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https://www.readbyqxmd.com/read/28805978/obeticholic-acid-a-selective-farnesoid-x-receptor-agonist-regulates-bile-acid-homeostasis-in-sandwich-cultured-human-hepatocytes
#1
Yuanyuan Zhang, Jonathan P Jackson, Robert L St Claire, Kimberly Freeman, Kenneth R Brouwer, Jeffrey E Edwards
Farnesoid X receptor (FXR) is a master regulator of bile acid homeostasis through transcriptional regulation of genes involved in bile acid synthesis and cellular membrane transport. Impairment of bile acid efflux due to cholangiopathies results in chronic cholestasis leading to abnormal elevation of intrahepatic and systemic bile acid levels. Obeticholic acid (OCA) is a potent and selective FXR agonist that is 100-fold more potent than the endogenous ligand chenodeoxycholic acid (CDCA). The effects of OCA on genes involved in bile acid homeostasis were investigated using sandwich-cultured human hepatocytes...
August 2017: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/28772351/the-influence-of-functional-warm-ischemia-time-on-dcd-liver-transplant-recipients-outcomes
#2
Jessica C Coffey, Kerollos N Wanis, Diethard Monbaliu, Nicholas Gilbo, Markus Selzner, Neeta Vachharajani, Mark A Levstik, Max Marquez, Mb Majella Doyle, Jacques Pirenne, David Grant, Julie K Heimbach, William Chapman, Kelly Vogt, Roberto Hernandez-Alejandro
BACKGROUND: Duration of functional warm ischemia (f-WIT) is thought to have a causal effect on outcomes in controlled donation after circulatory death (DCD) liver transplantation (LT). METHODS: A retrospective cohort study was conducted at five centers. Data were extracted on donor and recipient characteristics, with attention to parameters recorded during withdrawal of life support to in-situ cold perfusion. F-WIT was the time elapsed from any of the hemodynamic and oxygenation parameters to the start of in-situ cold perfusion...
August 3, 2017: Clinical Transplantation
https://www.readbyqxmd.com/read/28763485/cxcr2-signaling-and-the-microbiome-suppress-inflammation-bile-duct-injury-and-the-phenotype-of-experimental-biliary-atresia
#3
Junbae Jee, Reena Mourya, Pranavkumar Shivakumar, Lin Fei, Michael Wagner, Jorge A Bezerra
Biliary atresia is progressive fibro-inflammatory cholangiopathy of young children. Central to pathogenic mechanisms of injury is the tissue targeting by the innate and adaptive immune cells. Among these cells, neutrophils and the IL-8/Cxcl-8 signaling via its Cxcr2 receptor have been linked to bile duct injury. Here, we aimed to investigate whether the intestinal microbiome modulates Cxcr2-dependent bile duct injury and obstruction. Adult wild-type (WT) and Cxcr2-/- mice were fed a diet supplemented with sulfamethoxazole/trimethoprim (SMZ/TMP) during pregnancy and lactation, and their pups were injected intraperitoneally with rhesus rotavirus (RRV) within 24 hours of life to induce experimental biliary atresia...
2017: PloS One
https://www.readbyqxmd.com/read/28757171/genetic-determinants-of-cholangiopathies-molecular-and-systems-genetics
#4
REVIEW
Matthias C Reichert, Rabea A Hall, Marcin Krawczyk, Frank Lammert
Familial cholangiopathies are rare but potentially severe diseases. Their spectrum ranges from fairly benign conditions as, for example, benign recurrent intrahepatic cholestasis to low-phospholipid associated cholelithiasis and progressive familial intrahepatic cholestasis (PFIC). Many cholangiopathies such as primary biliary cholangitis (PBC) or primary sclerosing cholangitis (PSC) affect first the bile ducts ("ascending pathophysiology") but others, such as PFIC, start upstream in hepatocytes and cause progressive damage "descending" down the biliary tree and leading to end-stage liver disease...
July 27, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28754453/pathophysiologic-implications-of-innate-immunity-and-autoinflammation-in-the-biliary-epithelium
#5
REVIEW
Mario Strazzabosco, Romina Fiorotto, Massimiliano Cadamuro, Carlo Spirli, Valeria Mariotti, Eleanna Kaffe, Roberto Scirpo, Luca Fabris
The most studied physiological function of biliary epithelial cells (cholangiocytes) is to regulate bile flow and composition, in particular the hydration and alkalinity of the primary bile secreted by hepatocytes. After almost three decades of studies it is now become clear that cholangiocytes are also involved in epithelial innate immunity, in inflammation, and in the reparative processes in response to liver damage. An increasing number of evidence highlights the ability of cholangiocyte to undergo changes in phenotype and function in response to liver damage...
