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Renin–angiotensin system

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https://www.readbyqxmd.com/read/29057680/the-association-of-renin-angiotensinogen-system-genes-polymorphisms-and-idiopathic-recurrent-pregnancy-loss
#1
Mohammad Mehdi Heidari, Mozhgan Sheikholeslami, Mahdieh Yavari, Mehri Khatami, Seyed Mohammad Seyedhassani
The most common complication of pregnancy is idiopathic recurrent pregnancy loss (RPL). To identify the contribution of gene polymorphisms to this condition, we evaluated the association between RPL and the angiotensinogen (AGT), angiotensin receptor 1 (AGTR1) and Angiotensinogen converting enzyme (ACE). In this case-control study, the frequency of AGT (rs4762 and rs699), AGTR1 (rs5186) and ACE insertion/deletion (rs4340) polymorphisms in 202 idiopathic RPL women was compared with 210 women with no history of abortion, using tetra-primer ARMS-PCR...
October 23, 2017: Human Fertility: Journal of the British Fertility Society
https://www.readbyqxmd.com/read/29056948/association-of-cardiovascular-system-medications-with-cognitive-function-and-dementia-in-older-adults-living-in-nursing-homes-in-australia
#2
Enwu Liu, Suzanne M Dyer, Lisa Kouladjian O'Donnell, Rachel Milte, Clare Bradley, Stephanie L Harrison, Emmanuel Gnanamanickam, Craig Whitehead, Maria Crotty
OBJECTIVE: To examine associations between cardiovascular system medication use with cognition function and diagnosis of dementia in older adults living in nursing homes in Australia. METHODS: As part of a cross-sectional study of 17 Australian nursing homes examining quality of life and resource use, we examined the association between cognitive impairment and cardiovascular medication use (identified using the Anatomical Therapeutic Classification System) using general linear regression and logistic regression models...
June 2017: Journal of Geriatric Cardiology: JGC
https://www.readbyqxmd.com/read/29056916/inhibition-of-pro-renin-receptor-contributes-to-renoprotective-effects-of-angiotensin-ii-type-1-receptor-blockade-in-diabetic-nephropathy
#3
Lin Zhang, Xiao-Fei An, Xin Ruan, Dong-Dong Huang, Li Zhou, Hong Xue, Li-Min Lu, Ming He
Aims: Renal renin-angiotensin system (RAS) plays a pivotal role in the development of diabetic nephropathy (DN). Angiotensin II (Ang II) type 1 receptor (AT1R) blockade elevates (pro)renin, which may bind to (pro)renin receptor (PRR) and exert receptor-mediated, angiotensin-independent profibrotic effects. We therefore investigated whether PRR activation leads to the limited anti-fibrotic effects of AT1R blockade on DN, and whether PRR inhibition might ameliorate progression of DN. Methods: To address the issue, the expression of RAS components was tested in different stages of streptozotocin (STZ)-induced diabetic rats (6, 12, and 24 weeks) and 6-week AT1R blockade (losartan) treated diabetic rats...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29054562/exercise-attenuates-dexamethasone-induced-hypertensionthrough-an-improvement-of-baroreflex-activity-independently-of-the-renin-angiotensin-system
#4
Paula B Constantino, Thiago J Dionísio, Francine Duchatsch, Naiara A Herrera, Josiane O Duarte, Carlos F Santos, Carlos C Crestani, Sandra L Amaral
Dexamethasone-induced hypertension may be caused by baroreflex alterations or renin-angiotensin system (RAS) exacerbation. Aerobic training has been recommended for hypertension treatment, but the mechanisms responsible for reduction of arterial pressure (AP) in dexamethasone (DEX) treated rats are still inconclusive.This study evaluated whether mechanisms responsible for training-induced attenuation of hypertension involve changes in autonomic nervous system and in RAS components. Rats underwent aerobic training protocol on treadmill or were kept sedentary for 8 weeks...
October 17, 2017: Steroids
https://www.readbyqxmd.com/read/29053707/high-glucose-augments-angiotensinogen-in-human-renal-proximal-tubular-cells-through-hepatocyte-nuclear-factor-5
#5
Juan Wang, Yuki Shibayama, Hiroyuki Kobori, Ya Liu, Hideki Kobara, Tsutomu Masaki, Zhiyu Wang, Akira Nishiyama
High glucose has been demonstrated to induce angiotensinogen (AGT) synthesis in the renal proximal tubular cells (RPTCs) of rats, which may further activate the intrarenal renin-angiotensin system (RAS) and contribute to diabetic nephropathy. This study aimed to investigate the effects of high glucose on AGT in the RPTCs of human origin and identify the glucose-responsive transcriptional factor(s) that bind(s) to the DNA sequences of AGT promoter in human RPTCs. Human kidney (HK)-2 cells were treated with normal glucose (5...
