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https://www.readbyqxmd.com/read/29129692/prmt1-mediates-podocyte-injury-and-glomerular-fibrosis-through-phosphorylation-of-erk-pathway
#1
Zhu Yu
Diabetic nephropathy (DN) is characterized by a change of glomerular structure and dysfunction of filtration barrier, which significantly accompanied by podocytes apoptosis and glomerular fibrosis. Angiotensin Ⅱ(Ang Ⅱ) induced activation of ERK1/2 signaling plays important roles in causing apoptosis of podocytes in DN kidneys. Previous studies have shown that PRMT1 have a pro-inflammatory function through activating ERK1/2 signaling pathway during development of chronic pulmonary disease, However, its role in DN development has not been investigated...
November 9, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29124787/reduced-tubular-degradation-of-glomerular-filtered-plasma-albumin-is-a-common-feature-in-acute-and-chronic-kidney-disease
#2
Yingjie Han, Nguyen D K Ly, Greg H Tesch, Philip Poronnik, David J Nikolic-Paterson
Tubular epithelial cells take up and degrade plasma albumin filtered by the glomerulus. Tubular damage resulting in reduced albumin uptake or degradation has been suggested as one mechanism contributing to albuminuria in kidney disease. This study investigated whether albumin uptake or degradation is altered in acute and chronic glomerular disease. Mouse models of acute glomerular injury (anti-GBM disease and LPS-induced albuminuria) and chronic disease (streptozotocin-induced diabetes and db/db mice) were examined...
November 10, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29114004/dysproteinemias-and-glomerular-disease
#3
Nelson Leung, Maria E Drosou, Samih H Nasr
Dysproteinemia is characterized by the overproduction of an Ig by clonal expansion of cells from the B cell lineage. The resultant monoclonal protein can be composed of the entire Ig or its components. Monoclonal proteins are increasingly recognized as a contributor to kidney disease. They can cause injury in all areas of the kidney, including the glomerular, tubular, and vascular compartments. In the glomerulus, the major mechanism of injury is deposition. Examples of this include Ig amyloidosis, monoclonal Ig deposition disease, immunotactoid glomerulopathy, and cryoglobulinemic GN specifically from types 1 and 2 cryoglobulins...
November 7, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/29093269/b-cell-derived-il-4-acts-on-podocytes-to-induce-proteinuria-and-foot-process-effacement
#4
Alfred Hj Kim, Jun-Jae Chung, Shreeram Akilesh, Ania Koziell, Sanjay Jain, Jeffrey B Hodgin, Mark J Miller, Thaddeus S Stappenbeck, Jeffrey H Miner, Andrey S Shaw
The efficacy of B cell depletion therapies in diseases such as nephrotic syndrome and rheumatoid arthritis suggests a broader role in B cells in human disease than previously recognized. In some of these diseases, such as the minimal change disease subtype of nephrotic syndrome, pathogenic antibodies and immune complexes are not involved. We hypothesized that B cells, activated in the kidney, might produce cytokines capable of directly inducing cell injury and proteinuria. To directly test our hypothesis, we targeted a model antigen to the kidney glomerulus and showed that transfer of antigen-specific B cells could induce glomerular injury and proteinuria...
November 2, 2017: JCI Insight
https://www.readbyqxmd.com/read/29092847/measuring-rat-kidney-glomerular-number-and-size-in-vivo-with-mri
#5
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/29061448/scorpions-pectines-idiosyncratic-chemo-and-mechanosensory-organs
#6
REVIEW
Harald Wolf
Scorpions possess specialised chemosensory appendages, the pectines. These comb-shaped limbs are located ventrally behind the walking legs. Like the antennae of mandibulate arthropods, they also serve mechanosensory function. However, more than 90% of the sometimes well above 100,000 sensory neurons projecting from a pectine to the central nervous system are chemosensory. There are two primary projection neuropils. The posterior one, immediately adjacent to the pectine nerve entrance, has an intriguing substructure reminiscent of the olfactory glomeruli observed in the primary chemosensory neuropils of many arthropods and indeed of most bilaterian animals...
