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American Journal of Physiology. Renal Physiology

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https://www.readbyqxmd.com/read/29141941/insights-from-direct-renal-insulin-infusion-a-new-hammer-for-an-age-old-nail
#1
Jonathan M Nizar, Vivek Bhalla
N/A.
November 15, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29141940/the-effects-of-different-storage-solutions-on-renal-ischemia-tolerance-after-kidney-transplantation-in-mice
#2
Lei Wang, Jin Wei, Shan Jiang, Hui-Hua Li, Liying Fu, Jie Zhang, Ruisheng Liu
Cold storage is the most prevalent method for graft preservation in kidney transplantation (KTX). The protective effects of various preservation solutions have been extensively studied in both clinical trials and experimental animal models. However, a paucity of studies examined the effect of different preservation solutions on graft function in mouse KTX, in addition, the tolerance of the transplanted grafts to further insult has not been evaluated, which were the objectives of the present study. We performed mouse KTX in three groups with the donor kidneys preserved in different solutions for 60 minutes: saline, mouse serum, and University of Wisconsin (UW) solution...
November 15, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29141939/dapagliflozin-in-focal-segmental-glomerulosclerosis-a-combined-human-rodent-pilot-study
#3
Harindra Rajasekeran, Heather N Reich, Michelle A Hladunewich, Daniel Cattran, Julie A Lovshin, Yuliya Lytvyn, Petter Bjornstad, Vesta Lai, Josephine Tse, Leslie Cham, Syamantak Majumder, Bridgit B Bowskill, M Golam Kabir, Suzanne L Advani, Ian W Gibson, Manish M Sood, Andrew Advani, David Z I Cherney
BACKGROUND: Focal segmental glomerulosclerosis (FSGS) is an important cause of non-diabetic chronic kidney disease (CKD). Sodium glucose cotransporter-2 inhibition (SGLT2i) therapy attenuates the progression of diabetic nephropathy, but it remains unclear whether SGLT2i provides renoprotection in non-diabetic CKD such as FSGS. OBJECTIVE: The primary aim of this pilot study was to determine the effect of 8 weeks of dapagliflozin on GFR in humans and in experimental FSGS...
November 15, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29141938/stimulation-of-the-sensory-pudendal-nerve-increases-bladder-capacity-in-the-rat
#4
James A Hokanson, Christopher L Langdale, Arun Sridhar, Warren M Grill
Pudendal nerve stimulation is a promising treatment approach for lower urinary tract dysfunction, including symptoms of overactive bladder. Despite some promising clinical studies, there remain many unknowns as to how best to stimulate the pudendal nerve to maximize therapeutic efficacy. We quantified changes in bladder capacity and voiding efficiency during single-fill cystometry in response to electrical stimulation of the sensory branch of the pudendal nerve in urethane-anesthetized female Wistar rats. Increases in bladder capacity were dependent on both stimulation amplitude and rate...
November 15, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29141937/novel-differences-in-renal-gene-expression-in-a-diet-induced-obesity-model
#5
Victoria L Halperin Kuhns, Jennifer L Pluznick
Obesity is a significant risk factor for both chronic kidney disease and end stage renal disease. To better understand disease development, we sought to identify novel genes differentially expressed early in disease progression. We first confirmed that mice fed a high-fat (HF) diet exhibit early signs of renal injury including hyperfiltration. We then performed RNA Seq using renal cortex RNA from C57Bl/6 male mice fed either HF or control (Ctrl) diet. We identified 1134 genes differentially expressed in the cortex on HF versus Ctrl, of which 31 genes were selected for follow up analysis...
November 15, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29117997/metformin-an-anti-proliferative-agent-and-methylation-regulator-in-treating-prostatic-disease
#6
Zongwei Wang, Aria F Olumi
Existing drugs that have been used in clinical practice for other purposes can prove useful for reutilization, since much of the safety profile, pharmacokinetics have been completed. Therefore, the drugs can enter clinical practice for variety of causes with less regulatory burden. Metformin may prove to be such a drug where it may have a role in other diseases, beside management of diabetes. In this perspective, we provide our finding and understanding of metformin as an alternate way to treat urological abnormal proliferation...
