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https://www.readbyqxmd.com/read/29342353/synthesis-and-computational-studies-demonstrate-the-utility-of-an-intramolecular-styryl-diels-alder-reaction-and-bht-assisted-1-3-shift-to-construct-anticancer-dl-deoxypodophyllotoxin
#1
Diana I Saavedra, Benjamin D Rencher, Doo-Hyun Kwon, Stacey J Smith, Daniel H Ess, Merritt B Andrus
Deoxypodophyllotoxin is a secondary metabolite lignan possessing potent anticancer activity with potential as a precursor for known anticancer drugs, but its use is limited by scarcity from natural sources. We here report the total synthesis of racemic deoxypodophyllotoxin (DPT) in seven steps using an intramolecular styryl Diels-Alder reaction (ISDA) strategy uniquely suited to assemble the deoxypodophyllotoxin core. Computational studies are also reported for this reaction that demonstrate the ability to overcome the limitations of slow reactivity and electronic mismatch of the diene and dieneophile...
January 17, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29341373/antibiotic-allergy-labels-the-impact-of-taking-a-clinical-history
#2
Adrienne Torda, Victor Chan
BACKGROUND: Many patients admitted to hospital have an antibiotic allergy (AAL) documented in their medical record. In many of these, the reaction is not a hypersensitivity reaction or may no longer be relevant. Despite this, the label adversely affects patient care directly in terms of antibiotic selection, and indirectly in terms of patient costs and the development of antimicrobial resistance. AIMS: To estimate the prevalence of AALs in a cohort of hospitalised patients, to investigate the feasibility of de-labelling through re-challenge based solely upon clinical grounds...
January 17, 2018: International Journal of Clinical Practice
https://www.readbyqxmd.com/read/29340076/mitochondrial-ros-activates-erk-autophagy-pathway-as-a-protected-mechanism-against-deoxypodophyllotoxin-induced-apoptosis
#3
Sang-Hun Kim, Kwang-Youn Kim, Sul-Gi Park, Sun-Nyoung Yu, Young-Wook Kim, Hyo-Won Nam, Hyun-Hee An, Young-Woo Kim, Soon-Cheol Ahn
Deoxypodophyllotoxin (DPT) is a naturally occurring flavolignan isolated from Anthriscus sylvestris. Recently, it has been reported that DPT inhibits tubulin polymerization and induces G2/M cell cycle arrest followed by apoptosis through multiple cellular processes. Despite these findings, details regarding the cellular and molecular mechanisms underlying the DPT-mediated cell death have been poorly understood. To define a mechanism of DPT-mediated cell death response, we examined whether DPT activates signaling pathways for autophagy and apoptosis...
December 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29339128/anxiety-and-depression-effects-during-drug-provocation-test
#4
Laura Michelina Losappio, Alessandra Cappai, Alessandra Arcolaci, Iuliana Badiu, Patrizia Bonadonna, Elisa Boni, Claudia Bussolino, Marco Caminati, Pietro Galati, Enrico Heffler, Rossella Intravaia, Marina Mauro, Ilaria Massaro, Antonino Romano, Gabriele Rumi, Anna Parolo, Stefano Pizzimenti, Michele Nichelatti, Elide Anna Pastorello
BACKGROUND: Drug provocation test (DPT) represents the gold standard for the diagnosis of drug allergy. A DPT can be performed in a single-blind placebo-controlled manner. In anxiety and depressive disorders, patients need to be evaluated to understand the nature of placebo reactions. OBJECTIVE: The aim of this study was to evaluate the psychological profile of patients with reactions to placebo during a DPT. METHODS: We consecutively enrolled patients with suspected drug allergy undergoing a DPT preceded by the administration of the placebo...
January 12, 2018: Journal of Allergy and Clinical Immunology in Practice
https://www.readbyqxmd.com/read/29339127/the-basophil-activation-test-can-be-of-value-for-diagnosing-immediate-allergic-reactions-to%C3%A2-omeprazole
#5
Jose J Laguna, Gador Bogas, Maria Salas, Cristobalina Mayorga, Javier Dionicio, Rosario Gonzalez-Mendiola, Adriana Ariza, Ruben Fernández-Santamaría, Isabel Olazabal, Inmaculada Doña, Tahia D Fernandez, Maria J Torres
BACKGROUND: Proton pump inhibitors (PPIs) are commonly used to treat gastrointestinal diseases. Incidence of hypersensitivity reactions to PPIs has risen, likely because of increased consumption. Their diagnosis is difficult, with skin tests (STs) presenting low sensitivity, making it necessary to perform drug provocation tests (DPTs). The value of in vitro tests for the diagnosis of immediate reaction to PPI is unclear. OBJECTIVE: To analyze the diagnostic value of the basophil activation test (BAT) in a group of patients diagnosed with immediate allergy to omeprazole...
