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Richter-Laskowska M, Trybek P, Delfino DV, Wawrzkiewicz-Jałowiecka A. Flavonoids as Modulators of Potassium Channels. Int J Mol Sci 2023; 24:1311. [PMID: 36674825 PMCID: PMC9861088 DOI: 10.3390/ijms24021311] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/02/2023] [Accepted: 01/04/2023] [Indexed: 01/12/2023] Open
Abstract
Potassium channels are widely distributed integral proteins responsible for the effective and selective transport of K+ ions through the biological membranes. According to the existing structural and mechanistic differences, they are divided into several groups. All of them are considered important molecular drug targets due to their physiological roles, including the regulation of membrane potential or cell signaling. One of the recent trends in molecular pharmacology is the evaluation of the therapeutic potential of natural compounds and their derivatives, which can exhibit high specificity and effectiveness. Among the pharmaceuticals of plant origin, which are potassium channel modulators, flavonoids appear as a powerful group of biologically active substances. It is caused by their well-documented anti-oxidative, anti-inflammatory, anti-mutagenic, anti-carcinogenic, and antidiabetic effects on human health. Here, we focus on presenting the current state of knowledge about the possibilities of modulation of particular types of potassium channels by different flavonoids. Additionally, the biological meaning of the flavonoid-mediated changes in the activity of K+ channels will be outlined. Finally, novel promising directions for further research in this area will be proposed.
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Affiliation(s)
- Monika Richter-Laskowska
- The Centre for Biomedical Engineering, Łukasiewicz Research Network—Krakow Institute of Technology, 30-418 Krakow, Poland
| | - Paulina Trybek
- Faculty of Science and Technology, University of Silesia in Katowice, 41-500 Chorzów, Poland
| | | | - Agata Wawrzkiewicz-Jałowiecka
- Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 44-100 Gliwice, Poland
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Chda A, Bencheikh R. Flavonoids as G Protein-coupled Receptors Ligands: New Potential Therapeutic Natural Drugs. Curr Drug Targets 2023; 24:1346-1363. [PMID: 38037994 DOI: 10.2174/0113894501268871231127105219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 10/18/2023] [Accepted: 10/25/2023] [Indexed: 12/02/2023]
Abstract
G protein coupled receptors (GPCRs) are among the largest family of cell surface receptors found in the human genome. They govern a wide range of physiological responses in both health and diseases, making them one of the potential targeted surface receptors for pharmaceuticals. Flavonoids can modulate GPCRs activity by acting as allosteric ligands. They can either enhance or reduce the GPCR's effect. Emerging research shows that individual flavonoids or mixtures of flavonoids from plant extracts can have relevant pharmacological effects against a number of diseases, particularly by influencing GPCRs. In the present review, we are considering to give a comprehensive overview of flavonoids and related compounds that exhibit GPCRs activity and to further explore which beneficial structural features. Molecular docking was used to strengthen experimental evidence and describe flavonoid-GPCRs interactions at molecular level.
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Affiliation(s)
- Alae Chda
- Laboratory of Microbial Biotechnology and Bioactive Molecules (LM2BM), Faculty of Science and Technology, Sidi Mohamed Ben Abdellah University, Road of Immouzer, PO Box 2202, Fez, Morocco
- Higher Institute of Nursing and Health Techniques - Fez. Ministry of Health and Social Protection, Fez, Morocco
| | - Rachid Bencheikh
- Laboratory of Microbial Biotechnology and Bioactive Molecules (LM2BM), Faculty of Science and Technology, Sidi Mohamed Ben Abdellah University, Road of Immouzer, PO Box 2202, Fez, Morocco
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Kampa RP, Sęk A, Szewczyk A, Bednarczyk P. Cytoprotective effects of the flavonoid quercetin by activating mitochondrial BK Ca channels in endothelial cells. Biomed Pharmacother 2021; 142:112039. [PMID: 34392086 DOI: 10.1016/j.biopha.2021.112039] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 08/02/2021] [Accepted: 08/07/2021] [Indexed: 02/06/2023] Open
Abstract
Mitochondrial potassium channels have been implicated in cytoprotective mechanisms. Activation of the mitochondrial large-conductance Ca2+-regulated potassium (mitoBKCa) channel is important for protecting brain tissue against stroke damage as well as heart tissue against ischemia damage. In this paper, we examine the effect of the natural flavonoid quercetin as an activator of the mitoBKCa channel. Quercetin has a beneficial effect on many processes in the human body and interacts with many receptors and signaling pathways. We found that quercetin acts on mitochondria as a mitoBKCa channel opener. The activation observed with the patch-clamp technique was potent and increased the channel open probability from approximately 0.35 to 0.95 at + 40 mV in the micromolar concentration range. Moreover, quercetin at a concentration of 10 µM protected cells by reducing damage from treatment factors (tumor necrosis factor α and cycloheximide) by 40%, enhancing cellular migration and depolarizing the mitochondrial membrane. Moreover, the presence of quercetin increased the gene expression and protein level of the mitoBKCa β3 regulatory subunit. The observed cytoprotective effects suggested the involvement of BKCa channel activation. Additionally, the newly discovered mitoBKCa activator quercetin elucidates a new mitochondrial pathway that is beneficial for vascular endothelial cells.
