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Connolly K, Batacan R, Jackson D, Fenning AS. Effects of epicatechin on cardiovascular function in middle-aged diet-induced obese rat models of metabolic syndrome. Br J Nutr 2024; 131:593-605. [PMID: 37732427 PMCID: PMC10803822 DOI: 10.1017/s000711452300209x] [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: 05/10/2023] [Revised: 08/19/2023] [Accepted: 09/14/2023] [Indexed: 09/22/2023]
Abstract
The current study aimed to investigate the cardiovascular effects of epicatechin, a flavonoid found in green tea and cocoa, in attenuating complications associated with metabolic syndrome in diet-induced obese rats. Male Wistar-Kyoto (WKY) rats aged 16 weeks were fed either standard rat chow or given a high-fat-high-carbohydrate (HFHC) diet for 20 weeks. Epicatechin treatment (5 mg/kg/d) was administered to a subset of WKY rats commencing at week 8 of the 20 week HFHC feeding period. Body weights, food, water and energy intakes, blood pressure, heart rate and glucose tolerance were measured throughout the treatment period. Oxidative stress and inflammatory markers, lipid levels, cardiac collagen deposition, cardiac electrical function, aortic and mesenteric vessel reactivity were examined after the treatment. Twenty weeks of HFHC feeding in WKY rats resulted in the development of metabolic syndrome indicated by the presence of abdominal obesity, dyslipidaemia, glucose intolerance and increased blood pressure. Epicatechin treatment was found to enhance the oxidative stress status in HFHC groups through an increase in serum nitric oxide levels and a decrease in 8-isoprostane concentrations. Furthermore, WKY-HFHC rats displayed a decrease in IL-6 levels. The lipid profiles in HFHC groups showed improvement, with a decrease in LDL-cholesterol and TAG and an increase in HDL-cholesterol levels observed in WKY-HFHC rats. However, epicatechin was not effective in preventing weight gain, glucose intolerance or hypertension in HFHC fed rats. Overall, the results of this study suggest that epicatechin has the potential to improve the underlying mechanisms associated with metabolic syndrome in obese rats.
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Affiliation(s)
- Kylie Connolly
- School of Health, Medical and Applied Sciences, Central Queensland University, Bruce Highway, Rockhampton, QLD4701, Australia
| | - Romeo Batacan
- School of Health, Medical and Applied Sciences, Central Queensland University, Bruce Highway, Rockhampton, QLD4701, Australia
| | - Douglas Jackson
- Australian Catholic University, 40 Edward St, North Sydney, NSW2060, Australia
| | - Andrew Stuart Fenning
- School of Health, Medical and Applied Sciences, Central Queensland University, Bruce Highway, Rockhampton, QLD4701, Australia
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2
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Amponsah-Offeh M, Diaba-Nuhoho P, Speier S, Morawietz H. Oxidative Stress, Antioxidants and Hypertension. Antioxidants (Basel) 2023; 12:281. [PMID: 36829839 PMCID: PMC9952760 DOI: 10.3390/antiox12020281] [Citation(s) in RCA: 25] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 01/18/2023] [Accepted: 01/22/2023] [Indexed: 01/28/2023] Open
Abstract
As a major cause of morbidity and mortality globally, hypertension remains a serious threat to global public health. Despite the availability of many antihypertensive medications, several hypertensive individuals are resistant to standard treatments, and are unable to control their blood pressure. Regulation of the renin-angiotensin-aldosterone system (RAAS) controlling blood pressure, activation of the immune system triggering inflammation and production of reactive oxygen species, leading to oxidative stress and redox-sensitive signaling, have been implicated in the pathogenesis of hypertension. Thus, besides standard antihypertensive medications, which lower arterial pressure, antioxidant medications were tested to improve antihypertensive treatment. We review and discuss the role of oxidative stress in the pathophysiology of hypertension and the potential use of antioxidants in the management of hypertension and its associated organ damage.
