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l-arginine

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https://www.readbyqxmd.com/read/28528187/anticonvulsant-activity-of-pseudospondias-microcarpa-a-rich-engl-hydroethanolic-leaf-extract-in-mice-the-role-of-excitatory-inhibitory-neurotransmission-and-nitric-oxide-pathway
#1
Donatus W Adongo, Priscilla K Mante, Kennedy K E Kukuia, Robert P Biney, Eric Boakye-Gyasi, Charles K Benneh, Elvis O Ameyaw, Eric Woode
ETHNOPHARMACOLOGICAL RELEVANCE: Pseudospondias microcarpa (A. Rich) Engl. is a plant used for managing various diseases including central nervous system disorders. AIM OF THE STUDY: This study explored the anticonvulsant activity of P. microcarpa hydroethanolic leaf extract (PME) as well as possible mechanism(s) of action in animal models. METHODS: Effects of PME was assessed in electroconvulsive (the maximal electroshock and 6-Hz seizures) and chemoconvulsive (pentylenetetrazole-, picrotoxin-, isoniazid-, 4-aminopyridine-, and strychnine-induced seizures) models of epilepsy...
May 17, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28526785/effects-of-arginine-on-growth-virulence-gene-expression-and-stress-tolerance-by-streptococcus-mutans
#2
Brinta Chakraborty, Robert A Burne
Streptococcus mutans is a common constituent of oral biofilms and a primary etiologic agent of human dental caries. The bacteria associated with dental caries have a potent ability to produce organic acids from dietary carbohydrates and to grow and metabolize in acidic conditions. In contrast, many commensal bacteria produce ammonia through the arginine deiminase system (ADS), which moderates the pH of oral biofilms. Arginine metabolism by the ADS is a significant deterrent to the initiation and progression of dental caries...
May 19, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28526281/effects-of-maternal-immune-activation-on-brain-arginine-metabolism-of-postnatal-day-2-rat-offspring
#3
Jiaxian Zhang, Yu Jing, Hu Zhang, David K Bilkey, Ping Liu
l-Arginine is a versatile semi-essential amino acid with a number of bioactive metabolites, and altered arginine metabolism has been implicated in the pathogenesis of schizophrenia. Earlier research has demonstrated that maternal immune activation (MIA; a risk factor for schizophrenia) alters arginine metabolism in the prefrontal cortex and hippocampus of the adult offspring. The present study investigated how MIA affected the levels of l-arginine and its downstream metabolites in the whole forebrain, frontal cortex, hippocampus and cerebellum of male and female rat offspring at the age of postnatal day 2...
May 16, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28526264/celecoxib-aggravates-cardiac-apoptosis-in-l-name-induced-pressure-overload-model-in-rats-immunohistochemical-determination-of-cardiac-caspase-3-mcl-1-bax-and-bcl-2
#4
Sarah M Mosaad, Sawsan A Zaitone, Abdelazim Ibrahim, Amani A El-Baz, Dina M Abo-Elmatty, Yasser M Moustafa
The mechanism of celecoxib cardiovascular adverse events was earlier investigated; yet in-depth investigations are needed to assess the involvement of its pro-apoptotic effect throughout this process. An in-vivo chronic rat model of pressure overload employing Nʷ-nitro-l-arginine methyl ester (L-NAME) was tested at different time intervals to ensure the occurrence of persistent myocardial apoptosis along with pressure overload. Seven groups of male Wistar rats were assigned as (i) distilled water; (ii-iv) L-NAME (60 mg/kg) for 6, 12 or 16 weeks; (v-vii) L-NAME [16 weeks] + celecoxib (25, 50 or 100 mg/kg), from week 13 to week 16...
May 16, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28523848/dietary-supplementation-of-l-arginine-and-chromium-picolinate-in-sows-during-gestation-affects-the-muscle-fibre-characteristics-but-not-the-performance-of-their-progeny
#5
Zhan Shi, Wentao Song, Yuecheng Sun, Liansheng Wang, Baoming Shi, Anshan Shan, Zhongpeng Bi
BACKGROUND: The present study investigated the effects of dietary supplementation of L-arginine and chromium picolinate (CrP) in sows during gestation on the muscle fibre characteristics, performance and carcass characteristics of their progeny. Sixty healthy sows were randomly divided into four groups as 2 × 2 factorial experiment design: one group received the control diet, another received the control diet + 10 g kg(-1) L-arginine, the third group received the control diet + 400 ppb CrP and the fourth group received the control diet + 10 g kg(-1) L-arginine and 400 ppb CrP...