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Affiliation(s)
- Rafał Paweł Kampa
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology PAS, Warsaw, Poland; Department of Physics and Biophysics, Institute of Biology, Warsaw University of Life Sciences - SGGW, Warsaw, Poland
| | - Aleksandra Sęk
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology PAS, Warsaw, Poland; Faculty of Chemistry, University of Warsaw, Warsaw, Poland
| | - Adam Szewczyk
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology PAS, Warsaw, Poland
| | - Piotr Bednarczyk
- Department of Physics and Biophysics, Institute of Biology, Warsaw University of Life Sciences - SGGW, Warsaw, Poland.
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Mitochondrial Bioenergetics During Ischemia and Reperfusion. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 982:141-167. [PMID: 28551786 DOI: 10.1007/978-3-319-55330-6_8] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
During ischemia and reperfusion (I/R) mitochondria suffer a deficiency to supply the cardiomyocyte with chemical energy, but also contribute to the cytosolic ionic alterations especially of Ca2+. Their free calcium concentration ([Ca2+]m) mainly depends on mitochondrial entrance through the uniporter (UCam) and extrusion in exchange with Na+ (mNCX) driven by the electrochemical gradient (ΔΨm). Cardiac energetic is frequently estimated by the oxygen consumption, which determines metabolism coupled to ATP production and to the maintaining of ΔΨm. Nevertheless, a better estimation of heart energy consumption is the total heat release associated to ATP hydrolysis, metabolism, and binding reactions, which is measurable either in the presence or the absence of oxygenation or perfusion. Consequently, a mechano-calorimetrical approach on isolated hearts gives a tool to evaluate muscle economy. The mitochondrial role during I/R depends on the injury degree. We investigated the role of the mitochondrial Ca2+ transporters in the energetic of hearts stunned by a model of no-flow I/R in rat hearts. This chapter explores an integrated view of previous and new results which give evidences to the mitochondrial role in cardiac stunning by ischemia o hypoxia, and the influence of thyroid alterations and cardioprotective strategies, such as cardioplegic solutions (high K-low Ca, pyruvate) and the phytoestrogen genistein in both sex. Rat ventricles were perfused in a flow-calorimeter at either 30 °C or 37 °C to continuously measure the left ventricular pressure (LVP) and total heat rate (Ht). A pharmacological treatment was done before exposing to no-flow I and R. The post-ischemic contractile (PICR as %) and energetical (Ht) recovery and muscle economy (Eco: P/Ht) were determined during stunning. The functional interaction between mitochondria (Mit) and sarcoplasmic reticulum (SR) was evaluated with selective mitochondrial inhibitors in hearts reperfused with Krebs-10 mM caffeine-36 mM Na+. The caffeine induced contracture (CIC) was due to SR Ca2+ release, while relaxation mainly depends on mitochondrial Ca2+ uptake since neither SL-NCX nor SERCA are functional under this media. The ratio of area-under-curves over ischemic values (AUC-ΔHt/AUC-ΔLVP) estimates the energetical consumption (EC) to maintain CIC. Relaxation of CIC was accelerated by inhibition of mNCX or by adding the aerobic substrate pyruvate, while both increased EC. Contrarily, relaxation was slowed by cardioplegia (high K-low Ca Krebs) and by inhibition of UCam. Thus, Mit regulate the cytosolic [Ca2+] and SR Ca2+ content. Both, hyperthyroidism (HpT) and hypothyroidism (HypoT) reduced the peak of CIC but increased EC, in spite of improving PICR. Both, CIC and PICR in HpT were also sensitive to inhibition of mNCX or UCam, suggesting that Mit contribute to regulate the SR store and Ca2+ release. The interaction between mitochondria and SR and the energetic consequences were also analyzed for the effects of genistein in hearts exposed to I/R, and for the hypoxia/reoxygenation process. Our results give evidence about the mitochondrial regulation of both PICR and energetic consumption during stunning, through the Ca2+ movement.
