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https://www.readbyqxmd.com/read/28719102/plant-viral-and-bacteriophage-delivery-of-nucleic-acid-therapeutics
#1
REVIEW
Patricia Lam, Nicole F Steinmetz
Nucleic acid therapeutics have emerged as a powerful method for treatment of many diseases. However, the challenge lies in safe and efficient delivery of nucleic acids to their target site, as they need to cross various extracellular and intracellular barriers. Mammalian viruses have initially been favored for delivery of nucleic acid therapeutics, but safety concerns regarding their immunogenicity and potential of integration have fueled the search for alternative delivery strategies. For example, chemistry and bioengineering have led to advances in the use of nonviral vectors composed of lipids and other polymers; nevertheless, the synthetic systems often do not match the efficiency achieved using the biological systems...
July 18, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28713172/poxylation-as-an-alternative-stealth-coating-for-biomedical-applications
#2
Herdis Bludau, Anna E Czapar, Andrzej S Pitek, Sourabh Shukla, Rainer Jordan, Nicole F Steinmetz
Polyethylene glycol (PEG) polymers are currently used in a variety of medical formulations to reduce toxicity, minimize immune interactions and improve pharmacokinetics. Despite its widespread use however, the presence of anti-PEG antibodies indicates that this polymer has the potential to be immunogenic and antigenic. Here we present an alternative polymer, poly(2-oxazoline) (POx) for stealth applications, specifically shielding of a proteinaceous nanoparticle from recognition by the immune system. Tobacco mosaic virus (TMV) was used as our testbed due to its potential for use as a nanocarrier for drug delivery and molecular imaging applications...
March 2017: European Polymer Journal
https://www.readbyqxmd.com/read/28712562/abnormal-right-atrial-performance-in-repaired-tetralogy-of-fallot-a-cmr-feature-tracking-analysis
#3
Shelby Kutty, Quanliang Shang, Navya Joseph, Johannes T Kowallick, Andreas Schuster, Michael Steinmetz, David A Danford, Phillip Beerbaum, Samir Sarikouch
BACKGROUND: We hypothesized that right atrial (RA) performance is abnormal in repaired tetralogy of Fallot (TOF). METHODS: TOF patients were prospectively enrolled for cardiovascular magnetic resonance (CMR), echocardiography and exercise stress following a standardized 14-center protocol. Peak RA longitudinal strain (RALS) and right ventricular longitudinal strain (RVLS) were measured using CMR feature tracking (FT) and correlated to RA and RV end diastolic volumes (EDVi) and ejection fraction (EF)...
July 8, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28711277/use-of-a-midstream-clean-catch-mobile-application-did-not-lower-urine-contamination-rates-in-an-emergency-department
#4
Mary S Jacob, Paige Kulie, Cameron Benedict, Alexander J Ordoobadi, Neal Sikka, Erika Steinmetz, Melissa L McCarthy
OBJECTIVES: Urine microscopy is a common test performed in emergency departments (EDs). Urine specimens can easily become contaminated by different factors, including the collection method. The midstream clean-catch (MSCC) collection technique is commonly used to reduce urine contamination. The urine culture contamination rate from specimens collected in our ED is 30%. We developed an instructional application (app) to show ED patients how to provide a MSCC urine sample. We hypothesized that ED patients who viewed our instructional app would have significantly lower urine contamination rates compared to patients who did not...
July 8, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28709431/is-gentrification-all-bad-positive-association-between-gentrification-and-individual-s-perceived-neighborhood-collective-efficacy-in-montreal-canada
#5
Madeleine Steinmetz-Wood, Rania Wasfi, George Parker, Lisa Bornstein, Jean Caron, Yan Kestens
BACKGROUND: Collective efficacy has been associated with many health benefits at the neighborhood level. Therefore, understanding why some communities have greater collective efficacy than others is important from a public health perspective. This study examined the relationship between gentrification and collective efficacy, in Montreal Canada. METHODS: A gentrification index was created using tract level median household income, proportion of the population with a bachelor's degree, average rent, proportion of the population with low income, and proportion of the population aged 30-44...