May 19, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28522425/development-and-characterization-of-fast-dissolving-tablets-of-oxaprozin-based-on-hybrid-systems-of-the-drug-with-cyclodextrins-and-nanoclays
#6
Francesca Maestrelli, Paola Mura, Marzia Cirri, Natascia Mennini, Carla Ghelardini, Lorenzo Di Cesare Mannelli
Previous studies highlighted an increase of the randomly-methylated-ß-cyclodextrin (RAMEB) solubilizing power towards oxaprozin when used in combination with L-arginine (ARG) or sepiolite nanoclay (SV). Therefore, the aim of this work was to investigate the possibility of maximising the RAMEB solubilizing efficacy by a joined approach based on the entrapment in SV of the drug-RAMEB-ARG complex. The quaternary nanocomposite was prepared by different techniques and characterized for solid state and dissolution properties, compared to ternary drug combinations with RAMEB-ARG, RAMEB-SV or ARG-SV...
May 15, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28518223/low-shear-stress-induces-endothelial-reactive-oxygen-species-via-the-at1r-enos-no-pathway
#7
Yuelin Chao, Peng Ye, Linlin Zhu, Xiangquan Kong, Xinliang Qu, Junxia Zhang, Jie Luo, Hongfeng Yang, Shaoliang Chen
Reactive oxygen species (ROS) contribute to many aspects of physiological and pathological cardiovascular processes. However, the underlying mechanism of ROS induction by low shear stress (LSS) remains unclear. Accumulating evidence has shown that the angiotensin II type 1 receptor (AT1R) is involved in inflammation, apoptosis, and ROS production. Our aim was to explore the role of AT1R in LSS-mediated ROS induction. We exposed human umbilical vein endothelial cells (HUVECs) to LSS (3 dyne/cm(2) ) for different periods of time...
May 18, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28518076/facile-preparation-of-ultrafine-aluminum-hydroxide-particles-with-or-without-mesoporous-mcm-41-in-ambient-environments
#8
Viktor Dubovoy, Ravi Subramanyam, Michael Stranick, Laurence Du-Thumm, Long Pan
An aqueous suspension of nanogibbsite was synthesized via the titration of aluminum aqua acid [Al(H2O)6](3+) with L-arginine to pH 4.6. Since the hydrolysis of aqueous aluminum salts is known to produce a wide array of products with a wide range of size distributions, a variety of state-of-the-art instruments (i.e., (27)Al/(1)H NMR, FTIR, ICP-OES, TEM-EDX, XPS, XRD, and BET) were used to characterize the synthesis products and identification of byproducts. The product, which was comprised of nanoparticles (10-30 nm), was isolated using gel permeation chromatography (GPC) column technique...
May 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28516373/class-side-effects-decreased-pressure-in-the-lower-oesophageal-and-the-pyloric-sphincters-after-the-administration-of-dopamine-antagonists-neuroleptics-anti-emetics-l-name-pentadecapeptide-bpc-157-and-l-arginine
#9
Zeljka Belosic Halle, Josipa Vlainic, Domagoj Drmic, Dean Strinic, Kresimir Luetic, Mario Sucic, Maria Medvidovic-Grubisic, Tatjana Pavelic Turudic, Igor Petrovic, Sven Seiwerth, Predrag Sikiric
The ulcerogenic potential of dopamine antagonists and L-NAME in rats provides unresolved issues of anti-emetic neuroleptic application in both patients and experimental studies. Therefore, in a 1-week study, we examined the pressures within the lower oesophageal and the pyloric sphincters in rats [assessed manometrically (cm H2O)] after dopamine neuroleptics/prokinetics, L-NAME, L-arginine and stable gastric pentadecapeptide BPC 157 were administered alone and/or in combination. Medication (/kg) was given once daily intraperitoneally throughout the 7 days, with the last dose at 24 h before pressure assessment...
