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Renin Angiotensin System

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https://www.readbyqxmd.com/read/29168869/amentoflavone-improves-cardiovascular-dysfunction-and-metabolic-abnormalities-in-high-fructose-and-fat-diet-fed-rats
#1
Li Qin, Ying Zhao, Bin Zhang, Yan Li
Metabolic syndrome (MS) is a leading cause of mortality and morbidity in Western countries. Amentoflavone (AMF) is a polyphenolic compound which has been found to exhibit various biological activities. In this study, we investigated the protective effects of AMF against cardiovascular and liver dysfunction in high fructose and fat diet (HFFD)-induced MS rats. AMF could evidently inhibit the changes of general metabolic parameters, including body weight, fat mass, insulin level, and glucose tolerance activity...
November 23, 2017: Food & Function
https://www.readbyqxmd.com/read/29168475/chronic-kidney-disease
#2
REVIEW
Paola Romagnani, Giuseppe Remuzzi, Richard Glassock, Adeera Levin, Kitty J Jager, Marcello Tonelli, Ziad Massy, Christoph Wanner, Hans-Joachim Anders
Chronic kidney disease (CKD) is defined by persistent urine abnormalities, structural abnormalities or impaired excretory renal function suggestive of a loss of functional nephrons. The majority of patients with CKD are at risk of accelerated cardiovascular disease and death. For those who progress to end-stage renal disease, the limited accessibility to renal replacement therapy is a problem in many parts of the world. Risk factors for the development and progression of CKD include low nephron number at birth, nephron loss due to increasing age and acute or chronic kidney injuries caused by toxic exposures or diseases (for example, obesity and type 2 diabetes mellitus)...
November 23, 2017: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/29167166/blood-borne-interleukin-1%C3%AE-acts-upon-the-subfornical-organ-to-upregulate-the-sympathoexcitatory-milieu-of-the-hypothalamic-paraventricular-nucleus
#3
Shun-Guang Wei, Yang Yu, Robert B Felder
We previously reported that microinjection of the pro-inflammatory cytokine interleukin-1 beta (IL-1β) into the subfornical organ (SFO) elicits a pressor response accompanied by increases in inflammation and renin-angiotensin system (RAS) activity in the SFO and in the hypothalamic paraventricular nucleus (PVN). The present study sought to determine whether blood-borne IL-1β induces similar neurochemical changes in the SFO and PVN, and, if so, whether increased inflammation and RAS activity at the SFO level orchestrate the sympathoexcitatory response to circulating IL-1β...
November 22, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29163965/use-of-inhibitors-of-the-renin-angiotensin-system-is-associated-with-longer-survival-in-patients-with-hepatocellular-carcinoma
#4
Matthias Pinter, Arndt Weinmann, Marcus-Alexander Wörns, Florian Hucke, Simona Bota, Jens U Marquardt, Dan G Duda, Rakesh K Jain, Peter R Galle, Michael Trauner, Markus Peck-Radosavljevic, Wolfgang Sieghart
Background: Inhibition of the renin-angiotensin system (RAS) was associated with longer survival in patients with different solid malignancies. Objective: The objective of this study was to investigate the effect of RAS inhibitor (RASi) treatment (angiotensin-converting enzyme inhibitors or angiotensin-II-receptor blockers) on survival of patients with hepatocellular carcinoma (HCC). Methods: Patients diagnosed with HCC and Child-Pugh A between 1992 and 2013 who received sorafenib, experimental therapy, or best supportive care were eligible for the Vienna cohort...
November 2017: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/29163145/insulin-like-growth-factor-1-and-neuroinflammation
#5
REVIEW
Jose L Labandeira-Garcia, Maria A Costa-Besada, Carmen M Labandeira, Begoña Villar-Cheda, Ana I Rodríguez-Perez
Insulin-like growth factor-1 (IGF-1) effects on aging and neurodegeneration is still controversial. However, it is widely admitted that IGF-1 is involved in the neuroinflammatory response. In peripheral tissues, several studies showed that IGF-1 inhibited the expression of inflammatory markers, although other studies concluded that IGF-1 has proinflammatory functions. Furthermore, proinflammatory cytokines such as TNF-α impaired IGF-1 signaling. In the brain, there are controversial results on effects of IGF-1 in neuroinflammation...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29162996/combination-of-%C3%AE-adrenergic-receptor-block-and-renin-angiotensin-system-inhibition-diminished-the-angiotensin-ii-induced-vasoconstriction-and-increased-bradykinin-induced-vasodilation-in-hypertension
#6
Diego Lezama-Martínez, Ignacio Valencia-Hernández, Jazmin Flores-Monroy, Luisa Martínez-Aguilar
In hypertension, the combination therapy is frequently used to obtain a better therapeutic effect and reduce adverse effects. One effective combination is with inhibitors and β-blockers of renin-angiotensin system. Although the mechanisms of action of each drug are already known, the antihypertensive mechanism is more complex and therefore the combined treatment mechanism is unclear. Specifically, the effect of the treatments of angiotensin-converting enzyme inhibitor or AT1 receptor antagonist with β-blocker on the angiotensin II and bradykinin reactivity has not been studied...