July 14, 2017: International Journal of Health Geographics
https://www.readbyqxmd.com/read/28697950/sodium-levels-on-admission-are-associated-with-mortality-risk-in-hospitalized-patients
#6
Amit Akirov, Talia Diker-Cohen, Tali Steinmetz, Oren Amitai, Ilan Shimon
AIMS: Abnormal sodium values are common among hospitalized patients. We aimed to investigate the association of admission sodium values and mortality. METHODS: Historical prospectively data of adult patients hospitalized to medical wards between January 2011 and December 2013. Admission sodium values were classified to five categories: severe hyponatremia (<125mEq/L), mild hyponatremia (125-135mEq/L), normal sodium values (135-145mEq/L), mild hypernatremia (145-150mEq/L) and severe hypernatremia (>150mEq/L)...
July 8, 2017: European Journal of Internal Medicine
https://www.readbyqxmd.com/read/28694590/spinal-angiolipomas-a-puzzling-case-and-review-of-a-rare-entity
#7
REVIEW
Faris Shweikeh, Ajleeta Sangtani, Michael P Steinmetz, Peter Zahos, Bohdan Chopko
Patients with spinal epidural abscesses (SEAs) may have a variable presentation. Such an infection has a typical appearance on magnetic resonance imaging (MRI) and enhances with gadolinium. We present a case that was a diagnostic challenge where pre- and intra-operative findings resulted in conflicting impressions. The mimicker was a spinal angiolipoma (SAL). The authors then provide a thorough review of this rare spinal neoplasm. A 55-year-old man presented with back pain, paresis, paresthesia, and urinary retention...
April 2017: Journal of Craniovertebral Junction and Spine
https://www.readbyqxmd.com/read/28692568/superior-segment-facet-joint-violation-during-instrumented-lumbar-fusion-is-associated-with-higher-reoperation-rates-and-diminished-improvement-in-quality-of-life
#8
Jay M Levin, Vincent J Alentado, Andrew T Healy, Michael P Steinmetz, Edward C Benzel, Thomas E Mroz
STUDY DESIGN: A retrospective cohort study at a single tertiary care center. OBJECTIVE: To determine the impact of superior segment facet joint violation (FJV) during lumbar fusion on reoperation rates and quality of life (QOL). SUMMARY OF BACKGROUND DATA: Although lumbar fusion is an efficacious and durable treatment for numerous spinal pathologies, adjacent segment degeneration remains a serious complication. FJV has been suggested to alter load-bearing capability and potentially contribute to adjacent segment degeneration...
July 7, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28675044/delivery-of-chemotherapeutic-vcmmae-using-tobacco-mosaic-virus-nanoparticles
#9
Daniel L Kernan, Amy M Wen, Andrzej S Pitek, Nicole F Steinmetz
The first-line treatment for non-Hodgkin's lymphoma is chemotherapy. While generally well tolerated, off-target effects and chemotherapy-associated complications are still of concern. To overcome the challenges associated with systemic chemotherapy, we developed a biology-inspired, nanoparticle drug delivery system (nanoDDS) making use of the nucleoprotein components of the tobacco mosaic virus (TMV). Virus-based nanoparticles, including the high-aspect ratio soft nanorods formed by TMV, are growing in popularity as nanoDDS due to their simple genetic and chemical engineerability, size and shape tunability, and biocompatibility...
January 1, 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28659643/erratum-microtubule-minus-end-regulation-at-spindle-poles-by-an-aspm-katanin-complex
#10
Kai Jiang, Lenka Rezabkova, Shasha Hua, Qingyang Liu, Guido Capitani, A F Maarten Altelaar, Albert J R Heck, Richard A Kammerer, Michel O Steinmetz, Anna Akhmanova
This corrects the article DOI: 10.1038/ncb3511.
