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Nancy N Shahin, Noha F Abdelkader, Marwa M Safar
The advent of angiotensin II type 1 receptor blockers (ARBs) as intriguing gastroprotective candidates and the superior pharmacokinetics and pharmacodynamics displayed by irbesartan compared to many other ARBs raised the interest to investigate its gastroprotective potential in a rat model of gastric injury. Irbesartan (50 mg/Kg) was orally administered to male Wistar rats once daily for 14 days; thereafter gastric injury was induced by indomethacin (60 mg/Kg, p.o). Irbesartan reduced gastric ulcer index, gastric acidity, and ameliorated indomethacin-induced gastric mucosal apoptotic and inflammatory aberrations, as demonstrated by hampering caspase-3, prostaglandin E2 and tumor necrosis factor-alpha levels and cyclooxygenase-2 mRNA expression...
March 9, 2018: Scientific Reports
Tracy Bell, Magali Araujo, Zaiming Luo, James Tomlinson, James Leiper, William J Welch, Christopher S Wilcox
BACKGROUND: Nitric oxide prevents hypertension yet paradoxically reduces proximal tubule Na+ reabsorption. Nitric oxide synthase is inhibited by asymmetric dimethylarginine (ADMA) that is metabolized by dimethylarginine dimethylaminohydrolase (DDAH) whose type 1 isoform is expressed abundantly in the PT. HYPOTHESIS: That ADMA generated by DDAH-1 fluid reabsorbtion (Jv) by the proximal tubule. METHODS: S2 segments of the PT were perfused in vivo to assess Jv...
March 7, 2018: American Journal of Physiology. Renal Physiology
S Tommasi, D J Elliot, M Da Boit, S R Gray, B C Lewis, A A Mangoni
The inhibition of arginase, resulting in higher arginine (ARG) availability for nitric oxide synthesis, may account for the putative protective effect of homoarginine (HOMOARG) against atherosclerosis and cardiovascular disease. However, uncertainty exists regarding the significance of HOMOARG-induced arginase inhibition in vivo. A novel UPLC-MS method, measuring the conversion of ARG to ornithine (ORN), was developed to determine arginase 1 and arginase 2 inhibition by HOMOARG, lysine (LYS), proline (PRO), agmatine (AG), asymmetric dimethylarginine (ADMA), symmetric dimethylarginine (SDMA), and NG-Monomethyl-L-arginine (L-NMMA)...
February 27, 2018: Scientific Reports
Anne Marie Voigt Schou-Pedersen, Jens Lykkesfeldt
Increased asymmetric dimethylarginine (ADMA) in human plasma has been associated with reduced generation of nitric oxide, leading to atherosclerotic diseases. ADMA may therefore be an important biomarker for cardiovascular disease. In the present study, three sample preparation techniques were compared regarding the quantification of L-arginine and ADMA in human plasma: (A) protein precipitation (PP) based on aqueous trichloroacetic acid (TCA), (B) PP using a mixture of ammonia and acetonitrile, and (C) solid-phase extraction (SPE)...
2018: Journal of Analytical Methods in Chemistry
Mark McEvoy, David C Harris, Arduino A Mangoni, Julia Z Sarant
OBJECTIVE: Age-related hearing loss is associated with endothelial dysfunction and increased cardiovascular risk, suggesting a vascular etiology. Methylarginines are endogenous nitric oxide synthase inhibitors that cause endothelial dysfunction and increase cardiovascular disease risk. This study is the first to examine the hypothesis that higher serum concentrations of methylarginines are associated with greater hearing loss prevalence. STUDY DESIGN/PATIENTS: Cross-sectional audiometric data on hearing levels, and serum methylarginines were collected from a population-based sample of 630 older community-dwelling adults...
February 23, 2018: Otology & Neurotology
Carlee D Ruediger, Bobby John, Sathesh Kumar, Han S Lim, Geetanjali Rangnekar, Kurt C Roberts-Thomson, Glenn D Young, David Chase, Prashanthan Sanders, Scott R Willoughby
BACKGROUND: It has been suggested that ethnicity can make a significant difference to the likelihood of thromboembolic stroke related to atrial fibrillation. Ethnic differences have been shown to alter inflammatory and haemostatic factors; however, this may all be confounded by differences in cardiovascular risk factors between different ethnicity. The impact of different ethnicities on the thrombogenic profile is not known. The aim of this study was to investigate differences in markers of inflammation, endothelial function and tissue remodelling between Caucasian and Indian populations with supraventricular tachycardia (SVT)...
January 2018: Indian Pacing and Electrophysiology Journal
Cem Haymana, Aydogan Aydogdu, Ibrahim Demirci, Mustafa Dinc, Orhan Demir, Deniz Torun, Fatih Yesildal, Coskun Meric, Yalcın Basaran, Alper Sonmez, Omer Azal
Patients with Klinefelter Syndrome (KS) have increased cardiometabolic risk however the pathogenesis is not clear. We investigated the presence of endothelial dysfunction, insulin resistance and inflammation in an unconfounded population of KS. A total of 32 patients with KS (mean age 21.59 ± 1.66 years) and 33 healthy control subjects (mean age: 22.15 ± 1.03 years) were enrolled. The demographic parameters, Asymmetric dimethylarginine (ADMA), homeostatic model assessment of insulin resistance (HOMA-IR) index and high-sensitivity C-reactive protein (hs-CRP) levels were measured...