January 12, 2018: Journal of Allergy and Clinical Immunology in Practice
https://www.readbyqxmd.com/read/29327281/effect-of-early-natal-supplementation-of-paracetamol-on-attenuation-of-exotoxin-endotoxin-induced-pyrexia-and-precipitation-of-autistic-like-features-in-albino-rats
#6
Abdulaziz S Saeedan, Indu Singh, Mohd Nazam Ansari, Manjari Singh, Jitendra K Rawat, Uma Devi, Swetlana Gautam, Rajnish K Yadav, Gaurav Kaithwas
The present study was aimed to test the hypothesis that paracetamol (PCM) can precipitate autistic like features when used to counteract vaccine-induced fever using experimental rat pups. The pups were treated with measles mumps rubella (MMR) vaccine, diphtheria tetanus and pertussis (DPT) vaccines and lipopolysaccharide (LPS) with subsequent PCM treatment. The pups were evaluated for postnatal growth (weight gain, eye opening) and behavior alterations (swimming performance, olfactory discrimination, negative geotaxis, nociception, and locomotor activity) by performing battery of neurobehavioral test...
January 11, 2018: Inflammopharmacology
https://www.readbyqxmd.com/read/29273072/monitoring-adherence-to-guidelines-of-antibiotic-use-in-pediatric-pneumonia-the-marea-study
#7
Pasquale Di Pietro, Ornella Della Casa Alberighi, Michela Silvestri, Maria Angela Tosca, Anna Ruocco, Giorgio Conforti, Giovanni A Rossi, Elio Castagnola, Maria Caterina Merlano, Simona Zappettini, Salvatore Renna
BACKGROUND: Children are the most vulnerable population exposed to the use of antibiotics often incorrectly prescribed for the treatment of infections really due to viruses rather than to bacteria. We designed the MAREA study which consisted of two different studies: i) a surveillance study to monitor the safety/efficacy of the antibiotics for the treatment of pneumonia (CAP), pharyngotonsillitis and acute otitis media in children younger than 14 yrs old, living in Liguria, North-West Italy and ii) a pre-/post-interventional study to evaluate the appropriateness of antibiotic prescription for the treatment these infections...
December 22, 2017: Italian Journal of Pediatrics
https://www.readbyqxmd.com/read/29243549/how-primary-care-reforms-influenced-health-indicators-in-manisa-district-in-turkey-lessons-for-general-practitioners
#8
Celalettin Cevik, Kaan Sozmen, Bulent Kilic
BACKGROUND: Turkish health reforms began in 2003 and brought some significant changes in primary care services. Few studies in Turkey compare the shift from health centres (HC) to family physicians (FP) approach, which was initiated by reforms. OBJECTIVES: This study compares health status indicators during the HC period before reforms (2003-2007) and the FP period after reforms (2008-2012) in Turkey. METHODS: This study encompasses time series data consisting of the results of a 10-year assessment (2003-2012) in Manisa district...
December 15, 2017: European Journal of General Practice
https://www.readbyqxmd.com/read/29242886/solvent-effect-on-the-intermolecular-proton-transfer-of-the-watson-and-crick-guanine-cytosine-and-adenine-thymine-base-pairs-a-polarizable-continuum-model-study
#9
Eduardo E Romero, Florencio E Hernandez
Herein we present our results on the study of the double proton transfer (DPT) mechanism in the adenine-thymine (AT) and guanine-cytosine (GC) base pairs, both in gas phase and in solution. The latter was modeled using the polarizable continuum method (PCM) in different solvents. According to our DFT calculations, the DPT may occur for both complexes in a stepwise mechanism in condensate phase. In gas phase only the GC base pair exhibits a concerted DPT mechanism. Using the Wigner's tunneling corrections to the transition state theory we demonstrate that such corrections are important for the prediction of the rate constants of both systems in gas and in condensate phase...
December 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29236212/post-operative-refractive-prediction-error-after-phacovitrectomy-a-retrospective-study
#10
Gijsbert J Hötte, Daniël P de Bruyn, Joeri de Hoog
INTRODUCTION: Many authors have reported on a myopic post-operative refractive prediction error when combining phacoemulsification with pars plana vitrectomy (phacovitrectomy). In this study we evaluate the amount of this error in our facility and try to elucidate the various factors involved. METHODS: This was a retrospective study which included 140 patients who underwent phacovitrectomy (39 with macular holes, 88 with puckers, and 13 with floaters). Post-operative refractive error was defined as the difference between the actual spherical equivalent (SEQ) and expected SEQ based on the SRK/T and Holladay-II formulas...