June 29, 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28658258/genome-scale-analysis-of-the-genes-that-contribute-to-burkholderia-pseudomallei-biofilm-formation-identifies-a-crucial-exopolysaccharide-biosynthesis-gene-cluster
#11
Grace I Borlee, Brooke A Plumley, Kevin H Martin, Nawarat Somprasong, Mihnea R Mangalea, M Nurul Islam, Mary N Burtnick, Paul J Brett, Ivo Steinmetz, David P AuCoin, John T Belisle, Dean C Crick, Herbert P Schweizer, Bradley R Borlee
Burkholderia pseudomallei, the causative agent of melioidosis, is an important public health threat due to limited therapeutic options for treatment. Efforts to improve therapeutics for B. pseudomallei infections are dependent on the need to understand the role of B. pseudomallei biofilm formation and its contribution to antibiotic tolerance and persistence as these are bacterial traits that prevent effective therapy. In order to reveal the genes that regulate and/or contribute to B. pseudomallei 1026b biofilm formation, we screened a sequence defined two-allele transposon library and identified 118 transposon insertion mutants that were deficient in biofilm formation...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28653379/only-one-small-sin-how-self-construal-affects-self-control
#12
Janina Steinmetz, Thomas Mussweiler
Past research has shown that self-construal can influence self-control by reducing interdependent people's impulsivity in the presence of peers. We broaden these findings by examining the hypothesis that an interdependent (vs. independent) self-construal fosters self-control even in the absence of peers and for non-impulsive decisions. We further explore whether this effect could be mediated by the more interrelated (vs. isolated) processing style of interdependent (vs. independent) people. Such an interrelated (vs...
June 26, 2017: British Journal of Social Psychology
https://www.readbyqxmd.com/read/28651997/endovascular-treatment-of-asymptomatic-abdominal-aortic-aneurysms-in-octogenarians-factors-influencing-long-term-survival
#13
Valentin Crespy, Lucie Salomon du Mont, Adrien Kaladji, Michel Bartoli, Yann Gouëffic, Nicolas Abello, Pierre-Edouard Magnan, Alain Cardon, Philippe Chaillou, Eric Steinmetz
Beyond the age of 80 years, the preventive treatment of an asymptomatic abdominal aortic aneurysm (AAA) has to be decided in light of the life expectancy which it is difficult to evaluate, but it is important to determine who in this population will benefit from it. The objective of our study was to determine the factors influencing short-term mortality and long term survival of patients aged 80 and older after the endovascular treatment of AAAs (EVAR). MATERIAL AND METHODS: We present a retrospective analysis of the prospective databases of four French academic departments of vascular surgery, bringing together the data of all the patients presenting an AAA who were treated by EVAR between 1998 and 2011...
June 23, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28650644/combination-of-plant-virus-nanoparticle-based-in-situ-vaccination-with-chemotherapy-potentiates-antitumor-response
#14
Karin L Lee, Abner A Murray, Duc H T Le, Mee Rie Sheen, Sourabh Shukla, Ulrich Commandeur, Steven Fiering, Nicole F Steinmetz
Immunotherapeutics are gaining more traction in the armamentarium used to combat cancer. Specifically, in situ vaccination strategies have gained interest because of their ability to alter the tumor microenvironment to an antitumor state. Herein, we investigate whether flexuous plant virus-based nanoparticles formed by the potato virus X (PVX) can be used as an immunotherapeutic for in situ vaccine monotherapy. We further developed dual chemo-immunotherapeutics by incorporating doxorubicin (DOX) into PVX yielding a dual-functional nanoparticle (PVX-DOX) or by coadministration of the two therapeutic regimes, PVX immunotherapy and DOX chemotherapy (PVX+DOX)...
June 26, 2017: Nano Letters
https://www.readbyqxmd.com/read/28649484/enhancing-the-angular-sensitivity-of-plasmonic-sensors-using-hyperbolic-metamaterials
#15
Kandammathe Valiyaveedu Sreekanth, Yunus Alapan, Mohamed ElKabbash, Amy M Wen, Efe Ilker, Michael Hinczewski, Umut A Gurkan, Nicole F Steinmetz, Giuseppe Strangi
Surface plasmon resonance (SPR) sensors operate mainly on prism and grating coupling techniques, with spectral and angular scans being the two major interrogation schemes. Among them, the angular scan technique has several advantages including higher measurement precision owing to its higher signal-to-noise ratio. The currently available SPR sensor arrangements provide a maximum angular sensitivity of 500°-600° per RIU. Here, we report the study of grating coupled-hyperbolic metamaterial (GC-HMM) sensors with high angular sensitivity...