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Affiliation(s)
- Michael Amponsah-Offeh
- Institute of Physiology, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Fetscherstr. 74, 01307 Dresden, Germany
- Department of Cardiovascular Research, European Center for Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
| | - Patrick Diaba-Nuhoho
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, 01307 Dresden, Germany
- Department of Paediatric and Adolescent Medicine, Paediatric Haematology and Oncology, University Hospital Münster, 48149 Münster, Germany
| | - Stephan Speier
- Institute of Physiology, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Fetscherstr. 74, 01307 Dresden, Germany
- Paul Langerhans Institute Dresden (PLID) of the Helmholtz Zentrum München at University Clinic Carl Gustav Carus and Faculty of Medicine, Technische Universität Dresden, Fetscherstr. 74, 01307 Dresden, Germany
- German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany
| | - Henning Morawietz
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, 01307 Dresden, Germany
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Ye X, Tang X, Li F, Zhu J, Wu M, Wei X, Wang Y. Green and Oolong Tea Extracts With Different Phytochemical Compositions Prevent Hypertension and Modulate the Intestinal Flora in a High-Salt Diet Fed Wistar Rats. Front Nutr 2022; 9:892801. [PMID: 35600813 PMCID: PMC9121855 DOI: 10.3389/fnut.2022.892801] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 04/11/2022] [Indexed: 12/22/2022] Open
Abstract
Green tea (GT) and oolong tea (OLT) are widely consumed beverages, and their preventive and regulatory effects on hypertension have been reported. However, the interventional effects of GT and OLT on hypertension induced by a high-salt diet and its mechanism have not been fully explored. This study evaluated the anti-hypertensive effects of GT and OLT and their underlying mechanisms. The in vivo anti-hypertensive effects of GT and OLT and their capability to prevent hypertension and regulate the intestinal microbiota in Wistar rats fed with a high-salt diet were evaluated. Our results show that GT and OLT supplementations could regulate oxidative stress, inflammation, gene expression, and parameter levels related to blood pressure (BP) and prevent the increase in BP induced by a high-salt diet. Furthermore, both GT and OLT boosted the richness and diversity of intestinal microbiota, increased the abundance of beneficial bacteria and reduced the abundance of harmful bacteria and conditionally pathogenic bacteria, and regulated the intestinal microbial metabolism pathway related to BP. Among them, OLT presented better effects than GT. These findings indicate that GT and OLT can prevent hypertension caused by high-salt diets, which may be due to the regulation of intestinal flora by GT and OLT.
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Affiliation(s)
- Xin Ye
- Institute of Engineering Food, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Xiaojuan Tang
- Institute of Engineering Food, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Fanglan Li
- Institute of Engineering Food, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Jiangxiong Zhu
- Institute of Engineering Food, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Meirong Wu
- Institute of Engineering Food, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Xinlin Wei
- Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- *Correspondence: Xinlin Wei,
| | - Yuanfeng Wang
- Institute of Engineering Food, College of Life Sciences, Shanghai Normal University, Shanghai, China
- Yuanfeng Wang,
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4
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Esmaeelpanah E, Razavi BM, Hosseinzadeh H. Green tea and metabolic syndrome: A 10-year research update review. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2021; 24:1159-1172. [PMID: 35083002 PMCID: PMC8751745 DOI: 10.22038/ijbms.2021.52980.11943] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 05/22/2021] [Indexed: 11/22/2022]
Abstract
Metabolic syndrome (MetS) has turned into a prevalent condition that has imposed a tremendous financial strain on public health care systems. It is believed that the MetS consists of four main factors (hypertension, dyslipidemia, hyperglycemia, and obesity) and may lead to cardiovascular events. Camellia sinesis, in the form of green tea (GT), is one of the most consuming beverages worldwide. Catechins are the dominant component of green tea leaves. Epigallocatechin gallate has the maximum potency. GT has been widely used as a supplement in various health conditions. As the oxidative stress pathway is one of the probable mechanisms of MetS etiologies and GT beneficial effects, GT may be a novel strategy to overcome the MetS. This review aims to reveal the probable pharmacological effects of GT on MetS. The last 10-year original articles on MetS parameters and GT have been gathered in this review. This manuscript has summarized the probable effects of green tea and its catechins on MetS and focused on each different aspect of MetS separately, which can be used as a basis for further investigations for introducing effective compounds as a way to interfere with MetS. It seems that GT can reduce MetS parameters commonly via anti-inflammatory and anti-oxidative mechanisms. Further clinical trials are needed to confirm the use of GT and its constituents for the treatment of MetS.
