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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
#1
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/28204966/inhibition-of-the-renin-angiotensin-system-post-myocardial-infarction-prevents-inflammation-associated-acute-cardiac-rupture
#2
Xiao-Ming Gao, Alan Tsai, Annas Al-Sharea, Yidan Su, Shirley Moore, Li-Ping Han, Helen Kiriazis, Anthony M Dart, Andrew J Murphy, Xiao-Jun Du
PURPOSE: Inhibition of the renin-angiotensin system (RAS) is beneficial in patient management after myocardial infarction (MI). However, whether RAS inhibition also provides cardiac protection in the acute phase of MI is unclear. METHODS: Male 129sv mice underwent coronary artery occlusion to induce MI, followed by treatment with losartan (L, 20 and 60 mg/kg), perindopril (P, 2 and 6 mg/kg), amlodipine (20 mg/kg as a BP-lowering agent) or vehicle as control. Drug effects on hemodynamics were examined...
February 15, 2017: Cardiovascular Drugs and Therapy
https://www.readbyqxmd.com/read/28197292/chlorthalidone-plus-amiloride-reduces-the-central-systolic-blood-pressure-in-stage-1-hypertension-patients
#3
Leticia Aparecida Barufi Fernandes, Elizabeth do Espirito Santo Cestario, Luciana Neves Cosenso-Martin, Jose Fernando Vilela-Martin, Juan Carlos Yugar-Toledo, Flavio Danni Fuchs
BACKGROUND: Hypertension reduction strategies use blood pressure in the brachial artery as the primary endpoint. Individuals who achieve the target blood pressure reduction with antihypertensive treatment have residual cardiovascular risk attributed to the difference in pressure between the aorta and brachial artery. Antihypertensive treatment affects the intrinsic properties of the vascular wall and arterial stiffness markers and consequently the central pressure. Recent publications stress the importance of adequate control of the central compared to peripheral blood pressure...
December 2016: Cardiology Research
https://www.readbyqxmd.com/read/28192516/correction-atorvastatin-losartan-and-captopril-lead-to-upregulation-of-tgf-%C3%AE-and-downregulation-of-il-6-in-coronary-artery-disease-and-hypertension
#4
Zahra Sepehri, Mohammad Masoumi, Nazanin Ebrahimi, Zohre Kiani, Ali Akbar Nasiri, Farhad Kohan, Mahmood Sheikh Fathollahi, Mohammad Kazemi Arababadi, Gholamreza Asadikaram
[This corrects the article DOI: 10.1371/journal.pone.0168312.].
2017: PloS One
https://www.readbyqxmd.com/read/28192151/angiotensin-1-7-dependent-vasorelaxation-of-the-renal-artery-exhibits-unique-angiotensin-and-bradykinin-receptor-selectivity
#5
Mariam H M Yousif, Ibrahim F Benter, Debra I Diz, Mark C Chappell
Angiotensin-(1-7) [Ang-(1-7)] exhibits blood pressure lowering actions, inhibits cell growth, and reduces tissue inflammation and fibrosis which may functionally antagonize an activated Ang II-AT1 receptor axis. Since the vascular actions of Ang-(1-7) and the associated receptor/signaling pathways varies in different vascular beds, the current study established the vasorelaxant properties of the heptapeptide in the renal artery of male Wistar male rats. Ang-(1-7) produced an endothelium-dependent vasodilator relaxation of isolated renal artery segments pre-contracted by a sub-maximal concentration of phenylephrine (PE) (10(-7)M)...
February 9, 2017: Peptides
https://www.readbyqxmd.com/read/28179255/calcium-channel-blockade-blunts-the-renal-effects-of-acute-nitric-oxide-synthase-inhibition-in-healthy-humans
#6
Alberto Montanari, Davide Lazzeroni, Giovanna Pelà, Antonio Crocamo, Yuliya Lytvyn, Luisa Musiari, Aderville Cabassi, David Z I Cherney
AIMS: To investigate whether blockade of calcium channels (CCs) or Angiotensin II Type 1 receptors 1 (AT1R) modulates renal responses to nitric oxide synthesis inhibition (NOSI) in humans. METHODS: Fourteen sodium replete healthy volunteers underwent 90 minute infusions of 3.0 μg.kg.min-1 NG-nitro-L-arginine methylester (L-NAME), on 3 occasions, preceded by 3 days of either placebo (PL), 10 mg Manidipine (MANI), or 50 mg losartan (LOS). At each phase, mean arterial pressure (MAP), glomerular filtration rate (GFR, inulin), renal blood flow (RBF, p-aminohippurate), urinary sodium (UNaV) and 8-isoprostane (U8-iso-PGF2αV - an oxidative stress marker) were measured...