July 25, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28754451/role-of-inflammation-and-proinflammatory-cytokines-in-cholangiocyte-pathophysiology
#6
REVIEW
Claudio, Debora Maria Giordano, Luca Maroni, Marco Marzioni
Cholangiocytes, the epithelial cells lining the bile ducts, are an important subset of liver cells. They are involved in the modification of bile volume and composition, and respond to endogenous and exogenous stimuli. Along the biliary tree, two different kinds of cholangiocytes exist: small and large cholangiocytes. Each type has different features and biological role in physiologic and pathologic conditions, and their immunobiology is important for understanding biliary diseases. Cholangiocytes provide the first line of defence against luminal microbes in the hepatobiliary system...
July 25, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28735981/autoimmune-liver-disease-in-children-with-sickle-cell-disease
#7
Suttiruk Jitraruch, Emer Fitzpatrick, Maesha Deheragoda, Annamaria Deganello, Giorgina Mieli-Vergani, Susan Height, David Rees, Nedim Hadzic, Marianne Samyn
OBJECTIVE: To assess the incidence, clinical features, and outcome of autoimmune liver disease (AILD) in patients with sickle cell disease (SCD). STUDY DESIGN: Single center retrospective review of patients with SCD with AILD referred between 1999 and 2015. RESULTS: Thirteen of 77 (17%) patients with SCD with hepatic dysfunction were diagnosed with AILD (median age 11, range, 3.4-16 years) with a female preponderance (77%). Acute hepatitis and insidious onset were the commonest presentations...
July 20, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/28711597/micrornas-and-extracellular-vesicles-in-cholangiopathies
#8
REVIEW
P Olaizola, P Y Lee-Law, A Arbelaiz, A Lapitz, M J Perugorria, L Bujanda, J M Banales
Cholangiopathies encompass a heterogeneous group of disorders affecting biliary epithelial cells (i.e. cholangiocytes). Early diagnosis, prognosis and treatment still remain clinically challenging for most of these diseases and are critical for adequate patient care. In the past decade, extensive research has emphasized microRNAs (miRs) as potential non-invasive biomarkers and tools to accurately identify, predict and treat cholangiopathies. MiRs can be released extracellularly conjugated with lipoproteins or encapsulated in extracellular vesicles (EVs)...
July 12, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28710035/association-of-common-genetic-variants-in-vegfa-with-biliary-atresia-susceptibility-in-northwestern-han-chinese
#9
Bailing Liu, Jingli Wei, Miao Li, Jue Jiang, Hui Zhang, Li Yang, Haibin Wu, Qi Zhou
Biliary atresia (BA) is a major neonatal obliterative cholangiopathy, resulting in progressive cirrhosis. The gene VEGFA encodes a heparin-binding protein that is a regulator of angiogenesis and a mediator of inflammatory reactions, and accumulating evidence have indicated that VEGFA may play a possible role in the pathogenesis of BA. Our study aim was to evaluate the association of common variants within the VEGFA gene with BA susceptibility in Northwestern Han Chinese population. Forty tag SNPs within the VEGFA gene were selected in the study, and then subsequently genotyped in 1336 Northwestern Han Chinese individuals, consisting of 311 BA patients and 1025 healthy controls...
July 11, 2017: Gene
https://www.readbyqxmd.com/read/28706986/liver-preservation-by-aortic-perfusion-alone-compared-with-preservation-by-aortic-perfusion-and-additional-arterial-ex-situ-back-table-perfusion-with-histidine-tryptophan-ketoglutarate-solution-a-prospective-randomized-controlled-multicenter-study
#10
Gerd Otto, Michael Heise, Jochen Thies, Michael Pitton, Jens Schneider, Gernot Kaiser, Peter Neuhaus, Otto Kollmar, Michael Barthels, Josef Geks, Wolf Otto Bechstein, Achim Hellinger, Jürgen Klempnauer, Winfried Padberg, Nils Frühauf, Andre Ebbing, Dietmar Mauer, Astrid Schneider, Robert Kwiecien, Kai Kronfeld
BACKGROUND: Arterial ex situ back-table perfusion (BP) reportedly reduces ischemic-type biliary lesion after liver transplantation. We aimed to verify these findings in a prospective investigation. METHODS: Our prospective, randomized, controlled, multicenter study involved livers retrieved from patients in 2 German regions, and compared the outcomes of standard aortic perfusion to those of aortic perfusion combined with arterial ex situ BP. The primary endpoint was the incidence of ischemic-type biliary lesions over a follow-up of 2 years after liver transplantation, whereas secondary endpoints included 2-year graft survival, initial graft damage as reflected by transaminase levels, and functional biliary parameters at 6 months after transplantation...
