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Gregory Gibson

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https://www.readbyqxmd.com/read/28720653/three-dimensional-structural-analysis-reveals-a-cdk5-mediated-kinase-cascade-regulating-hepatic-biliary-network-branching-in-zebrafish
#1
Manali Dimri, Cassandra Bilogan, Lain X Pierce, Gregory Naegele, Amit Vasanji, Isabel Gibson, Allyson McClendon, Kevin Tae, Takuya F Sakaguchi
The intrahepatic biliary network is a highly branched three-dimensional network lined by biliary epithelial cells, but how its branching patterns are precisely established is not clear. We designed a new computer-based algorithm that quantitatively computes the structural differences of the three-dimensional networks. Utilizing the algorithm, we showed that inhibition of Cyclin-dependent kinase 5 (Cdk5) led to reduced branching in the intrahepatic biliary network in zebrafish. Further, we identified a previously unappreciated downstream kinase cascade regulated by Cdk5...
July 15, 2017: Development
https://www.readbyqxmd.com/read/28686653/ribbon-scanning-confocal-for-high-speed-high-resolution-volume-imaging-of-brain
#2
Alan M Watson, Annika H Rose, Gregory A Gibson, Christina L Gardner, Chengqun Sun, Douglas S Reed, L K Metthew Lam, Claudette M St Croix, Peter L Strick, William B Klimstra, Simon C Watkins
Whole-brain imaging is becoming a fundamental means of experimental insight; however, achieving subcellular resolution imagery in a reasonable time window has not been possible. We describe the first application of multicolor ribbon scanning confocal methods to collect high-resolution volume images of chemically cleared brains. We demonstrate that ribbon scanning collects images over ten times faster than conventional high speed confocal systems but with equivalent spectral and spatial resolution. Further, using this technology, we reconstruct large volumes of mouse brain infected with encephalitic alphaviruses and demonstrate that regions of the brain with abundant viral replication were inaccessible to vascular perfusion...
2017: PloS One
https://www.readbyqxmd.com/read/28671690/skewing-of-the-population-balance-of-lymphoid-and-myeloid-cells-by-secreted-and-intracellular-osteopontin
#3
Masashi Kanayama, Shengjie Xu, Keiko Danzaki, Jason R Gibson, Makoto Inoue, Simon G Gregory, Mari L Shinohara
The balance of myeloid populations and lymphoid populations must be well controlled. Here we found that osteopontin (OPN) skewed this balance during pathogenic conditions such as infection and autoimmunity. Notably, two isoforms of OPN exerted distinct effects in shifting this balance through cell-type-specific regulation of apoptosis. Intracellular OPN (iOPN) diminished the population size of myeloid progenitor cells and myeloid cells, and secreted OPN (sOPN) increase the population size of lymphoid cells...
July 3, 2017: Nature Immunology
https://www.readbyqxmd.com/read/28608985/statistical-performance-of-image-cytometry-for-dna-lipids-cytokeratin-cd45-in-a-model-system-for-circulation-tumor-cell-detection
#4
Gregory L Futia, Isabel R Schlaepfer, Lubna Qamar, Kian Behbakht, Emily A Gibson
Detection of circulating tumor cells (CTCs) in a blood sample is limited by the sensitivity and specificity of the biomarker panel used to identify CTCs over other blood cells. In this work, we present Bayesian theory that shows how test sensitivity and specificity set the rarity of cell that a test can detect. We perform our calculation of sensitivity and specificity on our image cytometry biomarker panel by testing on pure disease positive (D(+) ) populations (MCF7 cells) and pure disease negative populations (D(-) ) (leukocytes)...
June 13, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/28546443/astronaut-ophthalmic-syndrome
#5
Sara R Zwart, Charles R Gibson, Jesse F Gregory, Thomas H Mader, Patrick J Stover, Steven H Zeisel, Scott M Smith
During and after missions on the International Space Station, some astronauts experience ophthalmic changes, including choroidal folds, optic disc edema, cotton-wool spots, globe flattening, and refraction changes. Astronauts with ophthalmic issues had significantly higher plasma concentrations of metabolites that are associated with the 1-carbon metabolic pathway than those without ophthalmic issues. We hypothesized that genetic differences might explain the metabolite differences. Indeed, genetics and B vitamin status were significant predictors of ophthalmic issues...
