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Du Y, Wan H, Huang P, Yang J, He Y. A critical review of Astragalus polysaccharides: From therapeutic mechanisms to pharmaceutics. Pharmacotherapy 2022; 147:112654. [DOI: 10.1016/j.biopha.2022.112654] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 01/09/2022] [Accepted: 01/16/2022] [Indexed: 12/12/2022]
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2
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De Rosa S, Iaconetti C, Eyileten C, Yasuda M, Albanese M, Polimeni A, Sabatino J, Sorrentino S, Postula M, Indolfi C. Flow-Responsive Noncoding RNAs in the Vascular System: Basic Mechanisms for the Clinician. J Clin Med 2022; 11:jcm11020459. [PMID: 35054151 PMCID: PMC8777617 DOI: 10.3390/jcm11020459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/11/2022] [Accepted: 01/14/2022] [Indexed: 12/10/2022] Open
Abstract
The vascular system is largely exposed to the effect of changing flow conditions. Vascular cells can sense flow and its changes. Flow sensing is of pivotal importance for vascular remodeling. In fact, it influences the development and progression of atherosclerosis, controls its location and has a major influx on the development of local complications. Despite its importance, the research community has traditionally paid scarce attention to studying the association between different flow conditions and vascular biology. More recently, a growing body of evidence has been accumulating, revealing that ncRNAs play a key role in the modulation of several biological processes linking flow-sensing to vascular pathophysiology. This review summarizes the most relevant evidence on ncRNAs that are directly or indirectly responsive to flow conditions to the benefit of the clinician, with a focus on the underpinning mechanisms and their potential application as disease biomarkers.
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Affiliation(s)
- Salvatore De Rosa
- Department of Medical and Surgical Sciences, Magna Graecia University, 88100 Catanzaro, Italy; (C.I.); (M.Y.); (M.A.); (A.P.); (J.S.); (S.S.)
- Correspondence: (S.D.R.); (C.I.)
| | - Claudio Iaconetti
- Department of Medical and Surgical Sciences, Magna Graecia University, 88100 Catanzaro, Italy; (C.I.); (M.Y.); (M.A.); (A.P.); (J.S.); (S.S.)
| | - Ceren Eyileten
- Department of Experimental and Clinical Pharmacology, Centre for Preclinical Research and Technology CePT, Medical University of Warsaw, 02-097 Warsaw, Poland; (C.E.); (M.P.)
| | - Masakazu Yasuda
- Department of Medical and Surgical Sciences, Magna Graecia University, 88100 Catanzaro, Italy; (C.I.); (M.Y.); (M.A.); (A.P.); (J.S.); (S.S.)
| | - Michele Albanese
- Department of Medical and Surgical Sciences, Magna Graecia University, 88100 Catanzaro, Italy; (C.I.); (M.Y.); (M.A.); (A.P.); (J.S.); (S.S.)
| | - Alberto Polimeni
- Department of Medical and Surgical Sciences, Magna Graecia University, 88100 Catanzaro, Italy; (C.I.); (M.Y.); (M.A.); (A.P.); (J.S.); (S.S.)
| | - Jolanda Sabatino
- Department of Medical and Surgical Sciences, Magna Graecia University, 88100 Catanzaro, Italy; (C.I.); (M.Y.); (M.A.); (A.P.); (J.S.); (S.S.)
| | - Sabato Sorrentino
- Department of Medical and Surgical Sciences, Magna Graecia University, 88100 Catanzaro, Italy; (C.I.); (M.Y.); (M.A.); (A.P.); (J.S.); (S.S.)
| | - Marek Postula
- Department of Experimental and Clinical Pharmacology, Centre for Preclinical Research and Technology CePT, Medical University of Warsaw, 02-097 Warsaw, Poland; (C.E.); (M.P.)
| | - Ciro Indolfi
- Department of Medical and Surgical Sciences, Magna Graecia University, 88100 Catanzaro, Italy; (C.I.); (M.Y.); (M.A.); (A.P.); (J.S.); (S.S.)
