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https://www.readbyqxmd.com/read/29122658/endothelium-derived-contraction-in-a-model-of-rheumatoid-arthritis-is-mediated-via-angiotensin-ii-type-1-receptors
#1
Kayleigh Hamilton, Lynette Dunning, William R Ferrell, John C Lockhart, Andrew MacKenzie
A role for endothelium-derived constricting factors (EDCF), and the angiotensin II type 1 receptor (AT1R) pathway, in the vascular impairment found in the rat Freund's complete adjuvant (FCA)-model of rheumatoid arthritis (RA) was examined. FCA arthritis was induced in rats±losartan. Vehicle-treated rats served as controls. Knee-joint swelling and red blood cell (RBC) aggregation were measured as indicators of inflammation and endothelium reactivity assessed by response to acetylcholine (ACh) on aortic rings...
November 6, 2017: Vascular Pharmacology
https://www.readbyqxmd.com/read/28827087/cerebrovascular-recovery-after-stroke-with-individual-and-combined-losartan-and-captopril-treatment-of-shrsp
#2
COMPARATIVE STUDY
John S Smeda, Noriko Daneshtalab
We assessed whether the superior restoration of cerebrovascular function after hemorrhagic stroke by losartan versus captopril treatment was due to better BP, uremia, uricaemia, or aldosterone control in Kyoto Wistar stroke-prone-hypertensive rats and evaluated whether elevated angiotensin II (A2) levels enhanced the effectiveness of losartan treatment. Constriction was studied in the middle cerebral arteries (MCAs) using a pressure myograph. Post-stroke survival increased from 21 to 310 and 189days respectively with losartan and captopril treatment...
September 2017: Vascular Pharmacology
https://www.readbyqxmd.com/read/28754590/telmisartan-mitigates-hyperglycemia-induced-vascular-inflammation-by-increasing-gsk3%C3%AE-ser-9-phosphorylation-in-endothelial-cells-and-mouse-aortas
#3
Kee-Ho Song, Sun-Ju Bae, Jiyeon Chang, Jung-Hyun Park, Inho Jo, Kae Won Cho, Du-Hyong Cho
Telmisartan, an angiotensin II type 1 receptor blocker (ARB), attenuates hyperglycemia-aggravated vascular inflammation by decreasing IκB kinase β (IKKβ) expression in endothelial cells. Because glycogen synthase 3β (GSK3β) is involved in inflammatory process by regulating nuclear factor-κB (NF-κB) activity, we investigated whether GSK3β mediates telmisartan-ameliorated vascular inflammation in hyperglycemia-treated endothelial cells and high-fat diet (HFD)-fed mice. Telmisartan remarkably induced GSK3β-Ser(9) phosphorylation in hyperglycemia-treated endothelial cells that accompanied a decrease in hyperglycemia-induced NF-κB p65-Ser(536) phosphorylation, vascular cell adhesion molecule-1 (VCAM-1) expression, and THP-1 monocyte adhesion...
September 30, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28544543/acute-toll-like-receptor-4-activation-impairs-rat-renal-microvascular-autoregulatory-behaviour
#4
J P Van Beusecum, S Zhang, A K Cook, E W Inscho
AIM: Little is known about how toll-like receptor 4 (TLR4) influences the renal microvasculature. We hypothesized that acute TLR4 stimulation with lipopolysaccharide (LPS) impairs afferent arteriole autoregulatory behaviour, partially through reactive oxygen species (ROS). METHODS: We assessed afferent arteriole autoregulatory behaviour after LPS treatment (1 mg kg(-1) ; i.p.) using the in vitro blood-perfused juxtamedullary nephron preparation. Autoregulatory behaviour was assessed by measuring diameter responses to stepwise changes in renal perfusion pressure...
November 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28542215/treatment-with-enalapril-and-not-diltiazem-ameliorated-progression-of-chronic-kidney-disease-in-rats-and-normalized-renal-at1-receptor-expression-as-measured-with-pet-imaging
#5
Basma Ismail, Rob A deKemp, Etienne Croteau, Tayebeh Hadizad, Kevin D Burns, Rob S Beanlands, Jean N DaSilva
ACE inhibitors are considered first line of treatment in patients with many forms of chronic kidney disease (CKD). Other antihypertensives such as calcium channel blockers achieve similar therapeutic effectiveness in attenuating hypertension-related renal damage progression. Our objective was to explore the value of positron emission tomography (PET) imaging of renal AT1 receptor (AT1R) to guide therapy in the 5/6 subtotal-nephrectomy (Nx) rat model of CKD. Ten weeks after Nx, Sprague-Dawley rats were administered 10mg/kg/d enalapril (NxE), 30mg/kg/d diltiazem (NxD) or left untreated (Nx) for an additional 8-10 weeks...