May 25, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28468916/tumor-derived-%C3%AE-fetoprotein-directly-drives-human-natural-killer-cell-activation-and-subsequent-cell-death
#6
Lazar Vujanovic, Elizabeth C Stahl, Angela D Pardee, David A Geller, Allan Tsung, Simon C Watkins, Gregory A Gibson, Walter J Storkus, Lisa H Butterfield
Hepatocellular carcinoma (HCC) patients with reduced natural killer (NK)-cell numbers and function have been shown to have a poor disease outcome. Mechanisms underlying NK-cell deficiency and dysfunction in HCC patients remain largely unresolved. α-Fetoprotein (AFP) is an oncofetal antigen produced by HCC. Previous studies demonstrated that tumor-derived AFP (tAFP) can indirectly impair NK-cell activity by suppressing dendritic cell function. However, a direct tAFP effect on NK cells remains unexplored. The purpose of this study was to examine the ability of cord blood-derived AFP (nAFP) and that of tAFP to directly modulate human NK-cell activity and longevity in vitro Short-term exposure to tAFP and, especially, nAFP proteins induced a unique proinflammatory, IL2-hyperresponsive phenotype in NK cells as measured by IL1β, IL6, and TNF secretion, CD69 upregulation, and enhanced tumor cell killing...
June 2017: Cancer Immunology Research
https://www.readbyqxmd.com/read/28433852/efficiency-of-low-versus-high-airline-pressure-in-stunning-cattle-with-a-pneumatically-powered-penetrating-captive-bolt-gun
#7
Steffan Edward Octávio Oliveira, Neville George Gregory, Filipe Antonio Dalla Costa, Troy John Gibson, Mateus José Rodrigues Paranhos da Costa
The efficiency of stunning cattle was assessed in 443 animals (304 pure Zebu and 139 crossbred cattle), being mainly mature bulls and cows. Cattle were stunned using a Jarvis pneumatically powered penetrating captive bolt gun operating with low (160-175psi, N=82) and high (190psi, N=363) airline pressure, which was within the manufactures specifications. Signs of brain function and the position of the shots on the heads were recorded after stunning. Velocity of the captive bolt and its physical parameters were calculated...
August 2017: Meat Science
https://www.readbyqxmd.com/read/28375679/dual-phase-iontophoresis-for-the-delivery-of-antisense-oligonucleotides
#8
Daniel J Gibson, Sonal S Tuli, Gregory S Schultz
In support of ongoing research in the study of corneal and skin wound healing, we sought to improve on previously published results by using iontophoresis to deliver RNA interference-based oligonucleotides. By using a electromechanics-based approach, we were able to devise a two-phase solution that separated the buffering solution from the antisense oligonucleotide (ASO) solution. The separation was obtained by making the drug solution a higher density than the buffer, leading it to sink directly onto the tissue surface...
April 4, 2017: Nucleic Acid Therapeutics
https://www.readbyqxmd.com/read/28245323/temporal-trends-in-treatment-and-subsequent-neoplasm-risk-among-5-year-survivors-of-childhood-cancer-1970-2015
#9
MULTICENTER STUDY
Lucie M Turcotte, Qi Liu, Yutaka Yasui, Michael A Arnold, Sue Hammond, Rebecca M Howell, Susan A Smith, Rita E Weathers, Tara O Henderson, Todd M Gibson, Wendy Leisenring, Gregory T Armstrong, Leslie L Robison, Joseph P Neglia
Importance: Cancer treatments are associated with subsequent neoplasms in survivors of childhood cancer. It is unknown whether temporal changes in therapy are associated with changes in subsequent neoplasm risk. Objective: To quantify the association between temporal changes in treatment dosing and subsequent neoplasm risk. Design, Setting, and Participants: Retrospective, multicenter cohort study of 5-year cancer survivors diagnosed before age 21 years from pediatric tertiary hospitals in the United States and Canada between 1970-1999, with follow-up through December 2015...
February 28, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28207886/connective-tissue-growth-factor-is-not-necessary-for-haze-formation-in-excimer-laser-wounded-mouse-corneas
#10
Xiaodi Feng, Liya Pi, Sriniwas Sriram, Gregory S Schultz, Daniel J Gibson
We sought to determine if connective tissue growth factor (CTGF) is necessary for the formation of corneal haze after corneal injury. Mice with post-natal, tamoxifen-induced, knockout of CTGF were subjected to excimer laser phototherapeutic keratectomy (PTK) and the corneas were allowed to heal. The extent of scaring was observed in non-induced mice, heterozygotes, and full homozygous knockout mice and quantified by macrophotography. The eyes from these mice were collected after euthanization for re-genotyping to control for possible Cre-mosaicism...