December 13, 2017: Ophthalmology and Therapy
https://www.readbyqxmd.com/read/29223821/germination-physiological-and-biochemical-responses-of-acacia-seedlings-acacia-raddiana-and-acacia-tortilis-to-petroleum-contaminated-soils
#11
Thanh Hoai Tran, Einav Mayzlish Gati, Amram Eshel, Gidon Winters
Along the arid Arava, southern Israel, acacia trees (Acacia raddiana and Acacia tortilis) are considered keystone species. Yet they are threatened by the ongoing aquifer depletion for agriculture, the conversion of natural land to agricultural land, seed infestation by bruchid beetles, and the reduction in precipitation level in the region. In the acacia dominated Evrona reserve (southern Arava), adding to these threats are recurrent oil spills from an underground pipeline. We report here a study of the effects of contaminated soils, from a recent (December 2014) and a much older (1975) oil spills...
December 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29202162/controversial-issues-in-healthcare-policy-a-survey-of-doctor-of-physical-therapy-students-in-a-public-university
#12
Drew D Snyder, Teale K Bennett, Jeremy C Oller, Weiqing Ge
BACKGROUND: The recently passed legislation and proposed policy changes governing the healthcare system have been met with extensive debate and controversy. OBJECTIVE: The primary objective of the study was to determine the attitudes of Doctor of Physical Therapy (DPT) students towards some of these controversial issues. The secondary objective was to determine the demographic factors, including number of years in a physical therapy program, that contribute to their attitude formation...
2017: Journal of Allied Health
https://www.readbyqxmd.com/read/29194613/comparison-of-vegetable-shortening-and-cocoa-butter-as-vehicles-for-cortisol-manipulation-in-salmo-trutta
#13
K Birnie-Gauvin, K S Peiman, M H Larsen, K Aarestrup, K M Gilmour, S J Cooke
This study demonstrates that vegetable shortening and cocoa butter are two effective vehicles for intraperitoneal cortisol implants in juvenile teleosts, specifically brown trout Salmo trutta, residing in north temperate freshwater environments. Each vehicle showed a different pattern of cortisol elevation. Vegetable shortening was found to be a more suitable vehicle for long-term cortisol elevation [elevated at 3, 6 and 9 days post treatment (dpt)], while cocoa butter may be better suited for short-term cortisol elevation (only elevated at 3 dpt)...
November 30, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/29185754/defects-cause-sub-gap-luminescence-from-a-crystalline-tetracene-derivative
#14
R Eric McAnally, Jon A Bender, Laura Estergreen, Ralf Haiges, Stephen E Bradforth, Jahan M Dawlaty, Sean T Roberts, Aaron S Rury
We use steady-state and ultrafast nonlinear spectroscopies in combination with density functional theory calculations to explain light emission below the optical gap energy (E0) of crystalline samples of 5,12-diphenyl tetracene (DPT). In particular, the properties of vibrational coherences imprinted on a probe pulse transmitted through a DPT single crystal indicate discrete electronic transitions below E0 of this organic semiconductor. Analysis of coherence spectra lead us to propose structural defect states give rise to these discrete transitions and sub-gap light emission...
November 29, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29175371/natural-history-of-benign-nonimmediate-allergy-to-beta-lactams-in-children-a-prospective-study-in-retreated-patients-after-a-positive-and-a-negative-provocation-test
#15
Aude Tonson la Tour, Marine Michelet, Philippe A Eigenmann, Jean-Christoph Caubet
BACKGROUND: The drug provocation test (DPT) is considered as the gold standard to diagnose drug allergy and is particularly important in the diagnosis of nonimmediate beta-lactam (BL) allergy in children. The natural history of BL allergy remains unknown. OBJECTIVE: Our main aim was to evaluate the natural history of nonimmediate BL hypersensitivity and the long-term tolerance acquisition, and our secondary objective was to determine the negative predictive value (NPV) of the DPT following a 2-day protocol...