2017: PloS One
https://www.readbyqxmd.com/read/28476949/angiotensin-iv-receptors-mediate-the-cognitive-and-cerebrovascular-benefits-of-losartan-in-a-mouse-model-of-alzheimer-s-disease
#6
Jessika Royea, Luqing Zhang, Xin-Kang Tong, Edith Hamel
The use of angiotensin receptor blockers (ARBs) correlates with reduced onset and progression of Alzheimer's disease (AD). The mechanism depicting how ARBs such as losartan restore cerebrovascular and cognitive deficits in AD is unknown. Here, we propose a mechanism underlying losartan's benefits by selectively blocking the effects of angiotensin IV (AngIV) at its receptor (AT4R) with divalinal in mice overexpressing the AD-related Swedish and Indiana mutations of the human amyloid precursor protein (APP mice) and WT mice...
May 31, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28442323/the-ace-2-ang1-7-mas-cascade-enhances-bone-structure-and-metabolism-following-angiotensin-ii-type-1-receptor-blockade
#7
Hatem M Abuohashish, Mohammed M Ahmed, Dina Sabry, Mahmoud M Khattab, Salim S Al-Rejaie
The renin angiotensin system (RAS) regulates numerous systemic functions and is expressed locally in skeletal tissues. Angiotensin1-7 (Ang1-7) is a beneficial member of the RAS, and the therapeutic effects of a large number of angiotensin receptors blockers (ARBs) are mediated by an Ang1-7-dependent cascade. This study examines whether the reported osteo-preservative effects of losartan are mediated through the angiotensin converting enzyme2 (ACE-2)/Ang1-7/Mas pathway in ovariectomized (OVX) rats. Sham and OVX animals received losartan (10mg/kg/d p...
July 15, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28420111/plantago-asiatica-l-ameliorates-puromycin-aminonucleoside-induced-nephrotic-syndrome-by-suppressing-inflammation-and-apoptosis
#8
Min Chul Kho, Ji Hun Park, Byung Hyuk Han, Rui Tan, Jung Joo Yoon, Hye Yoom Kim, You Mee Ahn, Yun Jung Lee, Dae Gill Kang, Ho Sub Lee
OBJECTIVE: Nephrotic syndrome, a kidney disease with a variety of causes, is mainly characterized by heavy proteinuria, hypoproteinemia, and ascites. This study was designed to evaluate the underlying mechanism of action of Plantago asiatica L. (PAL) in treating nephrotic syndrome induced by puromycin aminonucleoside. METHODS: PAL has been used in Asia as a traditional medicine and dietary health supplement. Sprague-Dawley (SD) rats were intravenously injected with puromycin aminonucleoside (75 mg/kg/day), then treated with either Losartan (30 mg/kg/day) or PAL (200 mg/kg/day) by oral gavage for seven days...
April 14, 2017: Nutrients
https://www.readbyqxmd.com/read/28410843/left-ventricular-hypertrophy-does-not-prevent-heart-failure-in-experimental-hypertension
#9
H Hernán Gómez Llambí, G Cao, M Donato, D Suárez, G Ottaviano, A Müller, B Buchholz, R Gelpi, M Otero-Losada, J Milei
BACKGROUND: Left ventricular hypertrophy (LVH) secondary to hypertension has been accepted to prevent heart failure (HF) while paradoxically increasing cardiovascular morbi-mortality. OBJECTIVES: To evaluate whether antihypertensive treatment inhibits LVH, restores beta-adrenergic response and affects myocardial oxidative metabolism. METHODS: Ninety spontaneously hypertensive rats (SHR) were distributed into groups and treated (mg/kg, p.o...
