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Collecting duct

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https://www.readbyqxmd.com/read/28636485/mineralocorticoids-modulate-the-expression-of-the-beta-3-subunit-of-the-na-k-atpase-in-the-renal-collecting-duct
#1
Macarena Rojas, Pablo Díaz, Pablo León, Alexis A González, Magdalena González, Víctor Barrientos, Nikolay B Pestov, Rodrigo Alzamora, Luis Michea
Renal sodium reabsorption depends on the activity of the Na(+),K(+)-ATPase α/β heterodimer. Four α (α1-4) and three β (β1-3) subunit isoforms have been described. It is accepted that renal tubule cells express α1/β1 dimers. Aldosterone stimulates Na(+),K(+)-ATPase activity and may modulate α1/β1 expression. However, some studies suggest the presence of β3 in the kidney. We hypothesized that the β3 isoform of the Na(+),K(+)-ATPase is expressed in tubular cells of the distal nephron, and modulated by mineralocorticoids...
June 21, 2017: Channels
https://www.readbyqxmd.com/read/28633941/pancreatic-cyst-fluid-vascular-endothelial-growth-factor-a-and-carcinoembryonic-antigen-a-highly-accurate-test-for-the-diagnosis-of-serous-cystic-neoplasm
#2
Rosalie A Carr, Michele T Yip-Schneider, Scott Dolejs, Bradley A Hancock, Huangbing Wu, Milan Radovich, C Max Schmidt
BACKGROUND: Accurate differentiation of pancreatic cystic lesions is important for pancreatic cancer early detection and prevention as well as avoidance of unnecessary surgical intervention. Serous cystic neoplasms (SCN) have no malignant potential, but may mimic premalignant mucinous cystic lesions: mucinous cystic neoplasm (MCN) and intraductal papillary mucinous neoplasm (IPMN). We recently identified vascular endothelial growth factor (VEGF)-A as a novel pancreatic fluid biomarker for SCN...
May 18, 2017: Journal of the American College of Surgeons
https://www.readbyqxmd.com/read/28629763/delayed-referral-to-specialist-centre-increases-morbidity-in-patients-with-bile-duct-injury-bdi-after-laparoscopic-cholecystectomy-lc
#3
S Martinez-Lopez, V Upasani, S Pandanaboyana, M Attia, G Toogood, P Lodge, E Hidalgo
BACKGROUND: There is still a debate regarding the optimal management of bile duct injury following cholecystectomy. Our aim was to ascertain if delayed referral influenced clinical outcomes for patients with BDI treated in our institution. MATERIALS AND METHODS: We interrogated a prospectively maintained database, including all patients with BDI (Bismuth and Strasberg classifications) post LC managed in our unit from 2000-2014. Referrals were arbitrarily defined as early (<96 hours from the injury) and delayed (>96 hours)...
June 16, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28629565/a-tri-exponential-model-for-intravoxel-incoherent-motion-analysis-of-the-human-kidney-in-silico-and-during-pharmacological-renal-perfusion-modulation
#4
René van der Bel, Oliver J Gurney-Champion, Martijn Froeling, Erik S G Stroes, Aart J Nederveen, C T Paul Krediet
In the kidneys, there is both blood flow through the capillaries and flow of pre-urine through the tubuli and collecting ducts. We hypothesized that diffusion-weighted (DW) MRI measures both blood and pre-urine flow when using a tri-exponential intravoxel incoherent motion (IVIM) model. Our aim was to systematically investigate and optimize tri-exponential IVIM-analysis for the kidney and test its sensitivity to renal perfusion changes in humans. The tri-exponential fit probes the diffusion coefficient (D), the intermediate (D*i) and fast (D*f) pseudo-diffusion coefficients, and their signal fractions, fD, fi and ff...
June 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28627210/lactobacillus-rhamnosusgg-reduces-hepatic-fibrosis-in-a-model-of-chronic-liver-disease-in-rats
#5
Thais Ortiz Hammes, Renata Leke, Thayssa Dalla Costa Escobar, Laisa Beduschi Fracasso, Fabiola Schons Meyer, Michael Éverton Andrades, Themis Reverbel da Silveira
BACKGROUND: The intestinal dysbiosis is common in chronic liver disease and can induce to inflammatory responses and mediate the collagen deposition in the liver. AIM: To evaluate the probiotic Lactobacillus rhamnosus GG (LGG) for the treatment of liver fibrosis in a model of chronic cholestatic liver disease in rats. METHODS: Male adult Wistar rats (n = 29) were submitted to common bile duct ligation (BDL groups) or manipulation of common bile duct without ligation (Ctrl groups)...
