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Renin–angiotensin system

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https://www.readbyqxmd.com/read/29456983/the-role-of-mas-receptor-on-renal-hemodynamic-responses-to-angiotensin-1-7-in-both-irreversible-and-reversible-unilateral-ureteral-obstruction-rats
#1
Jalal Hassanshahi, Mehdi Nematbakhsh
Background: Unilateral ureteral obstruction (UUO) alters the expression of renin-angiotensin system (RAS) components and angiotensin 1-7 (Ang 1-7) as a main arm of RAS is affected by UUO. The role of Mas receptor antagonist (A779) was examined in renal hemodynamic responses to Ang 1-7 in 3-day UUO and UUO removal (RUUO) in rats. Materials and Methods: Forty-five male Wistar rats were randomly divided into three groups of sham operated, UUO, and RUUO, while each group was divided into two subgroups treated with vehicle or A779...
2018: Advanced Biomedical Research
https://www.readbyqxmd.com/read/29455241/cox-2-derived-pge-2-triggers-hyperplastic-renin-expression-and-hyperreninemia-in-aldosterone-synthase-deficient-mice
#2
Christian Karger, Katharina Machura, André Schneider, Christian Hugo, Vladimir T Todorov, Armin Kurtz
Pharmacological inhibition or genetic loss of function defects of the renin angiotensin aldosterone system (RAAS) causes compensatory renin cell hyperplasia and hyperreninemia. The triggers for the compensatory stimulation of renin synthesis and secretion in this situation may be multimodal. Since cyclooxygenase-2 (COX-2) expression in the macula densa is frequently increased in states of a defective RAAS, we have investigated a potential role of COX-2 and its derived prostaglandins for renin expression and secretion in aldosterone synthase-deficient mice (AS-/- ) as a model for a genetic defect of the RAAS...
February 17, 2018: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29450812/renin-angiotensin-system-and-its-role-in-biomarkers-and-treatment-in-gliomas
#3
REVIEW
Alexander Perdomo-Pantoja, Sonia Iliana Mejía-Pérez, Liliana Gómez-Flores-Ramos, Montserrat Lara-Velazquez, Cordelia Orillac, Juan Luis Gómez-Amador, Talia Wegman-Ostrosky
Gliomas are the most common primary intrinsic tumor in the brain and are classified as low- or high-grade according to the World Health Organization (WHO). Patients with high-grade gliomas (HGG) who undergo surgical resection with adjuvant therapy have a mean overall survival of 15 months and 100% recurrence. The renin-angiotensin system (RAS), the primary regulator of cardiovascular circulation, exhibits local action and works as a paracrine system. In the context of this local regulation, the expression of RAS peptides and receptors has been detected in different kinds of tumors, including gliomas...
February 16, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29449503/early-renin-angiotensin-system-blockade-improved-short-term-and-longterm-renal-outcomes-in-systemic-lupus-erythematosus-patients-with-antiphospholipid-associated-nephropathy
#4
Cai Yue, Guanhong Li, Yubing Wen, Xuemei Li, Ruitong Gao
OBJECTIVE: To investigate the renal protective effects of early renin-angiotensin-aldosterone system (RAAS) blockade with renin-angiotensin system inhibitors (RASI) in systemic lupus erythematosus (SLE) patients with antiphospholipid-associated nephropathy (aPLN). METHODS: Medical data of 57 SLE patients with biopsy-proven aPLN were analyzed. Early RAAS blockade was defined as administration of RASI within 3 months after kidney biopsy and continued for ≥ 12 months...
February 15, 2018: Journal of Rheumatology
https://www.readbyqxmd.com/read/29449364/diabetic-cardiomyopathy-an-update-of-mechanisms-contributing-to-this-clinical-entity
#5
REVIEW
Guanghong Jia, Michael A Hill, James R Sowers
Heart failure and related morbidity and mortality are increasing at an alarming rate, in large part, because of increases in aging, obesity, and diabetes mellitus. The clinical outcomes associated with heart failure are considerably worse for patients with diabetes mellitus than for those without diabetes mellitus. In people with diabetes mellitus, the presence of myocardial dysfunction in the absence of overt clinical coronary artery disease, valvular disease, and other conventional cardiovascular risk factors, such as hypertension and dyslipidemia, has led to the descriptive terminology, diabetic cardiomyopathy...
February 16, 2018: Circulation Research
https://www.readbyqxmd.com/read/29446730/salvaging-the-ischemic-heart-gi-coupled-receptors-in-mast-cells-activate-a-pkc%C3%AF-aldh2-pathway-providing-anti-ras-cardioprotection
#6
Alice Marino, Roberto Levi
BACKGROUND: Excessive norepinephrine (NE) release in the ischemic heart elicits severe and often lethal arrhythmias. Resident cardiac mast cells synthesize and store active renin, which is released upon degranulation, causing the activation of a local cardiac renin-angiotensin system (RAS) responsible for NE release and consequent arrhythmias. Toxic aldehydes, known to be formed by lipid peroxidation in ischemia/reperfusion (I/R), have been shown to degranulate mast cells and activate a local RAS...