February 19, 2018: Endocrine, Metabolic & Immune Disorders Drug Targets
Eugenia Gkaliagkousi, Eleni Gavriilaki, Areti Triantafyllou, Barbara Nikolaidou, Panagiota Anyfanti, Nikolaos Koletsos, Anastasios Vamvakis, Konstantina Dipla, Antonios Lazaridis, Stella Douma
Asymmetric dimethylarginine (ADMA) is a robust marker of endothelial dysfunction in patients with essential hypertension. We investigated ADMA levels and their association with vascular damage in untreated hypertension. We enrolled consecutive patients with untreated, recently diagnosed hypertension and age-matched normotensive individuals. 24-hour blood pressure, central hemodynamics, and arterial stiffness were recorded. A total of 311 individuals were studied: 165 with essential hypertension, 50 with masked hypertension, 25 with white-coat hypertension, and 71 normotensive individuals...
February 15, 2018: Journal of Clinical Hypertension
Yun-En Liu, Cang-Ci Tong, Yu-Biao Zhang, Pei-Fang Cong, Xiu-Yun Shi, Ying Liu, Lin Shi, Zhou Tong, Hong-Xu Jin, Ming-Xiao Hou
OBJECTIVE: To investigate the protective effect of chitosan oligosaccharide (COS) on acute lung injury (ALI) caused by blast injury, and explore possible molecular mechanisms. METHODS: A mouse model of blast injury-induced ALI was established using a self-made explosive device. Thirty mice were randomly assigned to control, ALI and ALI + COS groups. An eight-channel physiological monitor was used to determine the mouse physiological index. Enzyme linked immunosorbent assay was used to measure serum inflammatory factors...
2018: PloS One
Cristina B Triches, Marie Quinto, Saurus Mayer, Marcelo Batista, Maria Teresa Zanella
AIM: The aim of the study was to evaluate the association between high plasma ADMA levels, a biomarker of endothelial dysfunction, with the progression of albuminuria and chronic kidney disease (CKD) in hypertensive patients, with and without type 2 diabetes mellitus. METHODS: We successfully contacted 213 of 644 patients who had been evaluated between 2004 and 2005 and for whom basal data were available. After the exclusion of 51 patients, 162 hypertensive patients who were free from albuminuria were stratified into the following 4 groups according to the presence of diabetes and plasma ADMA percentiles: general hypertensive patients with high levels of plasma ADMA (>P4 or ADMA > 0...
December 21, 2017: Journal of Diabetes and its Complications
Fang Wang, Ruifang Xiong, Sujuan Feng, Xiangxue Lu, Han Li, Shixiang Wang
BACKGROUND/AIMS: The incidence of cardiovascular disease in patients with chronic kidney disease (CKD) is significantly higher than that in the general population. Carotid intima-media thickness (CIMT) is considered to be an important predictor of atherosclerosis. Asymmetric dimethylarginine (ADMA) acted as an endogenous nitric oxide synthase inhibitor, which was elevated in patients with CKD, but whether plasma ADMA correlate with the CIMT in CKD patients is still not elucidated. METHODS: We searched the PubMed, Cochrane Library and Embase electronic database...
January 23, 2018: Kidney & Blood Pressure Research
Woojung Lee, Hyo Jung Lee, Han Byul Jang, Hyo-Jin Kim, Hyo-Jeong Ban, Kwang Youl Kim, Moon Suk Nam, Joo Sun Choi, Kyung-Tae Lee, Seong Beom Cho, Sang Ick Park, Hye-Ja Lee
To unravel metabolic determinats of insulin resistance, we performed a targeted metabolomics analysis in Korean Children-Adolescent Cohort Study (KoCAS, n = 430). Sixty-seven metabolites were associated with insulin resistance in adolescents and the association also found in an adult population (KoGES, n = 2,485). Functional interactions of metabolites with gene/proteins using biological pathway with insulin resistance were not identified biological significance and regulatory effects of asymmetric dimethylarginine (ADMA)...
February 1, 2018: Scientific Reports
Mei-Hsin Hsu, Yu-Chieh Chen, Jiunn-Ming Sheen, Shih-Wen Li, Li-Tung Huang
Bile duct ligation (BDL) in young rats can cause impaired liver function and cognition deficits. Nitric oxide is implicated in hepatic encephalopathy and is also involved in cognition. In this study, we examined the role of brain asymmetric dimethylarginine (ADMA), an endogenous nitric oxide synthase inhibitor, in young BDL rats with spatial deficits. Young male Sprague-Dawley rats aged 17 days were assigned to four groups: laparotomy (SHAM), laparotomy plus 5 mg melatonin delivered through a pellet (SHAMM) for 4 weeks, BDL for 4 weeks, and BDL plus 5 mg melatonin delivered through a pellet (BDLM) for 4 weeks...
