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https://www.readbyqxmd.com/read/28218266/crystal-nephropathies-mechanisms-of-crystal-induced-kidney-injury
#1
REVIEW
Shrikant R Mulay, Hans-Joachim Anders
Crystals can trigger a wide range of kidney injuries that can lead to acute kidney injury, chronic kidney disease, renal colic or nephrocalcinosis, depending on the localization and dynamics of crystal deposition. Studies of the biology of crystal handling by the kidney have shown that the formation of different crystals and other microparticles and the associated mechanisms of renal damage share molecular mechanisms, such as stimulation of the NLRP3 inflammasome or direct cytotoxicity through activation of the necroptosis signalling pathway...
February 20, 2017: Nature Reviews. Nephrology
https://www.readbyqxmd.com/read/28211006/surgical-margins-in-nephron-sparing-surgery-for-renal-cell-carcinoma
#2
REVIEW
Dean D Laganosky, Christopher P Filson, Viraj A Master
The oncologic impact of positive surgical margins after nephron-sparing surgery is controversial. Herein, we discuss current data surrounding surgical margins in the operative management of renal cell carcinoma. The prevalence, risk factors, outcomes, and subsequent management of positive surgical margins will be reviewed. Literature suggests that the prevalence of positive surgical margins following kidney surgery varies by practice setting, tumor characteristics, and operation type. For patients undergoing nephron-sparing surgery, it is not necessary to remove a margin of healthy tissue...
January 2017: Current Urology Reports
https://www.readbyqxmd.com/read/28208659/developmental-origins-of-chronic-kidney-disease-should-we-focus-on-early-life
#3
REVIEW
You-Lin Tain, Chien-Ning Hsu
Chronic kidney disease (CKD) is becoming a global burden, despite recent advances in management. CKD can begin in early life by so-called "developmental programming" or "developmental origins of health and disease" (DOHaD). Early-life insults cause structural and functional changes in the developing kidney, which is called renal programming. Epidemiological and experimental evidence supports the proposition that early-life adverse events lead to renal programming and make subjects vulnerable to developing CKD and its comorbidities in later life...
February 11, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28203565/tubular-dysfunction-mimicking-dent-s-disease-in-2-infants-born-with-extremely-low-birth-weight
#4
Midori Awazu, Mie Arai, Shoko Ohashi, Hirotaka Takahashi, Takashi Sekine, Kazushige Ikeda
Two preterm infants, with extremely low birth weight born at gestational weeks 24 and 25, showed generalized proximal tubular dysfunction during their stay in the neonatal intensive care unit, including glucosuria, low molecular weight proteinuria, phosphaturia, uricosuria, enzymuria (elevated urine N-acetyl-β-D-glucosaminidase), panaminoaciduria, and hypercalciuria, associated with renal calcification. Renal tubular acidosis was not present in either patient. DNA mutation analysis for Dent's disease, performed in patient 1, was negative...
January 2017: Case Reports in Nephrology and Dialysis
https://www.readbyqxmd.com/read/28202497/deficiency-of-the-angiotensinase-aminopeptidase-a-increases-susceptibility-to-glomerular-injury
#5
Juan Carlos Q Velez, Ehtesham Arif, Jessalyn Rodgers, Megan P Hicks, John M Arthur, Deepak Nihalani, Evelyn T Bruner, Milos N Budisavljevic, Carl Atkinson, Wayne R Fitzgibbon, Michael G Janech
Aminopeptidase A (APA) is expressed in glomerular podocytes and tubular epithelia and metabolizes angiotensin II (AngII), a peptide known to promote glomerulosclerosis. In this study, we tested whether APA expression changes in response to progressive nephron loss or whether APA exerts a protective role against glomerular damage and during AngII-mediated hypertensive kidney injury. At advanced stages of FSGS, fawn-hooded hypertensive rat kidneys exhibited distinctly increased APA staining in areas of intact glomerular capillary loops...
February 15, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28202171/residual-renal-function-a-paradigm-shift
#6
Jerome Lowenstein, Jared J Grantham
Residual renal function (RRF) in patients undergoing dialysis treatments is currently viewed as glomerular filtrate that has escaped tubular reabsorption. RRF has been quantified as a clearance of urea or creatinine, or urea + creatinine. A major paradigm shift has followed the recognition that a substantial number of organic anion retention solutes (possible "uremic toxins") are protein-bound and therefore are not readily filtered. These protein-bound aryl compounds are secreted by renal tubular organic anion transporters (OATs)...
