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Collecting duct

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https://www.readbyqxmd.com/read/28230608/specialized-imaging-and-procedures-in-pediatric-pancreatology-a-north-american-society-for-pediatric-gastroenterology-hepatology-and-nutrition-clinical-report
#1
Tom K Lin, David M Troendle, Daniel B Wallihan, Bradley Barth, Victor L Fox, Douglas S Fishman, Veronique D Morinville
OBJECTIVES: An increasing number of children are being diagnosed with pancreatitis and other pancreatic abnormalities. Dissemination of the information regarding existing imaging techniques and endoscopic modalities to diagnose and manage pancreatic disorders in children is sorely needed. METHODS: We conducted a review of the medical literature on the use of the following imaging and procedural modalities in pediatric pancreatology: transabdominal ultrasonography (TUS), computed tomography (CT), magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP), endoscopic ultrasonography (EUS), and endoscopic retrograde cholangiopancreatography (ERCP)...
March 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28228402/aliskiren-increases-aquaporin-2-expression-and-attenuates-lithium-induced-nephrogenic-diabetes-insipidus
#2
Yu Lin, Tiezheng Zhang, Pinning Feng, Miaojuan Qiu, Qiaojuan Liu, Suchun Li, Peili Zheng, Yonglun Kong, Moshe Levi, Chunling Li, Weidong Wang
The direct renin inhibitor aliskiren has been shown to retain and persist in medullary collecting ducts even after treatment was discontinued, suggesting a new mechanism of action for this drug. The purpose of the present study was to investigate whether aliskiren regulates renal aquaporin expression in the collecting ducts and improves urinary concentrating defect induced by lithium in mice. The mice were either fed with normal chow or LiCl diet (40mM/kg dry food/day for 4 days and 20mM/kg dry food/day for last 3 days) for seven days...
February 22, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28221139/how-do-stones-form-is-unification-of-theories-on-stone-formation-possible
#3
Victoria Y Bird, Saeed R Khan
There are two basic pathways for formation of calcium based kidney stones. Most idiopathic calcium oxalate (CaOx) stones are formed in association with sub-epithelial plaques of calcium phosphate (CaP), known as Randall's plaques, on renal papillary surfaces. Crystal formation and retention within the terminal collecting ducts, the ducts of Bellini, leading to the formation of Randall's plugs, is the other pathway. Both pathways require supersaturation leading to crystallization, regulated by various crystallization modulators produced in response to changing urinary conditions...
January 2017: Archivos Españoles de Urología
https://www.readbyqxmd.com/read/28215940/elf5-is-a-principal-cell-lineage-specific-transcription-factor-in-the-kidney-that-contributes-to-aqp2-and-avpr2-gene-expression
#4
Justin Grassmeyer, Malini Mukherjee, Jennifer deRiso, Casey Hettinger, Monica Bailey, Satrajit Sinha, Jane E Visvader, Haotian Zhao, Eric Fogarty, Kameswaran Surendran
The mammalian kidney collecting ducts are critical for water, electrolyte and acid-base homeostasis and develop as a branched network of tubular structures composed of principal cells intermingled with intercalated cells. The intermingled nature of the different collecting duct cell types has made it challenging to identify unique and critical factors that mark and/or regulate the development of the different collecting duct cell lineages. Here we report that the canonical Notch signaling pathway components, RBPJ and Presinilin1 and 2, are involved in patterning the mouse collecting duct cell fates by maintaining a balance between principal cell and intercalated cell fates...
February 16, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28214900/mir-21-regulates-tnf-%C3%AE-induced-cd40-expression-via-the-sirt1-nf-%C3%AE%C2%BAb-pathway-in-renal-inner-medullary-collecting-duct-cells
#5
Qinqin Lin, Yuanwen Geng, Meng Zhao, Shuaishuai Lin, Qing Zhu, Zhenjun Tian
BACKGROUND/AIMS: Recent studies have indicated that microRNA-21 (miR-21) is involved in the inflammatory response in relation to renal disease. Sirtuin1 (SIRT1) exerts renoprotective properties by counteracting inflammation. The activation of CD40 triggers inflammation that participates in renal inflammation and injury. The relationship between miR-21, SIRT1 and CD40, however, remains elusive. METHODS: Immunohistochemistry, small-interfering RNA (siRNA) transfection, quantitative real-time PCR and western blotting were applied to assess the morphological, functional and molecular mechanisms in primary cultured renal inner medullary collecting duct (IMCD) cells...