October 2017: Dose-response: a Publication of International Hormesis Society
https://www.readbyqxmd.com/read/29162655/cardiovascular-effects-of-small-peptides-of-the-renin-angiotensin-system
#7
Patrícia L Moraes, Lucas M Kangussu, Luiz Gonzaga da Silva, Carlos H Castro, Robson A S Santos, Anderson J Ferreira
The renin-angiotensin system (RAS) is a unique hormonal cascade which is composed by multiple enzymes and effector peptides. Recently, new peptides presenting biological activity have been discovered, increasing the complexity of the RAS Here, we evaluated the effects of small peptides of the RAS in coronary bed of rats. Firstly, we examined the direct effect of small angiotensinergic peptides [Angiotensin (Ang) -(1-5), Ang-(1-4) Ang-(1-3), and Ang-(1-2)] in coronary vessels. Noteworthy, it was observed that Ang-(1-4), Ang-(1-3), and Ang-(1-2) caused a significant reduction in pressure perfusion...
November 2017: Physiological Reports
https://www.readbyqxmd.com/read/29159527/melatonin-ameliorates-intrarenal-renin-angiotensin-system-in-a-5-6-nephrectomy-rat-model
#8
Sayaka Ishigaki, Naro Ohashi, Takashi Matsuyama, Shinsuke Isobe, Naoko Tsuji, Takamasa Iwakura, Tomoyuki Fujikura, Takayuki Tsuji, Akihiko Kato, Hiroaki Miyajima, Hideo Yasuda
BACKGROUND: Activation of the intrarenal renin-angiotensin system (RAS) plays a critical role in the pathophysiology of chronic kidney disease (CKD) and hypertension. It has been reported that reactive oxygen species (ROS) are important components of intrarenal RAS activation. Melatonin is recognized as a powerful antioxidant, and we recently reported that impaired nighttime melatonin secretion correlates negatively with urinary angiotensinogen excretion, the surrogate marker of intrarenal RAS activity in patients with CKD...
November 20, 2017: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/29157197/selection-for-female-traits-of-high-fertility-affects-male-reproductive-performance-and-alters-the-testicular-transcriptional-profile
#9
Marten Michaelis, Alexander Sobczak, Dirk Koczan, Martina Langhammer, Norbert Reinsch, Jennifer Schoen, Joachim M Weitzel
BACKGROUND: Many genes important for reproductive performance are shared by both sexes. However, fecundity indices are primarily based on female parameters such as litter size. We examined a fertility mouse line (FL2), which has a considerably increased number of offspring and a total litter weight of 180% compared to a randomly bred control line (Ctrl) after more than 170 generations of breeding. In the present study, we investigated whether there might be a parallel evolution in males after more than 40 years of breeding in this outbred mouse model...
November 21, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29157100/imbalanced-plasma-ace-and-ace2-level-in-the-uremic-patients-with-cardiovascular-diseases-and-its-change-during-a-single-hemodialysis-session
#10
Chung-Wei Yang, Li-Che Lu, Chia-Chu Chang, Ching-Chang Cho, Wen-Yeh Hsieh, Chin-Hung Tsai, Yi-Chang Lin, Chih-Sheng Lin
BACKGROUND: The renin-angiotensin system (RAS) has significant influences on heart and renal disease progression. Angiotensin converting enzyme (ACE) and angiotensin converting enzyme II (ACE2) are major peptidases of RAS components and play counteracting functions through angiotensin II (Ang II)/ATIR and angiotensin-(1-7) (Ang-(1-7))/Mas axis, respectively. METHODS: There were 360 uremic patients on regular hemodialysis (HD) treatment (inclusive of 119 HD patients with cardiovascular diseases (CVD) and 241 HD patients without CVD and 50 healthy subjects were enrolled in this study...