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Ruamyod K, Watanapa WB, Shayakul C. Testosterone rapidly increases Ca 2+-activated K + currents causing hyperpolarization in human coronary artery endothelial cells. J Steroid Biochem Mol Biol 2017; 168:118-126. [PMID: 28223151 DOI: 10.1016/j.jsbmb.2017.02.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 02/14/2017] [Accepted: 02/17/2017] [Indexed: 12/20/2022]
Abstract
Testosterone has endothelium-dependent vasodilatory effects on the coronary artery, with some reports suggesting endothelial ion channel involvement. This study employed the whole-cell patch clamp technique to investigate the effect of testosterone on ion channels in human coronary artery endothelial cells (HCAECs) and the mechanisms involved. We found that 0.03-3μM testosterone significantly induced a rapid, concentration-dependent increase in total HCAEC current (EC50, 71.96±1.66nM; maximum increase, 59.13±8.37%; mean±SEM). The testosterone-enhanced currents consisted of small- and large-conductance Ca2+-activated K+ currents (SKCa and BKCa currents), but not Cl- and nonselective cation currents. Either a non-permeant testosterone conjugate or the non-aromatizable androgen dihydrotestosterone (DHT) could increase HCAEC currents as well. The androgen receptor antagonist flutamide prevented this testosterone, testosterone conjugate, and DHT effect, while the estrogen receptor antagonist fulvestrant did not. Incubating HCAECs with pertussis toxin or protein kinase A inhibitor H-89 largely inhibited the testosterone effect, while pre-incubation with phospholipase C inhibitor U-73122, prostacyclin inhibitor indomethacin, nitric oxide synthase inhibitor L-NAME or cytochrome P450 inhibitor MS-PPOH, did not. Finally, testosterone application induced HCAEC hyperpolarization within minutes; this effect was prevented by SKCa and BKCa current inhibitors apamin and iberiotoxin. This is the first electrophysiological demonstration of androgen-induced KCa current increase, leading to hyperpolarization, in any endothelial cell, and the first report of SKCa as a testosterone target. Our data show that testosterone rapidly increased whole-cell HCAEC SKCa and BKCa currents via a surface androgen receptor, Gi/o protein, and protein kinase A. This mechanism may explain rapid testosterone-induced coronary vasodilation seen in vivo.
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Affiliation(s)
- Katesirin Ruamyod
- Department of Physiology Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand.
| | - Wattana B Watanapa
- Department of Physiology Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand.
| | - Chairat Shayakul
- Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand.
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Rodrigues AMG, Guimarães DO, Konno TUP, Tinoco LW, Barth T, Aguiar FA, Lopes NP, Leal ICR, Raimundo JM, Muzitano MF. Phytochemical Study of Tapirira guianensis Leaves Guided by Vasodilatory and Antioxidant Activities. Molecules 2017; 22:molecules22020304. [PMID: 28218702 PMCID: PMC6155791 DOI: 10.3390/molecules22020304] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 01/31/2017] [Accepted: 02/01/2017] [Indexed: 01/28/2023] Open
Abstract
The aim of this research was to perform a phytochemical study of the methanol leaves extract of T. guianensis (MET) guided by vasodilatory and antioxidant activities. The chemical profile of MET and the ethyl acetate fraction (EA fraction) was determined by HPLC-UV-MS and EA fraction guided fractionation by reverse-phase chromatography. The vasorelaxant effects of MET, fractions, sub-fractions and constituents were assessed on rat aorta pre-contracted with phenylephrine. Antioxidant activity was evaluated by using a DPPH assay. The results show that MET-induced vasodilation was dependent on NO/cGMP; and that the PI3K/Akt pathway seems to be the main route involved in eNOS activation. The EA fraction showed greater vasodilatory and antioxidant potency and was submitted to further fractionation. This allowed the isolation and characterization of quercetin, quercetin 3-O-(6″-O-galloyl)-β-d-galactopyranoside and 1,4,6-tri-O-galloyl-β-d-glucose. Also, galloyl-HHDP-hexoside and myricetin deoxyhexoside were identified by HPLC-UV-MS. These compounds are being described for the first time for T. guianensis. 1,4,6-tri-O-galloyl-β-d-glucose and quercetin 3-O-(6″-O-galloyl)-β-d-galactopyranoside showed no vasodilatory activity. Quercetin and myricetin glycoside seems to contribute to the MET activity, since they have been reported as vasodilatory flavonoids. MET-induced vasodilation could contribute to the hypotensive effect of T. guianensis previously reported.
