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Angiotensin II

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https://www.readbyqxmd.com/read/28211883/the-inflammatory-state-provokes-sexual-dimorphism-in-left-ventricular-and-electrocardiographic-effects-of-chronic-cyclosporine-in-rats
#1
Hany M El-Bassossy, Zainy M Banjar, Mahmoud M El-Mas
Although cardiotoxicity has been recognized as an adverse effect of cyclosporine A (CSA), no information exists regarding sex specificity of CSA cardiotoxicity. We tested the hypothesis that left ventricular (LV) and electrocardiographic (ECG) effects of CSA and related inflammatory/histopathological derangements are sex related. CSA reduced the LV slope of end-systolic pressure volume relationship and increased isovolumic relaxation constant. These effects were more pronounced in male compared to female rats, suggesting LV systolic and diastolic dysfunction...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211642/biomechanical-strain-exacerbates-inflammation-on-a-progeria-on-a-chip-model
#2
João Ribas, Yu Shrike Zhang, Patrícia R Pitrez, Jeroen Leijten, Mario Miscuglio, Jeroen Rouwkema, Mehmet Remzi Dokmeci, Xavier Nissan, Lino Ferreira, Ali Khademhosseini
Organ-on-a-chip platforms seek to recapitulate the complex microenvironment of human organs using miniaturized microfluidic devices. Besides modeling healthy organs, these devices have been used to model diseases, yielding new insights into pathophysiology. Hutchinson-Gilford progeria syndrome (HGPS) is a premature aging disease showing accelerated vascular aging, leading to the death of patients due to cardiovascular diseases. HGPS targets primarily vascular cells, which reside in mechanically active tissues...
February 17, 2017: Small
https://www.readbyqxmd.com/read/28210753/puerarin-7-o-glucuronide-a-water-soluble-puerarin-metabolite-prevents-angiotensin-ii-induced-cardiomyocyte-hypertrophy-by-reducing-oxidative-stress
#3
Ning Hou, Bin Cai, Cai-Wen Ou, Zhen-Hui Zhang, Xia-Wen Liu, Mu Yuan, Gan-Jian Zhao, Shi-Ming Liu, Long-Gen Xiong, Jian-Dong Luo, Cheng-Feng Luo, Min-Sheng Chen
This study aimed to investigate the anti-oxidant and anti-hypertrophic effects of puerarin-7-O-glucuronide, a water-soluble puerarin metabolite. The anti-oxidant effects of puerarin-7-O-glucuronide were assessed by measurement of intracellular superoxide levels, total superoxide dismutase (SOD) activity, total anti-oxidant capacity, and glutathione (GSH)/glutathione disulfide (GSSG) ratio in cultured neonatal rat cardiomyocytes (NRCMs) stimulated with the xanthine oxidase (XO)/xanthine (X) system or angiotensin II...
February 16, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28210225/increased-apoptosis-in-the-paraventricular-nucleus-mediated-by-at1r-ras-erk1-2-signaling-results-in-sympathetic-hyperactivity-and-renovascular-hypertension-in-rats-after-kidney-injury
#4
Hongguo Zhu, Lishan Tan, Yumin Li, Jiawen Li, Minzi Qiu, Lanying Li, Mengbi Zhang, Min Liang, Aiqing Li
Background: The central nervous system plays a vital role in the development of hypertension, but the molecular regulatory mechanisms are not fully understood. This study aimed to explore signaling in the paraventricular nucleus (PVN) which might contribute to renal hypertension. Methods: Renal hypertension model was established by five-sixth nephrectomy operation (5/6Nx) in male Sprague Dawley rats. Ten weeks afterwards, they were random assigned to no treatment, or intracerebroventricular injection (ICV) with artificial cerebrospinal fluid, losartan [angiotensin II receptor type 1 (AT1R) antagonist], farnesylthiosalicylic acid (Ras inhibitor), PD98059 (MEK inhibitor), or SB203580 (p38 inhibitor) and Z-DEVD-FMK (caspase-3 inhibitor)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28209920/effect-of-captopril-on-radiation-induced-tgf-%C3%AE-1-secretion-in-ea-hy926-human-umbilical-vein-endothelial-cells
#5
Jingni Wei, Hui Xu, Yinyin Liu, Baiyu Li, Fuxiang Zhou
The pathophysiological mechanism involved in the sustained endothelial secretion of cytokines that leads to fibrosis 6-16 months after radiotherapy remains unclear. Angiotensin II (Ang II) is produced by the endothelium in response to stressing stimuli, like radiation, and may induce the synthesis of TGF-β, a profibrotic cytokine. In this study we tested the hypothesis that captopril, an angiotensin-converting enzyme (ACE) inhibitor, inhibits or attenuates radiation-induced endothelial TGF-β1 secretion. The human endothelial hybrid cell line EA...
