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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
#1
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 wild-type mice...
May 5, 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
#2
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...
April 22, 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
#3
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
#4
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...
March 27, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28367863/ginsenoside-rb1-improves-cardiac-function-and-remodeling-in-heart-failure
#5
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...
March 30, 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
#6
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
#7
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
#8
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
#9
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...
October 3, 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
#10
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
#11
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
#12
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...
January 1, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27359284/biological-therapies-for-cartilage-lesions-in-the-hip-a-new-horizon
#13
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
#14
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
#15
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
https://www.readbyqxmd.com/read/27011384/histamine-h3-receptor-agonist-imetit-attenuated-isoproterenol-induced-renin-angiotensin-system-and-sympathetic-nervous-system-overactivity-in-myocardial-infarction-of-rats
#16
C Hass, B P Panda, R Khanam, A K Najmi, M Akhtar
BACKGROUND: Myocardial infarction is an alarming health issue, needs great attention. The present study investigated the role of histamine-H3 receptor (H3R) agonist imetit in relationship to sympathetic and renin angiotensin system in Wistar rats. MATERIALS AND METHODS: Subcutaneous injection of isoproterenol (85 mg/kg) on last 2 consecutive days in per se group and 7 days treatment of different groups at 24 h interval induced myocardial infarction in Wistar rats...
June 2016: Drug Research
https://www.readbyqxmd.com/read/26909689/effects-of-uric-acid-on-the-no-production-of-huvecs-and-its-restoration-by-urate-lowering-agents
#17
M Mishima, T Hamada, N Maharani, N Ikeda, T Onohara, T Notsu, H Ninomiya, S Miyazaki, E Mizuta, S Sugihara, M Kato, K Ogino, M Kuwabara, Y Hirota, A Yoshida, N Otani, N Anzai, I Hisatome
BACKGROUND: Although urate impaired the endothelial function, its underlying mechanism remains unknown. We hypothesized that urate impaired nitric oxide (NO) production in human umbilical vein endothelial cells (HUVECs) via activation of uric acid transporters (UATs). PURPOSE AND METHOD: In the present study, we studied effects of urate on NO production and eNOS protein expression in HUVEC cells in the presence and absence of urate lowering agents using molecular biological and biochemical assays...
May 2016: Drug Research
https://www.readbyqxmd.com/read/26781276/low-salt-diet-and-circadian-dysfunction-synergize-to-induce-angiotensin-ii-dependent-hypertension-in-mice
#18
Paramita Pati, David J R Fulton, Zsolt Bagi, Feng Chen, Yusi Wang, Julia Kitchens, Lisa A Cassis, David W Stepp, R Daniel Rudic
Blood pressure exhibits a robust circadian rhythm in health. In hypertension, sleep apnea, and even shift work, this balanced rhythm is perturbed via elevations in night-time blood pressure, inflicting silent damage to the vasculature and body organs. Herein, we examined the influence of circadian dysfunction during experimental hypertension in mice. Using radiotelemetry to measure ambulatory blood pressure and activity, the effects of angiotensin II administration were studied in wild-type (WT) and period isoform knockout (KO) mice (Per2-KO, Per2, 3-KO, and Per1, 2, 3-KO/Per triple KO [TKO] mice)...
March 2016: Hypertension
https://www.readbyqxmd.com/read/26509589/at1-receptor-antagonism-before-ischemia-prevents-the-transition-of-acute-kidney-injury-to-chronic-kidney-disease
#19
Roxana Rodríguez-Romo, Kenia Benítez, Jonatan Barrera-Chimal, Rosalba Pérez-Villalva, Arturo Gómez, Diana Aguilar-León, Jesús F Rangel-Santiago, Sara Huerta, Gerardo Gamba, Norma Uribe, Norma A Bobadilla
Despite clinical recovery of patients from an episode of acute kidney injury (AKI), progression to chronic kidney disease (CKD) is possible on long-term follow-up. However, mechanisms of this are poorly understood. Here, we determine whether activation of angiotensin-II type 1 receptors during AKI triggers maladaptive mechanisms that lead to CKD. Nine months after AKI, male Wistar rats develop CKD characterized by renal dysfunction, proteinuria, renal hypertrophy, glomerulosclerosis, tubular atrophy, and tubulointerstitial fibrosis...
February 2016: Kidney International
https://www.readbyqxmd.com/read/26455386/telmisartan-attenuates-hyperglycemia-exacerbated-vcam-1-expression-and-monocytes-adhesion-in-tnf%C3%AE-stimulated-endothelial-cells-by-inhibiting-ikk%C3%AE-expression
#20
Kee-Ho Song, Jung-Hyun Park, Inho Jo, Joong-Yeol Park, Jungwon Seo, Soon Ae Kim, Du-Hyong Cho
Uncontrolled hyperglycemia accelerates endothelial damage and vascular inflammation caused by proinflammatory cytokines including tumor necrosis factor α (TNFα), which leads to arteriosclerotic cardiovascular diseases such as myocardial infarction. Telmisartan, an angiotensin II type 1 receptor blocker (ARB), is prescribed for treatment of hypertensive patients with concurrent diabetes mellitus (DM). Although a few clinical trials have suggested that telmisartan decreases cardiovascular complications in diabetic patients, the molecular mechanism for the beneficial effects remains elusive...
March 2016: Vascular Pharmacology
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