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https://www.readbyqxmd.com/read/28507167/early-activation-of-deleterious-molecular-pathways-in-the-kidney-in-experimental-heart-failure-with-atrial-remodeling
#1
Tomoko Ichiki, Brenda K Huntley, Gail J Harty, S Jeson Sangaralingham, John C Burnett
Heart failure (HF) is a major health problem with worsening outcomes when renal impairment is present. Therapeutics for early phase HF may be effective for cardiorenal protection, however the detailed characteristics of the kidney in early-stage HF (ES-HF), and therefore treatment for potential renal protection, are poorly defined. We sought to determine the gene and protein expression profiles of specific maladaptive pathways of ES-HF in the kidney and heart. Experimental canine ES-HF, characterized by de-novo HF with atrial remodeling but not ventricular fibrosis, was induced by right ventricular pacing for 10 days...
May 2017: Physiological Reports
https://www.readbyqxmd.com/read/28496138/severe-bilateral-ischemic-reperfusion-renal-injury-hyperacute-and-acute-changes-in-apparent-diffusion-coefficient-t1-and-t2-mapping-with-immunohistochemical-correlations
#2
Sheung-Fat Ko, Hon-Kan Yip, Yen-Yi Zhen, Chia-Chang Lee, Chen-Chang Lee, Shyh-Jer Huang, Chung-Cheng Huang, Shu-Hang Ng, Jui-Wei Lin
The aim of this study was to investigate the hyperacute and acute changes in apparent diffusion coefficient (ADC), T1, and T2 mapping in rat kidneys after severe bilateral renal ischemic-reperfusion injury (IRI). After baseline MRI, 24 Spraque-Dawley rats with renal IRI were divided equally as group 1 (post-IRI MRI at 6 hours, days 1, 3, and 7) and groups 2, 3, and 4 (post-IRI MRI at 6 hours; 6 hours and day 1; 6 hours, days 1 and 3, respectively), while six other rats without IRI (group 5) were used as sham control...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28495544/modeling-glucose-metabolism-and-lactate-production-in-the-kidney
#3
Ying Chen, Brendan C Fry, Anita T Layton
The metabolism of glucose provides most of the ATP required for energy-dependent transport processes. In the inner medulla of the mammalian kidney, limited blood flow and O2 supply yield low oxygen tension; therefore, a substantial fraction of the glucose metabolism in that region is anaerobic. Lactate is considered to be a waste product of anaerobic glycolysis, which yields two lactate molecules for each glucose molecule consumed, thereby likely leading to the production and accumulation of a significant amount of lactate in the inner medulla...
May 8, 2017: Mathematical Biosciences
https://www.readbyqxmd.com/read/28488274/quantitative-single-breath-hold-renal-arterial-spin-labeling-imaging-at-7t
#4
Xiufeng Li, Edward J Auerbach, Pierre-Francois Van de Moortele, Kamil Ugurbil, Gregory J Metzger
PURPOSE: To evaluate the feasibility of quantitative single breath-hold renal arterial spin labeling (ASL) imaging at 7T. METHODS: A single-shot fast spin echo FAIR (flow-sensitive alternating inversion recovery) method was used to perform two studies. First, a multi-delay perfusion study was performed to estimate the spin labeling temporal bolus width achievable with a local transceiver array coil at 7T. Second, with a conservatively defined bolus width, a quantitative perfusion study was performed using the single subtraction approach...
May 9, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28470945/mri-evaluation-of-renal-ischemia-reperfusion-injury-in-rabbit-model
#5
Liang Pan, Jie Chen, Wei Xing, Zhaoyu Xing, Jinggang Zhang, Yan Peng, Zhuoli Zhang
To evaluate the feasibility of susceptibility weighted imaging (SWI) as a tool to identify the changes in the renal outer medulla (OM) in a rabbit model of renal ischemia reperfusion injury (IRI). New Zealand rabbits were used in this study (control = 10 and IRI groups = 40). The rabbits in the IRI group were subjected to left renal artery clamping for 60 minutes. T2-weighted (T2WI) and SWI examinations were performed at 1 h, 12 h, 24 h and 48 h after reperfusion (each n = 10). After the examinations, nephrectomy was performed for histologic evaluation...