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Affiliation(s)
- Elahe Esmaeelpanah
- Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Bibi Marjan Razavi
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hossein Hosseinzadeh
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
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Oyetayo FL, Akomolafe SF, Balogun GB. Effects of Chrysophyllum albidum fruit pulp on haemodynamic parameters, pro-inflammatory markers, antioxidant parameters and critical biomolecules associated with hypertension-in vivo. Inflammopharmacology 2021; 29:825-839. [PMID: 34120250 DOI: 10.1007/s10787-021-00830-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 05/29/2021] [Indexed: 12/31/2022]
Abstract
The effects of Chrysophyllum albidum fruit pulp on haemodynamic parameters, pro-inflammatory markers, antioxidant parameters and critical biomolecules associated with hypertension in vivo were determined. Feeding with supplemented diet with pulp reduced heart rate, mean arterial pressure, systolic and diastolic blood pressure levels of hypertensive-treated groups. Moreover, hypertensive-treated groups fed with fruit pulp supplemented diets had significantly (p < 0.05) lower level of serum pro-inflammatory markers when compared to untreated hypertensive group. Furthermore, feeding with supplemented diet with pulp and captopril administration reduced AChE, BChE, ACE, and arginase activities of hypertensive-treated groups. The fruit pulp supplemented diet also increased antioxidant status of hypertensive-treated groups. This was supported by the histopathological examination of the kidney and heart tissues. These beneficial effects could in part be the explanations of ethnomedicinal uses of the fruit pulp in the management of hypertension. Nevertheless, the higher percentage inclusion of the pulp showed higher antihypertensive effects.
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Affiliation(s)
- Folake Lucy Oyetayo
- Department of Biochemistry, Faculty of Science, Ekiti State University, Ekiti State, P.M.B. 5363, Ado Ekiti, Nigeria
| | - Seun Funmilola Akomolafe
- Department of Biochemistry, Faculty of Science, Ekiti State University, Ekiti State, P.M.B. 5363, Ado Ekiti, Nigeria.
| | - Gbemisola Beulah Balogun
- Department of Biochemistry, Faculty of Science, Ekiti State University, Ekiti State, P.M.B. 5363, Ado Ekiti, Nigeria
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de Souza P, Mariano LNB, Cechinel-Zanchett CC, Cechinel-Filho V. Promising Medicinal Plants with Diuretic Potential Used in Brazil: State of the Art, Challenges, and Prospects. PLANTA MEDICA 2021; 87:24-37. [PMID: 32957146 DOI: 10.1055/a-1257-0887] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Medicinal plants are used in traditional medicine to treat a wide range of ailments. The knowledge of them is handed down from generation to generation and is described in several pharmacopoeia and in the general literature. The immense biodiversity of the Brazilian flora, covering about 25% of all plant species worldwide, makes Brazil a huge potential source of medicinal plants. Indeed, many of these plant species are already used in the Brazilian ethnopharmacology for their probable effect to induce diuresis, to reduce fluid retention, and to treat cardiovascular and renal disorders. This review article describes and discusses the main native Brazilian medicinal plants (including some of their isolated compounds) used as diuretics. It also gives a comprehensive analysis of the most relevant scientific studies presented to date, as well as addressing a special topic with future prospects for plant species that have not yet been scientifically studied. In brief, several plants can be indicated for more detailed study, with a view to obtain scientific subsidies for a new and effective diuretic medicine in the future. These include Bauhinia forficata, Leandra dasytricha, and Tropaeolum majus. Other species have reputed medicinal properties but lack experimental assays to demonstrate their pharmacological effects (e.g., Mikania hirsutissima, Phyllanthus niruri, and Tagetes minuta). Several active principles are indicated as responsible for the diuretic effects of the plants studied, with emphasis on phenolic compounds as flavonoids, phenolic acids, and xanthones. These results should encourage more detailed preclinical, clinical, and phytochemical investigations on Brazilian plants in the future.
