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https://www.readbyqxmd.com/read/28061633/mechanisms-of-bone-response-to-injury
#1
Keren E Dittmer, Elwyn C Firth
Bone, despite its relatively inert appearance, is a tissue that is capable of adapting to its environment. Wolff's law, first described in the 19th century, describes the ability of bone to change structure depending on the mechanical forces applied to it. The mechanostat model extended this principle and suggested that the amount of strain a bone detects depends on bone strength and the amount of muscle force applied to the bone. Experimental studies have found that low-magnitude, high-frequency mechanical loading is considered to be the most effective at increasing bone formation...
January 1, 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/28036031/drug-transporter-expression-and-activity-in-human-hepatoma-huh-7-cells
#2
Elodie Jouan, Marc Le Vée, Claire Denizot, Yannick Parmentier, Olivier Fardel
Human hepatoma cells may represent a valuable alternative to the use of human hepatocytes for studying hepatic drug transporters, which is now a regulatory issue during drug development. In the present work, we have characterized hepatic drug transporter expression, activity and regulation in human hepatoma HuH-7 cells, in order to determine the potential relevance of these cells for drug transport assays. HuH-7 cells displayed notable multidrug resistance-associated protein (MRP) activity, presumed to reflect expression of various hepatic MRPs, including MRP2...
December 28, 2016: Pharmaceutics
https://www.readbyqxmd.com/read/28029505/parenteral-nutrition-dysregulates-bile-salt-homeostasis-in-a-rat-model-of-parenteral-nutrition-associated-liver-disease
#3
Kiran V K Koelfat, Frank G Schaap, Caroline M J M Hodin, Ruben G J Visschers, Björn I Svavarsson, Martin Lenicek, Ronit Shiri-Sverdlov, Kaatje Lenaerts, Steven W M Olde Damink
BACKGROUND & AIMS: Parenteral nutrition (PN), a lifesaving therapy in patients with intestinal failure, has been associated with hepatobiliary complications including steatosis, cholestasis and fibrosis, collectively known as parenteral nutrition-associated liver disease (PNALD). To date, the pathogenesis of PNALD is poorly understood and therapeutic options are limited. Impaired bile salt homeostasis has been proposed to contribute PNALD. The objective of this study was to establish a PNALD model in rats and to evaluate the effects of continuous parenteral nutrition (PN) on bile salt homeostasis...
September 24, 2016: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28027573/defects-in-myo5b-are-associated-with-a-spectrum-of-previously-undiagnosed-low-%C3%AE-glutamyltransferase-cholestasis
#4
Yi-Ling Qiu, Jing-Yu Gong, Jia-Yan Feng, Ren-Xue Wang, Jun Han, Teng Liu, Yi Lu, Li-Ting Li, Mei-Hong Zhang, Jonathan A Sheps, Neng-Li Wang, Yan-Yan Yan, Jia-Qi Li, Lian Chen, Christoph H Borchers, Bence Sipos, A S Knisely, Victor Ling, Qing-He Xing, Jian-She Wang
: Hereditary cholestasis in childhood and infancy with normal serum gamma-glutamyltransferase activity (GGT) is linked to several genes. Many patients, however, remain genetically undiagnosed. Defects in myosin 5B (MYO5B) cause microvillus inclusion disease (MVID, MIM251850) with recurrent watery diarrhea. Cholestasis reported as an atypical presentation in MVID has been considered a side effect of parenteral alimentation. Here, however, we report ten patients who experienced cholestasis associated with biallelic, or suspected biallelic, mutations in MYO5B and who neither had recurrent diarrhea nor received parenteral alimentation...
December 27, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28012258/functional-defect-of-variants-in-the-adenosine-triphosphate-binding-sites-of-abcb4-and-their-rescue-by-the-cystic-fibrosis-transmembrane-conductance-regulator-potentiator-ivacaftor-vx-770
#5
Jean-Louis Delaunay, Alix Bruneau, Brice Hoffmann, Anne-Marie Durand-Schneider, Véronique Barbu, Emmanuel Jacquemin, Michèle Maurice, Chantal Housset, Isabelle Callebaut, Tounsia Aït-Slimane
: ABCB4 (MDR3) is an adenosine triphosphate (ATP)-binding cassette (ABC) transporter expressed at the canalicular membrane of hepatocytes, where it mediates phosphatidylcholine (PC) secretion. Variations in the ABCB4 gene are responsible for several biliary diseases, including progressive familial intrahepatic cholestasis type 3 (PFIC3), a rare disease that can be lethal in the absence of liver transplantation. In this study, we investigated the effect and potential rescue of ABCB4 missense variations that reside in the highly conserved motifs of ABC transporters, involved in ATP binding...
November 5, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28010140/the-cellular-basis-of-platelet-secretion-emerging-structure-function-relationships
#6
Shilpi Yadav, Brian Storrie
Platelet activation has long been known to be accompanied by secretion from at least three types of compartments. These include dense granules, the major source of small molecules; α-granules, the major protein storage organelle; and lysosomes, the site of acid hydrolase storage. Despite ~60 years of research, there are still many unanswered questions about the cell biology of platelet secretion: for example, how are these secretory organelles organized to support cargo release and what are the key routes of cargo release, granule to plasma membrane or granule to canalicular system...
