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https://www.readbyqxmd.com/read/28330614/a-predictive-3d-multi-scale-model-of-biliary-fluid-dynamics-in-the-liver-lobule
#1
Kirstin Meyer, Oleksandr Ostrenko, Georgios Bourantas, Hernan Morales-Navarrete, Natalie Porat-Shliom, Fabian Segovia-Miranda, Hidenori Nonaka, Ali Ghaemi, Jean-Marc Verbavatz, Lutz Brusch, Ivo Sbalzarini, Yannis Kalaidzidis, Roberto Weigert, Marino Zerial
Bile, the central metabolic product of the liver, is transported by the bile canaliculi network. The impairment of bile flow in cholestatic liver diseases has urged a demand for insights into its regulation. Here, we developed a predictive 3D multi-scale model that simulates fluid dynamic properties successively from the subcellular to the tissue level. The model integrates the structure of the bile canalicular network in the mouse liver lobule, as determined by high-resolution confocal and serial block-face scanning electron microscopy, with measurements of bile transport by intravital microscopy...
March 15, 2017: Cell Systems
https://www.readbyqxmd.com/read/28327602/glucocorticoid-suppression-of-osteocyte-perilacunar-remodeling-is-associated-with-subchondral-bone-degeneration-in-osteonecrosis
#2
Tristan W Fowler, Claire Acevedo, Courtney M Mazur, Faith Hall-Glenn, Aaron J Fields, Hrishikesh A Bale, Robert O Ritchie, Jeffrey C Lotz, Thomas P Vail, Tamara Alliston
Through a process called perilacunar remodeling, bone-embedded osteocytes dynamically resorb and replace the surrounding perilacunar bone matrix to maintain mineral homeostasis. The vital canalicular networks required for osteocyte nourishment and communication, as well as the exquisitely organized bone extracellular matrix, also depend upon perilacunar remodeling. Nonetheless, many questions remain about the regulation of perilacunar remodeling and its role in skeletal disease. Here, we find that suppression of osteocyte-driven perilacunar remodeling, a fundamental cellular mechanism, plays a critical role in the glucocorticoid-induced osteonecrosis...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28273180/synthesis-in-vitro-and-in-vivo-evaluation-of-3%C3%AE-18f-fluorocholic-acid-for-the-detection-of-drug-induced-cholestasis-in-mice
#3
Stef De Lombaerde, Sara Neyt, Ken Kersemans, Jeroen Verhoeven, Lindsey Devisscher, Hans Van Vlierberghe, Christian Vanhove, Filip De Vos
INTRODUCTION: Drug-induced cholestasis is a liver disorder that might be caused by interference of drugs with the hepatobiliary bile acid transporters. It is important to identify this interference early on in drug development. In this work, Positron Emission Tomography (PET)-imaging with a 18F labeled bile acid analogue was introduced to detect disturbed hepatobiliary transport of bile acids. METHODS: 3β-[18F]fluorocholic acid ([18F]FCA) was prepared by nucleophilic substitution of a mesylated precursor with [18F]fluoride, followed by deprotection with sodium hydroxide...
2017: PloS One
https://www.readbyqxmd.com/read/28272174/endoscopic-features-of-a-lacrimal-sac-in-a-case-of-punctal-and-canalicular-agenesis
#4
Mohammad Javed Ali, Swati Singh, Milind N Naik
No abstract text is available yet for this article.
March 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28261774/evaluation-of-anatomical-and-functional-outcomes-in-patients-undergoing-repair-of-traumatic-canalicular-laceration
#5
Hasan Aytoğan, Şeyda Karadeniz Uğurlu
BACKGROUND: The present study was designed to evaluate functional and anatomical success of traumatic canalicular laceration repair. METHODS: Consecutive patients who presented at Atatürk Training and Research Hospital Eye Clinic, İzmir Katip Çelebi University Faculty of Medicine and had canalicular laceration repair performed by the same surgeon between January 2009 and December 2014 were included in the study. Demographic data, length of time between injury and surgery, and cause of the trauma, surgical method employed, and duration of follow-up were recorded...