- Mediterranea Cardiocentro, 80122 Naples, Italy
- Correspondence: (S.D.R.); (C.I.)
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Stam K, Clauss S, Taverne YJHJ, Merkus D. Chronic Thromboembolic Pulmonary Hypertension - What Have We Learned From Large Animal Models. Front Cardiovasc Med 2021; 8:574360. [PMID: 33937352 PMCID: PMC8085273 DOI: 10.3389/fcvm.2021.574360] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 03/08/2021] [Indexed: 12/21/2022] Open
Abstract
Chronic thrombo-embolic pulmonary hypertension (CTEPH) develops in a subset of patients after acute pulmonary embolism. In CTEPH, pulmonary vascular resistance, which is initially elevated due to the obstructions in the larger pulmonary arteries, is further increased by pulmonary microvascular remodeling. The increased afterload of the right ventricle (RV) leads to RV dilation and hypertrophy. This RV remodeling predisposes to arrhythmogenesis and RV failure. Yet, mechanisms involved in pulmonary microvascular remodeling, processes underlying the RV structural and functional adaptability in CTEPH as well as determinants of the susceptibility to arrhythmias such as atrial fibrillation in the context of CTEPH remain incompletely understood. Several large animal models with critical clinical features of human CTEPH and subsequent RV remodeling have relatively recently been developed in swine, sheep, and dogs. In this review we will discuss the current knowledge on the processes underlying development and progression of CTEPH, and on how animal models can help enlarge understanding of these processes.
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Affiliation(s)
- Kelly Stam
- Department of Cardiology, Erasmus University Medical Center Rotterdam, Rotterdam, Netherlands
| | - Sebastian Clauss
- Department of Medicine I, University Hospital Munich, Ludwig-Maximilians University Munich, Munich, Germany.,Institute of Surgical Research at the Walter-Brendel-Centre of Experimental Medicine, University Hospital, LMU Munich, Munich, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Munich, Munich Heart Alliance, Munich, Germany
| | - Yannick J H J Taverne
- Department of Cardiothoracic Surgery, Erasmus University Medical Center Rotterdam, Rotterdam, Netherlands
| | - Daphne Merkus
- Department of Cardiology, Erasmus University Medical Center Rotterdam, Rotterdam, Netherlands.,Institute of Surgical Research at the Walter-Brendel-Centre of Experimental Medicine, University Hospital, LMU Munich, Munich, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Munich, Munich Heart Alliance, Munich, Germany
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Making a case for metallothioneins conferring cardioprotection in pulmonary hypertension. Med Hypotheses 2020; 137:109572. [DOI: 10.1016/j.mehy.2020.109572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 12/30/2019] [Accepted: 01/15/2020] [Indexed: 11/23/2022]
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Stam K, Cai Z, van der Velde N, van Duin R, Lam E, van der Velden J, Hirsch A, Duncker DJ, Merkus D. Cardiac remodelling in a swine model of chronic thromboembolic pulmonary hypertension: comparison of right vs. left ventricle. J Physiol 2019; 597:4465-4480. [PMID: 31194256 PMCID: PMC6852085 DOI: 10.1113/jp277896] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 06/07/2019] [Indexed: 12/11/2022] Open
Abstract
KEY POINTS Right ventricle (RV) function is the most important determinant of survival and quality of life in patients with chronic thromboembolic pulmonary hypertension (CTEPH). The changes in right and left ventricle gene expression that contribute to ventricular remodelling are incompletely investigated. RV remodelling in our CTEPH swine model is associated with increased expression of the genes involved in inflammation (TGFβ), oxidative stress (ROCK2, NOX1 and NOX4), and apoptosis (BCL2 and caspase-3). Alterations in ROCK2 expression correlated inversely with RV contractile reserve during exercise. Since ROCK2 has been shown to be involved in hypertrophy, oxidative stress, fibrosis and endothelial dysfunction, ROCK2 inhibition may present a viable therapeutic target in CTEPH. ABSTRACT Right ventricle (RV) function is the most important determinant of survival and quality of life in patients with chronic thromboembolic pulmonary hypertension (CTEPH). The present study