July 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28367863/ginsenoside-rb1-improves-cardiac-function-and-remodeling-in-heart-failure
#10
Xian Zheng, Shuai Wang, Xiaoming Zou, Yating Jing, Ronglai Yang, Siqi Li, Fengrong Wang
We investigated the effect of ginsenoside Rb1 on cardiac function and remodeling in heart failure (HF). Four weeks after HF induction, the rats were administrated with ginsenoside Rb1 (35 and 70 mg/kg) and losartan (4.5 mg/kg) for 8 weeks. Losartan was used as a positive control. Cardiac function was assessed by measuring hemodynamic parameters. Histological changes were analyzed by HE and Masson's trichrome staining. Cardiac hypertrophy, fibrosis, mitochondrial membrane potential and glucose transporter type 4 (GLUT4) levels were evaluated...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28355350/influence-of-antihypertensive-drugs-on-aortic-and-coronary-effects-of-ang-1-7-in-pressure-overloaded-rats
#11
A D C Nunes, A P S Souza, L M Macedo, P H Alves, G R Pedrino, D B Colugnati, E P Mendes, R A S Santos, C H Castro
This study investigated the influence of antihypertensive drugs, such as angiotensin-converting enzyme inhibitors (ACEIs), AT1 receptor blockers (ARBs), voltage-gated L-type calcium channel blockers, and mineralocorticoid receptor antagonists (MRAs), on the effects of angiotensin-(1-7) [Ang-(1-7)] on aorta and coronary arteries from pressure-overloaded rats. Pressure overload was induced by abdominal aortic banding (AB). To evaluate the role of antihypertensive drugs on the effect of Ang-(1-7), AB male Wistar rats weighing 250-300 g were treated with vehicle or low doses (5 mg·kg-1·day-1, gavage) of losartan, captopril, amlodipine, or spironolactone...
March 23, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28259714/protective-effect-of-losartan-and-ramipril-against-stress-induced-insulin-resistance-and-related-complications-anti-inflammatory-mechanisms
#12
Barinder Singh, Ashish Mourya, Sangeeta Pilkhwal Sah, Anil Kumar
Chronic restraint stress (CRS) is known to cause various behavioural and biochemical alterations, leading to several negative health outcomes. The present study was designed to explore the impact of inhibiting Renin angiotensin aldosterone system (RAAS) and inflammatory pathways in stress pathophysiology. In the present study, male LACA mice were subjected to restraint stress daily for 30 days. Losartan, nimesulide, ramipril, minocycline and their combinations were administered 45min prior to restraint stress daily and their effects were observed...
April 15, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27798092/igf-1-gh-axis-enhances-losartan-treatment-in-lama2-related-muscular-dystrophy
#13
Anthony Accorsi, Ajay Kumar, Younghwa Rhee, Alex Miller, Mahasweta Girgenrath
As the complexities of dystrophic pathology have been elucidated over the last few years, it has become increasingly clear that primary monogenetic defects result in multiple secondary pathologies capable of autonomously driving disease progression. Consequently, single-mode therapies fail to comprehensively ameliorate all aspects of pathology. Lama2-related muscular dystrophy (MDC1A) is a devastating congenital muscular dystrophy caused by mutations in the LAMA2 gene that results in multi-faceted secondary pathologies that include inflammation, fibrosis, apoptosis, and necrosis leading to severe muscle weakness and minimal postnatal growth...
October 24, 2016: Human Molecular Genetics
https://www.readbyqxmd.com/read/27713002/sex-differences-in-angiotensin-ii-responses-contribute-to-a-differential-regulation-of-cox-mediated-vascular-dysfunction-during-aging
#14
Gustavo Costa, Manel Garabito, Francesc Jiménez-Altayó, Yara Onetti, Manel Sabate, Elisabet Vila, Ana Paula Dantas
Aging is a cardiovascular risk factor partially related to activation of the Renin-Angiotensin System (RAS). RAS activation is also influenced by sex. In this regard, our study aims to determine whether sex-associated differences in RAS contribute to a differential regulation of vascular aging and associated dysfunction. Male and female outbreed CD-1 mice were studied at 3 and 12months of age (M). Contribution of RAS was determined by treating mice from 3M to 12M with the AngII type 1 receptor blocker losartan (0...
December 1, 2016: Experimental Gerontology
https://www.readbyqxmd.com/read/27560781/effects-of-single-and-combined-losartan-and-tempol-treatments-on-oxidative-stress-kidney-structure-and-function-in-spontaneously-hypertensive-rats-with-early-course-of-proteinuric-nephropathy
#15
Danijela Karanovic, Jelica Grujic-Milanovic, Zoran Miloradovic, Milan Ivanov, Djurdjica Jovovic, Una-Jovana Vajic, Maja Zivotic, Jasmina Markovic-Lipkovski, Nevena Mihailovic-Stanojevic
Oxidative stress has been widely implicated in both hypertension and chronic kidney disease (CKD). Hypertension is a major risk factor for CKD progression. In the present study we have investigated the effects of chronic single tempol (membrane-permeable radical scavenger) or losartan (angiotensin II type 1 receptor blocker) treatment, and their combination on systemic oxidative status (plasma thiobarbituric acid-reactive substances (pTBARS) production, plasma antioxidant capacity (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid, pABTS), erythrocyte antioxidant enzymes activities) and kidney oxidative stress (kTBARS, kABTS, kidney antioxidant enzymes activities), kidney function and structure in spontaneously hypertensive rats (SHR) with the early course of adriamycin-induced nephropathy...
