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https://www.readbyqxmd.com/read/29779025/differential-determinants-of-tubular-phosphate-reabsorption-insights-on-renal-excretion-of-phosphates-in-kidney-disease
#1
Nahid Tabibzadeh, Romuald Mentaverri, Maïté Daroux, Rafik Mesbah, Alexia Delpierre, Jean-Gabriel Paul, Valérie Deken, Ziad A Massy, Pierre Bataille
We assessed the tubular reabsorption of phosphate (TRP) and maximal renal threshold for phosphate reabsorption to glomerular filtration rate (TmPi/GFR) and their determinants in 64 stages 2-4 chronic kidney disease (CKD) patients in order to define the early changes in phosphate metabolism in CKD. In multivariable analysis, TmPi/GFR correlates were estimated GFR (eGFR), intact parathyroid hormone (iPTH), and hemoglobin (R2 = 0.417), while TRP correlates were eGFR, iPTH, 24-h phosphaturia, and calcitriol (R2 = 0...
May 18, 2018: American Journal of Nephrology
https://www.readbyqxmd.com/read/29779023/parathyroid-hormone-fibroblast-growth-factor-23-and-parameters-of-phosphate-reabsorption
#2
Kenneth R Phelps, Darius L Mason
BACKGROUND: The serum phosphorus concentration ([P]s) is the sum of EP/Ccr and TRP/Ccr, where Ccr is creatinine clearance and EP and TRP are rates of excretion and reabsorption of phosphate. In chronic kidney disease (CKD), parathyroid hormone (PTH) and fibroblast growth factor 23 (FGF23) mediate reduction of TRP/Ccr, and [PTH] and [FGF23] are linear functions of EP/Ccr. If controls and patients with CKD are considered together, TRP/Ccr is a hyperbolic function of EP/Ccr. Given these observations, we hypothesized that hyperbolas would describe relationships of phosphate reabsorption to [PTH] and [FGF23]...
May 18, 2018: American Journal of Nephrology
https://www.readbyqxmd.com/read/29778909/n-acetylcysteine-protects-against-diabetic-nephropathy-through-control-of-oxidative-and-nitrosative-stress-by-recovery-of-nitric-oxide-in-rats
#3
Guilherme B Nogueira, Giovana R Punaro, Clemerson S Oliveira, Fabiane R Maciel, Thamires O Fernandes, Deyse Y Lima, Adelson M Rodrigues, Margaret G Mouro, Sergio R R Araujo, Elisa M S Higa
The diabetes mellitus (DM) induces several changes, with substantial increase of reactive oxygen species (ROS). The ROS cause damage to systemic and renal microvasculature, which could be one of the mechanisms involved in the development of diabetic nephropathy (DN). The ROS modulate other substances like the nitric oxide (NO), a vasodilator with important role in the renal function. N-acetylcysteine (NAC) is an antioxidant that acts replenishing intracellular cysteine levels, which is essential for glutathione formation...
May 17, 2018: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/29777767/biglycan-is-a-new-high-affinity-ligand-for-cd14-in-macrophages
#4
Heiko Roedig, Madalina V Nastase, Helena Frey, Kristin Moreth, Jinyang Zeng-Brouwers, Chiara Poluzzi, Louise Tzung-Harn Hsieh, Christian Brandts, Simone Fulda, Malgorzata Wygrecka, Liliana Schaefer
Sterile inflammation is a therapeutic target in many diseases where it represents an important initiator of disease progression. However, the detailed mechanisms underlying its evolution and biological relevance are not yet completely elucidated. Biglycan, a prototype extracellular matrix-derived damage-associated molecular pattern, mediates sterile inflammation in macrophages through Toll-like receptor (TLR) 2 and/or TLR4-dependent signaling pathways. Here we discovered that soluble biglycan is a novel high-affinity ligand for CD14, a well-known GPI-anchored co-receptor for TLRs...
May 16, 2018: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/29777019/cellular-origin-and-functional-relevance-of-collagen-i-production-in-the-kidney
#5
Simone Buchtler, Alexandra Grill, Stefanie Hofmarksrichter, Petra Stöckert, Gabriela Schiechl-Brachner, Manuel Rodriguez Gomez, Sophia Neumayer, Kathrin Schmidbauer, Yvonne Talke, Barbara M Klinkhammer, Peter Boor, Alexander Medvinsky, Kerstin Renner, Hayo Castrop, Matthias Mack
Background Interstitial fibrosis is associated with chronic renal failure. In addition to fibroblasts, bone marrow-derived cells and tubular epithelial cells have the capacity to produce collagen. However, the amount of collagen produced by each of these cell types and the relevance of fibrosis to renal function are unclear. Methods We generated conditional cell type-specific collagen I knockout mice and used (reversible) unilateral ureteral obstruction and adenine-induced nephropathy to study renal fibrosis and function...