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Affiliation(s)
- Amélia M G Rodrigues
- Laboratório de Biologia do Reconhecer, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000, Parque Califórnia, Campos dos Goytacazes, 28013-602 Rio de Janeiro, Brazil.
- Laboratório Integrado de Pesquisa, Universidade Federal do Rio de Janeiro, Campus Macaé, Av. Aluízio da Silva Gomes, 50, Novo Cavaleiros, Macaé, 27930-560 Rio de Janeiro, Brazil.
- Laboratório de Produtos Bioativos, Universidade Federal do Rio de Janeiro, Campus Macaé, Polo Novo Cavaleiro-IMCT, R. Alcides da Conceição, 159, Novo Cavaleiros, Macaé, 27933-378 Rio de Janeiro, Brazil.
| | - Denise O Guimarães
- Laboratório de Produtos Bioativos, Universidade Federal do Rio de Janeiro, Campus Macaé, Polo Novo Cavaleiro-IMCT, R. Alcides da Conceição, 159, Novo Cavaleiros, Macaé, 27933-378 Rio de Janeiro, Brazil.
| | - Tatiana U P Konno
- Núcleo de Estudos em Ecologia e Desenvolvimento Sócio-Ambiental de Macaé, Universidade Federal do Rio de Janeiro, Av. São José Barreto, 764-São José do Barreto. Macaé, 27965-045 Rio de Janeiro, Brazil.
| | - Luzineide W Tinoco
- Instituto de Pesquisa de Produtos Naturais Walter Mors, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Brazil.
| | - Thiago Barth
- Laboratório de Produtos Bioativos, Universidade Federal do Rio de Janeiro, Campus Macaé, Polo Novo Cavaleiro-IMCT, R. Alcides da Conceição, 159, Novo Cavaleiros, Macaé, 27933-378 Rio de Janeiro, Brazil.
| | - Fernando A Aguiar
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café s/n. 14040-020 Ribeirão Preto, Brazil.
- Laboratório de Química, Universidade Federal do Rio de Janeiro-Campus Macaé, Av. Aluízio da Silva Gomes, 50, Novo Cavaleiros. Macaé, 27930-560 Rio de Janeiro, Brazil.
| | - Norberto P Lopes
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos, Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café s/n. 14040-020 Ribeirão Preto, Brazil.
| | - Ivana C R Leal
- Laboratório de Produtos Naturais e Ensaios Biológicos, Departamento De Produtos Naturais e Alimentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil.
| | - Juliana M Raimundo
- Laboratório Integrado de Pesquisa, Universidade Federal do Rio de Janeiro, Campus Macaé, Av. Aluízio da Silva Gomes, 50, Novo Cavaleiros, Macaé, 27930-560 Rio de Janeiro, Brazil.
| | - Michelle F Muzitano
- Laboratório de Produtos Bioativos, Universidade Federal do Rio de Janeiro, Campus Macaé, Polo Novo Cavaleiro-IMCT, R. Alcides da Conceição, 159, Novo Cavaleiros, Macaé, 27933-378 Rio de Janeiro, Brazil.