May 4, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28467098/imaging-features-of-primary-renal-lymphoma
#6
Qingqiang Zhu, Wenrong Zhu, Jingtao Wu, Wenxin Chen
Background Cases of primary renal lymphoma (PRL) are quite rare and are often mistaken for renal cell carcinoma. Purpose To determine the multislice computed tomography (MSCT) and magnetic resonance imaging (MRI) characteristics of PRL. Materials and Methods Twenty-three patients with PRL were identified by CT and MRI, and their tumor characteristics were assessed. Results Tumors exhibited single or multifocal nodules (n = 19) and diffuse renal enlargement (n = 4). Twenty-two tumors exhibited an infiltrative appearance...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28463522/optimization-of-split-bolus-ct-urography-effect-of-differences-in-allocation-of-contrast-medium-and-prolongation-of-imaging-delay
#7
Dahye Lee, Eun-Suk Cho, Joo Hee Kim, Yong Pyo Kim, Hyeon-Kyeong Lee, Jeong-Sik Yu, Jae-Joon Chung
OBJECTIVE: The purpose of this study was to find the optimal allocation ratio of contrast medium (CM) in split-bolus CT urography (CTU) and to investigate the effect of increased imaging delays for synchronous nephrographic-excretory phase imaging. SUBJECTS AND METHODS: One hundred ninety-two patients were randomly assigned to one of three protocols with different allocation ratios of CM: group A, 30% of CM at first bolus and 70% of CM at second bolus; group B, 70% and 30%; or group C, 50% and 50%...
May 2, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28461605/selective-nrf2-gene-deletion-in-the-rostral-ventrolateral-medulla-evokes-hypertension-and-sympathoexcitation-in-mice
#8
Lie Gao, Matthew C Zimmerman, Shyam Biswal, Irving H Zucker
Nuclear factor erythroid 2-related factor 2 (Nrf2) is a master transcriptional regulator of redox homeostasis that impacts antioxidant gene expression. Central oxidative stress and reduced antioxidant enzyme expression in the rostral ventrolateral medulla (RVLM) contributed to sympathoexcitation in chronic heart failure. In the current study, we hypothesized that deletion of Nrf2 in the RVLM would increase sympathetic drive and blood pressure. Experiments were performed in Nrf2-floxed mice treated with microinjection of lentiviral-Cre-GFP or lentiviral-GFP into the RVLM...
June 2017: Hypertension
https://www.readbyqxmd.com/read/28455887/human-adipose-stromal-cell-therapy-improves-survival-and-reduces-renal-inflammation-and-capillary-rarefaction-in-acute-kidney-injury
#9
Jason A Collett, Dmitry O Traktuev, Purvi Mehrotra, Allison Crone, Stephanie Merfeld-Clauss, Keith L March, David P Basile
Damage to endothelial cells contributes to acute kidney injury (AKI) by causing impaired perfusion, while the permanent loss of the capillary network following AKI has been suggested to promote chronic kidney disease. Therefore, strategies to protect renal vasculature may impact both short-term recovery and long-term functional preservation post-AKI. Human adipose stromal cells (hASCs) possess pro-angiogenic and anti-inflammatory properties and therefore have been tested as a therapeutic agent to treat ischaemic conditions...
April 28, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28445205/inhibition-of-microrna-429-in-the-renal-medulla-increased-salt-sensitivity-of-blood-pressure-in-sprague-dawley-rats
#10
Qing Zhu, Junping Hu, Lei Wang, Weili Wang, Zhengchao Wang, Pin-Lan Li, Krishna M Boini, Ningjun Li
BACKGROUND: We have previously shown that high salt intake suppresses the expression of prolyl hydroxylase domain-containing protein 2 (PHD2), an enzyme promoting the degradation of hypoxia-inducible factor (HIF)-1α, and increases HIF-1α along with its target genes in the renal medulla, which promotes sodium excretion and regulate salt sensitivity of blood pressure. However, it remains unknown how high salt inhibits the expression of PHD2. METHOD AND RESULTS: The current study first revealed that high-salt-induced PHD2 inhibition was due to the enhanced decay of mRNA...