October 20, 2017: Arthropod Structure & Development
https://www.readbyqxmd.com/read/29049388/an-inducible-mouse-model-of-podocin-mutation-related-nephrotic-syndrome
#7
Mansoureh Tabatabaeifar, Tanja Wlodkowski, Ivana Simic, Helga Denc, Geraldine Mollet, Stefanie Weber, John Julius Moyers, Barbara Brühl, Michael Joseph Randles, Rachel Lennon, Corinne Antignac, Franz Schaefer
Mutations in the NPHS2 gene, encoding podocin, cause hereditary nephrotic syndrome. The most common podocin mutation, R138Q, is associated with early disease onset and rapid progression to end-stage renal disease. Knock-in mice carrying a R140Q mutation, the mouse analogue of human R138Q, show developmental arrest of podocytes and lethal renal failure at neonatal age. Here we created a conditional podocin knock-in model named NPHS2 R140Q/-, using a tamoxifen-inducible Cre recombinase, which permits to study the effects of the mutation in postnatal life...
2017: PloS One
https://www.readbyqxmd.com/read/29046312/relaxin-mediated-renal-vasodilation-in-the-rat-is-associated-with-falls-in-glomerular-blood-pressure
#8
Aihua Deng, Kirk P Conrad, Chris Baylis
Relaxin (RLX) is a pleiotropic peptide hormone with marked renal vasodilatory actions which are physiologically important during pregnancy. RLX also has potent antifibrotic actions and is being tested therapeutically in various fibrotic diseases including chronic kidney disease (CKD). Since renal vasodilation may expose the glomerulus to increased blood pressure (PGC), which exacerbates progression of CKD, we assessed the glomerular hemodynamic actions of RLX when administered acutely (75 min; 0.89 µg/100g body weight/hr, iv) and chronically (1...
October 18, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29044883/clinical-benefit-and-residual-kidney-function-of-en-bloc-nephrectomy-for-perirenal-retroperitoneal-sarcoma
#9
Chan Woo Cho, Kyo Won Lee, Hyojun Park, Hyung Joon Kim, Jae Berm Park, Yoon-La Choi, Jeong Il Yu, Su Jin Lee, Dong Il Choi, Sung Joo Kim
AIM: The purpose of this study was to evaluate the efficacy of en bloc nephrectomy for perirenal retroperitoneal sarcoma (RPS) with respect to postoperative kidney function and oncological benefits. METHODS: We performed a comparative study of 114 patients undergoing surgery for primary RPS, classifying cases as nephrectomy (NPX, n = 65) versus no nephrectomy (no-NPX, n = 49). The Δ and % change between preoperative and postoperative estimated glomerulus filtration rate (eGFR) were analyzed to compare renal function changes after surgery...
October 18, 2017: Asia-Pacific Journal of Clinical Oncology
https://www.readbyqxmd.com/read/29038743/mature-induced-pluripotent-stem-cell-derived-human-podocytes-reconstitute-kidney-glomerular-capillary-wall-function-on-a-chip
#10
Samira Musah, Akiko Mammoto, Thomas C Ferrante, Sauveur S F Jeanty, Mariko Hirano-Kobayashi, Tadanori Mammoto, Kristen Roberts, Seyoon Chung, Richard Novak, Miles Ingram, Tohid Fatanat-Didar, Sandeep Koshy, James C Weaver, George M Church, Donald E Ingber
An in vitro model of the human kidney glomerulus - the major site of blood filtration - could facilitate drug discovery and illuminate kidney-disease mechanisms. Microfluidic organ-on-a-chip technology has been used to model the human proximal tubule, yet a kidney-glomerulus-on-a-chip has not been possible because of the lack of functional human podocytes - the cells that regulate selective permeability in the glomerulus. Here, we demonstrate an efficient (> 90%) and chemically defined method for directing the differentiation of human induced pluripotent stem (hiPS) cells into podocytes that express markers of the mature phenotype (nephrin+, WT1+, podocin+, Pax2-) and that exhibit primary and secondary foot processes...