February 13, 2018: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/29446722/herbal-compounds-with-special-reference-to-gastrodin-as-potential-therapeutic-agents-for-microglia-mediated-neuroin%C3%AF-ammation
#7
Juan-Juan Li, Shun-Jin Liu, Xiao-Yu Liu, Eng-Ang Ling
BACKGROUND: Activated microglia play a pivotal role neurodegenerative diseases by producing a variety of proinflammatory mediators including tumor necrosis factor-alpha (TNF-α), interleukin-1bea (IL-1β) and nitric oxide (NO) that are toxic to neurons and oligodendrocytes. METHODS: In view of the above, suppression of microglia mediated neuroinflammation is deemed a therapeutic strategy for neurodegenerative diseases. Several potential Chinese herbal extracts have been reported to exert neuroprotective effects against neurodegenerative diseases targeting specifically at the activated microglia...
February 14, 2018: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/29446707/arsenic-cadmium-and-mercury-induced-hypertension-mechanisms-and-epidemiological-findings
#8
Airton da Cunha Martins, Maria Fernanda Hornos Carneiro, Denise Grotto, Joseph A Adeyemi, Fernando Barbosa
Arsenic (As), cadmium (Cd), and mercury (Hg) are toxic elements widely distributed in the environment. Exposure to these elements was attributed to produce several acute and chronic illnesses including hypertension. The aim of this review is to provide a summary of the most frequently proposed mechanisms underlying hypertension associated with As, Cd, and Hg exposure including: oxidative stress, impaired nitric oxide (NO) signaling, modified vascular response to neurotransmitters and disturbed vascular muscle Ca 2+ signaling, renal damage, and interference with the renin-angiotensin system...
February 15, 2018: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/29445908/gender-differences-in-epidemiology-pathophysiology-and-treatment-of-hypertension
#9
REVIEW
Paolo Di Giosia, Paolo Giorgini, Cosimo Andrea Stamerra, Marco Petrarca, Claudio Ferri, Amirhossein Sahebkar
PURPOSE OF REVIEW: This review aims to examine gender differences in both the epidemiology and pathophysiology of hypertension and to explore gender peculiarities on the effects of antihypertensive agents in decreasing BP and CV events. RECENT FINDINGS: Men and women differ in prevalence, awareness, and control rate of hypertension in an age-dependent manner. Studies suggest that sex hormones changes play a pivotal role in the pathophysiology of hypertension in postmenopausal women...
February 14, 2018: Current Atherosclerosis Reports
https://www.readbyqxmd.com/read/29445185/iron-overload-accelerates-the-progression-of-diabetic-retinopathy-in-association-with-increased-retinal-renin-expression
#10
Kapil Chaudhary, Wanwisa Promsote, Sudha Ananth, Rajalakshmi Veeranan-Karmegam, Amany Tawfik, Pachiappan Arjunan, Pamela Martin, Sylvia B Smith, Muthusamy Thangaraju, Oleg Kisselev, Vadivel Ganapathy, Jaya P Gnana-Prakasam
Diabetic retinopathy (DR) is a leading cause of blindness among working-age adults. Increased iron accumulation is associated with several degenerative diseases. However, there are no reports on the status of retinal iron or its implications in the pathogenesis of DR. In the present study, we found that retinas of type-1 and type-2 mouse models of diabetes have increased iron accumulation compared to non-diabetic retinas. We found similar iron accumulation in postmortem retinal samples from human diabetic patients...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29442523/patterns-of-heart-failure-symptoms-are-associated-with-self-care-behaviors-over-6-months
#11
Jonathan P Auld, James O Mudd, Jill M Gelow, Karen S Lyons, Shirin O Hiatt, Christopher S Lee
BACKGROUND: Both heart failure symptoms and self-care are associated with patient outcomes. Although it is thought that symptoms drive self-care, there is limited evidence to support this assumption over time. AIMS: To determine whether patterns of physical symptoms are significantly associated with heart failure self-care over time. METHOD: Latent mixture analysis was used to identify subgroups based on physical symptoms of dyspnea, sleepiness and edema (using the heart failure somatic perception and Epworth sleepiness scales)...
