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Nitric oxide AND citrulline

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https://www.readbyqxmd.com/read/29648475/alterations-in-plasma-l-arginine-and-methylarginines-in-heart-failure-and-after-heart-transplantation
#1
Jakob Lundgren, Anna Sandqvist, Mikael Hedeland, Ulf Bondesson, Gerhard Wikström, Göran Rådegran
OBJECTIVE: Endothelial function, including the nitric oxide (NO)-pathway, has previously been extensively investigated in heart failure (HF). In contrast, studies are lacking on the NO pathway after heart transplantation (HT). We therefore investigated substances in the NO pathway prior to and after HT in relation to hemodynamic parameters. DESIGN: 12 patients (median age 50.0 yrs, 2 females), heart transplanted between June 2012 and February 2014, evaluated at our hemodynamic lab, at rest, prior to HT, as well as four weeks and six months after HT were included...
April 12, 2018: Scandinavian Cardiovascular Journal: SCJ
https://www.readbyqxmd.com/read/29551532/effect-of-ginger-paullinia-cupana-muira-puama-and-l-citrulline-singly-or-in-combination-on-modulation-of-the-inducible-nitric-oxide-no-cgmp-pathway-in-rat-penile-smooth-muscle-cells
#2
Monica G Ferrini, Eduardo Garcia, Andrea Abraham, Jorge N Artaza, Sabine Nguyen, Jacob Rajfer
INTRODUCTION: COMP-4 is a natural compound-based dietary supplement consisting of the combination of ginger, Paullinia cupana, muira puama and l-citrulline, which when given long-term has been shown in the aged rat to a) upregulate iNOS in the penile smooth muscle cells (SMC), b) reverse the corporal SMC apoptosis and fibrosis associated with corporal veno-occlusive dysfunction (CVOD), and c) improve resulting erectile function. To elucidate the mechanism of how COMP-4 and its individual components modulate the iNOS-cGMP pathway, an in vitro study was conducted using a rat corporal primary SMC culture to determine its effect on NOS, soluble guanylate cyclase (sGC), cGMP and the phosphodiesterase 5 enzyme (PDE5)...
March 15, 2018: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/29548623/ready-to-use-food-supplement-with-or-without-arginine-and-citrulline-with-daily-chloroquine-in-tanzanian-children-with-sickle-cell-disease-a-double-blind-random-order-crossover-trial
#3
Sharon E Cox, Elizabeth A Ellins, Alphonce I Marealle, Charles R Newton, Deogratias Soka, Philip Sasi, Gian Luca Di Tanna, William Johnson, Julie Makani, Andrew M Prentice, Julian P Halcox, Fenella J Kirkham
BACKGROUND: Sickle-cell disease increases the risk of malnutrition. Low arginine and nitric oxide bioavailability are implicated in morbidity related to sickle-cell disease. Simple interventions are required, especially in low-income settings. We aimed to test the hypotheses that: (1) supplementary arginine, citrulline, and daily chloroquine increase bioavailable arginine and flow-mediated dilatation (FMD; maximal diameter change; FMDmax %), a measure of nitric oxide-dependent endothelial function; and (2) protein energy supplementation in the form of ready-to-use supplementary food (RUSF) improves the height-for-age and body-mass index-for-age Z-scores in children with sickle-cell disease...
March 13, 2018: Lancet Haematology
https://www.readbyqxmd.com/read/29543135/one-week-cf-intake-increases-prefrontal-cortex-oxygenation-at-rest-and-during-moderate-intensity-exercise-in-normoxia-and-hypoxia
#4
Lieselot Decroix, Cajsa Tonoli, Elodie Lespagnol, Constantino Balestra, Amandine Descat, Marie Jose Drittij-Reijnders, Jamie R Blackwell, Wilhelm Stahl, Andrew M Jones, Antje R Weseler, Aalt Bast, Romain Meeusen, Elsa Heyman
INTRODUCTION: During exercise in hypoxia, O2 delivery to brain and muscle is compromised and oxidative stress is elicited. Cocoa flavanols (CF) have antioxidant capacities and can increase blood flow by stimulating endothelial function. We aimed to examine the effects of 7-day CF intake on oxidative stress, nitric oxide production and tissue oxygenation in response to exercise in hypoxia (14.3% O2 ). METHODS: In a randomized, double blind, cross-over study, 14 well-trained male cyclists completed 4 trials: exercise in normoxia or hypoxia, after 7-day CF or placebo intake...
