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https://www.readbyqxmd.com/read/28197649/dose-response-relationship-of-temozolomide-determined-by-the-pig-a-comet-and-micronucleus-assay
#1
M Guérard, G Johnson, S Dertinger, G Duran-Pacheco, J Funk, A Zeller
Temozolomide (TMZ), a monofunctional alkylating agent, was selected as a model compound to determine its quantitative genotoxic dose-response relationship in different tissues (blood, liver, and jejunum) and endpoints [Pig-a-, comet-, and micronucleus assay (MNT)] in male rats. TMZ was administered p.o. over 5 consecutive days (day 1-5), followed by a treatment-free period of 50 days (day 6-56) and a final administration prior to necropsy (day 57-59). TMZ showed a dose-dependent increase in DNA damage in all interrogated endpoints...
February 15, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28187951/omp16-based-vaccine-encapsulated-by-alginate-chitosan-microspheres-provides-significant-protection-against-haemophilus-parasuis-in-mice
#2
Xintian Zheng, Xiaoyan Yang, Xiaohua Li, Guo-Hua Qiu, Ailing Dai, Qichun Huang, Cuiqin Huang, Xiaofeng Guo
Haemophilus parasuis (H. parasuis) is the etiological agent of swine Glässer's disease, which leads to significant economic loss in swine industry over the world. Subunit vaccine based on outer membrane protein is one of the promising choices to protect pigs against H. parasuis infection despite low immunity efficiency. In this paper, outer membrane protein 16 (Omp16) of H. parasuis encapsulated by alginate-chitosan microspheres as antigen carriers was explored for the first time in a mouse model. Our results showed that the microspheres with Omp16 induced significant higher H...
February 7, 2017: Vaccine
https://www.readbyqxmd.com/read/28182785/virulence-and-immunogenicity-of-genetically-defined-human-and-porcine-isolates-of-m-avium-subsp-hominissuis-in-an-experimental-mouse-infection
#3
Nicolas Bruffaerts, Christelle Vluggen, Virginie Roupie, Lucille Duytschaever, Christophe Van den Poel, Joseph Denoël, Ruddy Wattiez, Jean-Jacques Letesson, David Fretin, Leen Rigouts, Ophélie Chapeira, Vanessa Mathys, Claude Saegerman, Kris Huygen
Mycobacterium avium subsp. hominissuis (Mah) represents a health concern for humans and to a lesser extent for pigs, but its zoonotic potential remains elusive. Using multispacer sequence typing (MST) we previously identified 49 different genotypes of Mah among Belgian clinical and porcine isolates, with 5 MSTs shared by both hosts. Using experimental intranasal infection of BALB/c mice, we compared the virulence and immunogenicity of porcine and clinical human isolates with shared genotype or with a genotype only found in humans or pigs...
2017: PloS One
https://www.readbyqxmd.com/read/28182434/a-model-based-approach-to-assessing-the-importance-of-intracellular-binding-sites-in-doxorubicin-disposition
#4
Ilse R Dubbelboer, Elsa Lilienberg, Erik Sjögren, Hans Lennernas
Doxorubicin is an anticancer agent, which binds reversibly to topoisomerase I and II, intercalates to DNA base-pairs, and generates free radicals. Doxorubicin has a high tissue:plasma partition coefficient and high intracellular binding to the nucleus and other subcellular compartments. The metabolite doxorubicinol has an extensive tissue distribution. This study investigated whether the traditional implementation of tissue binding, described by the tissue:plasma partition coefficient (Kp,t), could be used to appropriately analyze and/or simulate tissue doxorubicin and doxorubicinol concentrations, when applying a physiologically based pharmacokinetic (PBPK) model approach or whether intracellular binding is required in the semi-PBPK model...
February 9, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28177652/irreversible-electroporation-defining-the-mri-appearance-of-the-ablation-zone-with-histopathologic-correlation-in-a-porcine-liver-model
#5
Ely R Felker, Isabel Dregely, Dong Jin Chung, Kyunghyun Sung, Ferdnand C Osuagwu, Charles Lassman, James Sayre, Holden Wu, David S Lu
OBJECTIVE: The purpose of this study is to evaluate the MRI appearance of the irreversible electroporation zone in porcine liver, with histopathologic correlation. MATERIALS AND METHODS: Nine irreversible electroporation ablations were percutaneously created in two Yorkshire pigs. Irreversible electroporation was performed with a bipolar 16-gauge electrode with 3-cm exposure tip and fixed 8-mm interpolar distance. Gadoxetate disodium-enhanced 3-T MRI was performed 50 hours after irreversible electroporation...