January 2017: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/28250999/a-rare-case-of-rivaroxaban-causing-delayed-symptomatic-hepatocellular-injury-and-hyperbilirubinemia
#6
Keith Glenn, Patrick Chen, Mustafa Musleh, Rao Pallivi, Melissa Grilliot
Importance. As Rivaroxaban has increased in popularity, it has been accompanied with a growing body of evidence displaying its ability to cause drug induced liver injury (DILI). Observation. A 74-year-old Caucasian female developed Rivaroxaban DILI two weeks after finishing a 14-day course. The patient was symptomatic and jaundiced with elevated transaminases and hyperbilirubinemia with normal lab values two months priorly. Liver biopsies showed mixed inflammatory infiltrate of lymphocytes, neutrophils and eosinophils, rare necrotic hepatocytes, and canalicular and intrahepatocellular cholestasis, all of which are consistent with DILI...
2017: Case Reports in Gastrointestinal Medicine
https://www.readbyqxmd.com/read/28249699/detection-of-high-biliary-and-fecal-viral-loads-in-patients-with-chronic-hepatitis-c-virus-infection
#7
Hugo Monrroy, Jenniffer Angulo, Karla Pino, Pilar Labbé, Juan Francisco Miquel, Marcelo López-Lastra, Alejandro Soza
BACKGROUND: The life cycle of the hepatitis C virus (HCV) is closely associated with lipid metabolism. Recently, NPC1L1 (a cholesterol transporter) has been reported to function as an HCV receptor. This receptor is expressed in the hepatocyte canalicular membrane and in the intestine; serving as a key transporter for the cholesterol enterohepatic cycle. OBJECTIVES: We hypothesized that HCV might have a similar cycle, so we aimed to study the presence of HCV in bile and stools of infected patients...
February 26, 2017: Gastroenterología y Hepatología
https://www.readbyqxmd.com/read/28249282/progress-in-the-molecular-characterization-of-hepatobiliary-transporters
#8
Dietrich Keppler
Over the last 25 years, our understanding of the driving forces for hepatobiliary elimination and knowledge of the molecular basis of uptake and efflux transport in hepatocytes have undergone fundamental changes. This refers to bile acids and many other endogenous substances as well as to drugs that are eliminated on the hepatobiliary route. In this development, not only molecular cloning, functional characterization, and localization of transporters were decisive, but also the discovery of hereditary mutations in genes encoding sinusoidal uptake transporters and canalicular export pumps in humans and rodents...
2017: Digestive Diseases
https://www.readbyqxmd.com/read/28249278/mechanisms-of-tauroursodeoxycholate-mediated-hepatoprotection
#9
Dieter Häussinger, Claus Kordes
Ursodeoxycholate and its taurine conjugate tauroursodeoxycholate (TUDC) promote choleresis by triggering the insertion of transport proteins for bile acids into the canalicular and basolateral membranes of hepatocytes. In addition, TUDC exerts hepatoprotective and anti-apoptotic effects, can counteract the action of toxic bile acids and reduce endoplasmic reticulum stress. TUDC can also initiate the differentiation of multipotent mesenchymal stem cells (MSC) including hepatic stellate cells and promote their development into hepatocyte-like cells...
2017: Digestive Diseases
https://www.readbyqxmd.com/read/28249274/the-emerging-role-of-soluble-adenylyl-cyclase-in-primary-biliary-cholangitis
#10
Jung-Chin Chang, Ulrich Beuers, Ronald P J Oude Elferink
BACKGROUND: Primary biliary cholangitis (PBC; previously referred to as primary biliary cirrhosis) is a chronic fibrosing cholangiopathy with the signature of an autoimmune disease and features of intrahepatic cholestasis. Immunosuppressing treatments are largely unsuccessful. Responsiveness to ursodeoxycholic acid and reduced expression of anion exchanger 2 (AE2) on canalicular membranes and small bile ducts underline the importance of bicarbonate transportation in its disease mechanism...