May 18, 2018: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/29776437/coenzyme-q10-combined-with-trimetazidine-in-the-prevention-of-contrast-induced-nephropathy-in-patients-with-coronary-heart-disease-complicated-with-renal-dysfunction-undergoing-elective-cardiac-catheterization-a-randomized-control-study-and-in-vivo-study
#6
Fei Chen, Fan Liu, Jingchao Lu, Xiuchun Yang, Bing Xiao, Yaqiong Jin, Jie Zhang
BACKGROUND: Contrast-induced nephropathy (CIN) is one of the common hospital-acquired acute renal failures. The purpose of this study was to investigate whether Coenzyme Q10 (CoQ10) and trimetazidine (TMZ) can prevent the occurrence of CIN after elective cardiac catheterization in patients with coronary artery disease complicated with renal dysfunction. METHODS: Consecutive coronary artery disease patients with renal insufficiency scheduled for coronary angiography were enrolled in randomized, paralleled, double-blind, controlled trial...
May 18, 2018: European Journal of Medical Research
https://www.readbyqxmd.com/read/29773381/cd44-targeted-hyaluronic-acid-curcumin-prodrug-protects-renal-tubular-epithelial-cell-survival-from-oxidative-stress-damage
#7
Jing-Bo Hu, Shu-Juan Li, Xu-Qi Kang, Jing Qi, Jia-Hui Wu, Xiao-Juan Wang, Xiao-Ling Xu, Xiao-Ying Ying, Sai-Ping Jiang, Jian You, Yong-Zhong Du
Based on the abnormally increased expression of CD44 receptors on renal tubule epithelial cells during ischemia/reperfusion-induced acute kidney injury (AKI), we developed a hyaluronic acid-curcumin (HA-CUR) polymeric prodrug targeting to epithelial cells and then relieving oxidative stress damages. The water solubility of HA-CUR was significantly enhanced and approximately 27-fold higher than that of CUR. Cellular uptake test showed HA-CUR was preferably internalized by H2 O2 -pretreated tubular epithelial (HK-2) cells compared with free CUR benefiting from the specific binding between HA and CD44 receptors...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29767638/pre-exposure-prophylaxis-with-tenofovir-disoproxil-fumarate-emtricitabine-and-kidney-tubular-dysfunction-in-hiv-uninfected-individuals
#8
Vasantha Jotwani, Rebecca Scherzer, David V Glidden, Megha Mehrotra, Patricia Defechereux, Albert Liu, Monica Gandhi, Michael Bennett, Steven G Coca, Chirag R Parikh, Robert M Grant, Michael G Shlipak
BACKGROUND: Pre-exposure prophylaxis (PrEP) with tenofovir disoproxil fumarate (TDF) and emtricitabine (FTC) is becoming increasingly adopted for HIV prevention. Tenofovir can cause proximal tubular damage and chronic kidney disease in HIV-infected persons, but little is known regarding its nephrotoxic potential among HIV-uninfected persons. In this study, we evaluated the effects of PrEP on urine levels of the following: α1-microglobulin (α1m), a marker of impaired tubular reabsorption; albuminuria, a measure of glomerular injury; and total proteinuria...
June 1, 2018: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/29767557/polycystin-1-dysfunction-impairs-electrolyte-and-water-handling-in-a-renal-pre-cystic-mouse-model-for-adpkd
#9
Eric H J Verschuren, Sami G Mohammed, Wouter N Leonhard, Caro Overmars-Bos, Kimberly A M Veraar, Joost G J Hoenderop, René J M Bindels, Dorien J M Peters, Francisco J Arjona
The PKD1 gene encodes polycystin-1 (PC1), a mechanosensor triggering intracellular responses upon urinary flow sensing in kidney tubular cells. Mutations in PKD1 lead to autosomal dominant polycystic kidney disease (ADPKD). The involvement of PC1 in renal electrolyte handling remains unknown since renal electrolyte physiology in ADPKD patients has only been characterized in cystic ADPKD. We thus studied the renal electrolyte handling in inducible kidney-specific Pkd1 knockout (iKsp-Pkd1-/-) mice manifesting a pre-cystic phenotype...
May 16, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29767399/a-decreased-soluble-klotho-level-with-normal-egfr-fgf23-serum-phosphate-and-fep-in-an-adpkd-patient-with-enlarged-kidneys-due-to-multiple-cysts
#10
Takahiro Kanai, Kazuhiro Shiizaki, Hiroyuki Betsui, Jun Aoyagi, Takanori Yamagata
Autosomal dominant polycystic kidney disease (ADPKD) is the most common hereditary renal disorder. ADPKD is characterized clinically by the presence of multiple bilateral renal cysts that lead to chronic renal failure. The cysts evolve from renal tubular epithelial cells that express the Klotho gene. Notably, Klotho acts as a co-receptor for fibroblast growth factor 23 (FGF23); in this context, it induces phosphaturia and maintains serum phosphate at a normal level. Many reports have shown that decreases in the soluble Klotho level and increases in the FGF23 level are associated with glomerular filtration rate (GFR) decline, but a recent study observed these changes in patient with normal eGFR...