November 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29117996/effect-of-isolated-ultrafiltration-and-isovolemic-dialysis-on-myocardial-perfusion-and-left-ventricular-function-assessed-with-13n-nh3-pet-and-echocardiography
#7
Solmaz Assa, Hannie Kuipers, Esmee Ettema, Carlo A Gaillard, Wim P Krijnen, Yoran M Hummel, Adriaan A Voors, Joost P van Melle, Ralf Westerhuis, Antoon Willemsen, Riemer H J A Slart, Casper Fm Franssen
Hemodialysis is associated with a fall in myocardial perfusion and may induce regional left ventricular (LV) systolic dysfunction. The pathophysiology of this entity is incompletely understood and the contribution of ultrafiltration and diffusive dialysis has not been studied. We investigated the effect of isolated ultrafiltration and isovolemic dialysis on myocardial perfusion and LV function. Eight patients (7 male, age 55±18 years) underwent 60 min of isolated ultrafiltration and 60 min of isovolemic dialysis in randomized order...
November 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29117995/the-role-of-mitochondria-derived-reactive-oxygen-species-in-microvascular-dysfunction-in-chronic-kidney-disease
#8
Danielle L Kirkman, Bryce J Muth, Meghan G Ramick, Raymond R Townsend, David G Edwards
Cardiovascular disease is the leading cause of mortality in Chronic Kidney Disease (CKD). Mitochondrial dysfunction secondary to CKD is a potential source of oxidative stress that may impair vascular function. This study sought to determine if mitochondria derived reactive oxygen species contribute to microvascular dysfunction in Stage 3-5 CKD. Cutaneous vasodilation in response to local heating was assessed in 20 CKD patients (60±13 years; eGFR 46±13ml/kg/1.73m2) and eleven matched healthy participants (58±2 years; eGFR>90ml/kg/1...
November 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29117994/role-of-adenosine-1a-receptor-signaling-on-gfr-early-after-the-induction-of-sepsis
#9
Jonathan M Street, Erik H Koritzinsky, Tiffany R Bellomo, Xuzhen Hu, Peter S T Yuen, Robert A Star
Sepsis and acute kidney injury (AKI) synergistically increase morbidity and mortality in the ICU. How sepsis reduces GFR and causes AKI is poorly understood; one proposed mechanism includes tubuloglomerular feedback (TGF). When sodium reabsorption by the proximal tubules is reduced in normal animals, the macula densa senses increased luminal sodium chloride, then adenosine 1a receptor (A1aR) signaling triggers tubuloglomerular feedback, reducing GFR through afferent arteriole vasoconstriction. We measured GFR and systemic hemodynamics early during cecal ligation and puncture-induced sepsis in wild-type and A1aR knockout mice...
November 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29092848/intrarenal-activation-of-endothelin-type-b-receptors-improves-kidney-oxygenation-in-type-1-diabetic-rats
#10
Stephanie Franzén, Liselotte Pihl, Angelica Fasching, Fredrik Palm
About one third of patients with type 1 diabetes develops kidney disease. The mechanism is largely unknown, but intrarenal hypoxia has been proposed as a unifying mechanism for chronic kidney disease including diabetic nephropathy. The endothelin system has recently been demonstrated to regulate oxygen availability in the diabetic kidney via a pathway involving endothelin type A receptors (ETA-R). These receptors mainly mediate vasoconstriction and tubular sodium retention, and inhibition of ETA-R improves intrarenal oxygenation in the diabetic kidney...
November 1, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29092847/measuring-rat-kidney-glomerular-number-and-size-in-vivo-with-mri
#11
Edwin J Baldelomar, Jennifer R Charlton, Scott C Beeman, Kevin M Bennett
Nephron number is highly variable in humans and is thought to play an important role in renal health. Chronic kidney disease (CKD) is the result of too few nephrons to maintain homeostasis. Currently, nephron number estimates can only be determined invasively or as a terminal assessment. Due to a lack of tools to measure and track nephron number in the living, the early stages of CKD often go unrecognized, preventing early intervention that might halt the progression of CKD. In this work, we present a technique to directly measure glomerular number (Nglom) and volume in vivo in the rat kidney (n=8) using MRI enhanced with the novel contrast agent cationized ferritin (CFE-MRI)...