investigated whether the increased cardiac afterload is associated with (i) cardiac remodelling and hypertrophic signalling; (ii) changes in angiogenic factors and capillary density; and (iii) inflammatory changes associated with oxidative stress and interstitial fibrosis. CTEPH was induced in eight chronically instrumented swine by chronic nitric oxide synthase inhibition and up to five weekly pulmonary embolizations. Nine healthy swine served as a control. After 9 weeks, RV function was assessed by single beat analysis of RV-pulmonary artery (PA) coupling at rest and during exercise, as well as by cardiac magnetic resonance imaging. Subsequently, the heart was excised and RV and left ventricle (LV) tissues were processed for molecular and histological analyses. Swine with CTEPH exhibited significant RV hypertrophy in response to the elevated PA pressure. RV-PA coupling was significantly reduced, correlated inversely with pulmonary vascular resistance and did not increase during exercise in CTEPH swine. Expression of genes associated with hypertrophy (BNP), inflammation (TGFβ), oxidative stress (ROCK2, NOX1 and NOX4), apoptosis (BCL2 and caspase-3) and angiogenesis (VEGFA) were increased in the RV of CTEPH swine and correlated inversely with RV-PA coupling during exercise. In the LV, only significant changes in ROCK2 gene-expression occurred. In conclusion, RV remodelling in our CTEPH swine model is associated with increased expression of genes involved in inflammation and oxidative stress, suggesting that these processes contribute to RV remodelling and dysfunction in CTEPH and hence represent potential therapeutic targets.
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Affiliation(s)
- Kelly Stam
- Department of Cardiology, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
| | - Zongye Cai
- Department of Cardiology, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
| | - Nikki van der Velde
- Department of Cardiology, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
- Department of Radiology and Nuclear Medicine, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
| | - Richard van Duin
- Department of Cardiology, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
| | - Esther Lam
- Department of Cardiology, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
| | - Jolanda van der Velden
- Amsterdam UMCVrije Universiteit Amsterdam, Physiology, Amsterdam Cardiovascular SciencesAmsterdamThe Netherlands
| | - Alexander Hirsch
- Department of Cardiology, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
- Department of Radiology and Nuclear Medicine, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
| | - Dirk J Duncker
- Department of Cardiology, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
| | - Daphne Merkus
- Department of Cardiology, Erasmus MCUniversity Medical Center RotterdamRotterdamThe Netherlands
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Schlüter KD, Kutsche HS, Hirschhäuser C, Schreckenberg R, Schulz R. Review on Chamber-Specific Differences in Right and Left Heart Reactive Oxygen Species Handling. Front Physiol 2018; 9:1799. [PMID: 30618811 PMCID: PMC6304434 DOI: 10.3389/fphys.2018.01799] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 11/29/2018] [Indexed: 01/21/2023] Open
Abstract
Reactive oxygen species (ROS) exert signaling character (redox signaling), or damaging character (oxidative stress) on cardiac tissue depending on their concentration and/or reactivity. The steady state of ROS concentration is determined by the interplay between its production (mitochondrial, cytosolic, and sarcolemmal enzymes) and ROS defense enzymes (mitochondria, cytosol). Recent studies suggest that ROS regulation is different in the left and right ventricle of the heart, specifically by a different activity of superoxide dismutase (SOD). Mitochondrial ROS defense seems to be lower in right ventricular tissue compared to left ventricular tissue. In this review we summarize the current evidence for heart chamber specific differences in ROS regulation that may play a major role in an observed inability of the right ventricle to compensate for cardiac stress such as pulmonary hypertension. Based on the current knowledge regimes to increase ROS defense in right ventricular tissue should be in the focus for the development of future therapies concerning right heart failure.