January 18, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28214561/on-the-development-of-the-hepatopancreatic-ductal-system
#6
REVIEW
Alethia Villasenor, Didier Y R Stainier
The hepatopancreatic ductal system is the collection of ducts that connect the liver and pancreas to the digestive tract. The formation of this system is necessary for the transport of exocrine secretions, for the correct assembly of the pancreatobiliary ductal system, and for the overall function of the digestive system. Studies on endoderm organ formation have significantly advanced our understanding of the molecular mechanisms that govern organ induction, organ specification and morphogenesis of the major foregut-derived organs...
February 16, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28209258/biliary-tract-external-drainage-protects-against-multiple-organs-injuries-of-severe-acute-pancreatitis-rats-via-heme-oxygenase-1-upregulation
#7
Jin-Long Wang, Ying Chen, Xiao-Qing Song, Mei-Ling Lu, Bing Zhao, Li Ma, Er-Zhen Chen, En-Qiang Mao
OBJECTIVE: To investigate the effect of biliary tract external drainage (BTED) on severe acute pancreatitis (SAP) in rats and the relationship with heme oxygenase-1 (HO-1) pathway. METHODS: Thirty SD rats weighing 250-300 g were randomly assigned into five groups (n = 6): sham surgery (SS) group, SAP group, SAP + BTED group, SAP + zinc protoporphyrin IX (ZnPP) group, SAP + BTED + ZnPP group. The SAP model was induced via retrograde injection of 4% sodium taurocholate (1 mL/kg) into biliopancreatic duct through duodenal wall...
February 1, 2017: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
https://www.readbyqxmd.com/read/28208933/a-rare-case-report-of-hepatic-subcapsular-pseudocyst-of-pancreas
#8
Noor Topno, Sandeep Ghosh, Arup Baruah
A pancreatic pseudocyst arises as a result of acute or chronic pancreatitis, pancreatic trauma, or obstruction of the pancreatic duct by a neoplasm. Most of the pseudocysts are located within the head and the body of the pancreas but 20% are extra-pancreatic. We report a case of a 33-year-old gentleman presenting with acute on chronic alcoholic pancreatitis with hepatic sub-capsular pseudocyst involving left lobe of liver, with intra-cystic bleed was successfully treated with Ultrasonography (USG) guided drainage...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208932/spontaneous-rupture-of-the-main-pancreatic-duct-synchronous-with-a-multi-focal-microscopic-pancreatic-adenocarcinoma-a-case-report
#9
Shirly Shohat, Katerina Shulman, Boris Kessel, Oren Gal, Abdel Rauf Zeina
Pancreatic cancer is one of the most lethal types of malignant tumours, commonly diagnosed at an advanced stage. The only curative treatment for this fatal disease is surgery and early diagnosis is the key to a better outcome and prognosis. In this case report we present a 57-year-old woman presenting to the emergency room with abdominal pain and weight loss. Computer Tomography (CT) imaging showed a rupture of the main pancreatic duct and a peri-pancreatic fluid collection with no evidence of a pancreatic mass...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28194573/hyponatremia-and-cyst-growth-in-neonatal-polycystic-kidney-disease-a-case-for-aquaretics
#10
EDITORIAL
Detlef Bockenhauer
Hyponatremia is a common complication in neonatal polycystic kidney disease and is thought to be due to water retention. Aquaretics are drugs that promote free water excretion by blocking the arginine vasopressin receptor type 2 (AVPR2) in the collecting duct and thus impair urinary concentration. AVPR2 is also a key stimulant for cyclic AMP production in the collecting duct and in this way promotes cyst proliferation and pathologic kidney growth in autosomal dominant polycystic kidney disease (ADPKD). Consequently, the aquaretic tolvaptan is now used to slow down progression of ADPKD in adult patients...