2017: Digestive Diseases
https://www.readbyqxmd.com/read/28248874/clinical-features-and-surgical-outcomes-of-primary-canaliculitis-with-concretions
#11
Shengjin Xiang, Bin Lin, Qintuo Pan, Meiqin Zheng, Xiaoyi Qin, Youpei Wang, Zongduan Zhang
The purpose of our study is to analyze the clinical, ultrasonic, microbiologic, and histopathologic characteristics, management, and outcomes in a series of primary canaliculitis with concretions patients who underwent canaliculotomy with curettage.Thirty-six patients were reviewed for age, sex, location and laterality, duration of symptoms, clinical symptoms, ultrasonic signs, result of microbiologic culture and histopathologic examination, treatment, and outcomes. Main outcomes were the clinical, ultrasonic, and microbiological characteristics of the canalicular concretions; the histopathologic profiles; and the treatment effect...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28245962/targeted-pharmacotherapies-for-defective-abc-transporters
#12
REVIEW
Virginie Vauthier, Chantal Housset, Thomas Falguières
Human ABC (ATP Binding Cassette) transporters form a superfamily of forty-eight transmembrane proteins, which transport their substrates across biological membranes against important concentration gradients, in an energy-dependent manner. Gene variations in approximately half of these transporters have been identified in subjects with rare and often severe genetic diseases, highlighting the importance of their biological function. For missense variations leading to defects in ABC transporters, the current challenge is to identify new molecules with therapeutic potential able to rescue the induced molecular deficiency...
February 27, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28243017/comparison-of-the-efficacies-of-0-94-mm-and-double-silicone-tubes-for-treatment-of-canalicular-obstruction
#13
Seong Chan Choi, Hye Sun Choi, Jae Woo Jang, Sung Joo Kim, Jung Hye Lee
PURPOSE: To compare the clinical effects of the single wide-diameter bicanalicular silicone tube and the double bicanalicular silicone tube in endonasal dacryocystorhinostomy (DCR) with canalicular trephinization for canalicular obstruction. METHODS: We retrospectively reviewed the records of 121 patients with monocanalicular or common canalicular obstruction who had undergone endonasal DCR with random bicanalicular insertion of either double silicone tubes (insertion of two tubes into each canaliculus) or a single wide-diameter (0...
February 2017: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/28242992/somatostatin-receptor-spect-ct-using-99m-tc-labeled-hynic-toc-aids-in-diagnosis-of-primary-optic-nerve-sheath-meningioma
#14
Piyush Chandra, Nilendu Purandare, Sneha Shah, Archi Agrawal, Venkatesh Rangarajan
Primary optic nerve sheath meningiomas (ONSM) are rare, benign and slow growing tumor involving the intra-orbital/intra-canalicular segment of the optic nerve. Untreated, they can potentially lead to visual deterioration. Magnetic resonance (MR) is the gold standard imaging modality for diagnosing the entity. Often, a clinical dilemma exists to narrow the differential diagnosis of an enhancing intra-orbital mass on MR. Molecular imaging provides a high degree of precision in diagnosing meningioma in view of relatively high levels of somatostatin receptor expression by these tumors...
January 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/28223721/current-and-future-therapies-for-inherited-cholestatic-liver-diseases
#15
REVIEW
Wendy L van der Woerd, Roderick Hj Houwen, Stan Fj van de Graaf
Familial intrahepatic cholestasis (FIC) comprises a group of rare cholestatic liver diseases associated with canalicular transport defects resulting predominantly from mutations in ATP8B1, ABCB11 and ABCB4. Phenotypes range from benign recurrent intrahepatic cholestasis (BRIC), associated with recurrent cholestatic attacks, to progressive FIC (PFIC). Patients often suffer from severe pruritus and eventually progressive cholestasis results in liver failure. Currently, first-line treatment includes ursodeoxycholic acid in patients with ABCB4 deficiency (PFIC3) and partial biliary diversion in patients with ATP8B1 or ABCB11 deficiency (PFIC1 and PFIC2)...