February 8, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28167864/ezetimibe-reduces-cholesterol-content-and-nf-kappab-activation-in-liver-but-not-in-intestinal-tissue-in-guinea-pigs
#6
Peter Fraunberger, Elisabeth Gröne, Hermann-Josef Gröne, Heinz Drexel, Autar K Walli
BACKGROUND: Statins (HMG CoA reductase inhibitors), in addition to reducing circulating cholesterol and incidence of coronary heart disease, also have pleiotropic, anti-inflammatory effects. Patients with chronic liver diseases, non-alcoholic fatty liver disease (NAFLD) or hepatitis C are often excluded from statin therapy because of adverse effects in a small cohort of patients despite increased cardiovascular risk cholesterol. Ezetimibe, which inhibits cholesterol absorption by inhibition of Niemann-Pick C1 like 1 (NPC1L1) protein in the brush border of intestinal cells, has been suggested as a new therapeutic option in these patients...
2017: Journal of Inflammation
https://www.readbyqxmd.com/read/28157787/nonclinical-evaluation-of-the-new-topical-hemostatic-agent-tt-173-for-skin-grafting-procedures
#7
Santiago Rojas Codina, José Raúl Herance, Alberto Centeno, Javier Valero, Belén Arias, Ignasi Miquel, Pilar Sánchez, Esther Rincón, Ramón López, Jesús Murat
Blood loss during grafting surgery represents a major concern of this procedure and the development of hemostatic agents for this indication is highly desirable. TT-173 is the first biologically active treatment based on tissue factor instead of thrombin. This study sought to investigate the efficacy, systemic absorption, and toxicology of TT-173 in animal models to support clinical evaluation of the product in donor sites of patients subjected to skin grafting. Procoagulant efficacy of 148 μg of TT-173 was evaluated in pigs in presence and absence of anticoagulant treatment with unfractioned heparin...
January 31, 2017: Journal of Burn Care & Research: Official Publication of the American Burn Association
https://www.readbyqxmd.com/read/28151798/modulating-portal-hemodynamics-with-vascular-ring-allows-efficient-regeneration-after-partial-hepatectomy-in-a-porcine-model
#8
Petru O Bucur, Mohamed Bekheit, Chloe Audebert, Amnah Othman, Seddik Hammad, Mylene Sebagh, Marc-Antoine Allard, Benoît Decante, Adrian Friebel, Elodie Miquelestorena-Standley, Dirk Drasdo, Jan G Hengstler, Irene E Vignon-Clementel, Eric Vibert
OBJECTIVE: To investigate safety and efficacy of temporary portal hemodynamics modulation with a novel percutaneously adjustable vascular ring (MID-AVR) onto a porcine model of 75% hepatectomy. BACKGROUND: Postoperative liver failure is a leading cause of mortality after major hepatectomy. Portal flow modulation is an increasingly accepted concept to prevent postoperative liver failure. Nonetheless, the current strategies have shortcomings. METHODS: Resection was performed under hemodynamic monitoring in 17 large, white pigs allocated into 2 groups...
February 1, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28126682/a-multi-species-evaluation-of-the-radiation-dosimetry-of-11-c-erlotinib-the-radiolabeled-analog-of-a-clinically-utilized-tyrosine-kinase-inhibitor
#9
J Ryan Petrulli, Søren B Hansen, Galith Abourbeh, Maqsood Yaqub, Idris Bahce, Daniel Holden, Yiyun Huang, Nabeel B Nabulsi, Joseph N Contessa, Eyal Mishani, Adriaan A Lammertsma, Evan D Morris
INTRODUCTION: Erlotinib is a tyrosine kinase inhibitor prescribed for non-small cell lung cancer (NSCLC) patients bearing epidermal growth factor receptor mutations in the kinase domain. The objectives of this study were to (1) establish a human dosimetry profile of [(11)C]erlotinib and (2) assess the consistency of calculated equivalent dose across species using the same dosimetry model. METHODS: Subjects examined in this multi-species study included: a stage IIIa NSCLC patient, 3 rhesus macaque monkeys, a landrace pig, and 4 athymic nude-Fox1nu mice...
January 2, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28122484/anatomic-peculiarities-of-pig-and-human-liver
#10
Andriy Nykonenko, Petr Vávra, Pavel Zonča
Many investigations on surgical methods and medical treatment are currently done on pigs. This is possible because the pig is sufficiently close genetically to humans. In recent years, progress in liver surgery has opened new possibilities in surgical treatment of liver diseases. Because the methods are relatively novel, various improvements are still needed, and it is thus helpful to conduct experimental surgeries on pig livers. We reviewed the literature to compare the anatomic and functional features of pig and human livers, information that will be of great importance for improving surgical techniques...