April 25, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28444761/photon-counting-ct-for-simultaneous-imaging-of-multiple-contrast-agents-in-the-abdomen-an-in-vivo-study
#11
Rolf Symons, Bernhard Krauss, Pooyan Sahbaee, Tyler E Cork, Manu N Lakshmanan, David A Bluemke, Amir Pourmorteza
PURPOSE: To demonstrate the feasibility of spectral imaging using photon-counting detector (PCD) x-ray computed tomography (CT) for simultaneous material decomposition of 3 contrast agents in vivo in a large animal model. METHODS: This Institutional Animal Care and Use Committee-approved study used a canine model. Bismuth subsalicylate was administered orally 24-72 hours before imaging. PCD CT was performed during intravenous administration of 40-60 ml gadoterate meglumine; 3...
April 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28434125/kidney-morphological-parameters-measured-using-noncontrast-enhanced-steady-state-free-precession-mri-with-spatially-selective-inversion-recovery-pulse-correlate-with-egfr-in-patients-with-advanced-ckd
#12
Tadashi Otsuka, Yoshikatsu Kaneko, Yuya Sato, Ryohei Kaseda, Ryuji Aoyagi, Suguru Yamamoto, Shin Goto, Ichiei Narita
BACKGROUND: It is well known that atrophic renal changes are associated with chronic kidney disease (CKD) progression, but conventional diagnostic imaging methods such as noncontrast-enhanced computed tomography and magnetic resonance imaging (MRI) have been insufficient for precisely assessing kidney function because they cannot clearly distinguish between the medulla and cortex. Hence, here we used noncontrast-enhanced steady-state free precession (SSFP) MRI with a spatially selective inversion recovery (IR) pulse to improve visibility for renal corticomedullary differentiation and evaluated the association between morphological parameters and kidney function in patients with CKD...
April 22, 2017: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/28428757/circadian-rhythm-in-kidney-tissue-oxygenation-in-the-rat
#13
Tonja W Emans, Ben J Janssen, Jaap A Joles, C T Paul Krediet
Blood pressure, renal hemodynamics, electrolyte, and water excretion all display diurnal oscillation. Disturbance of these patterns is associated with hypertension and chronic kidney disease. Kidney oxygenation is dependent on oxygen delivery and consumption that in turn are determined by renal hemodynamics and metabolism. We hypothesized that kidney oxygenation also demonstrates 24-h periodicity. Telemetric oxygen-sensitive carbon paste electrodes were implanted in Sprague-Dawley rats (250-300 g), either in renal medulla (n = 9) or cortex (n = 7)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28414294/salt-and-water-not-so-simple
#14
Mark L Zeidel
It has long been viewed that the maintenance of osmotic balance in response to high salt intake is a passive process that is mediated largely by increased water consumption to balance the salt load. Two studies in this issue of the JCI challenge this notion and demonstrate that osmotic balance in response to high salt intake involves a complex regulatory process that is influenced by hormone fluctuation, metabolism, food consumption, water intake, and renal salt and water excretion. Rakova et al. report the unexpected observation that long-term high salt intake did not increase water consumption in humans but instead increased water retention...
May 1, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28405625/resistance-to-hypertension-mediated-by-intercalated-cells-of-the-collecting-duct
#15
Johannes Stegbauer, Daian Chen, Marcela Herrera, Matthew A Sparks, Ting Yang, Eva Königshausen, Susan B Gurley, Thomas M Coffman
The renal collecting duct (CD), as the terminal segment of the nephron, is responsible for the final adjustments to the amount of sodium excreted in urine. While angiotensin II modulates reabsorptive functions of the CD, the contribution of these actions to physiological homeostasis is not clear. To examine this question, we generated mice with cell-specific deletion of AT1A receptors from the CD. Elimination of AT1A receptors from both principal and intercalated cells (CDKO mice) had no effect on blood pressures at baseline or during successive feeding of low- or high-salt diets...