May 16, 2018: CEN Case Reports
https://www.readbyqxmd.com/read/29763902/prognostic-factors-of-renal-involvement-in-systemic-sclerosis
#11
Edoardo Rosato, Antonietta Gigante, Biagio Barbano, Maria Ludovica Gasperini, Rosario Cianci, Maurizio Muscaritoli
BACKGROUND/AIMS: Renal involvement is common in systemic sclerosis (SSc), including asymptomatic reduction of glomerular filtration rate (GFR), increased renal resistance indices, scleroderma renal crisis (SRC) and ANCA-associated vasculitis. The aim was to evaluate type and evolution of renal involvement for a period of five years. METHODS: 121 SSc patients (100 F, 21 M) with mean age of 54.9 ± 13.8, disease duration of 9 ± 6 years, of which 62 had a diffused form and 59 limited form were enrolled...
May 10, 2018: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29759053/histopathologic-and-immunohistochemistry-findings-in-feline-renal-cell-carcinoma
#12
Isao Matsumoto, James K Chambers, Kazumi Nibe, Ryohei Kinoshita, Ryohei Nishimura, Hiroyuki Nakayama, Kazuyuki Uchida
The biological behavior and immunohistochemical features of feline renal cell carcinoma (RCC) have not been well characterized. In the present study, immunohistochemical examinations were performed in 12 feline cases of RCC. The RCC consisted of solid ( n = 2), solid-tubular ( n = 2), tubular ( n = 3), papillary ( n = 2), tubulopapillary ( n = 2), and sarcomatoid ( n = 1) type lesions. Of the cases with RCC, 1 developed metastatic disease and 6 cases had no evidence of recurrence at 80 to 2292 days after surgery...
January 1, 2018: Veterinary Pathology
https://www.readbyqxmd.com/read/29756720/a-novel-mutation-of-dent-s-disease-in-an-11-year-old-male-with-nephrolithiasis-and-nephrocalcinosis
#13
Ozlem Sancakli, Bahar Kulu, Onur Sakallioglu
Dent's disease is a rare X-linked recessive tubulopathy characterized by low molecular weight (LMW) proteinuria, hypercalciuria, nephrolcalcinosis or nephrolithiasis, proximal tubular dysfunction and renal failure in adulthood. Females are carriers and usually mildly affected. Progression to endstage renal failure are at the 3rd-5th decades of life in 30-80% of affected males. In the absence of therapy targeting for the molecular defect, the current care of patients with Dent's disease is supportive, focusing on the prevention of nephrolithiasis and nephrocalcinosis...
June 1, 2018: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/29756666/abnormal-lymphatic-vessel-development-is-associated-with-decreased-decidual-regulatory-t-cells-in-severe-preeclampsia
#14
Yun Ji Jung, Yejin Park, Hyun-Soo Kim, Hwa Jin Lee, Yoo-Na Kim, JoonHo Lee, Young-Han Kim, Yong-Sun Maeng, Ja-Young Kwon
PROBLEM: The lymphatic vasculature controls leukocytes trafficking and limits the adaptive immune response. In previous models of preeclampsia (PE), defective immune function caused by disruption of lymphangiogenesis was shown to be involved in the disease pathophysiology. Especially, the dysfunction of regulatory T cells (Treg) at the maternal-fetal interface may be one of the causes of severe PE. In particular, activation of Tregs to obtain immune tolerance requires adequate antigen presentation through the lymphatic system...
May 14, 2018: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/29754702/evaluating-renal-transplant-status-using-viscoelastic-response-visr-ultrasound
#15
Md Murad Hossain, Mallory R Selzo, Robert M Hinson, Leslie M Baggesen, Randal K Detwiler, Wui K Chong, Lauren M Burke, Melissa C Caughey, Melrose W Fisher, Sonya B Whitehead, Caterina M Gallippi
Chronic kidney disease is most desirably and cost-effectively treated by renal transplantation, but graft survival is a major challenge. Although irreversible graft damage can be averted by timely treatment, intervention is delayed when early graft dysfunction goes undetected by standard clinical metrics. A more sensitive and specific parameter for delineating graft health could be the viscoelastic properties of the renal parenchyma, which are interrogated non-invasively by Viscoelastic Response (VisR) ultrasound, a new acoustic radiation force (ARF)-based imaging method...