December 23, 2016: Platelets
https://www.readbyqxmd.com/read/28005745/indian-survey-on-practice-patterns-of-lacrimal-and-eyelid-disorders-isupple-report-2-mitomycin-c-and-lacrimal-stents-in-dacryocystorhinostomy
#7
Akshay Gopinathan Nair, Saurabh Kamal, Aniruddha Agarwal
PURPOSE: The aim of the study was to assess practice patterns on the use of intraoperative Mitomycin-C (MMC) and lacrimal stents (intubation) in dacryocystorhinostomy (DCR) for nasolacrimal duct obstruction (NLDO) among oculoplastic surgeons in India. The survey was aimed at obtaining data on the duration of stent placement and specifics regarding MMC usage namely, concentration and duration of application. METHODS: A survey that included questions on the management of lacrimal disorders was sent in April 2015 to members of the Oculoplastic Association of India, through an email communication...
November 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27990621/high-definition-dacryoendoscopic-features-of-a-canalicular-squamous-papilloma
#8
Mohammad Javed Ali, Swati Singh, Milind N Naik
No abstract text is available yet for this article.
December 18, 2016: International Ophthalmology
https://www.readbyqxmd.com/read/27988401/geniposide-attenuates-anit-induced-cholestasis-through-regulation-of-transporters-and-enzymes-involved-in-bile-acids-homeostasis-in-rats
#9
Lingling Wang, Guixin Wu, Feihua Wu, Nan Jiang, Yining Lin
ETHNOPHARMACOLOGICAL RELEVANCE: Geniposide (GE) is one of the major iridoid glycosides isolated from the fruit of Gardenia jasminoides Ellis that has been used to treat hepatic disorders including cholestasis. However, the underlying mechanisms for GE ameliorating the reduction in bile acids accumulation by α-naphthylisothiocyanate (ANIT) remain unclear. AIM OF THE STUDY: The purpose of this study is to characterize the efficacy of GE in regulation of bile acids uptake, synthesis, metabolism, and transport in ANIT-induced rats...
January 20, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/27981939/canalicular-adenoma-arising-in-buccal-mucosa
#10
Manas Bajpai
No abstract text is available yet for this article.
November 2016: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/27981592/the-ascending-pathophysiology-of-cholestatic-liver-disease
#11
REVIEW
Peter L M Jansen, Ahmed Ghallab, Nachiket Vartak, Raymond Reif, Frank G Schaap, Jochen Hampe, Jan G Hengstler
In this review we develop the argument that cholestatic liver diseases, particularly PBC and PSC, evolve over time with anatomically an ascending course of the disease process. The first and early lesions are in 'downstream' bile ducts. This eventually leads to cholestasis and this causes bile salt-mediated toxic injury of the 'upstream' liver parenchyma. Bile salts are toxic in high concentration. These concentrations are present in the canalicular network, bile ducts and gallbladder. Leakage of bile from this network and ducts could be an important driver of toxicity...
December 16, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/27933662/evidence-of-staphylococcus-aureus-deformation-proliferation-and-migration-in-canaliculi-of-live-cortical-bone-in-murine-models-of-osteomyelitis
#12
Karen L de Mesy Bentley, Ryan Trombetta, Kohei Nishitani, Sheila N Bello-Irizarry, Mark Ninomiya, Longze Zhang, Hung Li Chung, James L McGrath, John L Daiss, Hani A Awad, Stephen L Kates, Edward M Schwarz
While Staphylococcus aureus osteomyelitis is considered to be incurable, the major bacterial reservoir in live cortical bone has remained unknown. In addition to biofilm bacteria on necrotic tissue and implants, studies have implicated intracellular infection of osteoblasts and osteocytes as a mechanism of chronic osteomyelitis. Thus, we performed the first systematic transmission electron microscopy (TEM) studies to formally define major reservoirs of S. aureus in chronically infected mouse (Balb/c J) long bone tissue...
December 8, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/27932171/recurrence-of-progressive-familial-intrahepatic-cholestasis-type-2-phenotype-after-living-donor-liver-transplantation-a-case-report
#13
K Masahata, S Uehara, S Ibuka, K Nakahata, Y Hasegawa, H Kondou, R Kubitz, T Ueno
BACKGROUND: Progressive familial intrahepatic cholestasis 2 (PFIC2) is the result of mutations in the ABCB11, which encodes for bile salt export pump (BSEP). An absence of BSEP in the canalicular membrane causes cholestasis and leads to the development of end-stage liver disease in the first decade of life. Liver transplantation (LT) has been considered curative for BSEP disease. However, patients with PFIC2 having undergone LT have recently been reported to develop recurrence of cholestasis together with the clinical and histological features of primary BSEP disease...