November 2017: Renal Failure
https://www.readbyqxmd.com/read/29155873/short-term-anti-proteinuric-effect-of-tacrolimus-is-not-related-to-preservation-of-the-glomerular-filtration-rate-in-iga-nephropathy-a-5-year-follow-up-study
#11
Mi-Yeon Yu, Yong-Chul Kim, Ho Suk Koo, Ho Jun Chin
BACKGROUND: The immunosuppressive drug tacrolimus has the short-term effect of reducing proteinuria in patients with immunoglobulin A nephropathy (IgAN). Our study investigated the effects on proteinuria and kidney function after discontinuation of tacrolimus. METHODS: Patients with biopsy-proven IgAN were included in the study and randomly divided into two treatment groups. There was a corresponding control group for each treatment group. The first group included patients treated with tacrolimus (Tac vs non-Tac group) and the second group included patients with a renin angiotensin system blocker (RASi vs non-RASi group)...
2017: PloS One
https://www.readbyqxmd.com/read/29155297/divergent-profile-between-hypothalamic-and-plasmatic-aminopeptidase-activities-in-wky-and-shr-influence-of-beta-adrenergic-blockade
#12
Isabel Prieto, Ana B Segarra, Marc de Gasparo, Magdalena Martínez-Cañamero, Manuel Ramírez-Sánchez
AIMS: Wistar-Kyoto (WKY) and spontaneously hypertensive rats (SHR) differ in their renin-angiotensin system function and sympathetic tone. The metabolism of angiotensins and vasopressin depends on the action of certain aminopeptidases whose activity may be influenced by the autonomic nervous system. Their regulation may differ between WKY and SHR in hypothalamus and plasma according to the sympathetic tone. We analyzed aminopeptidases responsible for the hydrolysis of certain angiotensins, vasopressin, cholecystokinin or enkephalins in hypothalamus and plasma of WKY and SHR in untreated controls rats and under beta-adrenoceptor blockade...
November 16, 2017: Life Sciences
https://www.readbyqxmd.com/read/29155208/inflammatory-renin-angiotensin-system-disruption-attenuates-sensory-hyperinnervation-and-mechanical-hypersensitivity-in-a-rat-model-of-provoked-vestibulodynia
#13
Anuradha Chakrabarty, Zhaohui Liao, Ying Mu, Peter G Smith
Vestibulodynia is characterized by peri-vaginal mechanical hypersensitivity, hyperinnervation, and abundant inflammatory cells expressing renin-angiotensin system proteins. We developed a tractable rat model of vestibulodynia to further assess the contributions of the renin-angiotensin system. Complete Freund's adjuvant (CFA) injected into the posterior vestibule induced marked vestibular hypersensitivity throughout a 7-day test period. Numbers of axons immunoreactive for PGP9.5, calcitonin gene-related peptide, and GFRα2 were increased...
November 15, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/29154432/proposal-for-heart-failure-progression-based-on-the-chloride-theory-worsening-heart-failure-with-increased-vs-non-increased-serum-chloride-concentration
#14
Hajime Kataoka
AIMS: Chloride (Cl) is an established key electrolyte for the activation of the renin-angiotensin-aldosterone system. Recent studies have shown the serum Cl as a key electrolyte for the regulation of body fluid distribution in heart failure (HF) patients. The clinical differences of worsening HF status according to the changes in serum Cl concentration are unclear. METHODS AND RESULTS: Data from 47 chronic HF patients were analysed. Upon worsening HF, each patient exhibited at least two HF-related signs...
November 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/29153995/longitudinal-estimated-gfr-trajectories-in-patients-with-and-without-type-2-diabetes-and-nephropathy
#15
Misghina Weldegiorgis, Dick de Zeeuw, Liang Li, Hans-Henrik Parving, Fan Fan Hou, Giuseppe Remuzzi, Tom Greene, Hiddo J L Heerspink
BACKGROUND: In clinical practice and clinical trials, changes in serum creatinine concentrations are used to evaluate changes in kidney function. It has been assumed that these changes follow a linear pattern when serum creatinine concentration is converted to estimated glomerular filtration rate (eGFR). However, the paradigm that kidney function declines linearly over time has been questioned by studies showing either linear or nonlinear patterns. To verify how this impacts on kidney end points in intervention trials, we analyzed eGFR trajectories in multiple clinical trials of patients with and without diabetes...