May 10, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29752569/widespread-expression-of-perilipin-5-in-normal-human-tissues-and-in-diseases-is-restricted-to-distinct-lipid-droplet-subpopulations
#16
Merita Hashani, Hagen Roland Witzel, Lena Maria Pawella, Judith Lehmann-Koch, Jens Schumacher, Gunhild Mechtersheimer, Martina Schnölzer, Peter Schirmacher, Wilfried Roth, Beate Katharina Straub
Diseases associated with the accumulation of lipid droplets are increasing in western countries. Lipid droplet biogenesis, structure and degradation are regulated by proteins of the perilipin family. Perilipin 5 has been shown to regulate basal lipolysis in oxidative tissues. We examine perilipin 5 in normal human tissues and in diseases using protein biochemical and microscopic techniques. Perilipin 5 was constitutively located at small lipid droplets in skeletal myocytes, cardiomyocytes and brown adipocytes...
May 11, 2018: Cell and Tissue Research
https://www.readbyqxmd.com/read/29751972/notch3-orchestrates-epithelial-and-inflammatory-responses-to-promote-acute-kidney-injury
#17
Panagiotis Kavvadas, Zela Keuylian, Niki Prakoura, Sandrine Placier, Aude Dorison, Christos E Chadjichristos, Jean-Claude Dussaule, Christos Chatziantoniou
Acute kidney injury is a major risk factor for subsequent chronic renal and/or cardiovascular complications. Previous studies have shown that Notch3 was de novo expressed in the injured renal epithelium in the early phases of chronic kidney disease. Here we examined whether Notch3 is involved in the inflammatory response and the epithelial cell damage that typifies ischemic kidneys using Notch3 knockout mice and mice with short-term activated Notch3 signaling (N3ICD) in renal epithelial cells. After ischemia/reperfusion, N3ICD mice showed exacerbated infiltration of inflammatory cells and severe tubular damage compared to control mice...
May 8, 2018: Kidney International
https://www.readbyqxmd.com/read/29746862/induction-of-inactive-tgf-%C3%AE-1-monomer-formation-by-hydrogen-sulfide-contributes-to-its-suppressive-effects-on-ang-ii-and-tgf-%C3%AE-1-induced-emt-in-renal-tubular-epithelial-cells
#18
Yong Huang, Zhen Zhang, Yanru Huang, Zhimin Mao, Xiawen Yang, Yuki Nakamura, Norifumi Sawada, Takahiko Mitsui, Masayuki Takeda, Jian Yao
Hydrogen sulfide (H2 S), an endogenous gas mediator with multifaced biological functions, has been shown to be effective in the prevention and treatment of renal sclerosis in several models of chronic renal diseases. The mechanisms involved are still unclear. Given that Ang II- and TGF-β-induced renal tubular epithelial-mesenchymal transition (EMT) is a pivotal cellular event leading to renal sclerosis, we examined whether and how H2 S intervened the processes of EMT. Ang II stimulated EMT in renal tubular epithelial cells, as indicated by the increased level of α-smooth muscle actin and a decreased level of E-cadherin...
May 7, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29746703/s100a8-a9-promotes-parenchymal-damage-and-renal-fibrosis-in-obstructive-nephropathy
#19
Alessandra Tammaro, Sandrine Florquin, Mascha Brok, Nike Claessen, Loes M Butter, Gwendoline J D Teske, Onno J de Boer, Thomas Vogl, Jaklien C Leemans, Mark C Dessing
Despite advances in our understanding of the mechanisms underlying progression of chronic kidney disease and the development of fibrosis, only limited efficacious therapies exist. The calcium binding protein S100A8/A9, is a damage-associated molecular pattern which can activate TLR4 or RAGE. Activation of these receptors is involved in the progression of renal fibrosis, however the role of S100A8/A9 herein remains unknown. Therefore, we analyzed S100A8/A9 expression in patients and mice with obstructive nephropathy and subjected wild-type and S100A9 KO mice lacking the heterodimer S100A8/A9 to Unilateral Ureteral Obstruction (UUO)...
May 10, 2018: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/29746306/source-and-microenvironmental-regulation-of-erythropoietin-in-the-kidney
#20
Karen A Nolan, Roland H Wenger
PURPOSE OF REVIEW: Historically, the identity of O2-sensing renal erythropoietin (Epo)-producing (REP) cells was a matter of debate. This review summarizes how recent breakthroughs in transgenic mouse and in-situ hybridization techniques have facilitated sensitive and specific detection of REP cells and accelerated advancements in the understanding of the regulation of renal Epo production in health and disease. RECENT FINDINGS: REP cells are a dynamically regulated unique subpopulation of tubulointerstitial cells with features of fibroblasts, pericytes and neurons...
May 8, 2018: Current Opinion in Nephrology and Hypertension
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