April 6, 2017: JCI Insight
https://www.readbyqxmd.com/read/28392446/the-asymmetric-dimethylarginine-mediated-inhibition-of-nitric-oxide-in-the-rostral-ventrolateral-medulla-contributes-to-regulation-of-blood-pressure-in-hypertensive-rats
#16
Xing Tan, Ji-Kui Li, Jia-Cen Sun, Pei-Lei Jiao, Yang-Kai Wang, Zhao-Tang Wu, Bing Liu, Wei-Zhong Wang
Nitric oxide (NO) contributes to the central control of cardiovascular activity. The rostral ventrolateral medulla (RVLM) has been recognized as a pivotal region for maintaining basal blood pressure (BP) and sympathetic tone. It is reported that asymmetric dimethylarginine (ADMA), characterized as a cardiovascular risk marker, is an endogenous inhibitor of nitric oxide synthesis. The present was designed to determine the role of ADMA in the RVLM in the central control of BP in hypertensive rats. In Sprague Dawley (SD) rats, microinjection of ADMA into the RVLM dose-dependently increased BP, heart rate (HR), and renal sympathetic never activity (RSNA), but also reduced total NO production in the RVLM...
April 7, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28384101/novel-therapeutic-approaches-of-natural-oil-from-black-seeds-and-its-underlying-mechanisms-against-kidney-dysfunctions-in-haloperidol-induced-male-rats
#17
Jacob K Akintunde, Opeyemi K Abubakar
BACKGROUND: Antipsychotic drugs could be nephrotoxic in schizophrenia patients. METHODS: The present study investigated the protective effect of oil from black seed on kidney dysfunctions using several biological approaches in adult rats. The animals were divided into six groups (n=10): normal control rats; haloperidol (HAL)-induced rats: induced rats were pre-, co- and post-treated with black seed oil (BSO), respectively, and the last group was treated with the oil only...
April 6, 2017: Drug Metabolism and Personalized Therapy
https://www.readbyqxmd.com/read/28363084/the-metabolic-syndrome-induces-early-changes-in%C3%A2-the-swine-renal-medullary-mitochondria
#18
Alfonso Eirin, John R Woollard, Christopher M Ferguson, Kyra L Jordan, Hui Tang, Stephen C Textor, Amir Lerman, Lilach O Lerman
The metabolic syndrome (MetS) is associated with nutrient surplus and kidney hyperfiltration, accelerating chronic renal failure. Mitochondria can be overwhelmed by substrate excess, leading to inefficient energy production and thereby tissue hypoxia. Mitochondrial dysfunction is emerging as an important determinant of renal damage, but whether it contributes to MetS-induced renal injury remains unknown. We hypothesized that early MetS induces kidney mitochondrial abnormalities and dysfunction, which would be notable in the vulnerable renal medulla...
June 2017: Translational Research: the Journal of Laboratory and Clinical Medicine
https://www.readbyqxmd.com/read/28356289/sex-specific-computational-models-of-the-spontaneously-hypertensive-rat-kidneys-factors-affecting-nitric-oxide-bioavailability
#19
Ying Chen, Jennfier C Sullivan, Aurélie Edwards, Anita T Layton
The goals of this study were to (i) develop a computational model of solute transport and oxygenation in the kidney of the female spontaneously hypertensive rat (SHR), and (ii) apply that model to investigate sex differences in nitric oxide (NO) levels in SHR and their effects on medullary oxygenation and oxidative stress. To accomplish these goals, we first measured NO synthase (NOS) NOS1 and NOS3 protein expression levels in the renal microvessels of male and female SHR. We found that the expression of both NOS1 and NOS3 is higher in the renal vasculature of females compared to males...
March 29, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28341428/renal-papillary-necrosis-in-patients-with-sickle-cell-disease-how-to-recognize-this-forgotten-diagnosis
#20
REVIEW
Michaël M E L Henderickx, Tim Brits, Karen De Baets, Mattias Seghers, Philip Maes, Dominique Trouet, Stefan De Wachter, Gunter De Win
INTRODUCTION: Renal papillary necrosis is not commonly seen in daily practice, but can have severe consequences when it is not diagnosed in time. It is known to be associated with sickle cell hemoglobinopathies; however a wide range of etiologies are possible, and it is therefore not the first diagnosis clinicians consider in patients with sickle cell disease who present with hematuria. METHODS: A literature search was performed to summarize the current knowledge about renal papillary necrosis associated with sickle cell disease...
March 7, 2017: Journal of Pediatric Urology
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