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Renal physiology

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https://www.readbyqxmd.com/read/28717107/human-plasma-and-urinary-metabolic-profiles-of-trimethylamine-and-trimethylamine-n-oxide-extrapolated-using-a-simple-physiologically-based-pharmacokinetic-model
#1
Makiko Shimizu, Hiroshi Yamazaki
Trimethylamine, a dietary- and medicinal carnitine-derived amine, is extensively metabolized by liver to non-malodorous trimethylamine N-oxide. Although trimethylamine and trimethylamine N-oxide under daily dietary consumption or carnitine treatment are generally regarded as nontoxic, they have been, and remain, of toxicological and clinical interest because of their potential association with atherosclerosis. The aim of the current study was to model the pharmacokinetics of trimethylamine after oral administration of trimethylamine in humans and compare the results with reported measured values...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28715484/multiple-renal-cancer-susceptibility-polymorphisms-modulate-the-hif-pathway
#2
Steffen Grampp, Virginia Schmid, Rafik Salama, Victoria Lauer, Franziska Kranz, James L Platt, James Smythies, Hani Choudhry, Margarete Goppelt-Struebe, Peter J Ratcliffe, David R Mole, Johannes Schödel
Un-physiological activation of hypoxia inducible factor (HIF) is an early event in most renal cell cancers (RCC) following inactivation of the von Hippel-Lindau tumor suppressor. Despite intense study, how this impinges on cancer development is incompletely understood. To test for the impact of genetic signals on this pathway, we aligned human RCC-susceptibility polymorphisms with genome-wide assays of HIF-binding and observed highly significant overlap. Allele-specific assays of HIF binding, chromatin conformation and gene expression together with eQTL analyses in human tumors were applied to mechanistic analysis of one such overlapping site at chromosome 12p12...
July 17, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28714397/prognostic-value-of-copeptin-in-chronic-kidney-disease-from-general-population-to-end-stage-renal-disease
#3
Edyta Golembiewska, Anna Machowska, Peter Stenvinkel, Bengt Lindholm
Arginine vasopressin (AVP), also known as antidiuretic hormone (ADH), is released in response to osmotic and non-osmotic stimuli and plays a key role in many physiologic and pathologic processes. The main function of AVP is the control of fluid homeostasis by inducing water conservation by the kidney, but it also stimulates arteriolar vasoconstriction and the release of adrenocorticotropic hormone (ACTH). These actions are mediated by different AVP receptors located on various target cells. Produced in hypothalamus from a larger precursor, pre-proAVP, AVP is produced in equimolar amounts to copeptin, a glycopeptide with yet unknown biologic function...
July 14, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28714258/renal-neuroendocrine-control-of-desiccation-and-cold-tolerance-by-drosophila-suzukii
#4
Selim Terhzaz, Lucy Alford, Joseph G C Yeoh, Richard Marley, Anthony J Dornan, Julian A T Dow, Shireen A Davies
BACKGROUND: Neuropeptides are central to the regulation of physiological, and behavioural processes in insects, directly impacting cold and desiccation survival. However, little is known about the control mechanisms governing these responses in D. suzukii. The close phylogenetic relationship of D. suzukii with D. melanogaster allows, through genomic and functional studies, an insight into the mechanisms directing stress tolerance in D. suzukii. RESULTS: Capa, Leucokinin, DH44 and DH31 neuropeptides demonstrate a high level of conservation between D...
July 17, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28712733/long-term-outcomes-after-autogenous-versus-synthetic-lower-extremity-bypass-in-patients-on-hemodialysis
#5
Isibor Arhuidese, Caitlin W Hicks, Satinderjit Locham, Tammam Obeid, Besma Nejim, Mahmoud B Malas
BACKGROUND: Hemodialysis dependence confers unique physiologic conditions. Prior reports of outcomes after infrainguinal open bypass operations in patients on hemodialysis have been based on relatively small sample institutional series. In this study, we evaluate long-term outcomes after open bypass operations in a large contemporary population-based cohort of hemodialysis patients. We studied all hemodialysis patients who underwent infrainguinal open operation using autogenous versus prosthetic conduits in the United States Renal Data System between January 2007 and December 2011...