March 15, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29478971/kidney-mass-reduction-leads-to-l-arginine-metabolism-dependent-blood-pressure-increase-in-mice
#5
Samyuktha Muralidharan Pillai, Petra Seebeck, Ralph Fingerhut, Ji Huang, Xiu-Fen Ming, Zhihong Yang, François Verrey
BACKGROUND: Uninephrectomy (UNX) is performed for various reasons, including kidney cancer or donation. Kidneys being the main site of l-arginine production in the body, we tested whether UNX mediated kidney mass reduction impacts l-arginine metabolism and thereby nitric oxide production and blood pressure regulation in mice. METHODS AND RESULTS: In a first series of experiments, we observed a significant increase in arterial blood pressure 8 days post-UNX in female and not in male mice...
February 25, 2018: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29460801/effects-of-glucocorticoids-on-serum-amino-acid-levels-during-cardiac-surgery-in-children
#6
Annelies van Zwol, Neelke B C Oosterloo, Cartijn T de Betue, Ad Bogers, Inge I de Liefde, Nicolaas E P Deutz, Koen F M Joosten
BACKGROUND AND AIMS: Children undergoing cardiac surgery with cardio pulmonary bypass often receive glucocorticoids to reduce the systemic inflammatory response. Glucocorticoids stimulate protein breakdown and increase amino acid availability. We studied whether glucocorticoid treatment influences the availability of amino acids, specifically those involved in the nitric oxide pathway. METHODS: We prospectively studied 49 children with congenital heart disease undergoing cardiac surgery...
February 2018: Clinical Nutrition ESPEN
https://www.readbyqxmd.com/read/29459031/subcellular-targeting-of-nitric-oxide-synthases-mediated-by-their-n-terminal-motifs
#7
Carlos Costas-Insua, Javier Merino-Gracia, Clara Aicart-Ramos, Ignacio Rodríguez-Crespo
From a catalytic point of view, the three mammalian nitric oxide synthases (NOSs) function in an almost identical way. The N-terminal oxygenase domain catalyzes the conversion of l-arginine to l-citrulline plus ·NO in two sequential oxidation steps. Once l-arginine binds to the active site positioned above the heme moiety, two consecutive monooxygenation reactions take place. In the first step, l-arginine is hydroxylated to make Nω-hydroxy-l-arginine in a process that requires 1 molecule of NADPH and 1 molecule of O2 per mol of l-arginine reacted...
2018: Advances in Protein Chemistry and Structural Biology
https://www.readbyqxmd.com/read/29450408/effect-of-arginase-1-inhibition-on-the-incidence-of-autoimmune-diabetes-in-nod-mice
#8
Luis F Hernandez, Peter Buchwald, Midhat H Abdulreda
Metabolism of the amino acid L-arginine is implicated in many physiological and pathophysiological processes including autoimmune conditions such as type 1 diabetes (T1D). Alternate arginine metabolism through the citrulline-nitric oxide (NO) or the ornithine pathways can lead to proinflammatory or immune regulatory effects, respectively. In this report, we blocked the arginine-ornithine metabolic pathway by inhibiting the enzyme arginase-1 with Nω-hydroxy-nor-arginine (nor-NOHA) to make arginine more available to the alternate citrulline pathway for augmented NO production and increased incidence of autoimmune T1D in female non-obese diabetic (NOD) mice...
January 2018: Current Research in Diabetes & Obesity Journal
https://www.readbyqxmd.com/read/29439324/altered-expression-of-urea-cycle-enzymes-in-amyloid-%C3%AE-protein-precursor-overexpressing-pc12-cells-and-in-sporadic-alzheimer-s-disease-brain
#9
Henryk Jęśko, Walter J Lukiw, Anna Wilkaniec, Magdalena Cieślik, Magdalena Gąssowska-Dobrowolska, Emilia Murawska, Wojciech Hilgier, Agata Adamczyk
Urea cycle enzymes may play important yet poorly characterized roles in Alzheimer's disease (AD). Our previous results showed that amyloid-β (Aβ) affects urea cycle enzymes in rat pheochromocytoma (PC12) cells. The aim of the present study was to investigate the changes in arginases, other urea cycle enzymes, and nitric oxide synthases (NOSs) in PC12 cells transfected with AβPP bearing the double 'Swedish' mutation (APPsw, K670M/N671L) and in postmortem sporadic AD brain hippocampus; the mutation intensifies Aβ production and strongly associates with AD neuropathology...
2018: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29428506/8-year-retrospective-analysis-of-intravenous-arginine-therapy-for-acute-metabolic-strokes-in-pediatric-mitochondrial-disease
#10
Rebecca D Ganetzky, Marni J Falk
BACKGROUND: Intravenous (IV) arginine has been reported to ameliorate acute metabolic stroke symptoms in adult patients with Mitochondrial Encephalopathy with Lactic Acidosis and Stroke-like Episodes (MELAS) syndrome, where its therapeutic benefit is postulated to result from arginine acting as a nitric oxide donor to reverse vasospasm. Further, reduced plasma arginine may occur in mitochondrial disease since the biosynthesis of arginine's precursor, citrulline, requires ATP. Metabolic strokes occur across a wide array of primary mitochondrial diseases having diverse molecular etiologies that are likely to share similar pathophysiologic mechanisms...