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Affiliation(s)
| | - Hanna Sarah Kutsche
- Department of Physiology, Justus-Liebig-University Giessen, Giessen, Germany
| | | | - Rolf Schreckenberg
- Department of Physiology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Rainer Schulz
- Department of Physiology, Justus-Liebig-University Giessen, Giessen, Germany
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Huo Y, Kassab GS. Coronary Blood Flow Is Increased in RV Hypertrophy, but the Shape of Normalized Waves Is Preserved Throughout the Arterial Tree. Front Physiol 2018; 9:675. [PMID: 29904356 PMCID: PMC5990630 DOI: 10.3389/fphys.2018.00675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 05/15/2018] [Indexed: 11/23/2022] Open
Abstract
A pulsatile hemodynamic analysis was carried out in the right coronary arterial (RCA) tree of control and RV hypertrophy (RVH) hearts. The shape of flow and wall shear stress (WSS) waves was hypothesized to be maintained throughout the RCA tree in RVH (i.e., similar patterns of normalized flow and WSS waves in vessels of various sizes). Consequently, we reconstructed the entire RCA tree down to the first capillary bifurcation of control and RVH hearts based on measured morphometric data. A Womersley-type model was used to compute the flow and WSS waves in the tree. The hemodynamic parameters obtained from experimental measurements were incorporated into the numerical model. Given an increased number of arterioles, the mean and amplitude of flow waves at the inlet of RCA tree in RVH was found to be two times larger than that in control, but no significant differences (p > 0.05) were found in precapillary arterioles. The increase of stiffness in RCA of RVH preserved the shape of normalized flow and WSS waves, but increased the PWV in coronary arteries and reduced the phase angle difference for the waves between the most proximal RCA and the most distal precapillary arteriole. The study is important for understanding pulsatile coronary blood flow in ventricular hypertrophy.
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Affiliation(s)
- Yunlong Huo
- PKU-HKUST Shenzhen-Hongkong Institution, Shenzhen, China
- Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, China
| | - Ghassan S. Kassab
- California Medical Innovations Institute, San Diego, CA, United States
- *Correspondence: Ghassan S. Kassab
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Anagliptin prevents apoptosis of human umbilical vein endothelial cells by modulating NOX-4 signaling pathways. Biomed Pharmacother 2018; 103:1623-1631. [PMID: 29864951 DOI: 10.1016/j.biopha.2018.04.187] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 04/25/2018] [Accepted: 04/29/2018] [Indexed: 01/03/2023] Open
Abstract
Dipeptidyl peptidase IV (DPP-IV) inhibitors are novel oral anti-hyperglycemic agents. Here, the anti-apoptotic effect of Anagliptin in human umbilical vein endothelial cells (HUVECs) was evaluated. Cultured HUVECs were pre-incubated with Anagliptin, and then treated hydrongen peroxide (H2O2) to induce apoptosis. The apoptosis of HUVECs were detected by viability, LIVE/DEAD staining assay and flow cytometry assays. HUVECs were transfected with plasmid harboring human NADPH oxidases (NOX) 4 or an empty vector. The formation of reactive oxygen species (ROS) was measured by immunofluorescence. Apoptotic and anti-apoptotic factor were detected by Western Blot. Pre-incubation with Anagliptin protected HUVECs from H2O2 induced apoptosis. The transfection assay also indicated that pre-incubation with Anagliptin inhibited the apoptosis of HUVECs induced by NADPH oxidase 4 (NOX-4) overexpression. Immunofluorescence demonstrated that pre-incubation with Anagliptin suppressed the formation of ROS in apoptotic HUVECs. Pre-incubation with Anagliptin inhibited NOX-4 mediated the Bax, caspase-3, cleave caspase-3 and Cyto C overexpression, but up-regulated the protein level of Bcl-2 in HUVECs. The data help us to better understand the effect of Anagliptin on apoptosis, and will be valuable in identifying new targets to prevent the endothelial cell apoptosis after injury.
