizing the results of clinical efficacy studies.
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Affiliation(s)
- Melanie Mülek
- Institut für Pharmazie und Lebensmittelchemie, Universität Würzburg, 97074 Würzburg, Germany.
| | - Lothar Seefried
- Department of Orthopedics, Orthopedic Center for Musculoskeletal Research, 97074 Würzburg, Germany.
| | - Franca Genest
- Department of Orthopedics, Orthopedic Center for Musculoskeletal Research, 97074 Würzburg, Germany.
| | - Petra Högger
- Institut für Pharmazie und Lebensmittelchemie, Universität Würzburg, 97074 Würzburg, Germany.
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15
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Ottaviani JI, Borges G, Momma TY, Spencer JPE, Keen CL, Crozier A, Schroeter H. The metabolome of [2-(14)C](-)-epicatechin in humans: implications for the assessment of efficacy, safety, and mechanisms of action of polyphenolic bioactives. Sci Rep 2016; 6:29034. [PMID: 27363516 PMCID: PMC4929566 DOI: 10.1038/srep29034] [Citation(s) in RCA: 187] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 06/14/2016] [Indexed: 02/01/2023] Open
Abstract
Diet is a major life style factor affecting human health, thus emphasizing the need for evidence-based dietary guidelines for primary disease prevention. While current recommendations promote intake of fruit and vegetables, we have limited understanding of plant-derived bioactive food constituents other than those representing the small number of essential nutrients and minerals. This limited understanding can be attributed to some extent to a lack of fundamental data describing the absorption, distribution, metabolism and excretion (ADME) of bioactive compounds. Consequently, we selected the flavanol (−)-epicatechin (EC) as an example of a widely studied bioactive food constituent and investigated the ADME of [2-14C](−)-epicatechin (300 μCi, 60 mg) in humans (n = 8). We demonstrated that 82 ± 5% of ingested EC was absorbed. We also established pharmacokinetic profiles and identified and quantified >20 different metabolites. The gut microbiome proved to be a key driver of EC metabolism. Furthermore, we noted striking species-dependent differences in the metabolism of EC, an insight with significant consequences for investigating the mechanisms of action underlying the beneficial effects of EC. These differences need to be considered when assessing the safety of EC intake in humans. We also identified a potential biomarker for the objective assessment of EC intake that could help to strengthen epidemiological investigations.
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Affiliation(s)
| | - Gina Borges
- Department of Nutrition, University of California Davis, Davis, CA 95616, USA
| | - Tony Y Momma
- Department of Nutrition, University of California Davis, Davis, CA 95616, USA
| | - Jeremy P E Spencer
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, Reading RG6 6AP, UK
| | - Carl L Keen
- Department of Nutrition, University of California Davis, Davis, CA 95616, USA
| | - Alan Crozier
- Department of Nutrition, University of California Davis, Davis, CA 95616, USA
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Tedesco I, Moccia S, Volpe S, Alfieri G, Strollo D, Bilotto S, Spagnuolo C, Di Renzo M, Aquino RP, Russo GL. Red wine activates plasma membrane redox system in human erythrocytes. Free Radic Res 2016; 50:557-69. [PMID: 26866566 DOI: 10.3109/10715762.2016.1152629] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
In the present study, we report that polyphenols present in red wine obtained by a controlled microvinification process are able to protect human erythrocytes from oxidative stress and to activate Plasma Membrane Redox System (PMRS). Human plasma obtained from healthy subjects was incubated in the presence of whole red wine at a concentration corresponding to 9.13-73 μg/ml gallic acid equivalents to verify the capacity to protect against hypochlorous acid (HOCl)-induced plasma oxidation and to minimize chloramine formation. Red wine reduced hemolysis and chloramine formation induced by HOCl of 40 and 35%, respectively. PMRS present on human erythrocytes transfers electrons from intracellular molecules to extracellular electron acceptors. We demonstrated that whole red wine activated PMRS activity in human erythrocytes isolated from donors in a dose-dependent manner with a maximum at about 70-100 μg/ml gallic acid equivalents. We also showed that red wine increased glutathione (GSH) levels and erythrocytic antioxidant capacity, measured by 2,2-diphenyl-1-picrylhydrazyl (DPPH) quenching assay. Furthermore, we reported that GSH played a crucial role in regulating PMRS activity in erythrocytes. In fact, the effect of iodoacetamide, an alkylating agent that induces depletion of intracellular GSH, was completely counteracted by red wine. Bioactive compounds present in red wine, such as gallic acid, resveratrol, catechin, and quercetin were unable to activate PMRS when tested at the concentrations normally present in aged red wines. On the contrary, the increase of PMRS activity was associated with the anthocyanin fraction, suggesting the capacity of this class of compounds to positively modulate PMRS enzymatic activity.