June 5, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/28626223/development-tfcp2l1-drives-notch-signalling-and-epithelial-diversity-in-the-collecting-duct
#6
Andrea Aguilar
No abstract text is available yet for this article.
June 19, 2017: Nature Reviews. Nephrology
https://www.readbyqxmd.com/read/28625406/ductal-stones-recurrence-after-extracorporeal-shock-wave-lithotripsy-for-difficult-common-bile-duct-stones-predictive-factors
#7
Rosangela Muratori, Daniele Mandolesi, Chiara Pierantoni, Davide Festi, Antonio Colecchia, Giuseppe Mazzella, Franco Bazzoli, Francesco Azzaroli
BACKGROUND & PURPOSE: Extra-corporeal shock wave lithotripsy (ESWL) can be considered in difficult common bile duct stones (DCBDS), with a success rate greater than 90% but data on stone recurrence after ESWL are limited. We performed a retrospective analysis to evaluate long-term outcomes in patients who underwent ESWL for DCBDS. METHODS: From May 1992 to October 2012, patients who underwent ESWL treatment for DCBDS, not amenable to endoscopic extraction, were included...
May 23, 2017: Digestive and Liver Disease
https://www.readbyqxmd.com/read/28617990/cell-specific-diversity-in-the-expression-and-organization-of-cytoplasmic-plaque-proteins-of-apical-junctions
#8
Ekaterina Vasileva, Sophie Sluysmans, Marie-Luce Bochaton-Piallat, Sandra Citi
Tight and adherens junctions play critical roles in the barrier, adhesion, and signaling functions of epithelial and endothelial cells. How the molecular organization of these junctions is tuned to the widely diverse physiological requirements of each tissue type is not well understood. Here, we address this question by examining the expression, localization, and interactions of major cytoplasmic plaque proteins of tight and adherens junctions in different cultured epithelial and endothelial cell lines. Immunoblotting and immunofluorescence analyses show that the expression profiles of cingulin, paracingulin, ZO-1, ZO-2, ZO-3, PLEKHA7, afadin, PDZD11, p120-catenin, and α-catenin, as well as the transmembrane junctional proteins occludin, E-cadherin, and VE-cadherin, are significantly diverse when comparing kidney cells (MDCK, mCCD), keratinocytes (HaCaT), lung carcinoma (A427, A549), and endothelium-derived cells (bEnd...
June 15, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28615247/lithium-induced-ndi-acetazolamide-reduces-polyuria-but-does-not-improve-urine-concentrating-ability
#9
Theun de Groot, Joan Doornebal, Birgitte M Christensen, Simone C Cockx, Anne P Sinke, Ruben Baumgarten, Jennifer J Bedford, Robert J Walker, Jack F Wetzels, Peter M T Deen
Lithium is the mainstay treatment for patients with bipolar disorder, but generally causes nephrogenic diabetes insipidus (NDI), a disorder in which the renal urine concentrating ability has become vasopressin-insensitive. Li-NDI is caused by lithium uptake by collecting duct principal cells and downregulation of AQP2 water channels, which are essential for water uptake from pro-urine. Recently, we found that the prophylactic administration of acetazolamide to mice effectively attenuated Li-NDI. To evaluate whether acetazolamide might benefit lithium-treated patients, we administered acetazolamide to mice with established Li-NDI and six patients with a lithium-induced urinary concentrating defect...
June 14, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28602526/resident-operative-experience-at-independent-academic-medical-centers-a-comparison-to-the-national-cohort
#10
Amit R T Joshi, Amber W Trickey, Benjamin T Jarman, Kara J Kallies, Robert Josloff, Jonathan M Dort, Ravi Kothuru
PURPOSE: Independent Academic Medical Centers (IAMCs) comprise one-third of U.S. general surgery training programs. It is unclear whether IAMCs offer qualitatively or quantitatively different operative experiences than the national cohort. We analyzed a large representative sample of IAMCs to compare operative volume and variety, with a focus on low-volume procedures. METHODS: Accreditation Council for Graduate Medical Education Program Case Reports from 27 IAMCs were collected and analyzed for 3 academic years (2012-2015)...