2017: PloS One
https://www.readbyqxmd.com/read/28128981/development-and-assessment-of-a-novel-canine-ex-vivo-corneal-model
#11
Laura R Proietto, R David Whitley, Dennis E Brooks, Gregory E Schultz, Daniel J Gibson, William M Berkowski, Marc E Salute, Caryn E Plummer
PURPOSE: To develop a novel ex vivo extended culture model of canine corneal epithelial cell wound healing. MATERIALS AND METHODS: Canine corneoscleral rims (CSR) were obtained and, after preparation for culture, were placed on a nutating scaffold and incubated in physiological conditions. In experiment 1, eight CSR in a serum-containing antimicrobial-fortified medium were monitored for epithelial integrity and bacterial infection up to 28 days in culture. CSR were assessed histologically at the end of the culture period end points 0, 7, 14, and 28 days with accompanying scanning electron microscopic (SEM) and transmission electron microscopic (TEM) evaluation...
January 27, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28102376/insights-into-the-mechanism-of-electrochemical-ozone-production-via-water-splitting-on-the-ni-and-sb-doped-sno2-catalyst
#12
Gregory Gibson, Ziyun Wang, Christopher Hardacre, Wen-Feng Lin
The H2O splitting mechanism is a very attractive alternative used in electrochemistry for the formation of O3. The most efficient catalysts employed for this reaction at room temperature are SnO2-based, in particular the Ni/Sb-SnO2 catalyst. In order to investigate the H2O splitting mechanism density functional theory (DFT) was performed on a Ni/Sb-SnO2 surface with oxygen vacancies. By calculating different SnO2 facets, the (110) facet was deemed most stable, and further doped with Sb and Ni. On this surface, the H2O splitting mechanism was modelled paying particular attention to the final two steps, the formation of O2 and O3...
February 1, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28101420/compact-diode-laser-source-for-multiphoton-biological-imaging
#13
Robert D Niederriter, Baris N Ozbay, Gregory L Futia, Emily A Gibson, Juliet T Gopinath
We demonstrate a compact, pulsed diode laser source suitable for multiphoton microscopy of biological samples. The center wavelength is 976 nm, near the peak of the two-photon cross section of common fluorescent markers such as genetically encoded green and yellow fluorescent proteins. The laser repetition rate is electrically tunable between 66.67 kHz and 10 MHz, with 2.3 ps pulse duration and peak powers >1 kW. The laser components are fiber-coupled and scalable to a compact package. We demonstrate >600 μm depth penetration in brain tissue, limited by laser power...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28019691/biofilm-detection-by-wound-blotting-can-predict-slough-development-in-pressure-ulcers-a-prospective-observational-study
#14
Gojiro Nakagami, Gregory Schultz, Daniel J Gibson, Priscilla Phillips, Aya Kitamura, Takeo Minematsu, Tomomitsu Miyagaki, Akitatsu Hayashi, Sanae Sasaki, Junko Sugama, Hiromi Sanada
Bacteria have been found to form multicellular aggregates which have collectively been termed "biofilms." It is hypothesized that biofilm formation is a means to protect bacterial cells including protection form the immune response of humans. This protective mechanism is believed to explain persistent chronic wound infections. At times, the biofilms are abundant enough to see, and remove by simple wiping. However, recent evidence has shown that the removal of these visible portions are not sufficient, and that biofilms can continue to form even with daily wiping...
December 26, 2016: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/27959713/prevention-of-bleeding-in-patients-with-atrial-fibrillation-undergoing-pci
#15
RANDOMIZED CONTROLLED TRIAL
C Michael Gibson, Roxana Mehran, Christoph Bode, Jonathan Halperin, Freek W Verheugt, Peter Wildgoose, Mary Birmingham, Juliana Ianus, Paul Burton, Martin van Eickels, Serge Korjian, Yazan Daaboul, Gregory Y H Lip, Marc Cohen, Steen Husted, Eric D Peterson, Keith A Fox
BACKGROUND: In patients with atrial fibrillation undergoing percutaneous coronary intervention (PCI) with placement of stents, standard anticoagulation with a vitamin K antagonist plus dual antiplatelet therapy (DAPT) with a P2Y12 inhibitor and aspirin reduces the risk of thrombosis and stroke but increases the risk of bleeding. The effectiveness and safety of anticoagulation with rivaroxaban plus either one or two antiplatelet agents are uncertain. METHODS: We randomly assigned 2124 participants with nonvalvular atrial fibrillation who had undergone PCI with stenting to receive, in a 1:1:1 ratio, low-dose rivaroxaban (15 mg once daily) plus a P2Y12 inhibitor for 12 months (group 1), very-low-dose rivaroxaban (2...
