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https://www.readbyqxmd.com/read/28822272/b24n24-fullerene-as-a-carrier-for-5-fluorouracil-anti-cancer-drug-delivery-dft-studies
#1
Mehrnoosh Khodam Hazrati, Zahra Javanshir, Zargham Bagheri
It has been previously indicated that BN nanostructures may be nontoxic and biocompatible. Here the potential application of a B24N24 is explored as a drug delivery system for anti-cancer 5-fluorouracil based on the density functional theory. This drug prefers to attach via its oxygen atoms to the B atoms of the cluster with adsorption energy about -11.90kcalmol(-1) based on the dispersion corrected B3LYP level of theory. To make the cluster more appropriate for drug delivery, we replaced a B atom by Si or Al atom to improve the interaction strength...
August 9, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28820966/reactive-oxygen-species-responsive-polymeric-nanoparticles-for-alleviating-sepsis-induced-acute-liver-injury-in-mice
#2
Gan Chen, Hongzhang Deng, Xiang Song, Mingzi Lu, Lian Zhao, Sha Xia, Guoxing You, Jingxiang Zhao, Yulong Zhang, Anjie Dong, Hong Zhou
Sepsis-associated acute liver injury contributes to the pathogenesis of multiple organ dysfunction syndrome and is associated with increased mortality. Currently, no specific therapeutics for sepsis-associated liver injury are available. With excess levels of reactive oxygen species (ROS) being implicated as key players in sepsis-induced liver injury, we hypothesize that ROS-responsive nanoparticles (NPs) formed via the self-assembly of diblock copolymers of poly(ethylene glycol) (PEG) and poly(propylene sulfide) (PPS) may function as an effective drug delivery system for alleviating sepsis-induced liver injury by preferentially releasing drug molecules at the disease site...
August 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/28820580/enhanced-fluorescence-emission-and-singlet-oxygen-generation-of-photosensitizers-embedded-in-injectable-hydrogels-for-imaging-guided-photodynamic-cancer-therapy
#3
Liu-Yuan Xia, Xiaodong Zhang, Meng Cao, Zhan Chen, Fu-Gen Wu
Benefiting from their inherent localized and controlled release properties, hydrogels are ideal delivery systems for therapeutic drugs or nanoparticles. In particular, the applications of hydrogels for the delivery and release of photo-responsive drugs or nanoparticles are receiving increasing attention. However, the effect of the hydrogel matrix on the fluorescence emission and singlet oxygen generation efficiency of the embedded photosensitizers (PSs) has not been clarified. Herein, meso-tetrakis (1-methylpyridinium-4-yl) porphyrin (TMPyP) as a water-soluble PS is encapsulated into an injectable hydrogel formed by glycol chitosan and dibenzaldehyde-terminated telechelic poly(ethylene glycol)...
August 18, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28819055/temperature-effects-on-the-cardiorespiratory-control-of-american-bullfrog-tadpoles-based-on-a-non-invasive-methodology
#4
Leonardo S Longhini, Lucas A Zena, Glauber S F da Silva, Kênia C Bícego, Luciane H Gargaglioni
Temperature effects on cardiac autonomic tonus in amphibian larval stages have never been investigated. Therefore, we evaluated the effect of different temperatures (15°C, 25°C, and 30°C) on the cardiorespiratory rates and cardiac autonomic tonus of premetamorphic bullfrog tadpoles, Lithobates catesbeianus To this end, a non-invasive method was developed to permit measurements of electrocardiogram (ECG) and buccal movements (fB ; surface electromyography of the buccal floor). For evaluation of autonomic regulation, intraperitoneal injections of Ringer's solution (control), atropine (cholinergic muscarinic antagonist), and sotalol (β-adrenergic antagonist) were performed...
August 17, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28816883/cerebral-oxygen-saturation-during-electroconvulsive-therapy-a-secondary-analysis-of-a-randomized-crossover-trial
#5
Kamath Sriganesh, Tanmay Jadhav, Sudhir Venkataramaiah, Channaveerachari Naveen Kumar, Shyamsundar Armugham, Mariamma Philip, K R Madhusudan Reddy, Jagadisha Thirthalli, G S Umamaheswara Rao
BACKGROUND: Electroconvulsive therapy (ECT) causes acute changes in cerebral perfusion and oxygenation. Near-infrared spectroscopy is a novel, noninvasive technique to assess cerebral oxygen saturation (cSO2). We hypothesized that cSO2 increases during ECT and more so with atropine premedication and decreases when systemic desaturation (peripheral oxygen saturation <90%) occurs during ECT. METHODS: We performed a secondary analysis of a randomized trial of patients undergoing ECT for psychiatric illness during a 6-month period...