February 13, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28192889/effects-of-aristolochic-acid-i-and-or-hypokalemia-on-tubular-damage-in-c57bl-6-rat-with-aristolochic-acid-nephropathy
#11
Joo-Hark Yi, Sang-Woong Han, Wan-Young Kim, Jin Kim, Moon-Hyang Park
Background/Aims: This study was designed to investigate the roles of aristolochic acid I (AA-I) and hypokalemia in acute aristolochic acid nephropathy (AAN). Methods: After an adaptation period (1 week), a total of 40 C57BL/6 mice (male, 8 weeks old) were divided into four groups: I (control group), II (low potassium [K] diet), III (normal K diet with administration of AA-I [10 mg/kg weight]), and IV (low K diet with AA-I). After collecting 24 hours of urine at 2 weeks, the mice were sacrificed, and their blood and kidneys were obtained to perform immunochemical staining and/or Western blot analysis...
February 15, 2017: Korean Journal of Internal Medicine
https://www.readbyqxmd.com/read/28188436/clinical-and-molecular-aspects-of-distal-renal-tubular-acidosis-in-children
#12
Martine T P Besouw, Marc Bienias, Patrick Walsh, Robert Kleta, William G Van't Hoff, Emma Ashton, Lucy Jenkins, Detlef Bockenhauer
BACKGROUND: Distal renal tubular acidosis (dRTA) is characterized by hyperchloraemic metabolic acidosis, hypokalaemia, hypercalciuria and nephrocalcinosis. It is due to reduced urinary acidification by the α-intercalated cells in the collecting duct and can be caused by mutations in genes that encode subunits of the vacuolar H(+)-ATPase (ATP6V1B1, ATP6V0A4) or the anion exchanger 1 (SLC4A1). Treatment with alkali is the mainstay of therapy. METHODS: This study is an analysis of clinical data from a long-term follow-up of 24 children with dRTA in a single centre, including a genetic analysis...
February 10, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28187982/the-renal-trpv4-channel-is-essential-for-adaptation-to-increased-dietary-potassium
#13
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/28186433/production-of-monoclonal-antibody-against-excretory-secretory-antigen-of-fasciola-hepatica-and-evaluation-of-its-efficacy-in-the-diagnosis-of-fascioliasis
#14
Samaneh Abdolahi Khabisi, Bahador Sarkari, Abdolali Moshfe, Sedigheh Jalali
Parasitological methods are not helpful for the diagnosis of fascioliasis in acute and invasive periods of the disease. Detection of coproantigens seems to be a suitable alternative approach in the diagnosis of fascioliasis. The present study aimed to develop a reliable antigen detection system, using monoclonal antibodies raised against excretory-secretory (ES) antigen of Fasciola hepatica, for the diagnosis of fascioliasis. Fasciola adult worms were collected from the bile ducts of infected animals. Species of the fluke was determined by polymerase chain reaction-restriction fragment length polymorphism (RFLP-PCR)...
February 10, 2017: Monoclonal Antibodies in Immunodiagnosis and Immunotherapy
https://www.readbyqxmd.com/read/28181950/clinicopathologic-and-molecular-pathology-of-collecting-duct-carcinoma-and-related-renal-cell-carcinomas
#15
An Na Seo, Ghilsuk Yoon, Jae Y Ro
Collecting duct carcinoma (CDC) and related tumors [ie, renal medullary carcinoma (RMC)] are rare types of highly aggressive renal cell carcinomas (RCC) with poor prognosis. Because of the rarity and diagnostic uncertainty of them, their molecular pathology and significance have not yet been fully elucidated. CDC, RMC, fumarate hydratase-deficient RCC (including hereditary leiomyomatosis and RCC-associated RCC HLRCC-RCC), and recently reported anaplastic lymphoma kinase (ALK)-rearrangement RCC have significant morphologic overlaps, but they are separately distinct entities having different molecular pathway and clinical settings...