March 2017: Kidney International
https://www.readbyqxmd.com/read/28191781/direct-isolation-and-characterization-of-human-nephron-progenitors
#7
Stefano Da Sacco, Matthew E Thornton, Astgik Petrosyan, Maria Lavarreda-Pearce, Sargis Sedrakyan, Brendan H Grubbs, Roger E De Filippo, Laura Perin
Mature nephrons originate from a small population of uninduced nephrogenic progenitor cells (NPs) within the cap mesenchyme. These cells are characterized by the coexpression of SIX2 and CITED1. Many studies on mouse models as well as on human pluripotent stem cells have advanced our knowledge of NPs, but very little is known about this population in humans, since it is exhausted before birth and strategies for its direct isolation are still limited. Here we report an efficient protocol for direct isolation of human NPs without genetic manipulation or stepwise induction procedures...
February 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28187982/the-renal-trpv4-channel-is-essential-for-adaptation-to-increased-dietary-potassium
#8
Mykola V Mamenko, Nabila Boukelmoune, Viktor N Tomilin, Oleg L Zaika, V Behrana Jensen, Roger G O'Neil, Oleh M Pochynyuk
To maintain potassium homeostasis, kidneys exert flow-dependent potassium secretion to facilitate kaliuresis in response to elevated dietary potassium intake. This process involves stimulation of calcium-activated large conductance maxi-K (BK) channels in the distal nephron, namely the connecting tubule and the collecting duct. Recent evidence suggests that the TRPV4 channel is a critical determinant of flow-dependent intracellular calcium elevations in these segments of the renal tubule. Here, we demonstrate that elevated dietary potassium intake (five percent potassium) increases renal TRPV4 mRNA and protein levels in an aldosterone-dependent manner and causes redistribution of the channel to the apical plasma membrane in native collecting duct cells...
February 7, 2017: Kidney International
https://www.readbyqxmd.com/read/28185787/progression-of-renal-fibrosis-in-congenital-ckd-model-rats-with-reduced-number-of-nephrons
#9
Hidenori Yasuda, Yuki Tochigi, Kentaro Katayama, Hiroetsu Suzuki
A congenital reduction in the number of nephrons is a critical risk factor for both onset of chronic kidney disease (CKD) and its progression to end-stage kidney disease (ESKD). Hypoplastic kidney (HPK) rats have only about 20% of the normal number of nephrons and show progressive CKD. This study used an immunohistological method to assess glomerular and interstitial pathogenesis in male HPK rats aged 35-210days. CD68 positive-macrophages were found to infiltrate into glomeruli in HPK rats aged 35 and 70days and to infiltrate into interstitial tissue in rats aged 140 and 210days...
February 6, 2017: Experimental and Toxicologic Pathology: Official Journal of the Gesellschaft Für Toxikologische Pathologie
https://www.readbyqxmd.com/read/28179596/nephron-wilms-tumor-1-wt1-and-synaptopodin-expression-in-developing-podocytes-of-mice
#10
Takashi Kato, Shinya Mizuno
Newborn mouse glomeruli are still immature with a morphological feature of an early capillary loop stage, but infant mice do not manifest proteinuria. Little is known about the molecular mechanism whereby infant mice are resistant to proteinuria. Nephrin and synaptopodin are crucial for slit diaphragm and foot process (FP) formation for avoiding proteinuria. Nephrin tyrosine phosphorylation means a transient biological signaling required for FP repair or extension during nephrotic disease. Using an immunohistochemical technique, we examined the natural course of nephrin, Wilms' tumor-1 (WT1) and synaptopodin at 16...
February 7, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28179256/zebrafish-mesonephric-renin-cells-are-functionally-conserved-and-comprise-of-two-distinct-morphological-populations
#11
Sebastien A Rider, Helen C Christian, Linda J Mullins, Amelia R Howarth, Calum A MacRae, John J Mullins
Zebrafish provide an excellent model in which to assess the role of the renin-angiotensin system in renal development, injury and repair. In contrast to mammals, zebrafish kidney organogenesis terminates with the mesonephros. Despite this, the basic functional structure of the nephron is conserved across vertebrates. The relevance of teleosts for studies relating to the regulation of the renin-angiotensin system was established by assessing the phenotype and functional regulation of renin-expressing cells in zebrafish...