November 1, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29092846/bdnf-overexpression-in-bladder-induces-neuronal-changes-to-mediate-bladder-overactivity
#12
Mahendra Kashyap, Subrata Pore, William C de Groat, Christopher Chermansky, Naoki Yoshimura, Pradeep Tyagi
Elevated levels of brain derived neurotrophic factor (BDNF) in urine of overactive bladder (OAB) patients support the association of BDNF with OAB symptoms, but the causality is not known. Here, we investigated the functionality of BDNF overexpression in rat bladder following bladder wall transfection of either BDNF or luciferase transgenes (10µg). A week after transfection, BDNF overexpression in bladder tissue and elevation of urine BDNF levels was observed together with increased transcript of BDNF, its cognate receptors (TrkB & p75NTR) and downstream PLCγ isoforms in bladder...
November 1, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29070575/saphenous-nerve-stimulation-normalizes-bladder-underactivity-induced-by-tibial-nerve-stimulation-in-cats
#13
Shun Li, Xing Li, Katherine Theisen, Jeffrey Browning, Bing Shen, Jicheng Wang, James R Roppolo, William C de Groat, Changfeng Tai
This study in α-chloralose anesthetized cats aimed at investigating the bladder responses to saphenous nerve stimulation (SNS). A urethral catheter was used to infuse the bladder with saline and to record changes in bladder pressure. With the bladder fully distended, SNS at 1 Hz frequency and an intensity slightly below the threshold (T) for inducing an observable motor response of the hindlimb muscles induced large amplitude (40-150 cmH2O) bladder contractions. Application of SNS (1 Hz, 2-4T) during cystometrograms (CMGs), when the bladder was slowly (1-3 ml/min) infused with saline, significantly (p<0...
October 25, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29070574/cell-adhesion-molecule-1-cadm1-shedding-induces-apoptosis-of-renal-epithelial-cells-and-exacerbates-human-nephropathies
#14
Takashi Kato, Man Hagiyama, Yasutoshi Takashima, Azusa Yoneshige, Akihiko Ito
Chronic kidney disease (CKD) is an important problem throughout the world, associated with the increase of blood urea nitrogen (BUN) and serum creatinine (sCre), and renal tubular injuries. It is crucial to elucidate the molecular mechanisms of renal injuries in order to identify the new therapeutics and early diagnostic methods. We focused on cell adhesion molecule-1 (CADM1) protein. CADM1, its isoform SP4, is expressed in the epithelial cells of various tissues including renal distal tubules, localized on the lateral cell membrane, mediates cell-cell adhesion via trans-homophilic binding, and interacts with various proteins...
October 25, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29070573/mir-34c-5p-and-camkii-are-involved-in-aldosterone-induced-fibrosis-in-kidney-collecting-duct-cells
#15
Eui-Jung Park, Hyun Jun Jung, Hyo-Jung Choi, Jeong-In Cho, Hye-Jeong Park, Tae-Hwan Kwon
Mineralocorticoids trigger a pro-fibrotic process in kidney. In mouse cortical collecting duct cells (mpkCCDc14 cells), the present study addressed two main questions: 1) what are miRNAs and their target genes changed by aldosterone? and 2) what do miRNAs in response to aldosterone regulate signaling pathways related to fibrosis? Microarray chip assay was done in cells in the absence or presence of aldosterone treatment (10(-6)M, 3 d). The candidate miRNAs were identified by the criteria of more than 30% of fold-change among the significantly changed miRNAs (P value < 0...
October 25, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29070572/glucagon-like-peptide-1-analog-prevents-obesity-related-glomerulopathy-by-inhibiting-excessive-autophagy-in-podocytes
#16
HongLei Guo, Bin Wang, HongMei Li, LiLu Ling, Jianying Niu, Yong Gu
AIM: To investigate the role of glucagon-like peptide-1 analog (GLP-1) in high fat diet-induced obesity-related glomerulopathy (ORG). METHODS: Male C57BL/6 mice fed a high fat diet for 12 weeks were treated with GLP-1 (200 μg/kg) or 0.9% saline for 4 weeks. Fasting blood glucose and insulin and the expression of podocin, nephrin, phosphoinositide 3-kinase (PI3K), glucose transporter type (Glut4), and microtubule-associated protein 1A/1B-light chain 3 (LC3) were assayed...
