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https://www.readbyqxmd.com/read/29341864/comparison-of-acute-kidney-injury-of-different-aetiology-reveals-in-common-mechanisms-of-tissue-damage
#1
Michael Hultström, Mediha Becirovic-Agic, Sofia Jönsson
Acute kidney injury (AKI) is a syndrome of reduced glomerular filtration rate (GFR) and urine production caused by a number of different diseases. It is associated with renal tissue damage. This tissue damage can cause tubular atrophy and interstitial fibrosis that leads to nephron loss and progression of chronic kidney disease (CKD). This review describes the in-common mechanisms behind tissue damage in AKI caused by different underlying diseases. Comparing six high-quality microarray studies of renal gene expression after AKI in disease models (gram-negative sepsis, gram-positive sepsis, ischemia-reperfusion, malignant hypertension, rhabdomyolysis and cisplatin toxicity) identified 5254 differentially expressed genes in at least one of the AKI models...
December 20, 2017: Physiological Genomics
https://www.readbyqxmd.com/read/29339655/the-impact-of-arterial-clamping-technique-in-robot-assisted-partial-nephrectomy-on-renal-function-and-surgical-outcomes-six-year-experience-at-siriraj-hospital-thailand
#2
Tawatchai Taweemonkongsap, Chalairat Suk-Ouichai, Ekkarin Chotikawanich, Siros Jitpraphai, Varat Woranisarakul, Patkawat Ramart, Kittipong Phinthusophon, Teerapon Amornvesukit, Sunai Leewansangtong, Sittiporn Srinualnad, Chaiyong Nualyong
INTRODUCTION: Robot-assisted partial nephrectomy (RAPN) with different arterial clamping techniques has increasingly been performed to avoid ischemic injury to nephron. However, postoperative renal function remains controversial. We determine the impact of each renal arterial clamping on surgical and renal outcomes after RAPN. MATERIALS AND METHODS: Patients who underwent RAPN at Siriraj Hospital from 2010 to 2016 were retrospectively reviewed and stratified into 3 cohorts: main-clamp (MAC), selective-clamp, and off-clamp...
January 16, 2018: Urologia Internationalis
https://www.readbyqxmd.com/read/29335243/nephronectin-regulates-mesangial-cell-adhesion-and-behavior-in-glomeruli
#3
Susan E Zimmerman, Chitkale Hiremath, Jun Tsunezumi, Zhufeng Yang, Bronwyn Finney, Denise K Marciano
A critical aspect of kidney function occurs at the glomerulus, the capillary network that filters the blood. The glomerular basement membrane (GBM) is a key component of filtration, yet our understanding of GBM interactions with mesangial cells, specialized pericytes that provide structural stability to glomeruli, is limited. We investigated the role of nephronectin (Npnt), a GBM component and known ligand of α8β1 integrin. Immunolocalization and in situ hybridization studies in kidneys of adult mice revealed that nephronectin is produced by podocytes and deposited into the GBM...
January 15, 2018: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/29329932/development-of-the-human-fetal-kidney-from-mid-to-late-gestation-in-male-and-female-infants
#4
Danica Ryan, Megan R Sutherland, Tracey J Flores, Alison L Kent, Jane E Dahlstrom, Victor G Puelles, John F Bertram, Andrew P McMahon, Melissa H Little, Lynette Moore, Mary Jane Black
BACKGROUND: During normal human kidney development, nephrogenesis (the formation of nephrons) is complete by term birth, with the majority of nephrons formed late in gestation. The aim of this study was to morphologically examine nephrogenesis in fetal human kidneys from 20 to 41weeks of gestation. METHODS: Kidney samples were obtained at autopsy from 71 infants that died acutely in utero or within 24h after birth. Using image analysis, nephrogenic zone width, the number of glomerular generations, renal corpuscle cross-sectional area and the cellular composition of glomeruli were examined...
December 20, 2017: EBioMedicine
https://www.readbyqxmd.com/read/29317010/a-new-model-for-fetal-programming-maternal-ramadan-type-fasting-programs-nephrogenesis
#5
M Mohany, N Ashton, A H Harrath, J R Nyengaard, S Y Alomar, S Alwasel
The effect of maternal Ramadan-type fasting (RTF) on the outcome of pregnancy, kidney development and nephron number in male rat offspring was investigated in current study. Pregnant rats were given food and water ad libitum during pregnancy (control) or restricted for 16 h per day (RTF). Kidney structure was examined during fetal life, at birth, and in early and late adulthood. Maternal body weight, food intake, relative food intake and plasma glucose levels were significantly lower (P<0.001) in the RTF group...