November 23, 2017: Journal of Allergy and Clinical Immunology in Practice
https://www.readbyqxmd.com/read/29171129/the-influence-of-body-mass-index-and-age-on-c-peptide-at-the-diagnosis-of-type-1-diabetes-in-children-who-participated-in-the-diabetes-prevention-trial-type-1
#16
Jay M Sosenko, Susan Geyer, Jay S Skyler, Lisa E Rafkin, Heba M Ismail, Ingrid M Libman, Yuk-Fun Liu, Linda A DiMeglio, Carmella Evans-Molina, Jerry P Palmer
BACKGROUND/OBJECTIVE: The extent of influence of BMI and age on C-peptide at the diagnosis of type 1 diabetes (T1D) is unknown. We thus studied the impact of body mass index Z-scores (BMIZ) and age on C-peptide measures at and soon after the diagnosis of T1D. METHODS: Data from Diabetes Prevention Trial-Type 1 (DPT-1) participants <18.0 years at diagnosis was analyzed. Analyses examined associations of C-peptide measures with BMIZ and age in 2 cohorts: oral glucose tolerance tests (OGTTs) at diagnosis (n = 99) and mixed meal tolerance tests (MMTTs) <6 months after diagnosis (n = 80)...
November 24, 2017: Pediatric Diabetes
https://www.readbyqxmd.com/read/29166890/continuous-passive-motion-and-physical-therapy-cpm-versus-physical-therapy-pt-versus-delayed-physical-therapy-dpt-after-surgical-release-for-elbow-contractures-a-study-protocol-for-a-prospective-randomized-controlled-trial
#17
Jetske Viveen, Job N Doornberg, Izaak F Kodde, Pjotr Goossens, Koen L M Koenraadt, Bertram The, Denise Eygendaal
BACKGROUND: The elbow is prone to stiffness after trauma. To regain functional elbow motion several conservative- and surgical treatment options are available. Conservative treatment includes physical therapy, intra-articular injections with corticosteroids and a static progressive or dynamic splinting program. If conservative treatment fails, an operative release of the posttraumatic stiff elbow is often performed. The best Evidence-Based rehabilitation protocol for patients after an operative release is unknown to date and differs per surgeon, hospital and country...
November 22, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29146755/ocular-findings-in-loeys-dietz-syndrome
#18
Catharina Busch, Robert Voitl, Barbara Goergen, Tomasz Zemojtel, Petra Gehle, Daniel J Salchow
BACKGROUND: Loeys-Dietz syndrome (LDS), an autosomal-dominant connective tissue disorder, is characterised by systemic manifestations including arterial aneurysm and craniofacial dysmorphologies. Although ocular involvement in LDS has been reported, detailed information on those manifestations is lacking. METHODS: Retrospective chart review of patients with diagnosed LDS and comparison with age-matched control patients. RESULTS: Mean age was 37...
November 16, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29133981/electrostatic-interactions-between-polyglutamic-acid-and-polylysine-yields-stable-polyion-complex-micelles-for-deoxypodophyllotoxin-delivery
#19
Yutong Wang, Liping Huang, Yan Shen, Lidan Tang, Runing Sun, Di Shi, Thomas J Webster, Jiasheng Tu, Chunmeng Sun
To achieve enhanced physical stability of poly(ethylene glycol)-poly(d,l-lactide) polymeric micelles (PEG-PDLLA PMs), a mixture of methoxy PEG-PDLLA-polyglutamate (mPEG-PDLLA-PLG) and mPEG-PDLLA-poly(l-lysine) (mPEG-PDLLA-PLL) copolymers was applied to self-assembled stable micelles with polyion-stabilized cores. Prior to micelle preparation, the synthetic copolymers were characterized by (1)H-nuclear magnetic resonance (NMR) and infrared spectroscopy (IR), and their molecular weights were calculated by (1)H-NMR and gel permeation chromatography (GPC)...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29119183/the-influence-of-thiolate-ligands-on-the-luminescence-properties-of-cycloplatinated-ii-complexes
#20
Mahboubeh Jamshidi, Mojgan Babaghasabha, Hamid R Shahsavari, S Masoud Nabavizadeh
Complexes [Pt(C(^)N)(PPh3)Cl] (C(^)N = bzq (7,8-benzoquinolinyl, A) and ppy (2-phenylpyridinyl, B)) were reacted with various thiolate ligands to afford complexes [Pt(C(^)N)(PPh3)(κ(1)-S-SR)], C(^)N = bzq, R = SPh (thiophenolate, 1a); C(^)N = ppy, R = SPh (1b); C(^)N = bzq, R = Spy (pyridine-2-thiolate, 2a); C(^)N = ppy, R = Spy (2b); C(^)N = bzq, R = SpyN (pyrimidine-2-thiolate, 3a); C(^)N = ppy, R = SpyN (3b). Complexes 1-3 were characterized by NMR spectroscopy, and the solid-state structures of 1a and 2a were determined by X-ray diffraction methods...
November 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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