February 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28209222/roles-of-angiotensin-peptides-and-recombinant-human-ace2-in-heart-failure
#6
Ratnadeep Basu, Marko Poglitsch, Haran Yogasundaram, Jissy Thomas, Brian H Rowe, Gavin Y Oudit
BACKGROUND: The renin-angiotensin system (RAS) is activated in heart failure (HF) and inhibition of RAS is a mainstay therapy for HF. Angiotensin-converting enzyme 2 (ACE2) and its product, angiotensin 1-7 (Ang-[1-7]), are important negative regulators of the RAS. OBJECTIVES: A comprehensive examination of angiotensin peptide levels and therapeutic effects of recombinant human ACE2 (rhACE2) on peptide metabolism was evaluated in human plasma and explanted heart tissue from patients with HF...
February 21, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28207324/is-serum-angiotensin-converting-enzyme-level-useful-for-determining-necroinflammatory-activity-in-chronic-hepatitis-b-infection
#7
Ahmet Tay, Fatih Albayrak, Sevilay Ozmen, Ayse Albayrak, Kemalettin Ozden
AIM: The purpose of this study was to investigate the relationship between the findings from liver biopsy and the serum angiotensin-converting enzyme (ACE) level to determine whether ACE might serve as a potential noninvasive sign of necroinflammatory activity in patients with Chronic Hepatitis B (CHB) infection. METHODS: A total of 54 CHB patients referred for liver biopsy were enrolled in the study. Serum ACE levels were determined photometrically with a kinetic test...
February 2017: Genetic Testing and Molecular Biomarkers
https://www.readbyqxmd.com/read/28207279/angiotensin-converting-inhibitors-and-angiotensin-ii-receptor-blockers-and-longitudinal-change-in-percent-emphysema-on-computed-tomography-the-mesa-lung-study
#8
Megha A Parikh, Carrie P Aaron, Eric A Hoffman, Joseph E Schwartz, Jaime Madrigano, John H M Austin, Ravi Kalhan, Gina Lovasi, Karol Watson, Karen Hinckley Stukovsky, R Graham Barr
RATIONALE: Chronic obstructive pulmonary disease (COPD) is the third-leading cause of death in the United States. Emphysema on computed tomography (CT) is associated with increased morbidity and mortality in patients with and without spirometrically defined COPD but no available medications target emphysema.  Transforming growth factor beta (TGF-β) and endothelial dysfunction are implicated in emphysema pathogenesis, and angiotensin II receptor blockers (ARB) inhibit TGF-β, improve endothelial function and restore airspace architecture in murine models...
February 16, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28205588/hypoxia-induced-angiotensin-ii-by-the-lactate-chymase-dependent-mechanism-mediates-radioresistance-of-hypoxic-tumor-cells
#9
Guozhu Xie, Ying Liu, Qiwei Yao, Rong Zheng, Lanfang Zhang, Jie Lin, Zhaoze Guo, Shasha Du, Chen Ren, Quan Yuan, Yawei Yuan
The renin-angiotensin system (RAS) is a principal determinant of arterial blood pressure and fluid and electrolyte balance. RAS component dysregulation was recently found in some malignancies and correlated with poor patient outcomes. However, the exact mechanism of local RAS activation in tumors is still unclear. Here, we find that the local angiotensin II predominantly exists in the hypoxic regions of tumor formed by nasopharyngeal carcinoma CNE2 cells and breast cancer MDA-MB-231 cells, where these tumor cells autocrinely produce angiotensin II by a chymase-dependent rather than an angiotensin converting enzyme-dependent mechanism...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28204818/reactive-oxygen-species-mediate-angiotensin-ii-induced-transcytosis-of-low-density-lipoprotein-across-endothelial-cells
#10
Fang Bian, Jun Cui, Tao Zheng, Si Jin
The retention of plasma low-density lipoprotein (LDL) particles to subendothelial spaces through transcytosis across the endothelium is the initial step of atherosclerosis (AS). Angiotensin II (Ang II), as the principal effector molecule of the renin-angiotensin system (RAS), is implicated in several important steps of AS development. However, whether or not Ang II can directly exert a pro‑atherogenic effect by promoting LDL transcytosis across endothelial barriers, has not been defined. In the present study, we found that Ang II upregulated intracellular reactive oxygen species (ROS) levels in endothelial cells (ECs) by measuring fluorescence of 2',7'-dichlorofluorescein (DCF‑DA)...