February 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28221291/ophthalmic-manifestations-of-facial-dog-bites-in-children
#16
Emily M Bratton, Liliya Golas, Leslie A Wei, Brett W Davies, Vikram D Durairaj
PURPOSE: To characterize ophthalmic manifestations and periocular injuries of pediatric facial dog bites. METHODS: A retrospective review of all children younger than 18 years who sought medical attention after a dog bite to the face between January 1, 2003 and May 22, 2014 was performed at a large tertiary pediatric hospital. Data on type and location of injury, surgical intervention, and complications were collected. RESULTS: A total of 1,989 children aged 0...
February 17, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28220208/abcb4-missense-mutations-d243a-k435t-g535d-i490t-r545c-and-s978p-significantly-impair-the-lipid-floppase-and-likely-predispose-to-secondary-pathologies-in-the-human-population
#17
Edward J Andress, Michael Nicolaou, Farrell McGeoghan, Kenneth J Linton
Bile salts are natural detergents required to solubilise dietary fat and lipid soluble vitamins. They are synthesised in hepatocytes and secreted into the luminal space of the biliary tree by the bile salt export pump (BSEP), an ATP-binding cassette (ABC) transporter in the canalicular membrane. BSEP deficiency causes cytotoxic accumulation of bile salts in the hepatocyte that results in mild-to-severe forms of cholestasis. The resulting inflammation can also progress to hepatocellular cancer via a novel mechanism involving upregulation of proliferative signalling pathways...
February 20, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28216153/dynamic-modulation-of-cyp21a1-21-hydroxylase-expression-sites-in-the-mouse-developing-lung
#18
Catherine Gilbert, Pierre R Provost, Yves Tremblay
21-hydroxylase is expressed in the developing lung where it is proposed as a local source of glucocorticoids playing important roles in lung development. We have studied the precise sites of Cyp21a1 expression in the developing mouse lung from the pseudoglandular stage (gestation day (GD) 15.5) to the alveolar stage (postnatal day (PND) 15) by in situ hybridization. Cyp21a1-mRNA was found mainly in epithelial cells from GD 15.5 to PND 5, but the precise site of expression shifted from the distal epithelium during the pseudoglandular and the canalicular stages including the distal epithelium without lumina, to the proximal epithelium and the wall of developing saccules during the perinatal period (GD 19...
February 17, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28207432/spontaneous-canalicular-plug-erosion-after-punctal-plug-placement
#19
Xinxin Zhang, Maya Bitar, Richard M Davis
PURPOSE: To describe a case of keratoconjunctivitis sicca treated with punctal plug placement with the first reported complication of subsequent plug erosion through the canaliculus and extrusion through the lid. METHODS: Punctal plugs were placed in a patient with Sjogren syndrome for treatment of keratoconjunctivitis sicca. More than 12 years later, the plug was noted to have eroded through the canaliculus and extruded through the conjunctiva and lid. RESULTS: The extruded plug was removed, and punctal cautery was performed on 2 other puncta with improved symptom control...
February 15, 2017: Cornea
https://www.readbyqxmd.com/read/28180039/endoscopic-endonasal-optic-nerve-decompression-for-fibrous-dysplasia
#20
Timothy R DeKlotz, S Tonya Stefko, Juan C Fernandez-Miranda, Paul A Gardner, Carl H Snyderman, Eric W Wang
Objective To evaluate visual outcomes and potential complications for optic nerve decompression using an endoscopic endonasal approach (EEA) for fibrous dysplasia. Design Retrospective chart review of patients with fibrous dysplasia causing extrinsic compression of the canalicular segment of the optic nerve that underwent an endoscopic endonasal optic nerve decompression at the University of Pittsburgh Medical Center from 2010 to 2013. Main Outcome Measures The primary outcome measure assessed was best-corrected visual acuity (BCVA) with secondary outcomes, including visual field testing, color vision, and complications associated with the intervention...
February 2017: Journal of Neurological Surgery. Part B, Skull Base
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