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Yorulmaz O O, Ertug PU, Karabulut E, Kumcu EK, Singirik E, Secilmis MA. Dose-dependent Differential Mechanism of Quercetin-induced
Vasodilatations in Isolated Perfused Rat Mesenteric Vascular Bed. INT J PHARMACOL 2016. [DOI: 10.3923/ijp.2016.379.386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Nishida S, Tshuchida K, Satoh H. [The vascular pharmacological effects induced by quercetin contained in Kampo herbal medicine]. Nihon Yakurigaku Zasshi 2016; 146:140-3. [PMID: 26354013 DOI: 10.1254/fpj.146.140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Boydens C, Pauwels B, Decaluwé K, Brouckaert P, Van de Voorde J. Relaxant and Antioxidant Capacity of the Red Wine Polyphenols, Resveratrol and Quercetin, on Isolated Mice Corpora Cavernosa. J Sex Med 2015; 12:303-12. [DOI: 10.1111/jsm.12786] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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10
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Takahashi A, Inoue H, Mishima K, Ide F, Nakayama R, Hasaka A, Ryo K, Ito Y, Sakurai T, Hasegawa Y, Saito I. Evaluation of the effects of quercetin on damaged salivary secretion. PLoS One 2015; 10:e0116008. [PMID: 25629520 PMCID: PMC4309588 DOI: 10.1371/journal.pone.0116008] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 12/03/2014] [Indexed: 12/17/2022] Open
Abstract
With the aim of discovering an effective method to treat dry mouth, we analyzed the effects of quercetin on salivary secretion and its mechanism of action. We created a mouse model with impaired salivary secretion by exposure to radiation and found that impaired secretion is suppressed by quercetin intake. Moreover, secretion levels were enhanced in quercetin-fed normal mice. To elucidate the mechanisms of these effects on salivary secretion, we conducted an analysis using mouse submandibular gland tissues, a human salivary gland epithelial cell line (HSY), and mouse aortic endothelial cells (MAECs). The results showed that quercetin augments aquaporin 5 (AQP5) expression and calcium uptake, and suppresses oxidative stress and inflammatory responses induced by radiation exposure, suggesting that quercetin intake may be an effective method to treat impaired salivary secretion.
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Affiliation(s)
- Ayako Takahashi
- Department of Pathology, Tsurumi University School of Dental Medicine, Yokohama, Japan
| | - Hiroko Inoue
- Department of Pathology, Tsurumi University School of Dental Medicine, Yokohama, Japan
- Department of Pharmaceutical Sciences, Nihon Pharmaceutical University, Saitama, Japan
| | - Kenji Mishima
- Division of Pathology, Department of Oral Diagnostic Sciences, School of Dentistry, Showa University, Tokyo, Japan
| | - Fumio Ide
- Department of Pathology, Tsurumi University School of Dental Medicine, Yokohama, Japan
| | - Ryoko Nakayama
- Department of Pathology, Tsurumi University School of Dental Medicine, Yokohama, Japan
| | - Ayaka Hasaka
- Department of Pathology, Tsurumi University School of Dental Medicine, Yokohama, Japan
| | - Koufuchi Ryo
- Department of Pathology, Tsurumi University School of Dental Medicine, Yokohama, Japan
| | - Yumi Ito
- Department of Pathology, Tsurumi University School of Dental Medicine, Yokohama, Japan
| | - Takashi Sakurai
- Department of Radiopraxis Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
| | - Yoshinori Hasegawa
- Department of Human Genome Research, Kazusa DNA Research Institute, Chiba, Japan
| | - Ichiro Saito
- Department of Pathology, Tsurumi University School of Dental Medicine, Yokohama, Japan
- * E-mail:
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Satoh H. Pharmacological effectiveness of the active phytochemicals contained in foods and herbs. JOURNAL OF COMPLEMENTARY MEDICINE RESEARCH 2014; 3:196-200. [PMID: 26401373 PMCID: PMC4576811 DOI: 10.5455/jice.20140917122310] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 09/17/2014] [Indexed: 01/08/2023]
Abstract
Food ingestions generally regulate many physiological functions to maintain a healthy life. Furthermore, herbal medicine is prescribed for the prevention and the treatment of various diseases. There are not a few herbal medicine-derived drugs (phytochemicals) clinically using now. The phytochemicals such as digitalis, curare, morphine, quinidine, atropine, and so on are so much important drugs for clinical treatments. Herbal medicine and foods are composed of many constituents. The pharmacological actions that contain phytochemicals are exerted each by each mediated through different receptors, ionic channels, and cellular signal transductions. Thus, they produce multiple pharmacological and pathophysiological functions mediated by the complex interactions with lots of the ingredients.