February 13, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28203527/superoxide-increases-angiotensin-ii-at1-receptor-function-in-human-kidney-2-cells
#11
Mohammad Saleem, Indira Pokkunuri, Mohammad Asghar
The redox-sensitive Sp family transcription factor has been linked to the regulation of angiotensin II type 1 receptor (AT1R). However, the exact mechanism of AT1R regulation in renal cells is poorly understood. We tested the specificity of reactive oxygen species (ROS), superoxide vs. hydrogen peroxide (H2O2), and the specific role of Sp3 transcription factor, if any, in the regulation of AT1R in human kidney cells (HK2 cells). Superoxide dismutase (SOD) inhibitor diethyldithiocarbamate (DETC), but not H2O2 treatment, increased fluorescence levels of superoxide probe dihydroethidium (DHE)...
December 2016: FEBS Open Bio
https://www.readbyqxmd.com/read/28202497/deficiency-of-the-angiotensinase-aminopeptidase-a-increases-susceptibility-to-glomerular-injury
#12
Juan Carlos Q Velez, Ehtesham Arif, Jessalyn Rodgers, Megan P Hicks, John M Arthur, Deepak Nihalani, Evelyn T Bruner, Milos N Budisavljevic, Carl Atkinson, Wayne R Fitzgibbon, Michael G Janech
Aminopeptidase A (APA) is expressed in glomerular podocytes and tubular epithelia and metabolizes angiotensin II (AngII), a peptide known to promote glomerulosclerosis. In this study, we tested whether APA expression changes in response to progressive nephron loss or whether APA exerts a protective role against glomerular damage and during AngII-mediated hypertensive kidney injury. At advanced stages of FSGS, fawn-hooded hypertensive rat kidneys exhibited distinctly increased APA staining in areas of intact glomerular capillary loops...
February 15, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28199380/the-effects-of-pravastatin-on-the-normal-human-placenta-lessons-from-ex-vivo-models
#13
Adelina Balan, Irit Szaingurten-Solodkin, Shani S Swissa, Valeria Feinshtein, Mahmoud Huleihel, Gershon Holcberg, Doron Dukler, Ofer Beharier
INTRODUCTION: Research in animal models and preliminary clinical studies in humans support the use of pravastatin for the prevention of preeclampsia. However, its use during pregnancy is still controversial due to limited data about its effect on the human placenta and fetus. METHODS: In the present study, human placental cotyledons were perfused in the absence or presence of pravastatin in the maternal reservoir (PraM). In addition, placental explants were treated with pravastatin for 5, 24 and 72 h under normoxia and hypoxia...
2017: PloS One
https://www.readbyqxmd.com/read/28198439/miat-is-a-pro-fibrotic-long-non-coding-rna-governing-cardiac-fibrosis-in-post-infarct-myocardium
#14
Xuefeng Qu, Yue Du, You Shu, Ming Gao, Fei Sun, Shenjian Luo, Ti Yang, Linfeng Zhan, Yin Yuan, Wenfeng Chu, Zhenwei Pan, Zhiguo Wang, Baofeng Yang, Yanjie Lu
A long non-coding RNA (lncRNA), named myocardial infarction associated transcript (MIAT), has been documented to confer risk of myocardial infarction (MI). The aim of this study is to elucidate the pathophysiological role of MIAT in regulation of cardiac fibrosis. In a mouse model of MI, we found that MIAT was remarkably up-regulated, which was accompanied by cardiac interstitial fibrosis. MIAT up-regulation in MI was accompanied by deregulation of some fibrosis-related regulators: down-regulation of miR-24 and up-regulation of Furin and TGF-β1...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28196918/m1-macrophages-are-required-for-murine-cerebral-aneurysm-formation
#15
Kamil W Nowicki, Koji Hosaka, Frank J Walch, Edward W Scott, Brian L Hoh
INTRODUCTION: Macrophages and neutrophils have been separately implicated in cerebral aneurysm formation. The interactions between different myeloid subsets and the contributions of macrophage phenotypes in these lesions over time are not known. The purpose of the study was to examine macrophage phenotypic changes in cerebral aneurysms. METHODS: We induced aneurysm formation in C57BL/6 mice and quantified contributions of M1 and M2 macrophages in aneurysm specimens with or without neutrophil blockade...