June 8, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28602064/notch-signaling-in-the-collecting-duct-regulates-renal-tubulointerstitial-fibrosis-induced-by-unilateral-ureteral-obstruction-in-mice
#11
Arum Choi, Sun Ah Nam, Wan-Young Kim, Sang Hee Park, Hyang Kim, Chul Woo Yang, Jin Kim, Yong Kyun Kim
Background/Aims: Mind bomb-1 (Mib1) encodes an E3 ubiquitin ligase, which is required for the initiation of Notch signaling. Recently, it was demonstrated that the renal collecting duct plays an important role in renal fibrosis. Here, we investigated the role of Notch signaling in renal fibrosis using conditional knockout mice with the specific ablation of Mib1 in renal collecting duct principal cells. Methods: Mib1-floxed mice (Mib1f/f) were crossed with aquaporin 2 (AQP2)-Cre mice in order to generate principal cell-specific Mib1 knockout mice (Mib1f/f :AQP2-Cre+)...
May 26, 2017: Korean Journal of Internal Medicine
https://www.readbyqxmd.com/read/28593459/impact-of-surgery-and-surveillance-in-the-management-of-branch-duct-intraductal-papillary-mucinous-neoplasms-of-the-pancreas-according-to-fukuoka-guidelines-the-bologna-experience
#12
Riccardo Casadei, Claudio Ricci, Giovanni Taffurelli, Carlo Alberto Pacilio, Marina Migliori, Francesco Minni
The objective of the study was to evaluate the Fukuoka guidelines in indicating the proper management for recognising the risk factors of malignancy. Data of patients with branch duct intraductal papillary mucinous neoplasms who underwent pancreatic resection or surveillance according to the Fukuoka risk parameters were collected in a prospective database. The clinical outcome (development of pancreatic cancer, overall and disease-specific survival) and pathological results were evaluated in all patients and in resected cases, respectively...
June 7, 2017: Updates in Surgery
https://www.readbyqxmd.com/read/28592418/growth-of-meibomian-gland-tissue-after-intraductal-meibomian-gland-probing-in-patients-with-obstructive-meibomian-gland-dysfunction
#13
Steven L Maskin, Whitney R Testa
PURPOSE: To investigate the impact of meibomian gland probing (MGP) on meibomian gland (MG) area from the upper lids of patients with obstructive meibomian gland dysfunction (o-MGD). METHODS: Retrospective study comparing pre-MGP/post-MGP non-contact infrared meibography results in patients with o-MGD, viewing signs of MG growth within total measurement field. RESULTS: Post-MGP meibography of 34 lids (19 patients, ≥4.5 to ≤12 months' follow-up) showed 41...
June 7, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28591094/non-clear-cell-renal-cell-carcinomas-biological-insights-and-therapeutic-challenges-and-opportunities
#14
Gabriel G Malouf, Richard W Joseph, Amishi Y Shah, Nizar M Tannir
The non-clear cell renal cell carcinomas (nccRCCs) are a diverse group of rare-variant renal carcinomas. Each subtype harbors a distinct cell of origin and exhibits a distinct clinical behavior and response to therapy. The advent of next-generation sequencing has drastically advanced our understanding of key genetic and epigenetic drivers in these tumors, although mechanistic studies are needed to elucidate pathogenesis. The only 2 randomized clinical trials in nccRCC included patients with diverse histologic subtypes...
May 2017: Clinical Advances in Hematology & Oncology: H&O
https://www.readbyqxmd.com/read/28578081/expectant-management-of-gallbladder-stones-after-endoscopic-removal-of-common-bile-duct-stones
#15
Anne Mattila, Johanna Mrena, Ilmo Kellokumpu
BACKGROUND: Wait-and-see policy after endoscopic sphincterotomy (ES) for common bile duct (CBD) stones in patients with concomitant gallbladder stones may lead to recurrent biliary complications. The aim of this study was to assess the short and long-term results of wait-and-see policy in patients with intact gallbladder after endoscopic clearance of CBD stones. MATERIALS AND METHODS: From January 1999 to December 2014 a total of 181 consecutive patients with intact gallbladder underwent ES for CBD stones...