2017: PloS One
https://www.readbyqxmd.com/read/29051307/effect-of-renal-denervation-on-urine-angiotensinogen-excretion-in-prenatally-programmed-rats
#6
Asifhusen Mansuri, Susan K Legan, Jyoti Jain, Issa Alhamoud, Jyothsna Gattineni, Michel Baum
Prenatal programming results in an increase in blood pressure in adult offspring. We have shown that compared to control adult offspring whose mothers were fed a 20% protein diet, programmed adults whose mothers were fed a 6% protein diet during the last half of pregnancy have an increase in renal sympathetic nerve activity and urinary angiotensinogen/creatinine levels. We hypothesized that the increase in urinary angiotensinogen was mediated by renal sympathetic nerve activity in programmed rats. In this study performed in 3 month old rats, renal denervation resulted in normalization of blood pressure in the 6% programmed group (150 ± 3 Hg in 6% sham vs...
November 2017: Physiological Reports
https://www.readbyqxmd.com/read/29050747/soluble-pro-renin-receptor-in-preeclampsia-and-diabetic-pregnancies
#7
Meryam Sugulle, Harald Heidecke, Ulrike Maschke, Florian Herse, A H Jan Danser, Dominik N Mueller, Anne Cathrine Staff, Ralf Dechend
Women with preexisting or gestational diabetes mellitus have an increased risk for developing preeclampsia. Diabetes and pregnancy are both characterized by very high prorenin levels and renin-angiotensin system activation. Prorenin bound to the (pro)renin receptor has enzymatic activity. We hypothesized that soluble (pro)renin receptor levels are elevated in high-risk pregnancies. Third trimester maternal blood samples from complicated pregnancies (n = 165), (preeclampsia [n = 76], diabetes mellitus [type I diabetes, n = 35; type II diabetes, n = 11; gestational diabetes mellitus, n = 43]), and healthy pregnancies (n = 49) were analyzed for prorenin, renin, and soluble (pro)renin receptor...
October 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/29049981/angiotensin-receptor-blockade-improves-cardiac-mitochondrial-activity-in-response-to-an-acute-glucose-load-in-obese-insulin-resistant-rats
#8
Max Thorwald, Ruben Rodriguez, Andrew Lee, Bridget Martinez, Janos Peti-Peterdi, Daisuke Nakano, Akira Nishiyama, Rudy M Ortiz
Hyperglycemia increases the risk of oxidant overproduction in the heart through activation of a multitude of pathways. Oxidation of mitochondrial enzymes may impair their function resulting in accumulation of intermediates and reverse electron transfer, contributing to mitochondrial dysfunction. Furthermore, the renin-angiotensin system (RAS) becomes inappropriately activated during metabolic syndrome, increasing oxidant production. To combat excess oxidant production, the transcription factor, nuclear factor erythriod-2- related factor 2 (Nrf2), induces expression of many antioxidant genes...
October 7, 2017: Redox Biology
https://www.readbyqxmd.com/read/29048108/renin-angiotensin-system-blockade-promotes-a-cardio-renal-protection-in-albuminuric-homozygous-sickle-cell-patients
#9
Jean-Philippe Haymann, Nadjib Hammoudi, Katia Stankovic Stojanovic, Frederic Galacteros, Anoosha Habibi, Virginie Avellino, Pablo Bartolucci, Yahia Benzerara, Jean-Benoit Arlet, Morad Djebbar, Emmanuel Letavernier, Gilles Grateau, Nathalie Tabibzadeh, Alexei Girshovich, Michel Chaignon, Robert Girot, Pierre Levy, Francois Lionnet
The management of sickle cell nephropathy (SCN) at an early stage is an important issue to prevent renal and cardiovascular morbidity and mortality. This study aimed to evaluate in this population, whether angiotensin converting enzyme inhibitors (ACEIs) treatment could exert a cardio-renal protection in a SCN cohort. Forty-two SCN patients (urine albumin:creatinine ratio (ACR) > 10 mg/mmol) were treated with ACEIs for 6 months, then evaluated for ACR, measured glomerular filtration rate (mGFR) together with haematological and cardiovascular parameters...