February 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28168814/targeting-multiple-pathways-reduces-renal-and-cardiac-fibrosis-in-rats-with-subtotal-nephrectomy-followed-by-coronary-ligation
#7
N R Oosterhuis, L G Bongartz, M C Verhaar, C Cheng, Y J Xu, A van Koppen, M J Cramer, R Goldschmeding, C A Gaillard, P A Doevendans, B Braam, J A Joles
AIM: Multiple interacting pathways contribute to progression of renal and cardiac damage in chronic kidney disease followed by chronic heart failure (renocardiac syndrome). We hypothesized that simultaneous pharmacological modulation of critical pathways implicated in renocardiac syndrome would effectively reduce fibrosis in and preserve function of heart and kidney. METHODS: Rats were subjected to subtotal nephrectomy followed 9 weeks later by coronary artery ligation...
November 7, 2016: Acta Physiologica
https://www.readbyqxmd.com/read/28161159/early-treatment-with-losartan-effectively-ameliorates-hypertension-and-improves-vascular-remodeling-and-function-in-a-prehypertensive-rat-model
#8
De-Hua He, Jin-Xiu Lin, Liang-Min Zhang, Chang-Sheng Xu, Qiang Xie
AIMS: Pharmacological treatment of prehypertension may ameliorate hypertension and improve vascular structure and function. This study investigated 1) whether early treatment with either losartan or amlodipine at the onset of prehypertension can prevent hypertension and 2) whether losartan and amlodipine equally improve vascular remodeling and function in a rat model of hypertension. MATERIALS AND METHODS: Stroke-prone spontaneously hypertensive (SHRSP) rats were administered losartan, amlodipine or saline for 6 or 16weeks at the onset of prehypertension...
February 1, 2017: Life Sciences
https://www.readbyqxmd.com/read/28160390/angiotensin-ii-type-ii-receptors-and-colonic-dysmotility-in-2-4-dinitrofluorobenzenesulfonic-acid-induced-colitis-in-rats
#9
M G Zizzo, M Auteri, A Amato, G Caldara, D Nuzzo, M Di Carlo, R Serio
BACKGROUND: Angiotensin II (Ang II), the main peptide of the renin-angiotensin system (RAS), has been suggested to be involved in inflammatory bowel diseases. Since RAS has emerged as gut motility regulator, and dysmotility is associated with intestinal inflammation, our objective was to investigate in rat 2,4-dinitrobenzenesulfonic acid (DNBS)-induced colitis the functionality of RAS and its contribution to colonic motor alterations. METHODS: The effects of Ang II on the longitudinal colonic muscular contractility of control and DNBS-treated rats were characterized in vitro...
February 3, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28157237/mechanisms-underlying-the-cardiac-antifibrotic-effects-of-losartan-metabolites
#10
José Luis Miguel-Carrasco, Javier Beaumont, Gorka San José, María U Moreno, Begoña López, Arantxa González, Guillermo Zalba, Javier Díez, Ana Fortuño, Susana Ravassa
Excessive myocardial collagen deposition and cross-linking (CCL), a process regulated by lysyl oxidase (LOX), determines left ventricular (LV) stiffness and dysfunction. The angiotensin II antagonist losartan, metabolized to the EXP3179 and EXP3174 metabolites, reduces myocardial fibrosis and LV stiffness in hypertensive patients. Our aim was to investigate the differential influence of losartan metabolites on myocardial LOX and CCL in an experimental model of hypertension with myocardial fibrosis, and whether EXP3179 and EXP3174 modify LOX expression and activity in fibroblasts...