November 2016: Transplantation Proceedings
https://www.readbyqxmd.com/read/27930424/characterizing-the-occluded-lacrimal-punctum-using-anterior-segment-optical-coherence-tomography
#14
Hannah M Timlin, Pearse A Keane, Geoffrey E Rose, Daniel G Ezra
PURPOSE: Epiphora is sometimes associated with an absent or occluded lacrimal drainage punctum (or puncta). This study uses noninvasive "enhanced depth" anterior segment optical coherence tomography (OCT) to give improved characterization and understanding of absent or fully occluded puncta and the underlying canaliculus. METHODS: Anterior segment spectral domain OCT images were collected prospectively from 9 lower puncta of 6 patients with epiphora and absent or fully occluded puncta, not amenable to dilation in clinic, to see if a canaliculus was visible on OCT imaging below the occluded punctum...
December 7, 2016: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/27928879/minimally-invasive-glaucoma-surgery-as-primary-stand-alone-surgery-for-glaucoma
#15
REVIEW
Nathan M Kerr, Jing Wang, Keith Barton
Recently many new devices and procedures have been developed to lower intraocular pressure in a less invasive and purportedly safer manner than traditional glaucoma surgery. These new devices might encourage an earlier transition to surgery and reduce the long term commitment to topical glaucoma medications with their associated compliance and intolerance issues. While often seen as an adjunct to cataract surgery, a growing body of evidence suggests that primary MIGS may be a viable initial treatment option...
December 8, 2016: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/27923925/biliary-secretion-of-quasi-enveloped-human-hepatitis-a-virus
#16
Asuka Hirai-Yuki, Lucinda Hensley, Jason K Whitmire, Stanley M Lemon
: Hepatitis A virus (HAV) is an unusual picornavirus that is released from cells cloaked in host-derived membranes. These quasi-enveloped virions (eHAV) are the only particle type circulating in blood during infection, whereas only nonenveloped virions are shed in feces. The reason for this is uncertain. Hepatocytes, the only cell type known to support HAV replication in vivo, are highly polarized epithelial cells with basolateral membranes facing onto hepatic (blood) sinusoids and apical membranes abutting biliary canaliculi from which bile is secreted to the gut...
December 6, 2016: MBio
https://www.readbyqxmd.com/read/27913845/mitogen-activated-protein-kinases-are-involved-in-hepatocanalicular-dysfunction-and-cholestasis-induced-by-oxidative-stress
#17
Flavia D Toledo, Cecilia L Basiglio, Ismael R Barosso, Andrea C Boaglio, Andrés E Zucchetti, Enrique J Sánchez Pozzi, Marcelo G Roma
In previous studies, we showed that the pro-oxidant model agent tert-butyl hydroperoxide (tBuOOH) induces alterations in hepatocanalicular secretory function by activating Ca(2+)-dependent protein kinase C isoforms (cPKC), via F-actin disorganization followed by endocytic internalization of canalicular transporters relevant to bile formation (Mrp2, Bsep). Since mitogen-activated protein kinases (MAPKs) may be downstream effectors of cPKC, we investigated here the involvement of the MAPKs of the ERK1/2, JNK1/2, and p38(MAPK) types in these deleterious effects...
December 2, 2016: Archives of Toxicology
https://www.readbyqxmd.com/read/27913639/modulation-of-apical-constriction-by-wnt-signaling-is-required-for-lung-epithelial-shape-transition
#18
Katsumi Fumoto, Hisako Takigawa-Imamura, Kenta Sumiyama, Tomoyuki Kaneiwa, Akira Kikuchi
In lung development the apically constricted columnar epithelium forms numerous buds during the pseudoglandular stage and subsequently changes the shape into flat or cuboidal pneumocytes that compose the air sacs during the canalicular and saccular (canalicular-saccular) stages, yet the impact of cell shapes on tissue morphogenesis remains unclear. The expression of Wnt components were decreased in the canalicular-saccular stages, and genetically constitutive activation of Wnt signaling impaired air sac formation by inducing apical constriction in the epithelium as seen in the pseudoglandular stage...
December 2, 2016: Development
https://www.readbyqxmd.com/read/27896266/in-vitro-bone-cell-models-impact-of-fluid-shear-stress-on-bone-formation
#19
REVIEW
Claudia Wittkowske, Gwendolen C Reilly, Damien Lacroix, Cecile M Perrault
This review describes the role of bone cells and their surrounding matrix in maintaining bone strength through the process of bone remodeling. Subsequently, this work focusses on how bone formation is guided by mechanical forces and fluid shear stress in particular. It has been demonstrated that mechanical stimulation is an important regulator of bone metabolism. Shear stress generated by interstitial fluid flow in the lacunar-canalicular network influences maintenance and healing of bone tissue. Fluid flow is primarily caused by compressive loading of bone as a result of physical activity...
2016: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/27894031/artificial-placenta-analysis-of-recent-progress
#20
REVIEW
Stephen D Bird
The artificial placenta (AP) has for many decades captured the imagination of scientists and authors with popular fiction including The Matrix and Aldous Huxley's "Brave New World", depicting a human surviving ex-utero in an artificial uterine environment (AUE). For scientists this has fascinated as a way forward for extremely preterm infants (EPIs) born less than 28 weeks of gestation. Early successes with mechanical ventilation (MV) for infants born above 28 weeks of gestation meant that AP research lost momentum...
January 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
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