July 13, 2017: Surgery
https://www.readbyqxmd.com/read/28711072/chronic-kidney-disease-and-pregnancy
#6
Michelle A Hladunewich
Women with chronic kidney disease (CKD) are at risk for adverse pregnancy-associated outcomes, including progression of their underlying renal dysfunction, a flare of their kidney disease, and adverse pregnancy complications such as preeclampsia and preterm delivery. Earlier-stage CKD, as a rule, is a safer time to have a pregnancy, but even women with end-stage kidney disease have attempted pregnancy in recent years. As such, nephrologists need to be comfortable with pregnancy preparation and management at all stages of CKD...
July 2017: Seminars in Nephrology
https://www.readbyqxmd.com/read/28710553/metabolism-and-distribution-of-pharmacological-homoarginine-in-plasma-and-main-organs-of-the-anesthetized-rat
#7
Duygu Naile Günes, Arslan Arinc Kayacelebi, Erik Hanff, Joel Lundgren, Björn Redfors, Dimitrios Tsikas
L-Homoarginine (hArg) and guanidinoacetate (GAA) are produced from L-arginine (Arg) by the catalytic action of arginine:glycine amidinotransferase. Guanidinoacetate methyltransferase methylates GAA on its non-guanidine N atom to produce creatine. Arg and hArg are converted by nitric oxide synthase (NOS) to nitric oxide (NO). NO is oxidized to nitrite and nitrate which circulate in the blood and are excreted in the urine. Asymmetric dimethylarginine (ADMA), an NOS inhibitor, is widely accepted to be exclusively produced after asymmetric N (G)-methylation of Arg residues in proteins and their regular proteolysis...
July 14, 2017: Amino Acids
https://www.readbyqxmd.com/read/28707190/novel-porcine-model-for-calcium-oxalate-stone-formation
#8
Brandon P Trojan, Sara J Trojan, Andrew Navetta, Bryce Staches, Bryan Sutton, Stephanie Filleur, Thomas Nelius
BACKGROUND: Mechanisms for calcium-based stone formation are not clearly delineated. Porcine are the most anatomically and physiologically congruent mammal to humans. Our objectives were to develop a cost-effective and easily reproducible porcine model for the study of calcium-based nephrolithiasis. METHODS: Crossbred male pigs (n = 16) were assigned randomly to one of the following treatments: (1) control; (2) ethylene glycol (EG) + vitamin D (VD); (3) EG + ammonium chloride (AC); (4) EG + gentamicin (G); (5) EG + Lasix; (6) EG + VD + AC; (7) EG + VD + G...
July 13, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/28706270/comprehensive-multi-dimensional-mri-for-the-simultaneous-assessment-of-cardiopulmonary-anatomy-and-physiology
#9
Joseph Y Cheng, Tao Zhang, Marcus T Alley, Martin Uecker, Michael Lustig, John M Pauly, Shreyas S Vasanawala
Diagnostic testing often assesses the cardiovascular or respiratory systems in isolation, ignoring the major pathophysiologic interactions between the systems in many diseases. When both systems are assessed currently, multiple modalities are utilized in costly fashion with burdensome logistics and decreased accessibility. Thus, we have developed a new acquisition and reconstruction paradigm using the flexibility of MRI to enable a comprehensive exam from a single 5-15 min scan. We constructed a compressive-sensing approach to pseudo-randomly acquire highly subsampled, multi-dimensionally-encoded and time-stamped data from which we reconstruct volumetric cardiac and respiratory motion phases, contrast-agent dynamics, and blood flow velocity fields...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28701840/colistin-nephrotoxicity-in-adults-single-centre-large-series-from-india
#10
Abdul Ghafur, Swati Gohel, Vidyalakshmi Devarajan, T Raja, Jose Easow, M A Raja, Sankar Sreenivas, Balasubramaniam Ramakrishnan, T Ramakrishnan, S G Raman, Dedeepiya Devaprasad, Balaji Venkatachalam, Ramesh Nimmagadda
CONTEXT: Limited Indian data are available on the rate of colistin nephrotoxicity and other risk factors contributing to the development of this important side effect. AIM: This study aims to generate data on colistin nephrotoxicity from a large cohort of Indian patients. DESIGN: Retrospective cohort study. MATERIALS AND METHODS: Case record analysis of patients who received colistin, in an oncology center in India, between January 2011 and December 2015...