October 19, 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/29046730/aliskiren-effect-on-non-alcoholic-steatohepatitis-in-metabolic-syndrome
#10
F N Ramalho, S C Sanches, M C Foss, M J Augusto, D M Silva, A M Oliveira, L N Ramalho
BACKGROUND: Non-alcoholic steatohepatitis (NASH) is highly associated with metabolic syndrome, a major cause of morbidity in the globalized society. The renin-angiotensin system (RAS) influences hepatic fatty acid metabolism, inflammation and fibrosis. Thus, in the present study, we aimed to evaluate the effect of aliskiren, a direct renin inhibitor, on metabolic syndrome-related NASH. METHODS: C57BL/6 male mice (n = 45) were divided into three groups: controls; animals inoculated with streptozotocin (STZ) (40 mg/kg/day) for 5 days and fed with high fat diet (HFD) for 8 weeks; and animals inoculated with STZ for 5 days, fed with HFD for 8 weeks and treated with aliskiren (100 mg/kg/day) for the final 2 weeks...
2017: Diabetology & Metabolic Syndrome
https://www.readbyqxmd.com/read/29046642/cooperative-oxygen-sensing-by-the-kidney-and-carotid-body-in-blood-pressure-control
#11
Daniela Patinha, Wioletta Pijacka, Julian F R Paton, Maarten P Koeners
Oxygen sensing mechanisms are vital for homeostasis and survival. When oxygen levels are too low (hypoxia), blood flow has to be increased, metabolism reduced, or a combination of both, to counteract tissue damage. These adjustments are regulated by local, humoral, or neural reflex mechanisms. The kidney and the carotid body are both directly sensitive to falls in the partial pressure of oxygen and trigger reflex adjustments and thus act as oxygen sensors. We hypothesize a cooperative oxygen sensing function by both the kidney and carotid body to ensure maintenance of whole body blood flow and tissue oxygen homeostasis...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29046315/sex-differences-in-maternal-gestational-hypertension-induced-sensitization-of-angiotensin-ii-hypertension-in-rat-offspring-the-protective-effect-of-estrogen
#12
Baojian Xue, Terry G Beltz, Fang Guo, Alan Kim Johnson
Recent studies demonstrate that maternal hypertension during pregnancy sensitizes an angiotensin (ANG) II-induced increase in blood pressure (BP) in adult male offspring that was associated with upregulation of mRNA expression of several renin-angiotensin-aldosterone system (RAAS) components and NADPH oxidase in the lamina terminalis (LT) and paraventricular nucleus (PVN). The purpose of the present study was to test whether there are sex differences in the maternal hypertension-induced sensitization of ANG II hypertension, and whether sex hormones are involved in the sensitization process...
October 18, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29045337/blood-pressure-regulation-by-the-angiotensin-type-1-receptor-in-the-proximal-tubule
#13
Marloes C van Haaster, Alicia A McDonough, Susan B Gurley
PURPOSE OF REVIEW: The renin-angiotensin system (RAS) plays a critical role in the pathogenesis of hypertension. Homeostatic actions of the RAS, such as increasing blood pressure (BP) and vasoconstriction, are mediated via type 1 (AT1) receptors for angiotensin II. All components of the RAS are present in the renal proximal tubule, which reabsorbs the bulk of the glomerular filtrate, making this segment of the nephron a location of great interest for solute handling under RAS influence...
October 16, 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/29045335/angiotensin-converting-enzyme-2-and-renal-disease
#14
Vanessa R Williams, James W Scholey
PURPOSE OF REVIEW: The renin-angiotensin system (RAS) is a pivotal player in the physiology and pathophysiology of cardiovascular and renal systems. Discovery of angiotensin-converting enzyme 2 (ACE2), capable of cleaving RAS effector peptide angiotensin (Ang) II into biologically active Ang-(1-7), has increased the complexity of our knowledge of the RAS. ACE2 expression is abundant in the kidney and is thought to provide protection against injury. This review emphasizes current experimental and clinical findings that examine ACE2 in the context of kidney injury and its potential therapeutic impact for treatment of kidney disease...
October 16, 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/29044123/ire1%C3%AE-xbp1s-branch-of-upr-links-hif1%C3%AE-activation-to-mediate-angii-dependent-endothelial-dysfunction-under-particulate-matter-pm-2-5-exposure
#15
Xiuduan Xu, Aodeng Qimuge, Hongli Wang, Chen Xing, Ye Gu, Shasha Liu, Huan Xu, Meiru Hu, Lun Song
Short- and long-term exposure to particulate matter (PM) 2.5 instigates adverse health effect upon the cardiovascular (CV) system. Disclosing the molecular events by which PM2.5 evokes CV injuries is essential in developing effective risk-reduction strategy. Here we found that rats after intratracheally instillation with PM2.5 displayed increased circulating level of ANGII, the major bioactive peptide in renin-angiotensin-system (RAS), which resulted from the elevation of ANGII production in the vascular endothelium...