November 2016: Advanced Optical Materials
https://www.readbyqxmd.com/read/28647638/evolution-of-practices-in-carotid-surgery-observational-study-in-france-from-2006-to-2015
#16
Lucie Salomon du Mont, Stefan Olteanu, Eric Steinmetz, Benjamin Kretz
INTRODUCTION: The principal objective of this study was to determine the evolution of the surgical management of stenosis of the carotid bifurcation over a period of 10 years in France. The secondary objective was to ascertain the impact of recommendations and of the literature on the evolution of these practices. MATERIALS AND METHODS: From the registry of the 'Agence Technique de l'Information sur l'Hospitalisation (ATIH)', we collected all of the data for carotid surgery procedures carried out in French healthcare establishments between 2006 and 2015...
June 21, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28647539/chemical-addressability-of-potato-virus-x-for-its-applications-in-bio-nanotechnology
#17
Duc H T Le, He Hu, Ulrich Commandeur, Nicole F Steinmetz
Potato virus X (PVX), a type member of the plant virus potexvirus group, offers a unique nanotechnology platform based on its high aspect ratio and flexible filamentous shape. The PVX platform has already been engineered and studied for its uses in imaging, drug delivery, and immunotherapies. While genetic engineering procedures are well established for PVX, there is limited information about chemical conjugation strategies for functionalizing PVX, partly due to the lack of structural information of PVX at high resolution...
June 21, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28640209/quinolin-6-yloxyacetamides-are-microtubule-destabilizing-agents-that-bind-to-the-colchicine-site-of-tubulin
#18
Ashwani Sharma, Gonzalo Sáez-Calvo, Natacha Olieric, Francisco de Asís Balaguer, Isabel Barasoain, Clemens Lamberth, J Fernando Díaz, Michel O Steinmetz
Quinolin-6-yloxyacetamides (QAs) are a chemical class of tubulin polymerization inhibitors that were initially identified as fungicides. Here, we report that QAs are potent anti-proliferative agents against human cancer cells including ones that are drug-resistant. QAs act by disrupting the microtubule cytoskeleton and by causing severe mitotic defects. We further demonstrate that QAs inhibit tubulin polymerization in vitro. The high resolution crystal structure of the tubulin-QA complex revealed that QAs bind to the colchicine site on tubulin, which is targeted by microtubule-destabilizing agents such as colchicine and nocodazole...
June 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28635146/the-effect-of-ct-scanners-in-the-trauma-room-an-observational-study
#19
S Wulffeld, L S Rasmussen, B Højlund Bech, J Steinmetz
BACKGROUND: A CT scanner incorporated in the trauma resuscitation bay may benefit trauma patients by fastening work-up times; however, evidence in the area is still sparse. We assessed if time from admission to first CT scan was lower after incorporation of a CT scanner in the resuscitation bay. METHODS: We included trauma patients admitted in two 1-year periods, before and after a major rebuilding of the trauma room. Beforehand, one CT scanner was located in an adjacent room...
August 2017: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/28628332/watson-crick-base-pair-radical-cation-as-a-model-for-oxidative-damage-in-dna
#20
Linda Feketeová, Bun Chan, George N Khairallah, Vincent Steinmetz, Philippe Maitre, Leo Radom, Richard A J O'Hair
The deleterious cellular effects of ionizing radiation are well-known, but the mechanisms causing DNA damage are poorly understood. The accepted molecular events involve initial oxidation and deprotonation at guanine sites, triggering hydrogen atom abstraction reactions from the sugar moieties, causing DNA strand breaks. Probing the chemistry of the initially formed radical cation has been challenging. Here, we generate, spectroscopically characterize, and examine the reactivity of the Watson-Crick nucleobase pair radical cation in the gas phase...
June 27, 2017: Journal of Physical Chemistry Letters
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