May 17, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/28515682/nitric-oxide-synthase-inhibitor-attenuates-the-effects-of-repeated-restraint-stress-on-synaptic-transmission-in-the-paraventricular-nucleus-of-the-rat-hypothalamus
#10
Magdalena Kusek, Anna Tokarska, Marcin Siwiec, Anna Gadek-Michalska, Bernadeta Szewczyk, Grzegorz Hess, Krzysztof Tokarski
Corticotropin-releasing hormone (CRH)-synthesizing parvocellular neuroendocrine cells (PNCs) of the hypothalamic paraventricular nucleus (PVN) play a key role in the activation of the hypothalamic-pituitary-adrenocortical (HPA) axis. Several studies have demonstrated that synaptic inputs to these cells may undergo stress-related enhancement but, on the other hand, it has been reported that exposition to the same stressor for prolonged time periods may induce a progressive reduction in the response of the HPA axis to homotypic stressors...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28515388/nitric-oxide-is-critical-for-avoiding-hepatic-lipid-overloading-via-il6-induction-during-liver-regeneration-after-partial-hepatectomy-in-mice
#11
Yue Yu, Miho Tamai, Yoh-Ichi Tagawa
Nitric oxide (NO), generated from L-arginine by three different isoforms of nitric oxide synthase (NOS), is a pleiotropic factor to regulate physiological functions in almost every organ and tissue. Each knockout mouse of iNOS or eNOS has been used to suggest that NO has a crucial role in liver regeneration after partial hepatectomy (PH), for NO may inhibit caspase 3 activity and is required for EGFR signaling. In previous reports, defective mitochondrial β-oxidation was observed in eNOS KO mice, and hepatic steatosis was often correlated to deficient liver regeneration, so we focused on metabolic perspective and hypothesized that NO depletion in PH mice would affect hepatocytic lipolysis and impair hepatocytes proliferation...
May 18, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28506802/stealth-magnetic-nanocarriers-of-sirna-as-platform-for-breast-cancer-theranostics
#12
J Bruniaux, S Ben Djemaa, K Hervé-Aubert, H Marchais, I Chourpa, S David
The endogenous mechanism of RNA interference is more and more used in research to obtain specific down-regulation of gene expression in diseases such as breast cancer. Currently, despite the new fields of study open up by RNA interference, the rapid degradation of siRNA by nucleases and their negative charges prevent them from crossing cell membranes. To overcome these limitations, superparamagnetic iron oxide nanoparticles (SPIONs) represent a promising alternative for nucleic acid delivery. Previously, we reported the magnetic siRNA nanovectors (MSN) formulation using electrostatic assembly of (1) SPIONs, also able to act as contrast agents for magnetic resonance imaging (MRI), (2) siRNA and (3) chitosan aiming at their protection and enhancing their transfection efficacy...
May 12, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28506644/affinity-purification-of-car9-tagged-proteins-on-silica-matrices-optimization-of-a-rapid-and-inexpensive-protein-purification-technology
#13
Jessica Soto-Rodríguez, Brandon L Coyle, Ariana Samuelson, Kannan Aravagiri, François Baneyx
Car9, a dodecapeptide identified by cell surface display for its ability to bind to the edge of carbonaceous materials, also binds to silica with high affinity. The interaction can be disrupted with l-lysine or l-arginine, enabling a broad range of technological applications. Previously, we reported that C-terminal Car9 extensions support efficient protein purification on underivatized silica. Here, we show that the Car9 tag is functional and TEV protease-excisable when fused to the N-termini of target proteins, and that it supports affinity purification under denaturing conditions, albeit with reduced yields...
May 12, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28503900/effects-of-in-ovo-feeding-of-l-arginine-on-the-development-of-digestive-organs-intestinal-function-and-post-hatch-performance-of-broiler-embryos-and-hatchlings
#14
T Gao, M M Zhao, Y J Li, L Zhang, J L Li, L L Yu, F Gao, G H Zhou
This study was to investigate the effects of in ovo feeding (IOF) L-arginine (Arg) solution on the development of digestive organs, the duodenal mucosa of broiler embryos and hatchlings, and the growth performance of chicks during the first week post-hatch. A total of 720 fertilized eggs with similar weight were randomly allocated to three groups, consisting of eight replicates of 30 eggs each. Three treatments were arranged as non-injected control, diluent-injected (0.75% NaCl solution) group and Arg solution-injected group containing 1% Arg, dissolved in diluent...
May 15, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/28502835/the-adma-ddah-no-pathway-in-human-vein-endothelial-cells-exposed-to-arsenite
#15
Citlalli Osorio-Yáñez, Miguel Chin-Chan, Luz C Sánchez-Peña, Octavio G Atzatzi-Aguilar, Jesus A Olivares-Reyes, José Segovia, Luz M Del Razo
Inorganic arsenic (iAs) exposure is related to cardiovascular disease, which is characterized by endothelial dysfunction and nitric oxide (NO) depletion. The mechanisms underlying NO depletion as related to iAs exposure are not fully understood. The endogenous inhibitor of nitric oxide synthase, asymmetric dimethylarginine (ADMA), might be a molecular target of iAs. ADMA concentrations are regulated by proteins involved in its synthesis (arginine methyl transferase 1 [PRMT-1]) and degradation (dimethylarginine dimethylaminohydrolase [DDAH])...