February 1, 2018: European Journal of Cardiovascular Nursing
https://www.readbyqxmd.com/read/29440218/impact-of-renin-angiotensin-system-inhibitors-on-clinical-outcomes-and-ventricular-remodelling-after-transcatheter-aortic-valve-implantation-rationale-and-design-of-the-rastavi-randomised-multicentre-study
#12
Ignacio J Amat-Santos, Pablo Catalá, Felipe Diez Del Hoyo, Jose A Fernandez-Diaz, Juan H Alonso-Briales, María Del Trigo, Ander Regueiro, Pablo Juan-Salvadores, Vicenç Serra, Enrique Gutierrez-Ibanes, Antonio J Muñoz-García, Luis Nombela-Franco, Manel Sabate, Victor A Jimenez-Diaz, Bruno García Del Blanco, Javier López, Luis H Varela-Falcón, Teresa Sevilla, Roman Arnold, Ana Revilla, J Alberto San Roman
INTRODUCTION: Transcatheter aortic valve implantation (TAVI) as a treatment in severe aortic stenosis (AS) is an excellent alternative to conventional surgical replacement. However, long-term outcomes are not benign. Renin-angiotensin system (RAS) blockade has shown benefit in terms of adverse remodelling in severe AS and after surgical replacement. METHODS AND ANALYSIS: The RAS blockade after TAVI (RASTAVI) trial aims to detect if there is a benefit in clinical outcomes and ventricular remodelling with this therapeutic strategy following the TAVI procedure...
February 13, 2018: BMJ Open
https://www.readbyqxmd.com/read/29438980/trimethoprim-use-for-urinary-tract-infection-and-risk-of-adverse-outcomes-in-older-patients-cohort-study
#13
Elizabeth Crellin, Kathryn E Mansfield, Clémence Leyrat, Dorothea Nitsch, Ian J Douglas, Adrian Root, Elizabeth Williamson, Liam Smeeth, Laurie A Tomlinson
OBJECTIVE: To determine if trimethoprim use for urinary tract infection (UTI) is associated with an increased risk of acute kidney injury, hyperkalaemia, or sudden death in the general population. DESIGN: Cohort study. SETTING: UK electronic primary care records from practices contributing to the Clinical Practice Research Datalink linked to the Hospital Episode Statistics database. PARTICIPANTS: Adults aged 65 and over with a prescription for trimethoprim, amoxicillin, cefalexin, ciprofloxacin, or nitrofurantoin prescribed up to three days after a primary care diagnosis of UTI between April 1997 and September 2015...
February 9, 2018: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/29436482/the-angiotensin-type-2-receptor-in-%C3%A2-human-adrenocortical-zona-glomerulosa-and-in-aldosterone-producing-adenoma-low-expression-and-no-functional-role
#14
Paul Emmanuel Vanderriele, Brasilina Caroccia, Teresa Maria Seccia, Maria Piazza, Livia Lenzini, Francesca Torresan, Maurizio Iacobone, Thomas Unger, Gian Paolo Rossi
The angiotensin II type 2 receptor (AT2R) and the angiotensin-(1-7) receptor (MasR) play a cardiovascular protective role by counter-regulating angiotensin II type 1 receptor (AT1R)-mediated effects, but whether this involves blunting of adrenocortical hormone secretion is unknown. We investigated the presence of AT1R, AT2R and MasR in aldosterone-producing adenoma (APA), a condition featuring hyperaldosteronism, and in APA-adjacent tissue. The effect of C21, an AT2R agonist, on CYP11B1 (cortisol synthase) and CYP11B2 (aldosterone synthase) gene expression in NCI-H295R and HAC15 cell lines, and in APA and APA-adjacent tissue was also assessed using the AT1R antagonist irbesartan to ascertain the specificity of C21 effect...
February 7, 2018: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29436384/increasing-mortality-in-adults-with-diabetes-and-low-estimated-glomerular-filtration-rate-in-the-absence-of-albuminuria
#15
Holly Kramer, Robert E Boucher, David Leehey, Linda Fried, Guo Wei, Tom Greene, Sylvia E Rosas, Richard Cooper, Guichan Cao, Srinivasan Beddhu
OBJECTIVE: Improved blood pressure control and use of renin-angiotensin-aldosterone system blockers has altered the clinical presentation or phenotype of chronic kidney disease (CKD) in U.S. adults with diabetes. These changes may influence mortality. RESEARCH DESIGN AND METHODS: Data from the National Health and Nutrition Examination Surveys (NHANES) 1988-2006 were used to examine mortality trends in adults with diabetes, defined as physician diagnosis, fasting glucose ≥126 mg/dL, hemoglobin A 1c >6...