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NADPH Oxidase Deficiency: A Multisystem Approach. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:4590127. [PMID: 29430280 PMCID: PMC5753020 DOI: 10.1155/2017/4590127] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 10/11/2017] [Accepted: 11/02/2017] [Indexed: 02/07/2023]
Abstract
The immune system is a complex system able to recognize a wide variety of host agents, through different biological processes. For example, controlled changes in the redox state are able to start different pathways in immune cells and are involved in the killing of microbes. The generation and release of ROS in the form of an “oxidative burst” represent the pivotal mechanism by which phagocytic cells are able to destroy pathogens. On the other hand, impaired oxidative balance is also implicated in the pathogenesis of inflammatory complications, which may affect the function of many body systems. NADPH oxidase (NOX) plays a pivotal role in the production of ROS, and the defect of its different subunits leads to the development of chronic granulomatous disease (CGD). The defect of the different NOX subunits in CGD affects different organs. In this context, this review will be focused on the description of the effect of NOX2 deficiency in different body systems. Moreover, we will also focus our attention on the novel insight in the pathogenesis of immunodeficiency and inflammation-related manifestations and on the protective role of NOX2 deficiency against the development of atherosclerosis.
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Han R, Tang F, Lu M, Xu C, Hu J, Mei M, Wang H. Astragalus polysaccharide ameliorates H2O2-induced human umbilical vein endothelial cell injury. Mol Med Rep 2017; 15:4027-4034. [PMID: 28487940 PMCID: PMC5436204 DOI: 10.3892/mmr.2017.6515] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 02/20/2017] [Indexed: 12/23/2022] Open
Abstract
Endothelial dysfunction caused by reactive oxygen species (ROS) has been implicated in numerous cardiovascular diseases. Astragalus polysaccharide (APS), an important bioactive component extracted from the Chinese herb Astragalus membranaceus, has been widely used for the treatment of cardiovascular disease. The present study aimed to investigate the effects of APS on hydrogen peroxide (H2O2)-induced human umbilical vein endothelial cell (HUVEC) injury. Following treatment with 400 µM H2O2 for 24 h, cell viability was decreased and apoptosis was increased. However, pretreatment with APS for 1 h significantly attenuated H2O2-induced injury in HUVECs. In addition, APS decreased intracellular ROS levels, increased the protein expression of endothelial nitric oxide synthase and copper-zinc superoxide dismutase, elevated intracellular cyclic guanosine monophosphate (an activity marker for nitric oxide) levels and restored the mitochondrial membrane potential, compared with cells treated with H2O2 only. In conclusion, the results of the present study suggested that APS may protect HUVECs from injury induced by H2O2 via increasing the cell antioxidant capacity and nitric oxide (NO) bioavailability, which may contribute to the improvement of the imbalance between ROS and NO levels.