January 10, 2018: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/29288189/the-renal-parenchyma-evaluation-of-a-novel-ultrasound-measurement-to-assess-fetal-renal-development-protocol-for-an-observational-longitudinal-study
#6
Sonja Brennan, Michal Schneider, David Watson, Yogavijayan Kandasamy, Donna Rudd
INTRODUCTION: Disorders of fetal growth, such as intrauterine growth restriction (IUGR) and large for gestational age (LGA), have been found to have a profound effect on the development of the fetal kidney. Abnormal kidney development is associated with hypertension and chronic kidney disease later in life. This study will use a novel ultrasound measurement to assess the renal parenchymal growth and kidney arterial blood flow in the fetus to evaluate the development of the fetal kidneys and provide an indirect estimate of nephron number...
December 28, 2017: BMJ Open
https://www.readbyqxmd.com/read/29281864/long-term-effects-of-neonatal-hyperoxia-in-adult-mice
#7
Vasantha Hs Kumar, Huamei Wang, Sergei Kishkurno, Babu S Paturi, Lori Nielsen, Rita M Ryan
BACKGROUND: The outcomes of premature infants have improved greatly, however the health risks in adulthood are still relatively unclear. Bronchopulmonary dysplasia (BPD) in premature infants is a major risk factor producing alteration in lung function and predisposition to later respiratory morbidity, and is associated with hyperoxia. This study explores the effect of neonatal hyperoxia on organ systems in adult mice. METHODS: Newborn mouse litters were randomized to 85%O2 or room air (RA) on P3 for 12 days; mice were sacrificed at P3, P7, P15, 3 months and 9 months...
December 27, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29273971/stereological-study-of-developing-glomerular-forms-during-human-fetal-kidney-development
#8
Marija Dakovic Bjelakovic, Slobodan Vlajkovic, Aleksandar Petrovic, Marko Bjelakovic, Milorad Antic
BACKGROUND: Human fetal kidney development is a complex and stepwise process. The number, shape, size and distribution of glomeruli provide important information on kidney organization. The aim of this study was to quantify glomerular developing forms during human fetal kidney development using stereological methods. METHODS: Kidney tissue specimens of 40 human fetuses with gestational ages ranging from 9 to 40 weeks were analyzed. Specimens were divided into eight groups based on gestational age, each corresponding to 1 lunar month...
December 23, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/29240767/mitf-a-controls-branching-morphogenesis-and-nephron-endowment
#9
Aurélie Phelep, Denise Laouari, Kapil Bharti, Martine Burtin, Salvina Tammaccaro, Serge Garbay, Clément Nguyen, Florence Vasseur, Thomas Blanc, Sophie Berissi, Francina Langa-Vives, Evelyne Fischer, Anne Druilhe, Heinz Arnheiter, Gerard Friedlander, Marco Pontoglio, Fabiola Terzi
Congenital nephron number varies widely in the human population and individuals with low nephron number are at risk of developing hypertension and chronic kidney disease. The development of the kidney occurs via an orchestrated morphogenetic process where metanephric mesenchyme and ureteric bud reciprocally interact to induce nephron formation. The genetic networks that modulate the extent of this process and set the final nephron number are mostly unknown. Here, we identified a specific isoform of MITF (MITF-A), a bHLH-Zip transcription factor, as a novel regulator of the final nephron number...
December 14, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/29237753/troy-tnfrsf19-marks-epithelial-progenitor-cells-during-mouse-kidney-development-that-continue-to-contribute-to-turnover-in-adult-kidney
#10
Frans Schutgens, Maarten B Rookmaaker, Francis Blokzijl, Ruben van Boxtel, Robert Vries, Edwin Cuppen, Marianne C Verhaar, Hans Clevers
During kidney development, progressively committed progenitor cells give rise to the distinct segments of the nephron, the functional unit of the kidney. Similar segment-committed progenitor cells are thought to be involved in the homeostasis of adult kidney. However, markers for most segment-committed progenitor cells remain to be identified. Here, we evaluate Troy/TNFRSF19 as a segment-committed nephron progenitor cell marker. Troy is expressed in the ureteric bud during embryonic development. During postnatal nephrogenesis, Troy+ cells are present in the cortex and papilla and display an immature tubular phenotype...