February 7, 2018: Diabetes Care
https://www.readbyqxmd.com/read/29434591/angiotensin-1-7-promotes-resolution-of-eosinophilic-inflammation-in-an-experimental-model-of-asthma
#16
Giselle S Magalhaes, Lívia C Barroso, Alesandra C Reis, Maria G Rodrigues-Machado, Juliana F Gregório, Daisy Motta-Santos, Aline C Oliveira, Denise A Perez, Lucíola S Barcelos, Mauro M Teixeira, Robson A S Santos, Vanessa Pinho, Maria Jose Campagnole-Santos
Defective apoptosis of eosinophils, the main leukocyte in the pathogenesis of asthma, and delay in its removal lead to lung damage and loss of pulmonary function due to failure in the resolution of inflammation. Here, we investigated the ability of angiotensin-(1-7) [Ang-(1-7)], a pivotal peptide of the renin-angiotensin system, to promote resolution of an allergic lung inflammatory response. Balb/c mice were sensitized and challenged with ovalbumin and treated with Ang-(1-7) at the peak of the inflammatory process...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29433578/resistant-hypertension-on-treatment-reshypot-sequential-nephron-blockade-compared-to-dual-blockade-of-the-renin-angiotensin-aldosterone-system-plus-bisoprolol-in-the-treatment-of-resistant-arterial-hypertension-study-protocol-for-a-randomized-controlled-trial
#17
Elizabeth do Espirito Santo Cestário, Letícia Aparecida Barufi Fernandes, Luiz Tadeu Giollo-Júnior, Jéssica Rodrigues Roma Uyemura, Camila Suemi Sato Matarucco, Manoel Idelfonso Paz Landim, Luciana Neves Cosenso-Martin, Lúcia Helena Bonalume Tácito, Heitor Moreno, José Fernando Vilela-Martin, Juan Carlos Yugar-Toledo
BACKGROUND: Resistant hypertension is characterized when the blood pressure (BP) remains above the recommended goal after taking three antihypertensive drugs with synergistic actions at their maximum recommended tolerated doses, preferably including a diuretic. Identifying the contribution of intravascular volume and serum renin in maintaining BP levels could help tailor more effective hypertension treatment, whether acting on the control of intravascular volume or sodium balance, or acting on the effects of the renin-angiotensin-aldosterone system (RAAS) on the kidney...
February 12, 2018: Trials
https://www.readbyqxmd.com/read/29432709/neprilysin-inhibition-and-endothelin-1-elevation-focus-on-the-kidney
#18
Lodi C W Roksnoer, Estrellita Uijl, René de Vries, Ingrid M Garrelds, A H Jan Danser
Increasing the degree of renin-angiotensin system (RAS) blockade by combining ≥2 RAS blockers marginally increases efficacy, but results in more side effects. Hence, interference with other systems is currently being investigated, like potentiation of natriuretic peptides with neprilysin inhibitors. However, the neprilysin inhibitor thiorphan was recently found to increase endothelin-1 when administered to TGR(mREN2)27 (Ren2) rats on top of RAS blockade. Here we investigated whether this effect is thiorphan-specific, by comparing the neprilysin inhibitors thiorphan and sacubitril, administered by osmotic minipumps at a low or high dose for 7 days, in Ren2 rats...
February 9, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29432515/urinary-angiotensinogen-excretion-level-is-associated-with-elevated-blood-pressure-in-the-normotensive-general-population
#19
Emiko Sato, An Yi Wang, Michihiro Satoh, Yoko Nishikiori, Ikuko Oba-Yabana, Mai Yoshida, Hiroshi Sato, Sadayoshi Ito, Wataru Hida, Takefumi Mori
Background: Inflammation, intrarenal renin-angiotensin system activation, oxidative stress, and carbonyl stress have been postulated to play a fundamental role in controlling blood pressure. However, little is known about the association among renal renin-angiotensin system activation, carbonyl stress, and blood pressure elevation. Methods: We evaluated the relationship between blood pressure elevation and either renal renin-angiotensin system activity or carbonyl stress in the general population (N=355) in Japan...
February 8, 2018: American Journal of Hypertension
https://www.readbyqxmd.com/read/29431106/beneficial-effect-of-mas-receptor-deficiency-on-vascular-cognitive-impairment-in-the-presence-of-angiotensin-ii-type-2-receptor
#20
Akinori Higaki, Masaki Mogi, Jun Iwanami, Li-Juan Min, Hui-Yu Bai, Bao-Shuai Shan, Masayoshi Kukida, Toshifumi Yamauchi, Kana Tsukuda, Harumi Kan-No, Shuntaro Ikeda, Jitsuo Higaki, Masatsugu Horiuchi
BACKGROUND: The classical renin-angiotensin system is known as the angiotensin (Ang)-converting enzyme/Ang II/Ang type 1 receptor axis, which induces various organ damage including cognitive decline. The angiotensin-converting enzyme 2/Ang-(1-7)/Mas axis is known to exert antagonistic actions against the classical renin-angiotensin system axis in the cardiovascular system. However, its roles in the brain remain unclear. We examined possible roles of the angiotensin-converting enzyme 2/Ang-(1-7)/Mas axis in cognitive function, employing vascular cognitive impairment model mice...
February 3, 2018: Journal of the American Heart Association
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