January 30, 2018: Neuroreport
Shalini Jamwal, Saurabh Sharma
AIM: Vascular endothelium plays a role in capillary transport of nutrients and drugs and regulates angiogenesis, homeostasis, as well as vascular tone and permeability as a major regulator of local vascular homeostasis. The present study has been designed to investigate the role of endothelium in metabolic disorders. METHODS: The endothelium maintains the balance between vasodilatation and vasoconstriction, procoagulant and anticoagulant, prothrombotic and antithrombotic mechanisms...
January 25, 2018: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
Mao-Hung Lo, I-Chun Lin, Pei-Chen Lu, Chien-Fu Huang, Shao-Ju Chien, Kai-Sheng Hsieh, You-Lin Tain
BACKGROUND/PURPOSE: To investigate the correlations among endothelial function assessment parameters, asymmetric dimethylarginine (ADMA)-related biomarkers, and traditional risk factors in adipose children. METHODS: We enrolled adipose children aged 7-18 years between July 2014 and August 2016 as well as normal-weight controls from the outpatient clinic. Vascular measurements including echocardiography, carotid intima media thickness, pulse wave velocity (PWV), and flow-mediated dilation (FMD) were measured...
January 17, 2018: Journal of the Formosan Medical Association, Taiwan Yi Zhi
Andrea Ferrigno, Laura Giuseppina Di Pasqua, Clarissa Berardo, Veronica Siciliano, Vittoria Rizzo, Luciano Adorini, Plinio Richelmi, Mariapia Vairetti
BACKGROUND: We previously showed that increased asymmetric dimethylarginine (ADMA) biliary excretion occurs during hepatic ischemia/reperfusion (I/R), prompting us to study the effects of the farnesoid X receptor (FXR) agonist obeticholic acid (OCA) on bile, serum and tissue levels of ADMA after I/R. MATERIAL AND METHODS: Male Wistar rats were orally administered 10mg/kg/day of OCA or vehicle for 5 days and were subjected to 60 min partial hepatic ischemia or sham-operated...
2018: PloS One
Raymond Vanholder, Anneleen Pletinck, Eva Schepers, Griet Glorieux
In this narrative review, the biological/biochemical impact (toxicity) of a large array of known individual uremic retention solutes and groups of solutes is summarized. We classified these compounds along their physico-chemical characteristics as small water-soluble compounds or groups, protein bound compounds and middle molecules. All but one solute (glomerulopressin) affected at least one mechanism with the potential to contribute to the uremic syndrome. In general, several mechanisms were influenced for each individual solute or group of solutes, with some impacting up to 7 different biological systems of the 11 considered...
January 8, 2018: Toxins
Gabor Tajti, Csaba Papp, Laszlo Kardos, Sandor Keki, Krisztian Pak, Magdolna Emma Szilasi, Rudolf Gesztelyi, Angela Mikaczo, Andrea Fodor, Maria Szilasi, Judit Zsuga
Background: Contribution of nitric-oxide (NO) pathway to the pathogenesis of bronchial asthma (asthma) is ambiguous as NO may confer both protective and detrimental effects depending on the NO synthase (NOS) isoforms, tissue compartments and underlying pathological conditions (e.g. systemic inflammation). Asymmetric dimethylarginine (ADMA) is an endogenous inhibitor and uncoupler of NOS with distinct selectivity for NOS isoforms. In a cross-sectional study, we assessed whether ADMA is an independent predictor of airway resistance (Raw) in therapy-controlled asthma...
2018: Allergy, Asthma, and Clinical Immunology
Dimitrios Tsikas, Alexander Bollenbach, Erik Hanff, Arslan Arinc Kayacelebi
NG-Methylation of L-arginine (Arg) residues in certain proteins by protein arginine methyltransferases and subsequent proteolysis yields NG-monomethyl-L-arginine (MMA), NG,NG-dimethyl-L-arginine (asymmetric dimethylarginine, ADMA) and NG,N'G-dimethyl-L-arginine (symmetric dimethylarginine, SDMA). Biological MMA, ADMA and SDMA occur as free acids in the nM-range and as residues of proteins of largely unknown quantity. Arginine:glycine amidinotransferase (AGAT) catalyzes the synthesis of L-homoarginine (hArg) from free Arg and L-lysine...
January 4, 2018: Cardiovascular Diabetology
Anna Rzepecka-Stojko, Jerzy Stojko, Krzysztof Jasik, Ewa Buszman
The aim of this study was to determine the effect of polyphenol-rich ethanol extract of bee pollen (EEP) on atherosclerosis induced by a high-fat diet in ApoE-knockout mice. EEP was given with feed in two doses of 0.1 and 1 g/kg body mass (BM). The studies have been conducted in a period of 16 weeks. The following factors were estimated: total cholesterol (TC), oxidized low density lipoproteins (ox-LDL), asymmetric dimethylarginine (ADMA), angiotensin-converting enzyme (ACE) and angiotensin II (ANG II) in the 5th, 10th, 12th, 14th, and 16th week of the experiment...
December 18, 2017: Nutrients
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