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Affiliation(s)
- Ronghui Han
- Key Laboratory of Cardiovascular and Cerebrovascular Drug Research of Liaoning Province, Drug Research Institute, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| | - Futian Tang
- Key Laboratory of Cardiovascular and Cerebrovascular Drug Research of Liaoning Province, Drug Research Institute, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| | - Meili Lu
- Key Laboratory of Cardiovascular and Cerebrovascular Drug Research of Liaoning Province, Drug Research Institute, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| | - Chonghua Xu
- Key Laboratory of Cardiovascular and Cerebrovascular Drug Research of Liaoning Province, Drug Research Institute, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| | - Jin Hu
- Key Laboratory of Cardiovascular and Cerebrovascular Drug Research of Liaoning Province, Drug Research Institute, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| | - Meng Mei
- Key Laboratory of Cardiovascular and Cerebrovascular Drug Research of Liaoning Province, Drug Research Institute, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
| | - Hongxin Wang
- Department of Pharmacology, Key Laboratory of Cardiovascular and Cerebrovascular Drug Research of Liaoning Drug Research Institute, Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
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11
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Protective effects of Astragalus polysaccharides against endothelial dysfunction in hypertrophic rats induced by isoproterenol. Int Immunopharmacol 2016; 38:306-12. [DOI: 10.1016/j.intimp.2016.06.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 05/22/2016] [Accepted: 06/17/2016] [Indexed: 11/21/2022]
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Abstract
Since its discovery in 1999, a number of studies have evaluated the role of Nox1 NADPH oxidase in the cardiovascular system. Nox1 is activated in vascular cells in response to several different agonists, with its activity regulated at the transcriptional level as well as by NADPH oxidase complex formation, protein stabilization and post-translational modification. Nox1 has been shown to decrease the bioavailability of nitric oxide, transactivate the epidermal growth factor receptor, induce pro-inflammatory signalling, and promote cell migration and proliferation. Enhanced expression and activity of Nox1 under pathologic conditions results in excessive production of reactive oxygen species and dysregulated cellular function. Indeed, studies using genetic models of Nox1 deficiency or overexpression have revealed roles for Nox1 in the pathogenesis of cardiovascular diseases ranging from atherosclerosis to hypertension, restenosis and ischaemia/reperfusion injury. These data suggest that Nox1 is a potential therapeutic target for vascular disease, and drug development efforts are ongoing to identify a specific bioavailable inhibitor of Nox1.
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Zhou Z, Rajamani U, Labazi H, Tilley SL, Ledent C, Teng B, Mustafa SJ. Involvement of NADPH oxidase in A2A adenosine receptor-mediated increase in coronary flow in isolated mouse hearts. Purinergic Signal 2015; 11:263-73. [DOI: 10.1007/s11302-015-9451-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2015] [Accepted: 04/16/2015] [Indexed: 12/22/2022] Open
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Mynard JP, Penny DJ, Smolich JJ. Scalability and in vivo validation of a multiscale numerical model of the left coronary circulation. Am J Physiol Heart Circ Physiol 2013; 306:H517-28. [PMID: 24363304 DOI: 10.1152/ajpheart.00603.2013] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Multiscale modeling is a promising tool for the study of coronary hemodynamics. A key strength of this approach is that it accounts for microvascular properties and extravascular forces that differ regionally and transmurally, as well as wave propagation effects in the conduit arteries. However, little validation of such models has been reported and no models of the newborn coronary circulation have been described. We therefore validated a multiscale model of the left coronary circulation using high-fidelity data from nine adult sheep and nine newborn lambs and investigated whether wave propagation effects are more prominent in adults, whose body size (and hence wave transit distance) is greater. The model consisted of a one-dimensional (1D) network of the major conduit arteries and a lumped parameter model of microvascular beds. Intramyocardial pressure was considered to arise via contraction-related myocyte thickening and transmission of ventricular cavity pressure into the heart wall. 1D network geometry from published human anatomical data was scaled using myocardial weights, while subject-specific aortic pressure/flow and ventricular pressure formed model inputs. Total vascular resistance was determined iteratively from measured mean circumflex coronary flow (CxQ), but no fitting of phasic aspects of the waveform was performed. Excellent agreement was obtained between simulated and measured CxQ waveforms in most cases. Detailed flow waveform analysis did not clearly reveal a greater prominence of wave propagation effects in adults compared with newborns. This multiscale model is likely to be useful for investigating wave phenomena and phasic aspects of coronary flow in adults and during development.