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Affiliation(s)
- Idolo Tedesco
- a Institute of Food Sciences, National Research Council , Avellino , Italy
| | - Stefania Moccia
- a Institute of Food Sciences, National Research Council , Avellino , Italy
| | - Silvestro Volpe
- b Division of Onco-Hematology , S.G. Moscati Hospital , Avellino , Italy
| | - Giovanna Alfieri
- b Division of Onco-Hematology , S.G. Moscati Hospital , Avellino , Italy
| | | | - Stefania Bilotto
- a Institute of Food Sciences, National Research Council , Avellino , Italy
| | - Carmela Spagnuolo
- a Institute of Food Sciences, National Research Council , Avellino , Italy
| | | | - Rita P Aquino
- d Department of Pharmacy , University of Salerno , Fisciano (SA) , Italy
| | - Gian Luigi Russo
- a Institute of Food Sciences, National Research Council , Avellino , Italy
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17
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Psychiatric Disorders and Polyphenols: Can They Be Helpful in Therapy? OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:248529. [PMID: 26180581 PMCID: PMC4477218 DOI: 10.1155/2015/248529] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 02/06/2015] [Accepted: 02/10/2015] [Indexed: 12/24/2022]
Abstract
The prevalence of psychiatric disorders permanently increases. Polyphenolic compounds can be involved in modulation of mental health including brain plasticity, behaviour, mood, depression, and cognition. In addition to their antioxidant ability other biomodulating properties have been observed. In the pathogenesis of depression disturbance in neurotransmitters, increased inflammatory processes, defects in neurogenesis and synaptic plasticity, mitochondrial dysfunction, and redox imbalance are observed. Ginkgo biloba, green tea, and Quercus robur extracts and curcumin can affect neuronal system in depressive patients. ADHD patients treated with antipsychotic drugs, especially stimulants, report significant adverse effects; therefore, an alternative treatment is searched for. An extract from Ginkgo biloba and from Pinus pinaster bark, Pycnogenol, could become promising complementary supplements in ADHD treatment. Schizophrenia is a devastating mental disorder, with oxidative stress involved in its pathophysiology. The direct interference of polyphenols with schizophrenia pathophysiology has not been reported yet. However, increased oxidative stress caused by haloperidol was inhibited ex vivo by different polyphenols. Curcumin, extract from green tea and from Ginkgo biloba, may have benefits on serious side effects associated with administration of neuroleptics to patients suffering from schizophrenia. Polyphenols in the diet have the potential to become medicaments in the field of mental health after a thorough study of their mechanism of action.
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Sompong W, Cheng H, Adisakwattana S. Protective Effects of Ferulic Acid on High Glucose-Induced Protein Glycation, Lipid Peroxidation, and Membrane Ion Pump Activity in Human Erythrocytes. PLoS One 2015; 10:e0129495. [PMID: 26053739 PMCID: PMC4460125 DOI: 10.1371/journal.pone.0129495] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 05/08/2015] [Indexed: 11/29/2022] Open
Abstract
Ferulic acid (FA) is the ubiquitous phytochemical phenolic derivative of cinnamic acid. Experimental studies in diabetic models demonstrate that FA possesses multiple mechanisms of action associated with anti-hyperglycemic activity. The mechanism by which FA prevents diabetes-associated vascular damages remains unknown. The aim of study was to investigate the protective effects of FA on protein glycation, lipid peroxidation, membrane ion pump activity, and phosphatidylserine exposure in high glucose-exposed human erythrocytes. Our results demonstrated that FA (10-100 μM) significantly reduced the levels of glycated hemoglobin (HbA1c) whereas 0.1-100 μM concentrations inhibited lipid peroxidation in erythrocytes exposed to 45 mM glucose. This was associated with increased glucose consumption. High glucose treatment also caused a significant reduction in Na+/K+-ATPase activity in the erythrocyte plasma membrane which could be reversed by FA. Furthermore, we found that FA (0.1-100 μM) prevented high glucose-induced phosphatidylserine exposure. These findings provide insights into a novel mechanism of FA for the prevention of vascular dysfunction associated with diabetes.