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Affiliation(s)
- Priscila de Souza
- Programa de Pós-graduação em Ciências Farmacêuticas (PPGCF), Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI), Itajaí, Brazil
| | - Luísa Nathália Bolda Mariano
- Programa de Pós-graduação em Ciências Farmacêuticas (PPGCF), Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI), Itajaí, Brazil
- Laboratório de Biologia Cardiovascular, Departamento de Farmacologia, Universidade Federal de Santa Catarina, Florianópolis, Brazil
| | - Camile Cecconi Cechinel-Zanchett
- Programa de Pós-graduação em Ciências Farmacêuticas (PPGCF), Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI), Itajaí, Brazil
| | - Valdir Cechinel-Filho
- Programa de Pós-graduação em Ciências Farmacêuticas (PPGCF), Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí (UNIVALI), Itajaí, Brazil
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Garate-Carrillo A, Navarrete-Yañez V, Ortiz-Vilchis P, Guevara G, Castillo C, Mendoza-Lorenzo P, Ceballos G, Ortiz-Flores M, Najera N, Bustamante-Pozo MM, Rubio-Gayosso I, Villarreal F, Ramirez-Sanchez I. Arginase inhibition by (-)-Epicatechin reverses endothelial cell aging. Eur J Pharmacol 2020; 885:173442. [PMID: 32795514 PMCID: PMC7418791 DOI: 10.1016/j.ejphar.2020.173442] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/28/2020] [Accepted: 07/29/2020] [Indexed: 12/16/2022]
Abstract
Endothelial dysfunction (EnD) occurs with aging and endothelial nitric oxide (NO) production by NO synthase (NOS) can be impaired. Low NO levels have been linked to increased arginase (Ar) activity as Ar competes with NOS for L-arginine. The inhibition of Ar activity can reverse EnD and (-)-epicatechin (Epi) inhibits myocardial Ar activity. In this study, through in silico modeling we demonstrate that Epi interacts with Ar similarly to its inhibitor Norvaline (Norv). Using in vitro and in vivo models of aging, we examined Epi and Norv-inhibition of Ar activity and its endothelium-protective effects. Bovine coronary artery endothelial cells (BCAEC) were treated with Norv (10 μM), Epi (1 μM) or the combination (Epi + Norv) for 48 h. Ar activity increased in aged BCAEC, with decreased NO generation. Treatment decreased Ar activity to levels seen in young cells. Epi and Epi + Norv decreased nitrosylated Ar levels by ~25% in aged cells with lower oxidative stress (~25%) (dihydroethidium) levels. In aged cells, Epi and Epi + Norv restored the eNOS monomer/dimer ratio, protein expression levels and NO production to those of young cells. Furthermore, using 18 month old rats 15 days of treatment with either Epi (1 mg/kg), Norv (10 mg/kg) or combo, decreased hypertension and improved aorta vasorelaxation to acetylcholine, blood NO levels and tetra/dihydribiopterin ratios in cultured rat aortic endothelial cells. In conclusion, results provide evidence that inhibiting Ar with Epi reverses aged-related loss of eNOS function and improves vascular function through the modulation of Ar and eNOS protein levels and activity.