November 16, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/29153690/time-course-of-angiotensin-ii-dependent-vascular-and-metabolic-effects-of-preeclampsia
#16
Paula Rosas, Cecilia Tufiño, Ismael Bracho Valdes, Rosa A Bobadilla Lugo
Pregnancy is characterized by a blunted pressor response to angiotensin II that is progressively lost during preeclampsia complicated pregnancies. Renin angiotensin system (RAS) plays a pivotal role in cardiovascular and renal function but its role in normal and pathological pregnancy is far from being clarified. It is not as clear if hypertension and particularly pregnancy-induced hypertension as the initial event, can trigger some of the metabolic syndrome components, and if these changes are angiotensin II mediated...
October 2017: Pregnancy Hypertension
https://www.readbyqxmd.com/read/29150471/biochemical-monitoring-after-initiation-of-aldosterone-antagonist-therapy-in-users-of-renin-angiotensin-system-blockers-a-uk-primary-care-cohort-study
#17
Sarah-Jo Sinnott, Kathryn E Mansfield, Morten Schmidt, Krishnan Bhaskaran, Liam Smeeth, Dorothea Nitsch, Laurie A Tomlinson
OBJECTIVE: To determine the frequency of biochemical monitoring after initiation of aldosterone antagonists(AA) in patients also using angiotensin-converting enzyme inhibitors/angiotensin receptor blockers (ACEI/ARB). SETTING: UK primary care. PARTICIPANTS: ACEI/ARB users who initiated AA between 2004 and 2014. OUTCOMES: We calculated the proportions with: (1) biochemical monitoring ≤2 weeks post initiation of AA, (2) adverse biochemical values ≤2 months (potassium ≥6 mmol/L, creatinine ≥220 µmol/L and ≥30% increase in creatinine from baseline) and (3) discontinuers of AA in those with an adverse biochemical value...
November 16, 2017: BMJ Open
https://www.readbyqxmd.com/read/29149676/high-salt-diet-decreases-reproductive-performance-in-rams-and-down-regulates-gene-expression-of-some-components-of-the-renin-angiotensin-system-in-the-testis
#18
Yi Fang, Rongzhen Zhong, Xuezhao Sun, Daowei Zhou
Although salt-tolerant plants can be used to combat dryland salinity, these plants contain high concentrations of salt (NaCl), which may have deleterious effects if fed to livestock. Twenty-four Merino rams (9 mo of age) with similar body weight were equally allocated to two groups and fed a normal- or high-salt diet (0.5 and 12% NaCl, respectively) for 3 mo. Rams fed the high-salt diet had lower live weight gains, higher water intake, smaller testes (466 ± 48.4 vs 604 ± 51.1 g) and reductions (P <0...
November 10, 2017: Theriogenology
https://www.readbyqxmd.com/read/29147581/review-of-and-updates-on-hypertension-in-obstructive-sleep-apnea
#19
REVIEW
Masood Ahmad, Devan Makati, Sana Akbar
Obstructive sleep apnea (OSA) is a prevalent sleep disorder as is hypertension (HTN) in the 21st century with the rising incidence of obesity. Numerous studies have shown a strong association of OSA with cardiovascular morbidity and mortality. There is overwhelming evidence supporting the relationship between OSA and hypertension (HTN). The pathophysiology of HTN in OSA is complex and dependent on various factors such as sympathetic tone, renin-angiotensin-aldosterone system, endothelial dysfunction, and altered baroreceptor reflexes...
2017: International Journal of Hypertension
https://www.readbyqxmd.com/read/29146604/the-effect-of-treatment-for-sleep-apnoea-on-determinants-of-blood-pressure-control
#20
Raquel Casitas, Elisabet Martínez-Cerón, Raúl Galera, Carolina Cubillos-Zapata, María Jesús González-Villalba, Isabel Fernández-Navarro, Begoña Sánchez, Aldara García-Sánchez, Ester Zamarrón, Francisco García-Río
Our aim was to assess the effect of continuous positive airway pressure (CPAP) on the nocturnal evolution of peripheral chemosensitivity, renin-angiotensin-aldosterone system activity, sympathetic tone and endothelial biomarkers in obstructive sleep apnoea (OSA) patients with isolated nocturnal hypertension (INH) or day-night sustained hypertension (D-NSH).In a crossover randomised trial, 32 OSA patients newly diagnosed with hypertension and without antihypertensive treatment were randomly assigned to 12 weeks of CPAP or sham CPAP...
November 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
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