May 11, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28501796/nitric-oxide-synthase-inhibition-restores-orthostatic-tolerance-in-young-vasovagal-syncope-patients
#16
Julian M Stewart, Richard Sutton, Mira L Kothari, Amanda M Goetz, Paul Visintainer, Marvin Scott Medow
OBJECTIVE: Syncope is sudden transient loss of consciousness and postural tone with spontaneous recovery; the most common form is vasovagal syncope(VVS). We previously demonstrated impaired post-synaptic adrenergic responsiveness in young VVS patientswas reversed by blocking nitric oxide synthase(NOS). We hypothesised that nitric oxide may account for reduced orthostatic tolerance in young recurrent VVS patients. METHODS: We recorded haemodynamics in supine VVS and healthy volunteers (aged 15-27 years), challenged with graded lower body negative pressure (LBNP) (-15, -30, -45 mm Hg each for 5 min, then -60 mm Hg for a maximum of 50 min) with and without NOS inhibitor N(G)-monomethyl-L-arginine acetate(L-NMMA)...
May 13, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28501704/genetic-variation-in-slc7a2-interacts-with-calcium-and-magnesium-intakes-in-modulating-the-risk-of-colorectal-polyps
#17
Pin Sun, Xiangzhu Zhu, Martha J Shrubsole, Reid M Ness, Elizabeth A Hibler, Qiuyin Cai, Jirong Long, Zhi Chen, Guoliang Li, Lifang Hou, Walter E Smalley, Todd L Edwards, Edward Giovannucci, Wei Zheng, Qi Dai
Solute carrier family 7, member 2 (SLC7A2) gene encodes a protein called cationic amino acid transporter 2, which mediates the transport of arginine, lysine and ornithine. l-Arginine is necessary for cancer development and progression, including an important role in colorectal cancer pathogenesis. Furthermore, previous studies found that both calcium and magnesium inhibit the transport of arginine. Thus, calcium, magnesium or calcium:magnesium intake ratio may interact with polymorphisms in the SLC7A2 gene in association with colorectal cancer...
May 5, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28501696/the-role-of-nitric-oxide-in-anticonvulsant-effect-of-nanocurcumine-on-pentylenetetrazole-induced-seizure-in-mice
#18
Alireza Aminirad, Seyyedeh Elaheh Mousavi, Nahid Fakhraei, Seyyedeh Mahbubeh Mousavi, Seyed Mahdi Rezayat
A plant alkaloid obtained from Curcuma longa, curcumin possesses anti-oxidant and anti-inflammatory effects. Nanoformulations have been developed for preclinical studies which demonstrate enhanced therapeutic efficacy. Effect of acute intraperitoneal (i.p.) administration of curcumin C3 complex nanoparticles [1,5, 10, 20, 40, 80mg/kg, (i.p.)] 75min prior to PTZ, on clonic seizure thresholds induced by intravenous infusion of pentylenetetrazole (PTZ) 0.5% was investigated in comparison with curcumin (40 and 80mg/kg, i...
May 10, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28501300/a-metabolite-gwas-mgwas-approach-to-unveil-chronic-kidney-disease-progression
#19
Guanshi Zhang, Rintaro Saito, Kumar Sharma
In this issue, McMahon et al. report that, by combining phenotypic, metabolomic, and genetic data, they could better detect chronic kidney disease at the early stages and provide insight into its pathobiology. The most significant findings of the study are that several urinary metabolites (e.g., glycine and histidine) were identified as early risk factors for chronic kidney disease, and metabolites with genomewide association study analysis identified associations of urinary metabolites (i.e., lysine and N(G)-monomethyl-l-arginine) with single-nucleotide polymorphisms of SLC7A9...
June 2017: Kidney International
https://www.readbyqxmd.com/read/28500346/structural-studies-of-the-periplasmic-portion-of-the-diguanylate-cyclase-cdgh-from-vibrio-cholerae
#20
Min Xu, Yi-Zhi Wang, Xiu-An Yang, Tao Jiang, Wei Xie
Cyclic diguanylate monophosphate (c-di-GMP) is a second messenger involved in bacterial signal transduction and produced by diguanylate cyclases (DGCs) generally containing highly variable periplasmic signal-recognition domains. CdgH is a DGC enzyme that regulates rugosity associated phenotypes in Vibrio cholerae. CdgH has two N-terminal tandem periplasmic substrate-binding (PBPb) domains for its signal recognition; however, the role of the tandem PBPb domains remains unclear. Here, we reported the crystal structure of the periplasmic portion of CdgH, which indicated that both tandem PBPb domains consist of typical interlobe ligand-binding architecture...
May 12, 2017: Scientific Reports
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