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Affiliation(s)
- Weerachat Sompong
- Program in Clinical Biochemistry and Molecular Medicine, Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, Thailand
- Research Group of Herbal Medicine for Prevention and Therapeutic of Metabolic Diseases, Chulalongkorn University, Bangkok, Thailand
| | - Henrique Cheng
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana, United States of America
| | - Sirichai Adisakwattana
- Research Group of Herbal Medicine for Prevention and Therapeutic of Metabolic Diseases, Chulalongkorn University, Bangkok, Thailand
- Department of Nutrition and Dietetics, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, Thailand
- * E-mail:
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Mülek M, Fekete A, Wiest J, Holzgrabe U, Mueller MJ, Högger P. Profiling a gut microbiota-generated catechin metabolite's fate in human blood cells using a metabolomic approach. J Pharm Biomed Anal 2015; 114:71-81. [PMID: 26025814 DOI: 10.1016/j.jpba.2015.04.042] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Revised: 04/27/2015] [Accepted: 04/30/2015] [Indexed: 11/18/2022]
Abstract
The microbial catechin metabolite δ-(3,4-dihydroxy-phenyl)-γ-valerolactone (M1) has been found in human plasma samples after intake of maritime pine bark extract (Pycnogenol). M1 has been previously shown to accumulate in endothelial and blood cells in vitro after facilitated uptake and to exhibit anti-inflammatory activity. The purpose of the present research approach was to systematically and comprehensively analyze the metabolism of M1 in human blood cells in vitro and in vivo. A metabolomic approach that had been successfully applied for drug metabolite profiling was chosen to detect 19 metabolite peaks of M1 which were subsequently further analyzed and validated. The metabolites were categorized into three levels of identification according to the Metabolomics Standards Initiative with six compounds each confirmed at levels 1 and 2 and seven putative metabolites at level 3. The predominant metabolites were glutathione conjugates which were rapidly formed and revealed prolonged presence within the cells. Although a formation of an intracellular conjugate of M1 and glutathione (M1-GSH) was already known two GSH conjugate isomers, M1-S-GSH and M1-N-GSH were observed in the current study. Additionally detected organosulfur metabolites were conjugates with oxidized glutathione and cysteine. Other biotransformation products constituted the open-chained ester form of M1 and a methylated M1. Six of the metabolites determined in in vitro assays were also detected in blood cells in vivo after ingestion of the pine bark extract by two volunteers. The present study provides the first evidence that multiple and structurally heterogeneous polyphenol metabolites can be generated in human blood cells. The bioactivity of the M1 metabolites and their contribution to the previously determined anti-inflammatory effects of M1 now need to be elucidated.
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Affiliation(s)
- Melanie Mülek
- Universität Würzburg, Institut für Pharmazie und Lebensmittelchemie, Würzburg, Germany
| | - Agnes Fekete
- Universität Würzburg, Julius-von-Sachs-Institut für Biowissenschaften, Würzburg, Germany
| | - Johannes Wiest
- Universität Würzburg, Institut für Pharmazie und Lebensmittelchemie, Würzburg, Germany
| | - Ulrike Holzgrabe
- Universität Würzburg, Institut für Pharmazie und Lebensmittelchemie, Würzburg, Germany
| | - Martin J Mueller
- Universität Würzburg, Julius-von-Sachs-Institut für Biowissenschaften, Würzburg, Germany
| | - Petra Högger
- Universität Würzburg, Institut für Pharmazie und Lebensmittelchemie, Würzburg, Germany.