February 2, 2018: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/29415069/administration-of-l-arginine-plus-l-citrulline-or-l-citrulline-alone-successfully-retarded-endothelial-senescence
#11
Tomoe Tsuboi, Morihiko Maeda, Toshio Hayashi
L-citrulline and L-arginine supplementation has been shown to have several beneficial effects on the cardiovascular system. Nitric oxide (NO) protects against the progression of atherosclerosis and is synthesized by nitric oxide synthase (NOS), which converts L-arginine (L-Arg) into L-citrulline (L-Cit). Our previous study revealed that chronic administration of a combination of L-Cit and L- Arg has a better therapeutic effect on high cholesterol-induced atherosclerosis in rabbits. We investigated how L-Arg and L-Cit affect endothelial function, aging and atherosclerosis...
2018: PloS One
https://www.readbyqxmd.com/read/29337988/l-arginine-supplementation-reduces-mortality-and-improves-disease-outcome-in-mice-infected-with-trypanosoma-cruzi
#12
Sofía Carbajosa, Héctor O Rodríguez-Angulo, Susana Gea, Carlos Chillón-Marinas, Cristina Poveda, María C Maza, Diana Colombet, Manuel Fresno, Núria Gironès
Chagas disease caused by Trypanosoma cruzi is a neglected disease that affects about 7 million people in Latin America, recently emerging on other continents due to migration. As infection in mice is characterized by depletion of plasma L-arginine, the effect on infection outcome was tested in mice with or without L-arginine supplementation and treatment with 1400W, a specific inhibitor of inducible nitric oxide synthase (iNOS). We found that levels of L-arginine and citrulline were reduced in the heart and plasma of infected mice, whereas levels of asymmetric dimethylarginine, an endogenous iNOS inhibitor, were higher...
January 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29337196/nicorandil-and-theophylline-can-protect-experimental-rats-against-complete-freund-s-adjuvant-induced-rheumatoid-arthritis-through-modulation-of-jak-stat-rankl-signaling-pathway
#13
Ahmed Gaafar Ahmed Gaafar, Basim Anwar Shehata Messiha, Ahmed Mohamed Labib Abdelkafy
Signaling pathways are interesting fields of study of pathogenesis and treatment trials. We elucidated the possible protective effects of nicorandil (15mg/kg/day) and theophylline (20mg/kg/day) on experimentally-induced RA, focusing on the role of JAK (Janus Kinase) / STAT (Signal Transducer and Activator of Transcription) / RANKL (Receptor Activator of Nuclear factor-Kappa B Ligand) / cytokine signaling pathway. Four sets of experiments were performed. First, effect of test agents on normal animals was evaluated...
March 5, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29305240/a-pilot-study-of-a-non-invasive-oral-nitrate-stable-isotopic-method-suggests-that-arginine-and-citrulline-supplementation-increases-whole-body-no-production-in-tanzanian-children-with-sickle-cell-disease
#14
Alphonce I Marealle, Mario Siervo, Sara Wassel, Les Bluck, Andrew M Prentice, Omary Minzi, Philip Sasi, Appolinary Kamuhabwa, Deogratias Soka, Julie Makani, Sharon E Cox
BACKGROUND: Low bioavailability of nitric oxide (NO) is implicated in the pathophysiology of sickle cell disease (SCD). We designed a nested pilot study to be conducted within a clinical trial testing the effects of a daily ready-to-use supplementary food (RUSF) fortified with arginine (Arg) and citrulline (Citr) vs. non-fortified RUSF in children with SCD. The pilot study evaluated 1) the feasibility of a non-invasive stable isotope method to measure whole-body NO production and 2) whether Arg+Citr supplementation was associated with increased whole-body NO production...
April 1, 2018: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/29286527/experience-of-correcting-endothelial-dysfunction-in-children-residents-of-radioactively-contaminated-areas-by-nitric-oxide-potential-donator-citrulline
#15
Ye I Stepanova, I Ye Kolpakov, V M Zygalo, V Yu Vdovenko, V H Kondrashova, O S Leonovich, V V Kryzhanivska
OBJECTIVE: to determine the effectiveness of citrulline use for correcting endothelial dysfunction in children resi dents of radioactively contaminated areas. MATERIALS AND METHODS: A group of children residents of radioactively contaminated areas with the presence of clinical and paraclinical signs of endothelial dysfunction was selected to assess the effectiveness of correcting endothelial dysfunction by the usage of NO potential donator - citrulline according to the data of selective screen ing...