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Affiliation(s)
- Alejandra Garate-Carrillo
- Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA, USA; Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Viridiana Navarrete-Yañez
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Pilar Ortiz-Vilchis
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Gustavo Guevara
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Carmen Castillo
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Patricia Mendoza-Lorenzo
- División Académica de Ciencias Básicas, Unidad Chontalpa, Universidad Juárez Autónoma de Tabasco, Tabasco, Mexico
| | - Guillermo Ceballos
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Miguel Ortiz-Flores
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Nayelli Najera
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Moises Muratt Bustamante-Pozo
- Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA, USA; Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Ivan Rubio-Gayosso
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico
| | - Francisco Villarreal
- Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA, USA; VA San Diego Health Care, San Diego, CA, USA
| | - Israel Ramirez-Sanchez
- Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA, USA; Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico.
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8
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Irwin JC, Fenning AS, Vella RK. Olive oil should not be used as a vehicle for administrating bioactive lipids in cardiovascular studies. Nutr Metab Cardiovasc Dis 2020; 30:847-848. [PMID: 32127331 DOI: 10.1016/j.numecd.2020.02.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/01/2020] [Accepted: 02/12/2020] [Indexed: 11/28/2022]
Affiliation(s)
- Jordon C Irwin
- School of Health, Medical and Applied Sciences, Central Queensland University, Bruce Highway, North Rockhampton, Queensland, 4702, Australia.
| | - Andrew S Fenning
- School of Health, Medical and Applied Sciences, Central Queensland University, Bruce Highway, North Rockhampton, Queensland, 4702, Australia
| | - Rebecca K Vella
- School of Health, Medical and Applied Sciences, Central Queensland University, Bruce Highway, North Rockhampton, Queensland, 4702, Australia
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Irwin JC, Fenning AS, Vella RK. Geranylgeraniol prevents statin-induced skeletal muscle fatigue without causing adverse effects in cardiac or vascular smooth muscle performance. Transl Res 2020; 215:17-30. [PMID: 31491372 DOI: 10.1016/j.trsl.2019.08.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 08/01/2019] [Accepted: 08/13/2019] [Indexed: 12/26/2022]
Abstract
The administration of geranylgeranyl pyrophosphate (GGPP) (or its precursor, geranylgeraniol [GGOH]) has been shown by several in vitro studies to be capable of abrogating statin-induced myotoxicity. Nonetheless, the potential of GGPP repletion to prevent statin-associated muscle symptoms (SAMS) in vivo is yet to be investigated. Therefore, this study aimed to evaluate the ability of GGOH to prevent SAMS in rodents. Female Wistar rats (12 weeks of age) were randomised to 1 of 4 treatment groups: control, control with GGOH, simvastatin or simvastatin with GGOH. Ex vivo assessment of force production was conducted in skeletal muscles of varying fiber composition. Ex vivo left ventricular performance and blood vessel function was also assessed to determine if the administration of GGOH caused adverse changes in these parameters. Statin administration was associated with reduced force production in fast-twitch glycolytic muscle, but coadministration with GGOH completely abrogated this effect. Additionally, GGOH improved the performance of muscles not adversely affected by simvastatin (ie, those with a greater proportion of slow-twitch oxidative fibers), and increased force production in the control animals. Neither control nor statin-treated rodents given GGOH exhibited adverse changes in cardiac function. Vascular relaxation was also maintained following treatment with GGOH. The findings of this study demonstrate that GGOH can prevent statin-induced skeletal muscle fatigue in rodents without causing adverse changes in cardiovascular function. Further studies to elucidate the exact mechanisms underlying the effects observed in this investigation are warranted.