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Hevia D, González-Menéndez P, Quiros-González I, Miar A, Rodríguez-García A, Tan DX, Reiter RJ, Mayo JC, Sainz RM. Melatonin uptake through glucose transporters: a new target for melatonin inhibition of cancer. J Pineal Res 2015; 58:234-50. [PMID: 25612238 DOI: 10.1111/jpi.12210] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 01/15/2015] [Indexed: 12/17/2022]
Abstract
Melatonin is present in a multitude of taxa and it has a broad range of biological functions, from synchronizing circadian rhythms to detoxifying free radicals. Some functions of melatonin are mediated by its membrane receptors but others are receptor-independent. For the latter, melatonin must enter into the cell. Melatonin is a derivative of the amino acid tryptophan and reportedly easily crosses biological membranes due to its amphipathic nature. However, the mechanism by which melatonin enters into cells remains unknown. Changes in redox state, endocytosis pathways, multidrug resistance, glycoproteins or a variety of strategies have no effect on melatonin uptake. Herein, it is demonstrated that members of the SLC2/GLUT family glucose transporters have a central role in melatonin uptake. When studied by docking simulation, it is found that melatonin interacts at the same location in GLUT1 where glucose does. Furthermore, glucose concentration and the presence of competitive ligands of GLUT1 affect the concentration of melatonin into cells. As a regulatory mechanism, melatonin reduces the uptake of glucose and modifies the expression of GLUT1 transporter in prostate cancer cells. More importantly, glucose supplementation promotes prostate cancer progression in TRAMP mice, while melatonin attenuated glucose-induced tumor progression and prolonged the lifespan of tumor-bearing mice. This is the first time that a facilitated transport of melatonin is suggested. In fact, the important role of glucose transporters and glucose metabolism in cell fate might explain some of the diverse functions described for melatonin.
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Affiliation(s)
- David Hevia
- Departamento de Morfología y Biología Celular, Instituto Universitario Oncológico del Principado de Asturias (IUOPA), Universidad de Oviedo, Oviedo, Spain
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Xiao J, Högger P. Stability of Dietary Polyphenols under the Cell Culture Conditions: Avoiding Erroneous Conclusions. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:1547-57. [PMID: 25608051 DOI: 10.1021/jf505514d] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jianbo Xiao
- Universität
Würzburg, Institut für Pharmazie und Lebensmittelchemie, Am Hubland, 97074 Würzburg, Germany
- State
Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Taipa, Macau, China
- Department
of Nutrition and Food Hygiene, School of Public Health, Fudan University, 138 Yi Xue Yuan Road, Shanghai 200032, China
| | - Petra Högger
- Universität
Würzburg, Institut für Pharmazie und Lebensmittelchemie, Am Hubland, 97074 Würzburg, Germany
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Mülek M, Högger P. Highly sensitive analysis of polyphenols and their metabolites in human blood cells using dispersive SPE extraction and LC-MS/MS. Anal Bioanal Chem 2015; 407:1885-99. [PMID: 25579463 DOI: 10.1007/s00216-014-8451-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 12/23/2014] [Accepted: 12/23/2014] [Indexed: 10/24/2022]
Abstract
Blood cells, particularly erythrocytes, present a significant compartment for distribution of drugs and endogenous compounds and have been suggested to be factored in pharmacokinetic and pharmacodynamic evaluations. We previously detected the binding of polyphenols to red blood cells and found indications for a facilitated uptake of the bioactive procyanidin metabolite δ-(3,4-dihydroxy-phenyl)-γ-valerolactone (M1) into human erythrocytes. The purpose of the present investigation was to develop an effective, sensitive and robust liquid chromatography tandem mass spectrometry (LC-MS/MS) method to quantify low concentrations of polyphenols in human blood cells. Various sample preparation methods including classic sample clean-up techniques and variations of the QuEChERS (quick, easy, cheap, effective, rugged and safe) approach were compared regarding compound recovery, matrix effects and overall process efficiency. The QuEChERS technique which involves a liquid-liquid extraction and clean-up by dispersive solid-phase extraction yielded best results. The method was fully validated for the six analytes: (+)-catechin, ferulic acid, M1, taxifolin, caffeic acid and δ-3-methoxy-4-hydroxy-phenyl- γ-valerolactone (M2) in human blood cells with an optimised QuEChERS sample preparation and prior enzymatic hydrolysis of analyte conjugates. The lower limits of quantification for the analytes ranged from 0.12 ng/mL for M1, M2 and taxifolin to 48.40 ng/mL for caffeic acid. The application of the method to a blood cell sample of a volunteer ingesting 100 mg/day of the standardised pine bark extract Pycnogenol(®) over the course of 3 weeks revealed measurable steady-state concentrations of catechin, M1, taxifolin, ferulic acid and M2. To our knowledge, this is the first report of using the QuEChERS approach for detection and quantification of plant-derived compounds in human blood cells. The method can be applied in pharmacokinetic studies to determine the distribution of polyphenols and their metabolites in human whole blood, blood cells or erythrocytes. This might contribute in gaining deeper insights into the in vivo distribution of polyphenols and their metabolites.
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Affiliation(s)
- Melanie Mülek
- Institut für Pharmazie und Lebensmittelchemie, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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