June 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28701313/dynamic-regulation-of-lysine-acetylation-the-balance-between-acetyltransferase-and-deacetylase-activities
#11
Kelly A Hyndman, Mark A Knepper
Reversible posttranslational modification (PTM) of proteins is a critically important process in physiological regulation in all tissues including the kidney. Lysine acetylation occurs in all organisms including prokaryotes, and is regulated by a balance between the lysine acetyltransferases (adding an acetyl group to the ε-amino group of a lysine) and deacetylases (removing it). The kidney is an organ rich with acetylated lysines which map to >2000 unique histone and non-histone proteins. However, the functional significance of these modifications remains to be discovered...
July 12, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28699016/position-related-renal-perfusion-disturbances-as-a-possible-underestimated-mechanism-in-patients-with-resistant-hypertension-a-case-vignette
#12
Jan Schiefer, Holger Amthauer, Philipp Genseke, Peter R Mertens, Christos Chatzikyrkou
PURPOSE: In patients with resistant hypertension and large blood pressure fluctuations, the role of orthostatic hypertension, associated with position-dependent renal perfusion disturbances, has not been investigated in detail yet. METHODS: In this regard, four patients from our outpatient clinic were investigated by the use of 24-h ambulatory blood pressure monitoring (ABPM), active standing test, renal duplex sonography and Tc99m-mercaptoacetyltriglycine [MAG3] renal scintigraphy in supine and upright position...
July 11, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/28698546/obesity-induces-organ-and-tissue-specific-tight-junction-restructuring-and-barrier-deregulation-by-claudin-switching
#13
Rizwan Ahmad, Bilal Rah, Dhundy Bastola, Punita Dhawan, Amar B Singh
Obesity increases susceptibility to multiple organ disorders, however, underlying mechanisms remain unclear. The subclinical inflammation assisted by obesity-induced gut permeability may underlie obesity-associated co-morbidities. Despite eminent clinical significance of the obesity led gut barrier abnormalities, its precise molecular regulation remains unclear. It is also unknown whether barrier deregulations, similar to the gut, characterize other vital organs in obese individuals. The claudin family of proteins is integral to the tight junction (TJ), the apical cell-cell adhesion and a key regulator of the epithelial barrier...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28698529/naturally-occurring-compounds-new-potential-weapons-against-oxidative-stress-in-chronic-kidney-disease
#14
REVIEW
Lorenzo Signorini, Simona Granata, Antonio Lupo, Gianluigi Zaza
Oxidative stress is a well-described imbalance between the production of reactive oxygen species (ROS) and the antioxidant defense system of cells and tissues. The overproduction of free radicals damages all components of the cell (proteins, lipids, nucleic acids) and modifies their physiological functions. As widely described, this condition is a biochemical hallmark of chronic kidney disease (CKD) and may dramatically influence the progression of renal impairment and the onset/development of major systemic comorbidities including cardiovascular diseases...
July 10, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28698270/association-between-endothelin-1-levels-and-kidney-disease-among-blacks
#15
Casey M Rebholz, Jane L Harman, Morgan E Grams, Adolfo Correa, Daichi Shimbo, Josef Coresh, Bessie A Young
Endothelin-1, a marker of endothelial dysfunction, is a potent vasoconstrictor released by endothelial cells and an important regulator of renal physiology. It is not known whether elevated serum levels of endothelin-1 indicate future risk of kidney disease in the general population. In participants in the Jackson Heart Study, a community-based observational study of cardiovascular risk in black adults, we measured serum endothelin-1 level at baseline (2000-2004; n=3538). We defined incident CKD as eGFR<60 ml/min per 1...
July 11, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28694171/repeated-dose-28-day-oral-toxicity-study-of-deae-dextran-in-mice-an-advancement-in-safety-chemotherapeutics
#16
Anita K Bakrania, Bhavesh C Variya, Prem Madan, Snehal S Patel
Cancer has emerged as a global threat with challenges for safe chemotherapeutics. Most of the currently available anti-cancer drugs exhibit significant toxicity. Amongst novel agents, interferons have exhibited anti-proliferative and cytoprotective roles. However, due to stability drawbacks of interferons, we have identified an interferon inducer DEAE-Dextran, which resolves the stability issues. Based on the previous history of toxicity pertaining to the current chemotherapeutic agents, it is equally essential to determine the safety of DEAE-Dextran...