February 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28149929/data-on-the-effects-of-losartan-on-protein-expression-vascular-reactivity-and-antioxidant-capacity-in-the-aorta-of-ethanol-treated-rats
#11
Carla S Ceron, Gabriel T do Vale, Janaina A Simplicio, Patrícia Passaglia, Sthefany T Ricci, Carlos R Tirapelli
We describe the effects of losartan, a selective AT1 receptor antagonist on the alterations induced by treatment with ethanol in the rat aorta. The data shown here are related to the article entitled "Angiotensin type 1 receptor mediates chronic ethanol consumption-induced hypertension and vascular oxidative stress" (P. Passaglia, C.S. Ceron, A.S. Mecawi, J. Antunes-Rodrigues, E.B. Coelho, C.R. Tirapelli, 2015) [1]. Here we include new data on the protective effect of losartan against ethanol-induced oxidative stress...
April 2017: Data in Brief
https://www.readbyqxmd.com/read/28146117/anti-fibrotic-effect-of-losartan-an-angiotensin-ii-receptor-blocker-is-mediated-through-inhibition-of-er-stress-via-up-regulation-of-sirt1-followed-by-induction-of-ho-1-and-thioredoxin
#12
Hyosang Kim, Chung Hee Baek, Raymond Bok Lee, Jai Won Chang, Won Seok Yang, Sang Koo Lee
Endoplasmic reticulum (ER) stress is increasingly identified as modulator of fibrosis. Losartan, an angiotensin II receptor blocker, has been widely used as the first choice of treatment in chronic renal diseases. We postulated that anti-fibrotic effect of losartan is mediated through inhibition of ER stress via SIRT1 (silent mating type information regulation 2 homolog 1) hemeoxygenase-1 (HO-1)/thioredoxin pathway. Renal tubular cells, tunicamycin (TM)-induced ER stress, and unilateral ureteral obstruction (UUO) mouse model were used...
January 31, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28144709/glucagon-increase-after-chronic-at1-blockade-is-more-likely-related-to-an-indirect-leptin-dependent-than-to-a-pancreatic-%C3%AE-cell-dependent-mechanism
#13
Martin Mildner, Helge Müller-Fielitz, Ines Stölting, Olaf Jöhren, Muscha Steckelings, Walter Raasch
AT1 blockers (ARB) prevent diabetes by improving pancreatic β cell function. Less is known about whether α cells are affected although they express angiotensin II (AngII) receptors. We aimed to investigate glucagon release upon AngII stimulation. We determined glucagon release after AngII stimulation (0.01-100 μM) in α cells (InR1G9) and isolated murine islets. We determined plasma glucagon in rats that were chronically treated with AngII (9 μg/h) or the ARBs telmisartan (8 mg/kg/day) and candesartan (16 mg/kg/day) and correlated glucagon with additional hormones (e...
January 31, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28107915/a-clean-photometric-method-for-the-determination-of-losartan-potassium-in-pharmaceuticals-exploiting-light-scattering-effect-and-employing-a-multicommuted-flow-analysis-approach
#14
Manoel J A Lima, Boaventura F Reis
This paper describes an environmentally friendly procedure for the determination of losartan potassium (Los-K) in pharmaceuticals. The photometric method was based on the light scattering effect due to particles suspension, which were formed by the reaction of Los-K with Cu (II) ions. The method was automated employing a multicommuted flow analysis approach, implemented using solenoid mini-pumps for fluid propelling and a homemade LED based photometer. Under the optimized experimental conditions, the procedure showed a linear relationship in the concentration range of 23...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107310/the-renin-inhibitor-aliskiren-protects-rat-lungs-from-the-histopathologic-effects-of-fat-embolism
#15
Amanda N Fletcher, Agostino Molteni, Rakesh Ponnapureddy, Chirag Patel, Mark Pluym, Alan M Poisner
BACKGROUND: Fat embolism (FE) and the consequent FE syndrome occurring after trauma or surgery can lead to serious pulmonary injury, including ARDS and death. Current treatment of FE syndrome is limited to supportive therapy. We have shown in a rat model that the renin angiotensin system plays a significant role in the pathophysiology of FE because drugs interfering with the renin angiotensin system, captopril and losartan reduce the histopathologic pulmonary damage. The purpose of the current study was to determine if inhibition of renin by aliskiren, an FDA-approved drug for treating hypertension, would produce effective protection in the same model...