December 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29217079/haploinsufficiency-for-the-six2-gene-increases-nephron-progenitor-proliferation-promoting-branching-and-nephron-number
#11
Alexander N Combes, Sean Wilson, Belinda Phipson, Brandon B Binnie, Adler Ju, Kynan T Lawlor, Cristina Cebrian, Sarah L Walton, Ian M Smyth, Karen M Moritz, Raphael Kopan, Alicia Oshlack, Melissa H Little
The regulation of final nephron number in the kidney is poorly understood. Cessation of nephron formation occurs when the self-renewing nephron progenitor population commits to differentiation. Transcription factors within this progenitor population, such as SIX2, are assumed to control expression of genes promoting self-renewal such that homozygous Six2 deletion results in premature commitment and an early halt to kidney development. In contrast, Six2 heterozygotes were assumed to be unaffected. Using quantitative morphometry, we found a paradoxical 18% increase in ureteric branching and final nephron number in Six2 heterozygotes, despite evidence for reduced levels of SIX2 protein and transcript...
December 4, 2017: Kidney International
https://www.readbyqxmd.com/read/29196442/nephron-progenitor-cell-death-elicits-a-limited-compensatory-response-associated-with-interstitial-expansion-in-the-neonatal-kidney
#12
Sree Deepthi Muthukrishnan, Sergey Ryzhov, Michele Karolak, Leif Oxburgh
The final nephron number in an adult kidney is regulated by nephron progenitor cell availability and collecting duct branching in the fetal period. Fetal environmental perturbations that cause reductions in cell numbers in these two compartments result in low nephron endowment. Previous work has shown that maternal dietary factors influence nephron progenitor cell availability, with both caloric restriction and protein deprivation leading to reduced cell numbers through apoptosis. In this study, we evaluate the consequences of inducing nephron progenitor cell death on progenitor niche dynamics and on nephron endowment...
December 1, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29168475/chronic-kidney-disease
#13
REVIEW
Paola Romagnani, Giuseppe Remuzzi, Richard Glassock, Adeera Levin, Kitty J Jager, Marcello Tonelli, Ziad Massy, Christoph Wanner, Hans-Joachim Anders
Chronic kidney disease (CKD) is defined by persistent urine abnormalities, structural abnormalities or impaired excretory renal function suggestive of a loss of functional nephrons. The majority of patients with CKD are at risk of accelerated cardiovascular disease and death. For those who progress to end-stage renal disease, the limited accessibility to renal replacement therapy is a problem in many parts of the world. Risk factors for the development and progression of CKD include low nephron number at birth, nephron loss due to increasing age and acute or chronic kidney injuries caused by toxic exposures or diseases (for example, obesity and type 2 diabetes mellitus)...
November 23, 2017: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/29166383/prematurity-disrupts-glomeruli-development-while-prematurity-and-hyperglycemia-lead-to-altered-nephron-maturation-and-increased-oxidative-stress-in-newborn-baboons
#14
Danielle A Callaway, Lisa L McGill-Vargas, Amy Quinn, Jasmine L Jordan, Lauryn A Winter, Diana Anzueto, Edward J Dick, Cynthia L Blanco
BACKGROUND: Premature birth occurs when nephrogenesis is incomplete and has been linked to increased renal pathologies in the adult. Metabolic factors complicating preterm birth may have additional consequences for kidney development. Here, we evaluated the effects of prematurity and hyperglycemia on nephrogenesis in premature baboons when compared to term animals. METHODS: Baboons were delivered prematurely (67% gestation; n=9) or at term (n=7) and survived 2-4 weeks...