July 8, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28692474/molecular-adsorbent-recirculating-system-effectively-replaces-hepatic-function-in-severe-acute-liver-failure
#17
Steven I Hanish, Deborah M Stein, Joseph R Scalea, Eno-Obong Essien, Paul Thurman, William R Hutson, Stephen T Bartlett, Rolf N Barth, Thomas M Scalea
BACKGROUND DATA: Patients with severe acute liver failure (ALF) have extreme physiologic dysfunction and often die if transplantation is not immediately available. Patients may be supported with MARS (Baxter International Inc., Deerfield, IL) until transplantation or spontaneous recovery occurs. We present the largest series in the United States of MARS therapy as temporary hepatic replacement for ALF. METHODS: MARS was used to support patients with severe liver trauma (SLT), in ALF patients as a bridge to transplantation (BTT), and as definitive therapy for toxic ingestion or idiopathic liver failure (DT) in a level 1 trauma center and large transplant center...
July 7, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28691599/sheep-model-of-haemodialysis-treatment
#18
Jolanta Bujok, Tomasz Walski, Albert Czerski, Katarzyna Gałecka, Karolina Grzeszczuk-Kuć, Wojciech Zawadzki, Wojciech Witkiewicz, Małgorzata Komorowska
More than two million patients received haemodialysis (HD) in 2013. Many methods for improving dialysis therapy outcomes have been tested. Nevertheless, patients continue to experience high morbidity and mortality rates. We aimed to develop an animal model of HD treatment to study methods that would prevent the adverse effects of renal replacement therapy. The study was conducted using six male Merino sheep. The animals underwent a two-step bilateral nephrectomy, and a permanent dual-lumen catheter was inserted into the jugular vein...
January 1, 2017: Laboratory Animals
https://www.readbyqxmd.com/read/28686716/gsr-is-not-essential-for-the-maintenance-of-antioxidant-defenses-in-mouse-cochlea-possible-role-of-the-thioredoxin-system-as-a-functional-backup-for-gsr
#19
Chul Han, Mi-Jung Kim, Dalian Ding, Hyo-Jin Park, Karessa White, Logan Walker, Tongjun Gu, Masaru Tanokura, Tatsuya Yamasoba, Paul Linser, Richard Salvi, Shinichi Someya
Glutathione reductase (GSR), a key member of the glutathione antioxidant defense system, converts oxidized glutathione (GSSG) to reduced glutathione (GSH) and maintains the intracellular glutathione redox state to protect the cells from oxidative damage. Previous reports have shown that Gsr deficiency results in defects in host defense against bacterial infection, while diquat induces renal injury in Gsr hypomorphic mice. In flies, overexpression of GSR extended lifespan under hyperoxia. In the current study, we investigated the roles of GSR in cochlear antioxidant defense using Gsr homozygous knockout mice that were backcrossed onto the CBA/CaJ mouse strain, a normal-hearing strain that does not carry a specific Cdh23 mutation that causes progressive hair cell degeneration and early onset of hearing loss...
2017: PloS One
https://www.readbyqxmd.com/read/28682990/elevated-serum-triglycerides-in-the-prognostic-assessment-of-acute-pancreatitis-a-systematic-review-and-meta-analysis-of-observational-studies
#20
Qian Wang, Gang Wang, Zhaoyan Qiu, Xianli He, Chaoxu Liu
BACKGROUND: Hypertriglyceridemia has been positively associated with the risk of acute pancreatitis (AP), but whether increased triglyceride (TG) levels are associated with the severity of AP remains unknown. To this, a meta-analysis was conducted to assess the effect of elevated serum TG on the prognosis of AP. METHODS: We searched PubMed, EMBASE, and the Cochrane library to identify all eligible studies (up to September 2016). We pooled the odds ratios (ORs) or standardized mean difference from individual studies using a random-effects model to investigate associations between levels of TG and the prognosis of AP...
August 2017: Journal of Clinical Gastroenterology
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