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Affiliation(s)
- Hiroyasu Satoh
- Health Life Science, Shitennoji University, Habikino, Osaka, Japan
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12
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Penso J, Cordeiro KC, da Cunha CR, da Silva Castro PF, Martins DR, Lião LM, Rocha ML, de Oliveira V. Vasorelaxant activity of 7-β-O-glycosides biosynthesized from flavonoids. Eur J Pharmacol 2014; 733:75-80. [DOI: 10.1016/j.ejphar.2014.03.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 03/06/2014] [Accepted: 03/10/2014] [Indexed: 01/01/2023]
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Zhao L, Liu L, Li J. Qualitative and Quantitative Analysis of Five Bioactive Flavonoids in <i>Salix bordensis</i> Turcz. by HPLC-DAD and HPLC-ESI-MS. ACTA ACUST UNITED AC 2014. [DOI: 10.4236/ajac.2014.513094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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14
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Nishida S, Satoh H. Role of gap junction involved with endothelium-derived hyperpolarizing factor for the quercetin-induced vasodilatation in rat mesenteric artery. Life Sci 2013; 92:752-6. [PMID: 23435092 DOI: 10.1016/j.lfs.2013.02.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2012] [Revised: 01/14/2013] [Accepted: 02/04/2013] [Indexed: 10/27/2022]
Abstract
AIMS Modulation of vasodilating actions by quercetin, a kind of flavonoid, was investigated using rat mesenteric arterial ring strips. MAIN METHODS Ring strips (1mm) of rat mesenteric artery were used. The specimens were kept at 36.5 °C in Krebs-Henseleit solution oxygenated with 95% O(2) and 5% CO(2). KEY FINDINGS Quercetin (0.1 to 100 μM) dilated the contraction induced by norepinephrine (1 μM) in a concentration-dependent manner. The quercetin-induced vasodilatation was almost resistant to both 100 μM L-N(G)-nitro arginine methyl ester (L-NAME) and 100 μM indomethacin. At 1mM tetraethylammonium (a KCa channel inhibitor) decreased the quercetin-induced vasodilatation, which was resistant to L-NAME and indomethacin, but not significantly. L-NAME- and indomethacin-resistant quercetin-induced vasodilatation was significantly attenuated by 100 μM 18α- and 50 μM 18β-glycyrrhetinic acids (gap junction inhibitors). Endothelium removal as well significantly attenuated the vasodilatation to the same extent. SIGNIFICANCE These results indicate that quercetin dilates the mesenteric artery via endothelium-dependent mechanisms, and the dilatation is mainly mediated by gap junctions closely involved with endothelium-derived hyperpolarizing factor (EDHF).
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McCarty MF. Dietary nitrate and reductive polyphenols may potentiate the vascular benefit and alleviate the ulcerative risk of low-dose aspirin. Med Hypotheses 2012; 80:186-90. [PMID: 23265354 DOI: 10.1016/j.mehy.2012.11.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Accepted: 11/17/2012] [Indexed: 12/23/2022]
Abstract
The recent revelation that daily low-dose aspirin not only lowers risk for vascular events, but also can notably decrease risk for a range of adenocarcinomas, decreasing total cancer mortality by about 20%, makes it highly desirable to implement this protective strategy on a population-wide basis. Nonetheless, the fact that low-dose aspirin approximately doubles risk for serious gastrointestinal bleeding may impede health authorities from recommending its use by people judged to be at low cardiovascular risk. Nitric oxide (NO) exerts gastroprotective effects by boosting blood flow and mucus production in the gastric mucosa - effects which demonstrably oppose the pro-ulcerative impact of aspirin and other NSAIDs. A nitrate-rich diet, as well as ingestion of reductive catechol-bearing polyphenols, can collaborate in promoting NO generation in gastric juice, and they are protective in rodent models of gastric ulceration. Moreover, a high-nitrate diet, as well as certain reductive polyphenols such as epicatechin and quercetin, can exert platelet-stabilizing effects complementary to those of aspirin, and act in other ways to preserve vascular health. Hence, diets rich in nitrate and reductive polyphenols have the potential to amplify the vascular-protective benefits of low-dose aspirin, while diminishing its pro-ulcerative risk. Low-dose aspirin may be more unequivocally recommendable within the context of such a dietary strategy.