November 22, 2017: Pediatric Research
https://www.readbyqxmd.com/read/29142961/the-renal-pathology-of-obesity
#15
REVIEW
Nobuo Tsuboi, Yusuke Okabayashi, Akira Shimizu, Takashi Yokoo
Obesity causes various structural, hemodynamic, and metabolic alterations in the kidney. Most of these are likely to be compensatory responses to the systemic increase in metabolic demand that is seen with obesity. In some cases, however, renal injury becomes clinically apparent as a result of compensatory failure. Obesity-related glomerulopathy is the best known of such disease states. Factors that may sensitize obese individuals to renal compensatory failure and associated injury include the severity and number of obesity-associated conditions or complications, including components of metabolic syndrome, and the mismatch of body size to nephron mass, due to nephron reductions of congenital or acquired origin...
March 2017: KI Reports
https://www.readbyqxmd.com/read/29120031/histopathological-immunohistochemical-and-stereological-analysis-of-the-effect-of-gingko-biloba-egb761-on-the-hippocampus-of-rats-exposed-to-long-term-cellphone-radiation
#16
Fikret Gevrek
Cellular phones are major sources of electromagnetic radiation (EMR) that can penetrate the human body and pose serious health hazards. The increasingly widespread use of mobile communication systems has raised concerns about the effects of cellphone radiofrequency (RF) on the hippocampus because of its close proximity to radiation during cellphone use. The effects of cellphone EMR exposure on the hippocampus of rats and the possible counteractive effects of ginkgo biloba (Egb761) were aimed to investigate...
November 9, 2017: Histology and Histopathology
https://www.readbyqxmd.com/read/29103408/effects-of-bisphenol-a-treatment-during-pregnancy-on-kidney-development-in-mice-a-stereological-and-histopathological-study
#17
P Nuñez, T Fernandez, M García-Arévalo, P Alonso-Magdalena, A Nadal, C Perillan, J Arguelles
Bisphenol A (BPA) is a chemical found in plastics that resembles oestrogen in organisms. Developmental exposure to endocrine-disrupting chemicals, such as BPA, increases the susceptibility to type 2 diabetes (T2DM) and cardiovascular diseases. Animal studies have reported a nephron deficit in offspring exposed to maternal diabetes. The aim of this study was to investigate the prenatal BPA exposure effects on nephrogenesis in a mouse model that was predisposed to T2DM. This study quantitatively evaluated the renal structural changes using stereology and histomorphometry methods...
November 6, 2017: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/29092847/measuring-rat-kidney-glomerular-number-and-size-in-vivo-with-mri
#18
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/29043688/-correlation-between-prenatal-ultrasound-and-postnatal-diagnosis-of-birth-defects
#19
F J Murcia Pascual, L Delgado Cotán, V Jiménez Crespo, F Vázquez Rueda, E Rodríguez Cano, M Miño Mora, R M Paredes Esteban
OBJECTIVES: To assess the accuracy of prenatal ultrasound diagnosis and to analyze the protocol applied for congenital defects (CD) in our environment. METHODS: Descriptive study of prenatally diagnosed CD in our area between 2004-2013. Includes: total births, fetal medicine referrals (number of consultations, ultrasound, invasive techniques) anatomical and chromosomal abnormalities, confirmed diagnoses, necropsies performed, false diagnoses, absence of prenatal diagnoses, and number and reasons for abortions (VIEs)...
July 20, 2017: Cirugía Pediátrica: Organo Oficial de la Sociedad Española de Cirugía Pediátrica
https://www.readbyqxmd.com/read/28978800/new-insights-on-glomerular-hyperfiltration-a-japanese-autopsy-study
#20
Go Kanzaki, Victor G Puelles, Luise A Cullen-McEwen, Wendy E Hoy, Yusuke Okabayashi, Nobuo Tsuboi, Akira Shimizu, Kate M Denton, Michael D Hughson, Takashi Yokoo, John F Bertram
It has been suggested that low nephron number contributes to glomerular hypertension and hyperperfusion injury in progressive chronic kidney disease (CKD). The incidence of CKD in Japan is among the highest in the world, but the reasons remain unclear. We estimated total nephron (glomerular) number (NglomTOTAL) as well as numbers of nonsclerosed (NglomNSG) and globally sclerosed glomeruli (NglomGSG), and the mean volume of nonsclerosed glomeruli (VglomNSG) in Japanese normotensive, hypertensive, and CKD subjects and investigated associations between these parameters and estimated glomerular filtration rate (eGFR)...
October 5, 2017: JCI Insight
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