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Affiliation(s)
- Jordon C Irwin
- School of Health, Medical and Applied Sciences, Central Queensland University, North Rockhampton, Queensland, Australia.
| | - Andrew S Fenning
- School of Health, Medical and Applied Sciences, Central Queensland University, North Rockhampton, Queensland, Australia
| | - Rebecca K Vella
- School of Health, Medical and Applied Sciences, Central Queensland University, North Rockhampton, Queensland, Australia
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Statins with different lipophilic indices exert distinct effects on skeletal, cardiac and vascular smooth muscle. Life Sci 2019; 242:117225. [PMID: 31881229 DOI: 10.1016/j.lfs.2019.117225] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 10/20/2019] [Accepted: 12/23/2019] [Indexed: 01/14/2023]
Abstract
AIMS Data concerning the influence of statin lipophilicity on the myotoxic and pleiotropic effects of statins is conflicting, and mechanistic head-to-head comparison studies evaluating this parameter are limited. In order to address the disparity, this mechanistic investigation aimed to assess the effects of two short-acting statins with different lipophilic indices on skeletal, cardiac and vascular smooth muscle physiology. MATERIALS AND METHODS Young female Wistar rats were randomised to simvastatin (80 mg kg-1 day-1), pravastatin (160 mg kg-1 day-1) or control treatment groups. Changes in functional muscle performance were assessed, as well as mRNA levels of genes relating to atrophy, hypertrophy, mitochondrial function and/or oxidative stress. KEY FINDINGS There were no significant differences in the mRNA profiles of isolated skeletal muscles amongst the treatment groups. In terms of skeleletal muscle performance, simvastatin reduced functionality but treatment with pravastatin significantly improved force production. Rodents given simvastatin demonstrated comparable myocardial integrity to the control group. Conversely, pravastatin reduced left ventricular action potential duration, diastolic stiffness and Mhc-β expression. Pravastatin improved endothelium-dependent relaxation, particularly in muscular arteries, but this effect was absent in the simvastatin-treated rats. The responsiveness of isolated blood vessels to noradrenaline also differed between the statin groups. The findings of this study support that the effects of statins on skeletal, cardiac and vascular smooth muscle vary with their lipophilic indices. SIGNIFICANCE The results of this work have important implications for elucidating the mechanisms responsible for the myotoxic and pleiotropic effects of statins.
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11
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Luo D, Chen X, Zhu X, Liu S, Li J, Xu J, Zhao J, Ji X. Pu-Erh Tea Relaxes the Thoracic Aorta of Rats by Reducing Intracellular Calcium. Front Pharmacol 2019; 10:1430. [PMID: 31849675 PMCID: PMC6892945 DOI: 10.3389/fphar.2019.01430] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 11/08/2019] [Indexed: 01/05/2023] Open
Abstract
Previous studies suggested that pu-erh tea aqueous extract could lower blood pressure and ameliorate hypertension symptoms. However, the antihypertension mechanisms of pu-erh tea remain unclear. In this work, the direct effects of pu-erh tea on vessels and cells were investigated by detecting isometric tension and intracellular calcium ([Ca2+]i), respectively. Additionally, to identify the main active components, the aqueous extract of pu-erh was separated by organic solvents to obtain various fractions, and the effects of these fractions on arteries were assessed. The results showed that pu-erh aqueous extract vasodilated rat thoracic aortas preconstricted by phenylephrine or KCl. These vasodilation effects were not significantly affected by the removal of the endothelium or by preincubation with potassium channel blockers (tetraethylammonium, glibenclamide, aminopyridine, or barium chloride). Moreover, pu-erh aqueous extract could reduce the vessel contractibility induced by CaCl2 and phenylephrine under KCl-depolarizing or Ca2+-free buffer conditions, respectively. Furthermore, pu-erh aqueous extract attenuated the KCl-induced increase in [Ca2+]i in cultured rat aortic smooth muscle A7r5 cells. In addition, the chloroform precipitate of pu-erh aqueous extract produced the most potent vasodilation. Theabrownins (the characteristic components of pu-erh tea) accounted for 41.91 ± 1.09 % of the chloroform precipitate and vasodilated arteries in an endothelium-independent manner. In addition, the vasodilation effect of caffeine was verified. In conclusion, theabrownins and caffeine should be the two main active components in pu-erh tea. Pu-erh aqueous extract vasodilated arteries in an endothelium-independent manner, which might partly be attributed to the decrease in extracellular Ca2+ influx. Moreover, our study provided data on the potential mechanism of the hypotensive actions of pu-erh tea, which might improve our understanding of the effect of pu-erh tea on the prevention and treatment of hypertension.