December 22, 2016: New England Journal of Medicine
https://www.readbyqxmd.com/read/27933737/testing-the-influence-of-surfactant-based-wound-dressings-on-proteinase-activity
#16
Sunyoung Jeong, Gregory S Schultz, Daniel J Gibson
Proteinases are enzymes that can digest other proteins. In chronic wounds, a sub-class of these enzymes with the ability to degrade the extracellular matrix (matrix metalloproteinases, MMPs) have been found to both inhibit healing and to be able to aid in enzymatically debriding a wound. Enzymatic debridement using the enzymes present in a wound is generally called autolytic debridement. Clinicians seeking to employ autolytic debridement typically use occlusive materials such as medical honey, alginate dressings and other occlusive dressings...
December 8, 2016: International Wound Journal
https://www.readbyqxmd.com/read/27905186/severe-asthma-current-management-targeted-therapies-and-future-directions-a-roundtable-report
#17
REVIEW
Vanessa M McDonald, Steven Maltby, Helen K Reddel, Gregory G King, Peter A B Wark, Lorraine Smith, John W Upham, Alan L James, Guy B Marks, Peter G Gibson
Asthma is a chronic respiratory disease characterized by respiratory symptoms, airway inflammation, airway obstruction and airway hyper-responsiveness. Asthma is common and directly affects 10% of Australians, 1-5% of adults in Asia and 300 million people worldwide. It is a heterogeneous disorder with many clinical, molecular, biological and pathophysiological phenotypes. Current management strategies successfully treat the majority of patients with asthma who have access to them. However, there is a subset of an estimated 5-10% of patients with asthma who have severe disease and are disproportionately impacted by symptoms, exacerbations and overall illness burden...
January 2017: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/27881555/recurrent-hospitalization-among-patients-with-atrial-fibrillation-undergoing-intracoronary-stenting-treated-with-2-treatment-strategies-of-rivaroxaban-or-a-dose-adjusted-oral-vitamin-k-antagonist-treatment-strategy
#18
RANDOMIZED CONTROLLED TRIAL
C Michael Gibson, Duane S Pinto, Gerald Chi, Douglas Arbetter, Megan Yee, Roxana Mehran, Christoph Bode, Jonathan Halperin, Freek W A Verheugt, Peter Wildgoose, Paul Burton, Martin van Eickels, Serge Korjian, Yazan Daaboul, Purva Jain, Gregory Y H Lip, Marc Cohen, Eric D Peterson, Keith A A Fox
BACKGROUND: Patients with atrial fibrillation who undergo intracoronary stenting traditionally are treated with a vitamin K antagonist (VKA) plus dual antiplatelet therapy (DAPT), yet this treatment leads to high risks of bleeding. We hypothesized that a regimen of rivaroxaban plus a P2Y12 inhibitor monotherapy or rivaroxaban plus DAPT could reduce bleeding and thereby have a favorable impact on all-cause mortality and the need for rehospitalization. METHODS: Stented subjects with nonvalvular atrial fibrillation (n=2124) were randomized 1:1:1 to administration of reduced-dose rivaroxaban 15 mg daily plus a P2Y12 inhibitor for 12 months (group 1); rivaroxaban 2...
January 24, 2017: Circulation
https://www.readbyqxmd.com/read/27849786/142-elevated-carboxyhemoglobin-levels-in-patients-requiring-extracorporeal-membrane-oxygenation
#19
Nimesh Shah, Colin Gibson, Gregory Kitchen, Michael Hockstein, Mladen Sokolovic
No abstract text is available yet for this article.
December 2016: Critical Care Medicine
https://www.readbyqxmd.com/read/27820947/effect-of-temporal-changes-in-therapeutic-exposure-on-self-reported-health-status-in-childhood-cancer-survivors
#20
Kirsten K Ness, Melissa M Hudson, Kendra E Jones, Wendy Leisenring, Yutaka Yasui, Yan Chen, Marilyn Stovall, Todd M Gibson, Daniel M Green, Joseph P Neglia, Tara O Henderson, Jacqueline Casillas, Jennifer S Ford, Karen E Effinger, Kevin R Krull, Gregory T Armstrong, Leslie L Robison, Kevin C Oeffinger, Paul C Nathan
Background: The effect of temporal changes in cancer therapy on health status among childhood cancer survivors has not been evaluated. Objective: To compare proportions of self-reported adverse health status outcomes among childhood cancer survivors across 3 decades. Design: Cross-sectional. (ClinicalTrials.gov: NCT01120353). Setting: 27 North American institutions. Participants: 14 566 adults, who survived for 5 or more years after initial diagnosis (median age, 27 years; range, 18 to 48 years), treated from 1970 to 1999...
January 17, 2017: Annals of Internal Medicine
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