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Affiliation(s)
- Jonathan P Mynard
- Heart Research Group, Murdoch Childrens Research Institute, Parkville, Victoria, Australia
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Choy JS, Lu X, Yang J, Zhang ZD, Kassab GS. Endothelial actin depolymerization mediates NADPH oxidase-superoxide production during flow reversal. Am J Physiol Heart Circ Physiol 2013; 306:H69-77. [PMID: 24186098 DOI: 10.1152/ajpheart.00402.2013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Slow moving blood flow and changes in flow direction, e.g., negative wall shear stress, can cause increased superoxide (O2(·-)) production in vascular endothelial cells. The mechanism by which shear stress increases O2(·-) production, however, is not well established. We tested the hypothesis that actin depolymerization, which occurs during flow reversal, mediates O2(·-) production in vascular endothelial cells via NADPH oxidase, and more specifically, the subunit p47(phox). Using a swine model, we created complete blood flow reversal in one carotid artery, while the contralateral vessel maintained forward blood flow as control. We measured actin depolymerization, NADPH oxidase activity, and reactive oxygen species (ROS) production in the presence of various inhibitors. Flow reversal was found to induce actin depolymerization and a 3.9 ± 1.0-fold increase in ROS production as compared with forward flow. NADPH oxidase activity was 1.4 ± 0.2 times higher in vessel segments subjected to reversed blood flow when measured by a direct enzyme assay. The NADPH oxidase subunits gp91(phox) (Nox2) and p47(phox) content in the vessels remained unchanged after 4 h of flow reversal. In contrast, p47(phox) phosphorylation was increased in vessels with reversed flow. The response caused by reversed flow was reduced by in vivo treatment with jasplakinolide, an actin stabilizer (only a 1.7 ± 0.3-fold increase). Apocynin (an antioxidant) prevented reversed flow-induced ROS production when the animals were treated in vivo. Cytochalasin D mimicked actin depolymerization in vitro and caused a 5.2 ± 3.0-fold increase in ROS production. These findings suggest that actin filaments play an important role in negative shear stress-induced ROS production by potentiating NADPH oxidase activity, and more specifically, the p47(phox) subunit in vascular endothelium.
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Affiliation(s)
- Jenny S Choy
- Department of Biomedical Engineering, Indiana University Purdue University Indianapolis, Indianapolis, Indiana
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Tadic M, Ivanovic B, Cuspidi C. Metabolic syndrome and right ventricle: an updated review. Eur J Intern Med 2013; 24:608-16. [PMID: 24001437 DOI: 10.1016/j.ejim.2013.08.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 08/06/2013] [Accepted: 08/07/2013] [Indexed: 12/19/2022]
Abstract
The cluster of metabolic and hemodynamic abnormalities which characterize the metabolic syndrome (MS) is responsible for subclinical cardiac and extra-cardiac damage such as left ventricular hypertrophy, diastolic dysfunction, carotid atherosclerosis and microalbuminuria. The development of different non-invasive imaging methods enabled a detail investigation of right ventricular structure and function, and revealed that right ventricular remodeling followed changes in the left ventricular structure and function in patients with arterial hypertension, diabetes or obesity. Previous investigations also reported that the coexistence of two components of the MS induced more significant cardiac remodeling than the presence of only one MS risk-factor. The relationship between different components of the MS (increased blood pressure, abdominal obesity, increased fasting glucose level and dyslipidemia) and right ventricular remodeling could be explained by several hemodynamic and non-hemodynamic mechanisms. However, the association between right ventricular remodeling and the MS has not been sufficiently investigated so far. The aim of this article was to review recent articles focusing on the association between metabolic syndrome components and the metabolic syndrome itself with impairments in right ventricular structure and function assessed by different imaging techniques.
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Affiliation(s)
- Marijana Tadic
- University Clinical Hospital Centre "Dr Dragisa Misovic", Heroja Milana Tepica 1, 11000 Belgrade, Serbia.
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Effects of local mechanical stimulation on coronary artery endothelial function and angiotensin II type 1 receptor in pressure or flow-overload. J Hypertens 2013; 31:720-9. [DOI: 10.1097/hjh.0b013e32835d6d2c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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