December 2017: Problemy Radiat︠s︡iĭnoï Medyt︠s︡yny Ta Radiobiolohiï
https://www.readbyqxmd.com/read/29168320/pulmonary-hypertension-in-the-premature-infant-population-analysis-of-echocardiographic-findings-and-biomarkers
#16
Michael G O'Connor, Divya Suthar, Kimberly Vera, James C Slaughter, Natalie L Maitre, Steven Steele, Amy Beller, Candice D Fike, Judy L Aschner, Paul E Moore, Eric D Austin
OBJECTIVE: Extremely low gestational age neonates (ELGANs) are at risk for pulmonary hypertension (PH). We hypothesized that PH, defined by echocardiogram at 36 weeks gestational age (GA), would associate with respiratory morbidity, increased oxidant stress, and reduced nitric oxide production. STUDY DESIGN: ELGANs in the Vanderbilt fraction of the Prematurity and Respiratory Outcomes Program (PROP) who had echocardiograms at 36 ± 1 weeks GA were studied. Echocardiogram features of PH were compared with clinical characteristics as well as markers of oxidant stress and components of the nitric oxide pathway...
March 2018: Pediatric Pulmonology
https://www.readbyqxmd.com/read/29127889/nitric-oxide-and-arginase-levels-in-peri-implant-tissues-after-delayed-loading
#17
Ceren Gokmenoglu, Nurdan Ozmeric, Caglar Sungur, Raziye Sahin Bildik, Imge Erguder, Serenay Elgun
OBJECTIVE: Nitric oxide (NO) is synthesized from the conversion of L-arginine to L-citrulline by NO synthase (NOS). Arginase can compete with NOS for the common substrate L-arginine, and thus inhibit NO production. NO levels and arginase ezyme might affect the bone remodeling cycle around implants. The aim of this studywas to investigate NO and arginase levels in gingival crevicular fluid (GCF), peri-implant sulcular fluid (PISF), and saliva. MATERIALS AND METHODS: Twenty patients with one or more implants (Straumann® ; Institute Straumann AG, Basel, Switzerland) restored with fixed crown prostheses were included in the study...
January 2018: Archives of Oral Biology
https://www.readbyqxmd.com/read/29107336/citrulline-in-health-and-disease-review-on-human-studies
#18
REVIEW
Cinzia Papadia, Sylwia Osowska, Luc Cynober, Alastair Forbes
The amino acid L-citrulline (CIT) is safely used from the neonatal period onwards in those with urea cycle defects and carbamyl phosphate synthetase or ornithine transcarbamylase deficiencies, but several lines of enquiry indicate that it might have a much wider therapeutic role. When protein intake is low and there is a catabolic state, endogenous arginine (ARG) synthesis cannot fully be met and its supplementation can prove challenging, particularly in patients with critical and multisystem illness. Supplementary CIT could constitute a safer but still focused means of delivering ARG to endothelial and immune cells as CIT is efficiently recycled into these cells and as kidneys can convert CIT into ARG...
October 16, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29077741/rna-seq-transcriptional-profiling-of-leishmania-amazonensis-reveals-an-arginase-dependent-gene-expression-regulation
#19
Juliana Ide Aoki, Sandra Marcia Muxel, Ricardo Andrade Zampieri, Maria Fernanda Laranjeira-Silva, Karl Erik Müller, Audun Helge Nerland, Lucile Maria Floeter-Winter
BACKGROUND: Leishmania is a protozoan parasite that alternates its life cycle between the sand-fly vector and the mammalian host. This alternation involves environmental changes and leads the parasite to dynamic modifications in morphology, metabolism, cellular signaling and regulation of gene expression to allow for a rapid adaptation to new conditions. The L-arginine pathway in L. amazonensis is important during the parasite life cycle and interferes in the establishment and maintenance of the infection in mammalian macrophages...
October 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29070803/mir-193b-regulates-breast-cancer-cell-migration-and-vasculogenic-mimicry-by-targeting-dimethylarginine-dimethylaminohydrolase-1
#20
Julie-Ann Hulin, Sara Tommasi, David Elliot, Dong Gui Hu, Benjamin C Lewis, Arduino A Mangoni
Dimethylarginine dimethylaminohydrolase 1 (DDAH1) is responsible for metabolism of an endogenous inhibitor of nitric oxide synthase (NOS), asymmetric dimethylarginine (ADMA), which plays a key role in modulating angiogenesis. In addition to angiogenesis, tumours can establish a vascular network by forming vessel-like structures from tumour cells; a process termed vasculogenic mimicry (VM). Here, we identified over-expression of DDAH1 in aggressive MDA-MB-231, MDA-MB-453 and BT549 breast cancer cell lines when compared to normal mammary epithelial cells...
October 25, 2017: Scientific Reports
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