February 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28179254/a-mathematical-model-of-the-rat-kidney-k-induced-natriuresis
#12
Alan M Weinstein
A model of the rat nephron (Am. J. Physiol. 308:F1098, 2015) has been extended with addition of medullary vasculature. Blood vessels contain solutes from the nephron model, plus additional species from the model of Atherton et al. (Am. J. Physiol. 247:F61, 1984), representing hemoglobin buffering. In contrast to prior models of the urine concentrating mechanism, reflection coefficients for DVR are near zero. Model unknowns are initial proximal tubule pressures and flows, connecting tubule pressure, and medullary interstitial pressures and concentrations...
February 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28174247/self-organisation-after-embryonic-kidney-dissociation-is-driven-via-selective-adhesion-of-ureteric-epithelial-cells
#13
J G Lefevre, H S Chiu, A N Combes, J M Vanslambrouck, A Ju, N A Hamilton, M H Little
Human pluripotent stem cells, after directed differentiation in vitro, can spontaneously generate complex tissues via self-organisation of the component cells. Self-organisation can also reform embryonic organ structure after tissue disruption. It has previously been demonstrated that dissociated embryonic kidneys can recreate component epithelial and mesenchymal relationships sufficient to allow continued kidney morphogenesis. Here we investigate the timing and underlying mechanisms driving self-organisation after dissociation of the embryonic kidney using time-lapse imaging, high-resolution confocal analyses and mathematical modelling...
February 7, 2017: Development
https://www.readbyqxmd.com/read/28168444/fluid-shear-stress-induced-tgf-%C3%AE-alk5-signaling-in-renal-epithelial-cells-is-modulated-by-mek1-2
#14
Steven J Kunnen, Wouter N Leonhard, Cor Semeins, Lukas J A C Hawinkels, Christian Poelma, Peter Ten Dijke, Astrid Bakker, Beerend P Hierck, Dorien J M Peters
Renal tubular epithelial cells are exposed to mechanical forces due to fluid flow shear stress within the lumen of the nephron. These cells respond by activation of mechano-sensors located at the plasma membrane or the primary cilium, having crucial roles in maintenance of cellular homeostasis and signaling. In this paper, we applied fluid shear stress to study TGF-β signaling in renal epithelial cells with and without expression of the Pkd1-gene, encoding a mechano-sensor mutated in polycystic kidney disease...
February 6, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28164134/diabetes-induced-reactive-oxygen-species-mechanism-of-their-generation-and-role-in-renal-injury
#15
REVIEW
Selim Fakhruddin, Wael Alanazi, Keith E Jackson
Diabetes induces the onset and progression of renal injury through causing hemodynamic dysregulation along with abnormal morphological and functional nephron changes. The most important event that precedes renal injury is an increase in permeability of plasma proteins such as albumin through a damaged glomerular filtration barrier resulting in excessive urinary albumin excretion (UAE). Moreover, once enhanced UAE begins, it may advance renal injury from progression of abnormal renal hemodynamics, increased glomerular basement membrane (GBM) thickness, mesangial expansion, extracellular matrix accumulation, and glomerulosclerosis to eventual end-stage renal damage...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28162133/restricted-nutrition-induced-low-birth-weight-low-number-of-nephrons-and-glomerular-mesangium-injury-in-japanese-quail
#16
H Nishimura, E Yaoita, M Nameta, K Yamaguchi, M Sato, C Ihoriya, L Zhao, H Kawachi, T Sasaki, Y Ikezumi, Y Ouchi, N Kashihara, T Yamamoto
Insufficient nutrition during the perinatal period causes structural alterations in humans and experimental animals, leading to increased vulnerability to diseases in later life. Japanese quail, Coturnix japonica, in which partial (8-10%) egg white was withdrawn (EwW) from eggs before incubation had lower birth weights than controls (CTs). EwW birds also had reduced hatching rates, smaller glomeruli and lower embryo weight. In EwW embryos, the surface condensate area containing mesenchymal cells was larger, suggesting that delayed but active nephrogenesis takes place...