2016: PloS One
https://www.readbyqxmd.com/read/27432866/spironolactone-prevents-endothelial-nitric-oxide-synthase-uncoupling-and-vascular-dysfunction-induced-by-%C3%AE-adrenergic-overstimulation-role-of-perivascular-adipose-tissue
#16
Jamaira A Victorio, Stefano P Clerici, Roberto Palacios, María J Alonso, Dalton V Vassallo, Iris Z Jaffe, Luciana V Rossoni, Ana P Davel
Sustained stimulation of β-adrenoceptors (β-ARs) and activation of renin-angiotensin-aldosterone system are common features of cardiovascular diseases with rising sympathetic activation, including essential hypertension, myocardial infarction, and heart failure. In this study, we investigated the role of AT1 receptor and mineralocorticoid receptor (MR) in the vascular alterations caused by β-AR overstimulation. β-AR overstimulation with associated cardiac hypertrophy and increased vasoconstrictor response to phenylephrine in aorta were modeled in rats by 7-day isoproterenol treatment...
September 2016: Hypertension
https://www.readbyqxmd.com/read/27389178/losartan-improves-cerebrovascular-function-in-a-mouse-model-of-alzheimer-s-disease-with-combined-overproduction-of-amyloid-%C3%AE-and-transforming-growth-factor-%C3%AE-1
#17
Panayiota Papadopoulos, Xin-Kang Tong, Hans Imboden, Edith Hamel
Alterations of the renin-angiotensin system have been implicated in the pathogenesis of Alzheimer's disease. We tested the efficacy of losartan (10 mg/kg/day for three months), a selective angiotensin II type 1 receptor antagonist, in alleviating cerebrovascular and cognitive deficits in double-transgenic mice (six months at endpoint) that overexpress a mutated form of the human amyloid precursor protein (APPSwe,Ind) and a constitutively active form of the transforming growth factor-β1, thereafter named A/T mice...
June 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27359284/biological-therapies-for-cartilage-lesions-in-the-hip-a-new-horizon
#18
REVIEW
Jorge Chahla, Robert F LaPrade, Rodrigo Mardones, Johnny Huard, Marc J Philippon, Shane Nho, Omer Mei-Dan, Cecilia Pascual-Garrido
Treatment of hip cartilage disease is challenging, and there is no clear algorithm to address this entity. Biomarkers are arising as promising diagnostic tools because they could play a role in the early assessment of the prearthritic joint and as a prognostic factor before and after treatment. The potential effect of biomarkers may be used to categorize individuals at risk of evolving to severe osteoarthritis, to develop new measures for clinical progression of the disease, and to develop new treatment options for the prevention of osteoarthritis progression...
July 1, 2016: Orthopedics
https://www.readbyqxmd.com/read/27051236/angiotensin-ii-modulates-p130cas-of-podocytes-by-the-suppression-of-amp-activated-protein-kinase
#19
Tae-Sun Ha, Hye-Young Park, Su-Bin Seong, Hee-Yul Ahn
Angiotensin II (Ang II) induces the pathological process of vascular structures, including renal glomeruli by hemodynamic and nonhemodynamic direct effects. In kidneys, Ang II plays an important role in the development of proteinuria by the modification of podocyte molecules. We have previously found that Ang II suppressed podocyte AMP-activated protein kinase (AMPK) via Ang II type 1 receptor and MAPK signaling pathway. In the present study, we investigated the roles of AMPK on the changes of p130Cas of podocyte by Ang II...
April 2016: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/27012991/comparison-of-the-effects-of-levocetirizine-and-losartan-on-diabetic-nephropathy-and-vascular-dysfunction-in-streptozotocin-induced-diabetic-rats
#20
COMPARATIVE STUDY
Hanan S Anbar, George S G Shehatou, Ghada M Suddek, Nariman M Gameil
This work was designed to investigate the effects of levocetirizine, a histamine H1 receptor antagonist, on diabetes-induced nephropathy and vascular disorder, in comparison to an angiotensin II receptor antagonist, losartan. Diabetes was induced in male Sprague Dawley rats by a single intraperitoneal injection of streptozotocin (50mg/kg). Diabetic rats were divided into three groups; diabetic, diabetic-levocetirizine (0.5mg/kg/day) and diabetic-losartan (25mg/kg/day). Treatments were started two weeks following diabetes induction and continued for additional eight weeks...
June 5, 2016: European Journal of Pharmacology
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