October 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29042425/cardiovascular-and-metabolic-consequences-of-testosterone-supplements-in-young-and-old-male-spontaneously-hypertensive-rats-implications-for-testosterone-supplements-in-men
#16
Carolina Dalmasso, Chetan N Patil, Licy L Yanes Cardozo, Damian G Romero, Rodrigo O Maranon
BACKGROUND: The safety of testosterone supplements in men remains unclear. In the present study, we tested the hypothesis that in young and old male spontaneously hypertensive rats (SHR), long-term testosterone supplements increase blood pressure and that the mechanism is mediated in part by activation of the renin-angiotensin system. METHODS AND RESULTS: In untreated males, serum testosterone exhibited a sustained decrease after 5 months of age, reaching a nadir by 18 to 22 months of age...
October 17, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29042424/angiotensin-ii-receptor-neprilysin-inhibitor-sacubitril-valsartan-improves-endothelial-dysfunction-in-spontaneously-hypertensive-rats
#17
Takunori Seki, Kenichi Goto, Yasuo Kansui, Toshio Ohtsubo, Kiyoshi Matsumura, Takanari Kitazono
BACKGROUND: We have previously demonstrated that antihypertensive treatment with renin-angiotensin system inhibitors restores the impaired endothelium-dependent hyperpolarization (EDH)-mediated responses in spontaneously hypertensive rats (SHRs). Herein, we investigated whether the angiotensin II receptor-neprilysin inhibitor sacubitril/valsartan (LCZ696) would improve reduced EDH-mediated responses and whether LCZ696 would exert additional effects on endothelium-dependent and endothelium-independent vasorelaxation compared with an angiotensin II type 1 receptor blocker alone during hypertension...
October 17, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29039840/-use-of-loop-diuretics-in-heart-failure-current-aspects
#18
N V Kurlykina, E M Seredenina, Yа A Orlova
Loop diuretics take the lead in the treatment of patients with symptomatic heart failure. Torasemide is the most effective and safe loop diuretic with the optimal pharmacokinetic profile, the additional properties associated with simultaneous blockade of the renin-angiotensin-aldosterone system and with the antiadrenergic effects of the drug, its positive impact on myocardial fibrosis and minimal severe potential negative effects. Sustained-release torasemide provides a more comfortable removal of excess liquid and does not deteriorate quality of life...
2017: Terapevticheskiĭ Arkhiv
https://www.readbyqxmd.com/read/29036393/angiotensin-receptor-expression-and-vascular-endothelial-dysfunction-in-obstructive-sleep-apnea
#19
Rami N Khayat, Saradhadevi Varadharaj, Kyle Porter, Angela Sow, David Jarjoura, Mikhail A Gavrilin, Jay L Zweier
Background: Obstructive sleep apnea (OSA) is associated with vascular endothelial dysfunction (VED) in otherwise healthy patients. The role of renin-angiotensin system (RAS) in the OSA induced VED is not well understood. Methods: Recently diagnosed OSA patients with very low cardiovascular disease (CVD) risk (Framingham score <5%) were studied at diagnosis and after 12 weeks of verified continuous positive airway pressure (CPAP) therapy. Participants underwent biopsy of gluteal subcutaneous tissue at baseline and after CPAP...
September 27, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/29034589/involvement-of-local-renin-angiotensin-system-in-immunosuppression-of-tumor-microenvironment
#20
Kenta Nakamura, Tomonori Yaguchi, Gaku Ohmura, Asuka Kobayashi, Naoshi Kawamura, Takashi Iwata, Yukiko Kiniwa, Ryuhei Okuyama, Yutaka Kawakami
To improve the current cancer immunotherapies, strategies to modulate various immunosuppressive cells including myeloid derived suppressor cells (MDSCs) which were shown to be negative factors in the immune-checkpoint blockade therapy, need to be developed. In this study, we have evaluated the role of local renin-angiotensin system (RAS) in the tumor immune-microenvironment using murine models bearing tumor cell lines in which RAS was not involved in their proliferation and angiogenetic ability. Administration of angiotensin II receptor blockers (ARBs) to C57BL/6 mice bearing murine colon cancer cell line MC38 resulted in significant enhancement of tumor antigen gp70 specific T cells...
October 16, 2017: Cancer Science
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