October 25, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29070571/lithium-induces-aerobic-glycolysis-and-glutaminolysis-in-collecting-duct-principal-cells
#17
Mohammad Alsady, Theun de Groot, Marleen Louise Adriënne Kortenoeven, Claudia Carmone, Kim Neijman, Melissa Bekkenkamp-Grovenstein, Udo Engelke, Ron Wevers, Ruben Baumgarten, Ron Korstanje, Peter M T Deen
Lithium, given to bipolar disorder patients, causes nephrogenic diabetes insipidus (Li-NDI), a urinary concentrating defect. Li-NDI is due to downregulation of principal cell AQP2 expression, which coincides with principal cell proliferation. The metabolic effect of lithium on principal cells, however, is unknown and investigated here. Earlier, we have shown that the carbonic anhydrase (CA) inhibitor acetazolamide attenuated Li-induced downregulation in mouse collecting duct (mpkCCD) cells. Of the eight CAs present in mpkCCD cells, siRNA and drug treatments showed that downregulation of CA9 and to some extent CA12 attenuated Li-induced AQP2 downregulation...
October 25, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29070570/hypoxia-reoxygenation-enhances-murine-afferent-arteriolar-vasoconstriction-by-angiotensin-ii
#18
Tamara Margit Pahlitzsch, Zhi Zhao Liu, Amira Al-Masri, Diana Braun, Stefanie Dietze, Pontus B Persson, Wolf-Hagen Schunck, Maximilian Blum, Eckehardt Kupsch, Marion Ludwig, Andreas Patzak
We tested the hypothesis that hypoxia/reoxygenation (H/R) augments vasoreactivity to angiotensin II (Ang II). In particular, we compared an in situ live kidney slice model with isolated afferent arterioles (C57Bl6 mice) to assess the impact of tubules on microvessel response. H&E staining was used to estimate slice viability. Arterioles in the slices were located by DIC microscopy, and responses to vasoactive substances were assessed. Cytosolic calcium transients and NADPH oxidase mRNA expression were studied in isolated afferent arterioles...
October 25, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29070569/dexamethasone-enhances-vasopressin-induced-aquaporin-2-gene-expression-in-the-mpkccd-cells
#19
Kuang-Ting Kuo, Chan-Wei Yang, Ming-Jiun Yu
The cortical collecting duct cell (mpkCCD) has been an instrumental cell model for studying vasopressin-mediated aquaporin-2 regulation. This cell line was first developed by the Vandewalle's group from a transgenic mouse carrying the transforming SV40 antigens driven by the pyruvate kinase promoter. To immortalize the cells, four hormone supplements (dexamethasone, epidermal growth factor, insulin and triiodothyronine) were used to enhance SV40 antigen expression; however, these hormones appear to have various effects on aquaporin-2 gene expression in the cells...
October 25, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29070568/il-33-deficiency-slows-cancer-growth-but-does-not-protect-against-cisplatin-induced-aki-in-mice-with-cancer
#20
Kameswaran Ravichandran, Sara Holditch, Carolyn N Brown, Qian Wang, Abdullah Ozkok, Mary Cm Weiser-Evans, Raphael A Nemenoff, Makoto Miyazaki, Heather Thiessen-Philbrook, Chirag R Parikh, Danica Ljubanovic, Charles Louis Edelstein
The effect of IL-33 deficiency on AKI and cancer growth in a 4 week model of cisplatin-induced AKI in mice with cancer was determined. Mice were injected subcutaneously with murine lung cancer cells. Ten days later, cisplatin (10 mg/kg/week) was administered weekly for 4 weeks. The increase in kidney IL-33 preceded the AKI and tubular injury suggesting that IL-33 may play a causative role. However, the increase in serum creatinine, BUN, serum NGAL, ATN and apoptosis scores in the kidney in cisplatin-induced AKI was the same in wild type and IL-33 deficient mice...
October 25, 2017: American Journal of Physiology. Renal Physiology
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