2017: Nature biomedical engineering
https://www.readbyqxmd.com/read/29038391/embryohistiogenesis-of-vascular-tufts-of-glomeruli-a-possible-hypothesis
#11
Shahriar Dabiri, Mohammad Mehdi Moeini-Aghtaei, Bahram Dabiri
INTRODUCTION: Embryogenesis of the kidney glomeruli, especially its vascular component, has not been well documented. Glomeruli capillary tuft is surrounded and enveloped by visceral epithelial cells, which is a unique portal system that connects afferent with efferent arteriole without interaction with venular circulation. We hypothesized that the portal system embryologically has developed by extension of the intima of afferent arteriole into the stroma of glomerulus. We also hypothesized that juxtaglomeruli apparatus was developed from remnants of smooth muscle cells of the media of afferent arteriole at the anastomosing site with the Bowman capsule entrance...
October 2017: Iranian Journal of Kidney Diseases
https://www.readbyqxmd.com/read/29037908/new-insights-in-the-pathogenesis-of-immunoglobulin-a-vasculitis-henoch-sch%C3%A3-nlein-purpura
#12
REVIEW
Marieke H Heineke, Aranka V Ballering, Agnès Jamin, Sanae Ben Mkaddem, Renato C Monteiro, Marjolein Van Egmond
Immunoglobulin A vasculitis (IgAV), also referred to as Henoch-Schönlein purpura, is the most common form of childhood vasculitis. The pathogenesis of IgAV is still largely unknown. The disease is characterized by IgA1-immune deposits, complement factors and neutrophil infiltration, which is accompanied with vascular inflammation. Incidence of IgAV is twice as high during fall and winter, suggesting an environmental trigger associated to climate. Symptoms can resolve without intervention, but some patients develop glomerulonephritis with features similar to IgA nephropathy that include hematuria, proteinuria and IgA deposition in the glomerulus...
October 14, 2017: Autoimmunity Reviews
https://www.readbyqxmd.com/read/29023056/ameliorative-effect-of-arctium-lappa-against-cadmium-genotoxicity-and-histopathology-in-kidney-of-wistar-rat
#13
Asma Suliman Al-Gebaly
BACKGROUND AND OBJECTIVE: Cadmium (Cd) is a non-essential metal whose dispersion in the environment has increased recently, Cd may enhance cell oxidative stress that leads to DNA damage and apoptotic cell death. The study aimed to evaluate the antioxidative capability of Burdock root 'Arctium lappa' on cadmium-induced oxidative stress and histopathology of the kidney of Wistar rats. METHODOLOGY: Cadmium was applied in a form of cadmium chloride to three groups (15 mg Cd kg-1) for five weeks with two groups pre-treated with 'Arctium lappa' administration, 100 and 200 mg kg-1 b...
2017: Pakistan Journal of Biological Sciences: PJBS
https://www.readbyqxmd.com/read/28966119/wt1-is-necessary-for-the-proliferation-and-migration-of-cells-of-renin-lineage-following-kidney-podocyte-depletion
#14
Natalya V Kaverina, Diana G Eng, Andrea D Largent, Ilse Daehn, Anthony Chang, Kenneth W Gross, Jeffrey W Pippin, Peter Hohenstein, Stuart J Shankland
Wilms' tumor suppressor 1 (WT1) plays an important role in cell proliferation and mesenchymal-epithelial balance in normal development and disease. Here, we show that following podocyte depletion in three experimental models, and in patients with focal segmental glomerulosclerosis (FSGS) and membranous nephropathy, WT1 increased significantly in cells of renin lineage (CoRL). In an animal model of FSGS in RenWt1(fl/fl) reporter mice with inducible deletion of WT1 in CoRL, CoRL proliferation and migration to the glomerulus was reduced, and glomerular disease was worse compared with wild-type mice...
October 10, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28955723/prenatal-and-early-postnatal-odorant-exposure-heightens-odor-evoked-mitral-cell-responses-in-the-mouse-olfactory-bulb
#15
Annie Liu, Nathaniel N Urban
Early sensory experience shapes the anatomy and function of sensory circuits. In the mouse olfactory bulb (OB), prenatal and early postnatal odorant exposure through odorized food (food/odorant pairing) not only increases the volume of activated glomeruli but also increases the number of mitral and tufted cells (M/TCs) connected to activated glomeruli. Given the importance of M/TCs in OB output and in mediating lateral inhibitory networks, increasing the number of M/TCs connected to a single glomerulus may significantly change odorant representation by increasing the total output of that glomerulus and/or by increasing the strength of lateral inhibition mediated by cells connected to the affected glomerulus...