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Affiliation(s)
- Mark F McCarty
- NutriGuard Research, 1051 Hermes Ave., Encinitas, CA 92024, United States.
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16
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Jang HS, Han JH, Jeong JY, Sohn UD. Protective Effect of ECQ on Rat Reflux Esophagitis Model. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2012; 16:455-62. [PMID: 23269908 PMCID: PMC3526751 DOI: 10.4196/kjpp.2012.16.6.455] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Revised: 11/12/2012] [Accepted: 11/21/2012] [Indexed: 01/20/2023]
Abstract
This study was designed to determine the protective effect of Rumex Aquaticus Herba extracts containing quercetin-3-β-D-glucuronopyranoside (ECQ) on experimental reflux esophagitis. Reflux esophagitis was induced by surgical procedure. The rats were divided into seven groups, namely normal group, control group, ECQ (1, 3, 10, 30 mg/kg) group and omeprazole (30 mg/kg) group. ECQ and omeprazole groups received intraduodenal administration. The Rats were starved for 24 hours before the experiments, but were freely allowed to drink water. ECQ group attenuated the gross esophagitis significantly compared to that treated with omeprazole in a dose-dependent manner. ECQ decreased the volume of gastric juice and increased the gastric pH, which are similar to those of omeprazole group. In addition, ECQ inhibited the acid output effectively in reflux esophagitis. Significantly increased amounts of malondialdehyde (MDA), myeloperoxidase (MPO) activity and the mucosal depletion of reduced glutathione (GSH) were observed in the reflux esophagitis. ECQ administration attenuated the decrement of the GSH levels and affected the MDA levels and MPO activity. These results suggest that the ECQ has a protective effect which may be attributed to its multiple effects including anti-secretory, anti-oxidative and anti-inflammatory actions on reflux esophagitis in rats.
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Affiliation(s)
- Hyeon-Soon Jang
- Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea
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Kim Y, Kim WJ, Cha EJ. Quercetin-induced Growth Inhibition in Human Bladder Cancer Cells Is Associated with an Increase in Ca-activated K Channels. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2011; 15:279-83. [PMID: 22128260 DOI: 10.4196/kjpp.2011.15.5.279] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2011] [Revised: 10/03/2011] [Accepted: 10/09/2011] [Indexed: 12/25/2022]
Abstract
Quercetin (3,3',4',5,7-pentahydroxyflavone) is an attractive therapeutic flavonoid for cancer treatment because of its beneficial properties including apoptotic, antioxidant, and antiproliferative effects on cancer cells. However, the exact mechanism of action of quercetin on ion channel modulation is poorly understood in bladder cancer 253J cells. In this study, we demonstrated that large conductance Ca(2+)-activated K(+) (BK(Ca)) or MaxiK channels were functionally expressed in 253J cells, and quercetin increased BK(Ca) current in a concentration dependent and reversible manner using a whole cell patch configuration. The half maximal activation concentration (IC(50)) of quercetin was 45.5±7.2 µM. The quercetin-evoked BK(Ca) current was inhibited by tetraethylammonium (TEA; 5 mM) a non-specific BK(Ca) blocker and iberiotoxin (IBX; 100 nM) a BK(Ca)-specific blocker. Quercetin-induced membrane hyperpolarization was measured by fluorescence-activated cell sorting (FACS) with voltage sensitive dye, bis (1,3-dibutylbarbituric acid) trimethine oxonol (DiBAC(4)(3); 100 nM). Quercetin-evoked hyperpolarization was prevented by TEA. Quercetin produced an antiproliferative effect (30.3±13.5%) which was recovered to 53.3±10.5% and 72.9±3.7% by TEA and IBX, respectively. Taken together our results indicate that activation of BK(Ca) channels may be considered an important target related to the action of quercetin on human bladder cancer cells.
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Affiliation(s)
- Yangmi Kim
- Department of Physiology, Chungbuk National University, Cheongju 361-763, Korea
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