July 2017: Transplantation Direct
https://www.readbyqxmd.com/read/28699603/infants-with-extrahepatic-biliary-atresia-effect-of-follow-up-on-the-survival-rate-at-ege-university-medical-school-transplantation-center
#11
Miray Karakoyun, Maşallah Baran, Caner Turan, Murat Kılıç, Orkan Ergun, Sema Aydoğdu
BACKGROUND/AIMS: Biliary atresia (BA) is the main cause of neonatal cholestasis and the primary reason for infant liver transplants worldwide. It is an obliterative cholangiopathy observed only in children and caused by progressive inflammation and fibrosis of the bile duct. We collaborated with a liver transplantation center to investigate the effects of follow-up in patients with BA. MATERIALS AND METHODS: Medical records of 99 patients who were diagnosed with BA and monitored at our center from 1990 to 2002 (27 patients) and from 2003 to 2015 (72 patients) were analyzed retrospectively...
July 2017: Turkish Journal of Gastroenterology: the Official Journal of Turkish Society of Gastroenterology
https://www.readbyqxmd.com/read/28690174/clinical-outcomes-of-donation-after-circulatory-death-liver-transplantation-in-primary-sclerosing-cholangitis
#12
Palak J Trivedi, Irene Scalera, Emma Slaney, Richard W Laing, Bridget Gunson, Gideon M Hirschfield, Andrea Schlegel, James Ferguson, Paolo Muiesan
BACKGROUND & AIM: Primary sclerosing cholangitis (PSC) is a progressive fibro-inflammatory cholangiopathy for which liver transplantation is the only life-extending intervention. These patients may benefit from accepting liver donation after circulatory death (DCD), however their subsequent outcome is unknown. The aim of this study was to determine the clinical impact of using DCD liver grafts in patients specifically undergoing transplantation for PSC. METHODS: Clinical outcomes were prospectively evaluated in PSC patients undergoing transplantation from 2006 to 2016 stratified by donor type (DCD, n=35 vs...
July 8, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28671339/role-of-erbb-her-family-of-receptor-tyrosine-kinases-in-cholangiocyte-biology
#13
REVIEW
Anna Pellat, Javier Vaquero, Laura Fouassier
The ErbB/HER family comprises four distinct tyrosine kinase receptors, EGFR/ErbB1/HER1, ErbB2/HER2, ErbB3/HER3 and ErbB4/HER4, which trigger intracellular signals at the origin of essential cellular functions including differentiation, proliferation, survival and migration. Epithelial cells, named cholangiocytes, that line intrahepatic and extrahepatic bile ducts, contribute substantially to biliary secretory functions and bile transport. Although ErbB receptors have been widely studied in cholangiocarcinoma (CCA), a malignancy of the biliary tract, knowledge of these receptors in biliary epithelium physiology and in non-malignant cholangiopathies is far from completed...
July 3, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28648950/mechanisms-of-cholangiocyte-responses-to-injury
#14
REVIEW
Keisaku Sato, Fanyin Meng, Thao Giang, Shannon Glaser, Gianfranco Alpini
Cholangiocytes, epithelial cells that line the biliary epithelium, are the primary target cells for cholangiopathies including primary sclerosing cholangitis and primary biliary cholangitis. Quiescent cholangiocytes respond to biliary damage and acquire an activated neuroendocrine phenotype to maintain the homeostasis of the liver. The typical response of cholangiocytes is proliferation leading to bile duct hyperplasia, which is a characteristic of cholestatic liver diseases. Current studies have identified various signaling pathways that are associated with cholangiocyte proliferation/loss and liver fibrosis in cholangiopathies using human samples and rodent models...
June 23, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28645651/post-transplant-cholangiopathy-classification-pathogenesis-and-preventive-strategies
#15
REVIEW
Yvonne de Vries, Fien A von Meijenfeldt, Robert J Porte
Biliary complications are the most frequent cause of morbidity, re-transplantation, and even mortality after liver transplantation. In general, biliary leakage and anastomotic and non-anastomotic biliary strictures (NAS) can be recognized. There is no consensus on the exact definition of NAS and different names and criteria have been used in literature. We propose to use the term post-transplant cholangiopathy for the spectrum of abnormalities of large donor bile ducts, that includes NAS, but also intraductal casts and intrahepatic biloma formation, in the presence of a patent hepatic artery...