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Affiliation(s)
- Dan Luo
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Xuejiao Chen
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Xu Zhu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Shuang Liu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Jie Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Jianping Xu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Jinhua Zhao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Xu Ji
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.,Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, China
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12
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Linalyl acetate prevents three related factors of vascular damage in COPD-like and hypertensive rats. Life Sci 2019; 232:116608. [DOI: 10.1016/j.lfs.2019.116608] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 06/25/2019] [Accepted: 06/26/2019] [Indexed: 12/20/2022]
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13
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Zhuravin IA, Dubrovskaya NM, Vasilev DS, Kozlova DI, Kochkina EG, Tumanova NL, Nalivaeva NN. Regulation of Neprilysin Activity and Cognitive Functions in Rats After Prenatal Hypoxia. Neurochem Res 2019; 44:1387-1398. [PMID: 31006092 DOI: 10.1007/s11064-019-02796-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 03/27/2019] [Accepted: 04/10/2019] [Indexed: 12/31/2022]
Abstract
The amyloid-degrading enzyme neprilysin (NEP) is one of the therapeutic targets in prevention and treatment of Alzheimer's disease (AD). As we have shown previously NEP expression in rat parietal cortex (Cx) and hippocampus (Hip) decreases with age and is also significantly reduced after prenatal hypoxia. Following the paradigms for enhancement of NEP expression and activity developed in cell culture, we analysed the efficacy of various compounds able to upregulate NEP using our model of prenatal hypoxia in rats. In addition to the previous data demonstrating that valproic acid can upregulate NEP expression both in neuroblastoma cells and in rat Cx and Hip we have further confirmed that caspase inhibitors can also restore NEP expression in rat Cx reduced after prenatal hypoxia. Here we also report that administration of a green tea catechin epigallocatechin-3-gallate (EGCG) to adult rats subjected to prenatal hypoxia increased NEP activity in blood plasma, Cx and Hip as well as improved memory performance in the 8-arm maze and novel object recognition tests. Moreover, EGCG administration led to an increased number of dendritic spines in the hippocampal CA1 area which correlated with memory enhancement. The data obtained allowed us to conclude that the decrease in the activity of the amyloid-degrading enzyme NEP, as well as a reduction in the number of labile interneuronal contacts in the hippocampus, contribute to early cognitive deficits caused by prenatal hypoxia and that there are therapeutic avenues to restore these deficits via NEP activation which could also be used for designing preventive strategies in AD.
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Affiliation(s)
- I A Zhuravin
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez av, St. Petersburg, Russia, 194223. .,Research Centre, Saint-Petersburg State Pediatric Medical University, St. Petersburg, Russia.