2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28105085/effects-of-shen-an-granules-on-wnt-signaling-pathway-in-mouse-models-of-diabetic-nephropathy
#16
Xin-Rong Zou, Xiao-Qin Wang, Ying-Lin Hu, Hui-Lan Zhou
The effect of Shen'an granules on the Wnt signaling pathway in renal tissues of mouse models of streptozotocin (STZ)-induced diabetic nephropathy was investigated in the present study. A total of 62 BALB/c mice were randomly divided into the normal control (A group), model (B group), losartan (C group), low-dose Shen'an granules (D group), and high-dose Shen'an granules (E group) groups. The mouse model of diabetic nephropathy was established by a single intraperitoneal injection of STZ (150 mg/kg). The animals were treated with drugs for 8 weeks, and blood creatinine, blood urea nitrogen, triglycerides (TG), and total cholesterol (CHOL) were measured prior to and after treatment...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28104714/long-term-biased-%C3%AE-arrestin-signaling-improves-cardiac-structure-and-function-in-dilated-cardiomyopathy
#17
David M Ryba, Jieli Li, Conrad L Cowan, Brenda Russell, Beata M Wolska, R John Solaro
BACKGROUND: -Biased agonism of the angiotensin receptor (AT1R) is known to promote cardiac contractility. Our laboratory indicated that these effects may be due to changes at the level of the myofilaments. However, these signaling mechanisms remain unknown. As a common finding in dilated cardiomyopathy (DCM) is a reduction in the myofilament-Ca(2+)-response, we hypothesized that β-arrestin signaling would increase myofilament-Ca(2+)-responsiveness in a model of familial DCM and improve cardiac function and morphology...
January 19, 2017: Circulation
https://www.readbyqxmd.com/read/28100922/the-effects-of-missed-doses-of-amlodipine-and-losartan-on-blood-pressure-in-older-hypertensive-patients
#18
Peter W de Leeuw, Robert Fagard, Abraham A Kroon
This randomized, double-blind, parallel-group, multicenter study compared the efficacy of amlodipine and losartan in an older hypertensive population, focusing on therapeutic coverage in the case of missed doses. Following a 4-week, single-blind, placebo washout period, 211 patients were randomly assigned to receive either 5 mg of amlodipine once daily or 50 mg of losartan once daily. Doses were doubled after 6 weeks of treatment if the diastolic blood pressure exceeded 90 mm Hg. After the 12-week treatment period, patients received the placebo for 2 days (drug holiday) to simulate two missed doses of antihypertensive medication...
January 19, 2017: Hypertension Research: Official Journal of the Japanese Society of Hypertension
https://www.readbyqxmd.com/read/28098884/renin-angiotensin-system-activation-accelerates-atherosclerosis-in-experimental-renal-failure-by-promoting-endoplasmic-reticulum-stress-related-inflammation
#19
Jia Yang, Xi Zhang, Xinyi Yu, Weixue Tang, Hua Gan
In this study, we investigated the association between the renin-angiotensin system (RAS), endoplasmic reticulum (ER) stress and atherosclerosis (AS) in uremic apolipoprotein E knockout (apoE-/-) mice. Mild uremia was induced by a 5/6 nephrectomy (5/6 Nx) in 10-week-old apoE-/- mice. Four weeks after nephrectomy, the mice received losartan or no treatment for 16 weeks. Sham-operated mice served as the controls. We found that uremia accelerated AS at the aortic root. The activation of ER stress and the significant upregulation of pro-inflammatory cytokines and chemokines were observed in the uremic mice...
January 12, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28077465/cost-effectiveness-of-the-polypill-versus-risk-assessment-for-prevention-of-cardiovascular-disease
#20
Bart S Ferket, M G Myriam Hunink, Mohammed Khanji, Isha Agarwal, Kirsten E Fleischmann, Steffen E Petersen
OBJECTIVE: There is an international trend towards recommending medication to prevent cardiovascular disease (CVD) in individuals at increasingly lower cardiovascular risk. We assessed the cost-effectiveness of a population approach with a polypill including a statin (simvastatin 20 mg) and three antihypertensive agents (amlodipine 2.5 mg, losartan 25 mg and hydrochlorothiazide 12.5 mg) and periodic risk assessment with different risk thresholds. METHODS: We developed a microsimulation model for lifetime predictions of CVD events, diabetes, and death in 259 146 asymptomatic UK Biobank participants aged 40-69 years...
January 11, 2017: Heart: Official Journal of the British Cardiac Society
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