May 31, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28577314/transcription-factor-tfcp2l1-patterns-cells-in-the-mouse-kidney-collecting-ducts
#16
Max Werth, Kai M Schmidt-Ott, Thomas Leete, Andong Qiu, Christian Hinze, Melanie Viltard, Neal Paragas, Carrie J Shawber, Wenqiang Yu, Peter Lee, Xia Chen, Abby Sarkar, Weiyi Mu, Alexander Rittenberg, Chyuan-Sheng Lin, Jan Kitajewski, Qais Al-Awqati, Jonathan Barasch
Although most nephron segments contain one type of epithelial cell, the collecting ducts consists of at least two: intercalated (IC) and principal (PC) cells, which regulate acid-base and salt-water homeostasis, respectively. In adult kidneys, these cells are organized in rosettes suggesting functional interactions. Genetic studies in mouse revealed that transcription factor Tfcp2l1 coordinates IC and PC development. Tfcp2l1 induces the expression of IC specific genes, including specific H(+)-ATPase subunits and Jag1...
June 3, 2017: ELife
https://www.readbyqxmd.com/read/28577072/regulation-of-renal-na-k-cl-cotransporters-by-vasopressin
#17
REVIEW
Sebastian Bachmann, Kerim Mutig
Vasopressin (AVP) induces antidiuresis, thus playing an essential role in body water and electrolyte homeostasis. Its antidiuretic effects are mediated chiefly by V2 vasopressin receptors (V2R) expressed along the distal nephron and collecting duct epithelia. NaCl reabsorption in the distal nephron, which includes the thick ascending limb (TAL) and distal convoluted tubule (DCT), largely depends on the activity of two structurally related Na-(K)-Cl cotransporters, NKCC2 in TAL and NCC in DCT. AVP-induced activation of these transporters contributes to urine concentration and renal electrolyte reabsorption...
June 2, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28573815/tape-lift-sampling-of-chemical-threat-agents
#18
Krista Brady, Becky Stilley, Maria Olds, Terry O'Neill, James Egan, Evan Durnal
Commercial-off-the-shelf (COTS) materials were evaluated as surface samplers for the Department of Homeland Security Chemical Forensics Program. The program helps evidence collectors identify trace chemical residues at incident scenes. COTS items are widely available, produced in large lots, and with strict controls. Chemical attribution signatures were collected from common surfaces. Eight tape lift candidates were considered, five were chosen based on performance and tested for analytical interferences and extraction efficiencies with 14 chemicals...
June 2, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28567449/mirizzi-syndrome-a-new-insight-provided-by-a-novel-classification
#19
Carmen Payá-Llorente, Antonio Vázquez-Tarragón, Antonio Alberola-Soler, Aleix Martínez-Pérez, Elías Martínez-López, Sandra Santarrufina-Martínez, Inmaculada Ortiz-Tarín, Ernesto Armañanzas-Villena
BACKGROUNDS/AIMS: Mirizzi syndrome (MS) is an uncommon complication of cholelithiasis. The aim of this study is to evaluate our 15-year experience in this challenging entity and to propose a new classification for this disease. METHODS: A retrospective study including patients diagnosed with Mirizzi syndrome and undergoing surgical procedures for Mirizzi syndrome between January 2000 and October 2015 was conducted. Data collected included clinical, surgical procedure, postoperative morbidity...
May 2017: Annals of Hepato-Biliary-Pancreatic Surgery
https://www.readbyqxmd.com/read/28566820/patent-ductus-arteriosus-closure-using-occlutech-%C3%A2-duct-occluder-experience-in-port-elizabeth-south-africa
#20
Lungile Pepeta, Adele Greyling, Mahlubandile Fintan Nxele, Zongezile Masonwabe Makrexeni
BACKGROUND: Percutaneous closure of patent ductus arteriosus (PDA) has become standard therapy. Experience with the Occlutech® Duct Occluder is limited. METHODS: Data regarding ductal closure using Occlutech® Duct Occluder were reviewed and prospectively collected. Demographics, hemodynamic and angiographic characteristics, complications, and outcomes were documented. RESULTS: From March 2013 to June 2016, 65 patients (43 females and 22 males) underwent percutaneous closure of the PDA using Occlutech® Duct Occluder...
May 2017: Annals of Pediatric Cardiology
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