| | - N M Dubrovskaya
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez av, St. Petersburg, Russia, 194223.,Research Centre, Saint-Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - D S Vasilev
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez av, St. Petersburg, Russia, 194223.,Research Centre, Saint-Petersburg State Pediatric Medical University, St. Petersburg, Russia
| | - D I Kozlova
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez av, St. Petersburg, Russia, 194223.,LLC Scientific and Production Company "ABRIS +", St. Petersburg, Russia
| | - E G Kochkina
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez av, St. Petersburg, Russia, 194223
| | - N L Tumanova
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez av, St. Petersburg, Russia, 194223
| | - N N Nalivaeva
- I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez av, St. Petersburg, Russia, 194223.,School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, UK
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Jayeola OC, Oyagbemi AA, Okunlola OI, Olubamiwa O, Omobowale TO, Ajibade TO, Bolaji-Alabi FB, Ogunpolu BS, Falayi OO, Saba AB, Adedapo AA, Yakubu MA, Oluwadun A, Oguntibeju OO. Effect of cocoa powder on hypertension and antioxidant status in uninephrectomized hypertensive rats. Vet World 2019; 13:695-705. [PMID: 32546914 PMCID: PMC7245715 DOI: 10.14202/vetworld.2020.695-705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 02/12/2020] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND AND AIM High salt diet and uninephrectomy are associated with high blood pressure with attendant cardiovascular disease conditions such as hypertension, renal damage, myocardial infarction, and stroke. The aim of this study was to investigate the beneficial effects of consumption of cocoa and cocoa-containing products in the management of high blood pressure in uninephrectomized hypertensive rats. MATERIALS AND METHODS The effect of cocoa powder on blood pressure, markers of inflammation, oxidative stress, and histopathology were investigated in uninephrectomized animals fed with cocoa feed alone or in combination with a high salt diet. Male rats were randomly divided into five groups: Group A was the control group and fed with normal feed alone, Group B was fed with cocoa feed alone, Group C was fed with high salt diet (8% salt), GroupD was fed with cocoa-feed compounded with 8% salt for 4weeks after uninephrectomy, and GroupE was uninephrectomized rats on a normal diet. The left kidneys of animals in GroupsC, D, and E were removed by surgery. After 4weeks of treatment, the systolic, diastolic, and mean arterial blood pressure was measured. The serum markers of renal damage and oxidative stress were determined. Histological examination was also performed on renal and cardiac tissues. RESULTS Results showed significant increases in biomarkers of oxidative stress, inflammation, and renal damage with a concomitant decrease in antioxidant status in hypertensive uninephrectomized rats. Cocoa feed, however, significantly improved blood pressure and nitric oxide bioavailability, antioxidant status and reduced markers of inflammation and oxidative stress. CONCLUSION These findings show that cocoa powder could be used to maintain blood pressure levels in hypertensive rats through its antioxidant capacity.
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Affiliation(s)
| | - Ademola Adetokunbo Oyagbemi
- Department of Veterinary Physiology and Biochemistry, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
| | | | | | | | - Temitayo Olabisi Ajibade
- Department of Veterinary Physiology and Biochemistry, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
| | | | - Blessing Seun Ogunpolu
- Department of Veterinary Medicine, Faculty of Veterinary Medicine, University of Ibadan, Nigeria
| | - Olufunke Olubunmi Falayi
- Department of Veterinary Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
| | - Adebowale Benard Saba
- Department of Veterinary Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
| | - Adeolu Alex Adedapo
- Department of Veterinary Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
| | - Momoh Audu Yakubu
- Department of Environmental and Interdisciplinary Sciences, College of Science, Engineering and Technology, Vascular Biology Unit, Center for Cardiovascular Diseases, College of Pharmacy and Health Sciences (COPHS), Texas Southern University, Houston, Texas, USA
| | - Afolabi Oluwadun
- Department of Medical Microbiology, Olabisi Onabanjo University, Sagamu Campus, Sagamu, Nigeria
| | - Oluwafemi Omoniyi Oguntibeju
- Phytomedicine and Phytochemistry Group, Department of Biomedical Sciences, Faculty of Health and Wellness Sciences, Cape Peninsula University of Technology, Bellville 7535, South Africa
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15
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Maaliki D, Shaito AA, Pintus G, El-Yazbi A, Eid AH. Flavonoids in hypertension: a brief review of the underlying mechanisms. Curr Opin Pharmacol 2019; 45:57-65. [DOI: 10.1016/j.coph.2019.04.014] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 02/12/2019] [Accepted: 04/16/2019] [Indexed: 12/21/2022]
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