February 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28115250/lead-adsorption-anticoagulation-and-in-vivo-toxicity-studies-on-the-new-magnetic-nanomaterial-fe3o4-sio2-dmsa-as-a-hemoperfusion-adsorbent
#11
Yang Xiang, Zhiming Bai, Shufang Zhang, Yan Sun, Shunlan Wang, Xiaobin Wei, Wenshi Mo, Jiale Long, Zhenxiang Liu, Chao Yang, Linlin Zheng, Xueyi Guo, Wang Xiaoyang, Fangfang Mao, Ningchuan Feng
This project aimed to develop and characterize a new nanoadsorbent for hemoperfusion. Fe3O4 nanoparticles synthesized by a facile solvothermal method were coated with SiO2 and further modified by DMSA. TEM, XRD, FTIR, XPS and SEM were performed before and after lead adsorption to reveal the general performance and adsorption mechanism. Rabbit lead poisoning models were established to study the adsorption rate; then, a pig hemoperfusion experiment was used for further validation. In addition, coagulation, liver, kidney and heart function, blood lipids, electrolytes and the immune inflammatory system were studied before and after hemoperfusion...
January 20, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28097603/comprehensive-preclinical-evaluation-of-a-multi-physics-model-of-liver-tumor-radiofrequency-ablation
#12
Chloé Audigier, Tommaso Mansi, Hervé Delingette, Saikiran Rapaka, Tiziano Passerini, Viorel Mihalef, Marie-Pierre Jolly, Raoul Pop, Michele Diana, Luc Soler, Ali Kamen, Dorin Comaniciu, Nicholas Ayache
PURPOSE: We aim at developing a framework for the validation of a subject-specific multi-physics model of liver tumor radiofrequency ablation (RFA). METHODS: The RFA computation becomes subject specific after several levels of personalization: geometrical and biophysical (hemodynamics, heat transfer and an extended cellular necrosis model). We present a comprehensive experimental setup combining multimodal, pre- and postoperative anatomical and functional images, as well as the interventional monitoring of intra-operative signals: the temperature and delivered power...
January 17, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28096727/new-radiofrequency-device-to-reduce-bleeding-after-core-needle-biopsy-experimental-study-in-a-porcine-liver-model
#13
Sanghyeok Lim, Hyunchul Rhim, Min Woo Lee, Kyoung Doo Song, Tae Wook Kang, Young-Sun Kim, Hyo Keun Lim
OBJECTIVE: To evaluate the in vivo efficiency of the biopsy tract radiofrequency ablation for hemostasis after core biopsy of the liver in a porcine liver model, including situations with bleeding tendency and a larger (16-gauge) core needle. MATERIALS AND METHODS: A preliminary study was performed using one pig to determine optimal ablation parameters. For the main experiment, four pigs were assigned to different groups according to heparinization use and biopsy needle caliber...
January 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28094579/expression-profile-of-the-integrin-receptor-subunits-in-the-guinea-pig-sclera
#14
Kevin K Wang, Ravikanth Metlapally, Christine F Wildsoet
PURPOSE: The ocular dimensional changes in myopia reflect increased scleral remodeling, and in high myopia, loss of scleral integrity leads to biomechanical weakening and continued scleral creep. As integrins, a type of cell surface receptors, have been linked to scleral remodeling, they represent potential targets for myopia therapies. As a first step, this study aimed to characterize the integrin subunits at the messenger RNA level in the sclera of the guinea pig, a more recently added but increasingly used animal model for myopia research...
January 17, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28070463/impact-of-birth-weight-and-postnatal-diet-on-the-gut-microbiota-of-young-adult-guinea-pigs
#15
Kait Al, Ousseynou Sarr, Kristyn Dunlop, Gregory B Gloor, Gregor Reid, Jeremy Burton, Timothy R H Regnault
BACKGROUND: The gastrointestinal tract (GIT) microbiota is essential to metabolic health, and the prevalence of the Western diet (WD) high in fat and sugar is increasing, with evidence highlighting a negative interaction between the GIT and WD, resulting in liver dysfunction. Additionally, an adverse in utero environment such as placental insufficiency resulting in low birth weight (LBW) offspring, contributes to an increased risk of metabolic diseases such as fatty liver infiltration and liver dysfunction in later life...
2017: PeerJ
https://www.readbyqxmd.com/read/28063306/constitutive-expression-and-activity-of-cytochrome-p450-in-conventional-pigs
#16
Søren Drud Nielsen, Yvonne Bauhaus, Galia Zamaratskaia, Matheus Antunes Junqueira, Karoline Blaabjerg, Bjørn Petrat-Melin, Jette Feveile Young, Martin Krøyer Rasmussen
Pigs have often been suggested to be a useful model for humans, when investigating CYP dependent events, like drug metabolism. However, comprehensive knowledge about the constitutive expression of the major CYP and corresponding transcription factors is limited. We compared the constitutive mRNA expression of aryl hydrocarbon receptor, constitutive androstane receptor and pregnane X receptor and CYP1A1, CYP1A2, CYP2A, CYP2E1 and CYP3A in liver, adipose tissue, muscle and small intestine in pigs, as well as the expression along the length of the small intestine and colon...