September 2017: ENeuro
https://www.readbyqxmd.com/read/28947000/fourier-based-quantification-of-renal-glomeruli-size-using-hough-transform-and-shape-descriptors
#16
Sohrab Najafian, Borhan Beigzadeh, Mohammad Riahi, Fatemeh Khadir Chamazkoti, Mahdi Pouramir
BACKGROUND AND OBJECTIVE: Analysis of glomeruli geometry is important in histopathological evaluation of renal microscopic images. Due to the shape and size disparity of even glomeruli of same kidney, automatic detection of these renal objects is not an easy task. Although manual measurements are time consuming and at times are not very accurate, it is commonly used in medical centers. In this paper, a new method based on Fourier transform following usage of some shape descriptors is proposed to detect these objects and their geometrical parameters...
November 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28946766/salvia-miltiorrhiza-lipophilic-fraction-attenuates-oxidative-stress-in-diabetic-nephropathy-through-activation-of-nuclear-factor-erythroid-2-related-factor-2
#17
Lin An, Mei Zhou, Faiz M M T Marikar, Xue-Wen Hu, Qiu-Yun Miao, Ping Li, Jun Chen
Diabetic nephropathy (DN) is a common cause of chronic kidney disease and end-stage renal disease, which can be triggered by oxidative stress. In this study, we investigated the renoprotective effect of the ethyl acetate extract of Salvia miltiorrhiza (EASM) on DN and examined the underlying molecular mechanism. We observed that EASM treatment attenuated metabolic abnormalities associated with hyperglycemic conditions in the experimental DN model. In streptozotocin (STZ)-induced mice, EASM treatment reduced albuminuria, improved renal function and alleviated the pathological alterations within the glomerulus...
2017: American Journal of Chinese Medicine
https://www.readbyqxmd.com/read/28931470/free-light-chains-eclectic-multipurpose-biomarker
#18
REVIEW
Umberto Basile, Francesca Gulli, Laura Gragnani, Cecilia Napodano, Krizia Pocino, Gian Ludovico Rapaccini, Michele Mussap, Anna Linda Zignego
The production of antibodies is accompanied by a slight excess of synthesis of κ and λ immunoglobulin light chains; small amounts of them are released in the peripheral blood and can also be found in various body fluids, such as synovial fluid, cerebrospinal fluid, urine and saliva. They are rapidly filtered by the glomerulus and >99% are reabsorbed from the cells of the proximal convoluted tubule, making them present in the urine in only trace amounts. The production of an excess of protein without a reason or a specific function in a biological system is rare...
September 18, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28916834/ultrastructural-characterization-of-the-glomerulopathy-in-alport-mice-by-helium-ion-scanning-microscopy-him
#19
Kenji Tsuji, Hani Suleiman, Jeffrey H Miner, James M Daley, Diane E Capen, Teodor G Păunescu, Hua A Jenny Lu
The glomerulus exercises its filtration barrier function by establishing a complex filtration apparatus consisting of podocyte foot processes, glomerular basement membrane and endothelial cells. Disruption of any component of the glomerular filtration barrier leads to glomerular dysfunction, frequently manifested as proteinuria. Ultrastructural studies of the glomerulus by transmission electron microscopy (TEM) and conventional scanning electron microscopy (SEM) have been routinely used to identify and classify various glomerular diseases...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28902935/perconditioning-combined-with-postconditioning-on-kidney-ischemia-and-reperfusion
#20
Felipe Lobato da Silva Costa, Vitor Nagai Yamaki, Renan Kleber Costa Teixeira, Daniel Haber Feijó, André Lopes Valente, Luan Teles Ferreira de Carvalho, Edson Yuzur Yasojima, Marcus Vinicius Henriques Brito
Purpose: To evaluate if combination of perconditioning and postconditioning provides improved renal protection compared to perconditioning alone in a model of renal reperfusion injury. Methods: Thirty rats were assigned into 6 groups: normality; sham; ischemia and reperfusion; postconditioning; perconditioning; perconditioning + postconditioning. Animals were subjected to right nephrectomy and left renal ischemia for 30 minutes. Postconditioning consisted of 3 cycles of 5 min renal perfusion followed by 5 min of renal ischemia after major ischemic period...
August 2017: Acta Cirúrgica Brasileira
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