June 20, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28638943/elevated-serum-heat-shock-protein-70-and-liver-stiffness-reflect-hepatic-dysfunction-and-severity-in-postoperative-biliary-atresia
#16
Sittisak Honsawek, Wanvisa Udomsinprasert, Napaphat Jirathanathornnukul, Voranush Chongsrisawat, Yong Poovorawan
BACKGROUND: Biliary atresia (BA) is a severe chronic liver disease characterized by progressive obstructive cholangiopathy of biliary tract. Heat shock protein 70 (HSP70) is involved in protecting cells against a wide variety of stress and plays a protective role in tissue damage. The purpose of this study was to investigate serum HSP70 and liver stiffness in BA and determine the association of serum HSP70, liver stiffness, and outcome parameters in post-Kasai BA patients. METHODS: One hundred post-Kasai BA patients and 40 controls were enrolled...
August 2017: Pediatric Surgery International
https://www.readbyqxmd.com/read/28635176/genetic-loss-of-the-muscarinic-m3-receptor-m3-r-markedly-alters-bile-formation-and-cholestatic-liver-injury-in-mice
#17
Franziska Durchschein, Elisabeth Krones, Marion J Pollheimer, Gernot Zollner, Martin Wagner, Jean-Pierre Raufman, Peter Fickert
Hepatic innervation represents a potentially underestimated regulator of liver function and regeneration. The muscarinic 3 receptor (M3 -R) is the primary cholangiocyte receptor for the afferent parasympathetic innervation of bile ducts. We aimed to determine the specific role of the M3 -R in bile formation and models for cholestatic liver disease in mice. We compared bile flow and composition in M3 -R knock-out mice (M3 -R(-/-) ) and wild type littermates (WT). M3 -R(-/-) mice showed significantly reduced bile flow compared to WT mice, most likely due to decreased biliary HCO3(-) secretion...
June 21, 2017: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/28634212/prolonged-darkness-reduces-liver-fibrosis-in-a-mouse-model-of-primary-sclerosing-cholangitis-by-mir-200b-down-regulation
#18
Nan Wu, Fanyin Meng, Tianhao Zhou, Yuyan Han, Lindsey Kennedy, Julie Venter, Heather Francis, Sharon DeMorrow, Paolo Onori, Pietro Invernizzi, Francesca Bernuzzi, Romina Mancinelli, Eugenio Gaudio, Antonio Franchitto, Shannon Glaser, Gianfranco Alpini
Melatonin therapy or prolonged exposure to complete darkness reduces biliary hyperplasia and liver fibrosis in bile-duct-ligated (BDL) rats; however, no information exists in primary sclerosing cholangitis (PSC). Thus, we aimed to determine the therapeutic effects of prolonged dark therapy or melatonin administration on hepatic fibrosis in the Mdr2(-/-) mouse model of PSC. Melatonin levels, biliary mass, liver fibrosis, angiogenesis and miR-200b expression were evaluated in wild-type and Mdr2(-/-) mice exposed to darkness or melatonin treatment or in male PSC patient samples and healthy controls...
June 20, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28556380/waitlist-outcomes-for-patients-relisted-following-failed-donation-after-cardiac-death-liver-transplant-implications-for-awarding-meld-exception-scores
#19
Kristopher P Croome, David D Lee, Justin H Nguyen, Andrew P Keaveny, C Burcin Taner
Understanding of outcomes for patients re-listed for ischemic cholangiopathy (IC) following a donation after cardiac death (DCD) liver transplant (LT) will help standardization of MELD exception scheme for re-transplantation. Early relisting (E-RL) for DCD graft failure due to PNF or HAT was defined as re-listing ≤ 14 days after DCD-LT, late relisting (L-RL) due to biliary complications was defined as re-listing 14 days- 3 years after DCD-LT. Of 3908 DCD-LT performed nationally between 2002-2016, 540 (13...
May 29, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28526690/emerging-concepts-in-biliary-repair-and-fibrosis
#20
REVIEW
Luca Fabris, Carlo Spirli, Massimiliano Cadamuro, Romina Fiorotto, Mario Strazzabosco
Chronic diseases of the biliary tree (cholangiopathies) represent one of the major unmet needs in clinical hepatology and a significant knowledge gap in liver pathophysiology. The common theme in cholangiopathies is that the target of the disease is the biliary tree. After damage to the biliary epithelium, inflammatory changes stimulate a reparative response with proliferation of cholangiocytes and restoration of the biliary architecture, owing to the reactivation of a variety of morphogenetic signals. Chronic damage and inflammation will ultimately result in pathological repair with generation of biliary fibrosis and clinical progression of the disease...
August 1, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
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