February 6, 2017: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/28161843/validation-of-3d-volumetric-based-renal-function-prediction-calculator-for-nephron-sparing-surgery
#17
Renato Corradi, Aashish Kabra, Melissa Suarez, Jacob Oppenheimer, Zhamshid Okhunov, Hugh White, Stephanie Nougaret, Hebert A Vargas, Jaime Landman, Jonathan Coleman, Michael A Liss
OBJECTIVE: To evaluate a recently published volume-based renal function prediction calculator intended to be used in small renal mass surgical counseling. METHODS: Retrospective data collection included three-dimensional calculation of renal mass and parenchyma of patients who have undergone extirpative therapy. The predicted glomerular filtration rate (GFR) was calculated using the online calculator. The predicted GFR was compared with the actual 6-month GFR. The Pearson correlation coefficient, paired t test and root-mean-square error (RMSE) are utilized for statistical analysis...
February 4, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/28161315/renal-development-in-the-fetus-and-premature-infant
#18
REVIEW
Stacy Rosenblum, Abhijeet Pal, Kimberly Reidy
Congenital abnormalities of the kidney and urinary tract (CAKUT) are one of the leading congenital defects to be identified on prenatal ultrasound. CAKUT represent a broad spectrum of abnormalities, from transient hydronephrosis to severe bilateral renal agenesis. CAKUT are a major contributor to chronic and end stage kidney disease (CKD/ESKD) in children. Prenatal imaging is useful to identify CAKUT, but will not detect all defects. Both genetic abnormalities and the fetal environment contribute to CAKUT. Monogenic gene mutations identified in human CAKUT have advanced our understanding of molecular mechanisms of renal development...
February 1, 2017: Seminars in Fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28160049/prolylcarboxypeptidase-deficiency-is-associated-with-increased-blood-pressure-glomerular-lesions-and-cardiac-dysfunction-independent-of-altered-circulating-and-cardiac-angiotensin-ii
#19
Christoph Maier, Ines Schadock, Philipp K Haber, Jan Wysocki, Minghao Ye, Yashpal Kanwar, Christopher A Flask, Xin Yu, Brian D Hoit, Gregory N Adams, Alvin H Schmaier, Michael Bader, Daniel Batlle
: Prolylcarboxypeptidase (PRCP) is a carboxypeptidase that cleaves angiotensin II (AngII) forming Ang(1-7). The impact of genetic PRCP deficiency on AngII metabolism, blood pressure (BP), kidney histology, and cardiac phenotype was investigated in two lines of PRCP-deficient mice: KST302 derived in C57BL/6 background and GST090 derived in FVB/N background. The GST090 line had increased mean arterial pressure (MAP) (113.7 ± 2.07 vs. WT 105.0 ± 1.23 mmHg; p < 0.01) and left ventricular hypertrophy (LVH) (ratio of diastolic left ventricular posterior wall dimension to left ventricular diameter 0...
February 3, 2017: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/28154200/pals1-haploinsufficiency-results-in-proteinuria-and-cyst-formation
#20
Thomas Weide, Beate Vollenbröker, Ulf Schulze, Ivona Djuric, Maria Edeling, Jakob Bonse, Florian Hochapfel, Olga Panichkina, Dirk-Oliver Wennmann, Britta George, Seonhee Kim, Christoph Daniel, Jochen Seggewiß, Kerstin Amann, Wilhelm Kriz, Michael P Krahn, Hermann Pavenstädt
The nephron is the basic physiologic subunit of the mammalian kidney and is made up of several apicobasally polarized epithelial cell types. The process of apicobasal polarization in animal cells is controlled by the evolutionarily conserved Crumbs (CRB), Partitioning-defective, and Scribble protein complexes. Here, we investigated the role of protein associated with LIN-7 1 (Pals1, also known as Mpp5), a core component of the apical membrane-determining CRB complex in the nephron. Pals1 interacting proteins, including Crb3 and Wwtr1/Taz, have been linked to renal cyst formation in mice before...
February 2, 2017: Journal of the American Society of Nephrology: JASN
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