February 14, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28196857/deletion-of-hypoxia-inducible-factor-1%C3%AE-in-myeloid-lineage-exaggerates-angiotensin-ii-induced-formation-of-abdominal-aortic-aneurysm
#16
Yusuke Takahara, Tomotake Tokunou, Hiroshi Kojima, Yoshitaka Hirooka, Toshihiro Ichiki
Hypoxia-inducible factor (HIF)-1α is a transcription factor that regulates various genes responding to hypoxic conditions. We previously reported that myeloid-specific activation of HIF-1α had protective effects on hypertensive cardiovascular remodeling in mice. However the role of myeloid lineage HIF-1α in the development of abdominal aortic aneurysm (AAA) has not been determined. Myeloid-specific HIF-1α knockout (HIF-1KO) mice were created using a Cre-lox recombination system in the background of apolipoprotein E-deficient mice...
February 14, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28196432/association-of-seven-renin-angiotensin-system-gene-polymorphisms-with-restenosis-in-patients-following-coronary-stenting
#17
Min Zhu, Minjun Yang, Jiangbo Lin, Huanhuan Zhu, Yifei Lu, Bing Wang, Yinshen Xue, Congfeng Fang, Lijiang Tang, Baohui Xu, Jianjun Jiang, Xiaofeng Chen
BACKGROUND AND OBJECTIVE: Percutaneous coronary intervention, despite being effective for coronary revascularization, causes in-stent restenosis due to neointimal hyperplasia in a large number of patients. The renin-angiotensin system is involved in neointimal hyperplasia. This study sought to evaluate seven gene polymorphisms of key renin-angiotensin system components, including angiotensinogen, angiotensin-converting enzyme and angiotensin II type 1a receptors, and their associations with in-stent restenosis in patients with coronary artery disease following coronary stenting...
January 2017: Journal of the Renin-angiotensin-aldosterone System: JRAAS
https://www.readbyqxmd.com/read/28195517/systematic-underutilisation-of-secondary-preventive-drugs-in-patients-with-acute-coronary-syndrome-and-reduced-renal-function
#18
Masih Khedri, Karolina Szummer, Juan-Jesus Carrero, Tomas Jernberg, Marie Evans, Stefan H Jacobson, Jonas Spaak
Aims The high risk of recurrent events in patients with reduced renal function following an acute coronary syndrome (ACS) may in part be due to suboptimal secondary prevention. We aimed to describe the association between renal dysfunction and the prescription, initiation and persistent use of secondary prevention during the first year after a first ACS. Methods We identified all patients admitted to any Swedish coronary care unit for a first ACS between 2005 and 2010 ( n = 77,432). In 75,129 patients, creatinine levels were available in order to obtain the estimated glomerular filtration rate (eGFR)...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28194981/droplet-assisted-inlet-ionization-for-online-analysis-of-airborne-nanoparticles
#19
Andrew J Horan, Michael J Apsokardu, Murray V Johnston
Airborne nanoparticles play a key role in climate effects as well as impacting human health. Their small mass and complex chemical composition represent significant challenges for analysis. This work introduces a new ionization method, droplet assisted inlet ionization (DAII), where aqueous droplets are produced from airborne nanoparticles. When these droplets enter the mass spectrometer through a heated inlet, rapid vaporization leads to the formation of molecular ions. The method is demonstrated with test aerosols consisting of polypropylene glycol (PPG), angiotensin II, bovine serum albumin, and the "thermometer" compound p-methoxybenzylpyridinium chloride...
January 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28194766/significance-of-ang-1-7-coupling-with-mas1-and-other-gpcrs-to-the-renin-angiotensin-system-iuphar-review-x
#20
REVIEW
Sadashiva S Karnik, Dhanachandra Khuraijam, Kalyan Tirupula, Hamiyet Unal
Angiotensins are a group of hormonal peptides including angiotensin II and angiotensin 1-7 produced by the renin angiotensin system. The biology, pharmacology and biochemistry of the receptors for angiotensins were extensively reviewed recently. In the review, the receptor nomenclature committee did not lay emphasis on designating MAS1 as the angiotensin 1-7 receptor on the basis of lack of classical G protein signaling and desensitization in response to angiotensin 1-7 as well as lack of consensus on confirmatory ligand pharmacological analyses...
February 14, 2017: British Journal of Pharmacology
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