December 23, 2016: Research in Veterinary Science
https://www.readbyqxmd.com/read/28060824/chronological-profiling-of-plasma-native-peptides-after-hepatectomy-in-pigs-toward-the-discovery-of-human-biomarkers-for-liver-regeneration
#17
Kohta Iguchi, Etsuro Hatano, Takashi Nirasawa, Noriyuki Iwasaki, Motohiko Sato, Gen Yamamoto, Kenya Yamanaka, Tatsuya Okamoto, Yosuke Kasai, Naohiko Nakamura, Hiroaki Fuji, Tomohito Sakai, Nobuto Kakuda, Satoru Seo, Kojiro Taura, Kei Tashiro, Shinji Uemoto, Masaya Ikegawa
Liver regeneration after partial hepatectomy (PHx) is a time-dependent process, which is tightly regulated by multiple signaling cascades. Failure of this complex process leads to posthepatectomy liver failure (PHLF), which is associated with a high rate of mortality. Thus, it is extremely important to establish a useful biomarker of liver regeneration to help prevent PHLF. Here, we hypothesized that alterations in the plasma peptide profile may predict liver regeneration following PHx and hence we set up a diagnostic platform for monitoring posthepatectomy outcome...
2017: PloS One
https://www.readbyqxmd.com/read/28057907/molecular-cloning-and-characterization-of-the-porcine-ribosomal-protein-l21
#18
Wu-Sheng Sun, Ju-Lan Chun, Dong-Hwan Kim, Jin-Seop Ahn, Min-Kyu Kim, In-Sul Hwang, Dae-Jin Kwon, Seong-Soo Hwang, Jeong-Woong Lee
Ribosomal protein L21 (RPL21) is a structural component of the 60S subunit of the eukaryotic ribosome. This protein plays an important role in protein synthesis and the occurrence of hereditary diseases. Pig is a common laboratory model, however, to the best of our knowledge, its RPL21 gene has not been cloned to date. In this study, we cloned and identified the full-length sequence of the pig RPL21 gene for the first time. Then we studied its expression pattern and function by overexpression or knockdown approach...
January 4, 2017: Journal of Veterinary Science
https://www.readbyqxmd.com/read/28053091/fumarylacetoacetate-hydrolase-knockout-rabbit-model-for-hereditary-tyrosinemia-type-1
#19
Li Li, Quanjun Zhang, Huaqiang Yang, Qingjian Zou, Chengdan Lai, Fei Jiang, Ping Zhao, Zhiwei Luo, Jiayin Yang, Qian Chen, Yan Wang, Philip N Newsome, Jon Frampton, Patrick H Maxwell, Wenjuan Li, Shuhan Chen, Dongye Wang, Tak-Shing Siu, Sidney Tam, Hung-Fat Tse, Baoming Qin, Xichen Bao, Miguel A Esteban, Liangxue Lai
Hereditary tyrosinemia type 1 (HT1) is a severe human autosomal recessive disorder caused by the deficiency of fumarylacetoacetate hydroxylase (FAH), an enzyme catalyzing the last step in the tyrosine degradation pathway. Lack of FAH causes accumulation of toxic metabolites (fumarylacetoacetate and succinylacetone) in blood and tissues, ultimately resulting in severe liver and kidney damage with onset that ranges from infancy to adolescence. This tissue damage is lethal but can be controlled by administration of 2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedion (NTBC), which inhibits tyrosine catabolism upstream of the generation of fumarylacetoacetate and succinylacetone...
January 4, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28039700/extended-hepatectomy-using-the-bipolar-tissue-sealer-an-experimental-model-of-small-for-size-syndrome-in-pigs
#20
Antonios Athanasiou, Michael Kontos, Emmanouil Pikoulis, John Griniatsos, Apostolos Papalois, Eleftherios Spartalis, Demetrios Moris, Evangelos Felekouras, Theodoros Liakakos
PURPOSE: After liver transplantation with a small-for-size liver graft or after extensive hepatectomy for liver malignancies or other non malignant conditions with an insufficient liver volume, the survival of patients depends on liver regeneration. This study was carried out in order to create a new porcine model for the study of small-for-size syndrome (SFSS) after extensive hepatectomy. METHODS: In the present study we used 23 domestic Landrace pigs weighing 28...
November 2016: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
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