March 2017: Advances in Anatomic Pathology
https://www.readbyqxmd.com/read/28179982/spontaneous-biloma-due-to-an-intrahepatic-cholangiocarcinoma-an-extremely-rare-case-report-with-long-term-survival-and-literature-review
#16
Georgios K Georgiou, Athina Tsili, Anna Batistatou, Alexandra Papoudou-Bai, Georgios Papadopoulos, Michalis Fatouros, Georgios K Glantzounis
Cholangiocarcinomas are tumors that arise from the ductal epithelium of the intrahepatic or extra-hepatic bile ducts. Patients are usually asymptomatic or may present with weight loss, fatigue, loss of appetite and abdominal pain (intrahepatic cholangiocarcinomas) or jaundice (extra-hepatic cholangiocarcinomas). Subcapsular bile vessel rupture, due to intrahepatic cholangiocarcinoma, is an extremely rare clinical presentation, which is an emergent and potentially life-threatening complication. We report the case of a 79-year-old female patient suffering from an intrahepatic cholangiocarcinoma that completely obliterated the left main hepatic duct...
February 2017: Annals of Medicine and Surgery
https://www.readbyqxmd.com/read/28179430/polydom-is-an-extracellular-matrix-protein-involved-in-lymphatic-vessel-remodeling
#17
Nanami Morooka, Sugiko Futaki, Ryoko Sato-Nishiuchi, Masafumi Nishino, Yuta Totani, Chisei Shimono, Itsuko Nakano, Hiroyuki Nakajima, Naoki Mochizuki, Kiyotoshi Sekiguchi
: Rationale: Lymphatic vasculature constitutes a second vascular system, essential for immune surveillance and tissue fluid homeostasis. Maturation of the hierarchical vascular structure, with a highly-branched network of capillaries and ducts, is crucial for its function. Environmental cues mediate the remodeling process, but the mechanism that underlies this process is largely unknown. Objective: Polydom (also called Svep1) is an extracellular matrix protein identified as a high-affinity ligand for integrin α9β1...
February 8, 2017: Circulation Research
https://www.readbyqxmd.com/read/28179257/interplay-between-renal-endothelin-and-purinergic-signaling-systems
#18
Eman Y Gohar, Malgorzata Kasztan, David M Pollock
Alterations in extracellular fluid volume regulation and sodium balance may result in the development and maintenance of salt-dependent hypertension, a major risk factor for cardiovascular disease. Numerous pathways contribute to the regulation of sodium excretion and blood pressure, including endothelin and purinergic signaling. Increasing evidence suggests a link between purinergic receptor activation and endothelin production within the renal collecting duct as a means of promoting natriuresis. A better understanding of the relationship between these two systems, especially in regard to sodium homeostasis, will fill a significant knowledge gap and may provide novel antihypertensive treatment options...
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
#19
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/28179253/enac-activity-in-the-cortical-collecting-duct-of-hk%C3%AE-1-h-k-atpase-knockout-mice-is-uncoupled-from-na-intake
#20
Elena Mironova, I Jeanette Lynch, Jonathan M Berman, Michelle L Gumz, James D Stockand, Charles S Wingo
Modulation of the epithelial Na+ channel (ENaC) activity in the collecting duct (CD) is an important mechanism for normal Na+ homeostasis. ENaC activity is inversely related to dietary Na+ intake, in part, due to inhibitory paracrine purinergic regulation. Evidence suggests that H+,K+-ATPase activity in the CD also influences Na+ excretion. We hypothesized that renal H+,K+-ATPases affect Na+ reabsorption by the CD by modulating ENaC activity. ENaC activity in HKα1 H+,K+-ATPase knockout (HKα1-/-) mice was uncoupled from Na+ intake...
February 8, 2017: American Journal of Physiology. Renal Physiology
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