August 14, 2017: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/28816029/development-of-a-3d-tissue-lung-phantom-of-a-preterm-infant-for-optical-measurements-of-oxygen-laser-detector-position-considerations
#6
Jim Larsson, Peilang Liao, Patrik Lundin, Emilie Krite Svanberg, Johannes Swartling, Märta Lewander Xu, Joakim Bood, Stefan Andersson-Engels
There is a need for further improving the clinical care of our most vulnerable patients - preterm infants. Novel diagnostic and treatment tools facilitate such advances. Here we are evaluating a potential percutaneous optical monitoring tool to assess the oxygen and water vapor contents in the lungs of preterm babies. The aim is to prepare for further clinical studies by gaining detailed understanding of how the measured light intensity and gas absorption signal behave for different possible geometries of the light delivery and receiver...
August 16, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28810532/plga-ctab-curcumin-nanoparticles-fabrication-characterization-and-molecular-basis-of-anticancer-activity-in-triple-negative-breast-cancer-cell-lines-mda-mb-231-cells
#7
Ramovatar Meena, Sumit Kumar, Raj Kumar, Usha Singh Gaharwar, Paulraj Rajamani
Triple-negative breast cancers (TNBC) are aggressive cancers, which do not control by hormonal therapy or therapies that target HER-2 receptors. Curcumin (Cur) has shown cytotoxic effects in multiple cancer cell lines. However, its medical uses remain limited due to low aqueous solubility and poor bioavailability. Therefore, present study was aimed to fabricate the small positive charge curcumin nanoparticles (CN) by nanoprecipitation methods using PLGA and CTAB, and to evaluate its anticancer efficacy and underlying the mechanism in triple negative breast cancer cell lines (MDA-MB-231 cells)...
August 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28809883/noninvasive-measurement-of-tissue-blood-oxygenation-with-cerenkov-imaging-during-therapeutic-radiation-delivery
#8
Xiaofeng Zhang, Sai Kit Lam, Gregory Palmer, Shiva Das, Mark Oldham, Mark Dewhirst
Tumor tissue oxygenation significantly affects the outcome of radiotherapy. Real-time monitoring of tumor hypoxia is highly desirable for effective radiotherapy, and is the basis for improved treatment because hypoxic tumor cells are more resistant to radiation damage than fully oxygenated cells. We propose to use Cerenkov imaging to monitor tumor hypoxia by means of tissue blood oxygenation without the need for any exogenous contrast agent. Using a rodent hypoxia model, we demonstrate that Cerenkov imaging can be used as a noninvasive and noncontact method to measure tissue blood oxygenation level during radiation delivery...
August 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28806683/asymmetric-polyplex-nanocapsules-loaded-with-photosentisizer-for-light-assisted-gene-transfer
#9
Xuemin Lu, Li Liu
Inefficient intracellular gene delivery is still a limitation for the clinical translation of gene therapy. Recently, photochemical internalization (PCI) has emerged with the opportunity to overcome endo-lysosomal sequestration in gene delivery, which utilizes photosensitizer (PS) plus light generating reactive oxygen species (ROS) at sub-lethal level to facilitate intracellularly targeted drug delivery. In this work, asymmetric polyplex-nanocapsules were prepared based on the triblock copolymers of PEG-PCL-PEI by using the simple solvent-injection method...
August 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28806581/engineered-systems-for-therapeutic-angiogenesis
#10
REVIEW
Shane Browne, Abhay Pandit
Ischemic disease caused by insufficient blood supply leads to a lack of oxygen and nutrients and a build-up of waste products in the affected tissue. Therapeutic angiogenesis, as a means to enhance perfusion of tissues with an inadequate blood supply, holds great promise for the treatment of ischemic disease. A wide range of factors that play a key role in physiological angiogenesis have been identified and trialed as pro-angiogenic agents. However, as yet pro-angiogenic treatments have failed to be translated clinically, owing to both lack of efficacy and safety concerns regarding the use of doses considerably larger than is typical present under physiological conditions...
August 11, 2017: Current Opinion in Pharmacology
https://www.readbyqxmd.com/read/28806492/evaluation-of-gastric-and-bladder-tonometry-as-indicators-of-tissue-perfusion-in-induced-hypotension-in-dogs
#11
Juan Morgaz, Lidia Espigares-Rodríguez, Pilar Muñoz-Rascón, Rocío Navarrete, Jose Andrés Fernández-Sarmiento, María Del Mar Granados Machuca
OBJECTIVE: To evaluate the use of gastric (PgCO2 ) and bladder (PbCO2 ) tonometry for assessing tissue hypoperfusion in dogs during sevoflurane-induced hypotension, and to compare these measurements with delivery of oxygen, arterial oxygen content, and plasma lactate concentration. DESIGN: Prospective experimental trial. SETTING: University veterinary teaching hospital. ANIMALS: Fourteen adult Beagle dogs. INTERVENTIONS: Anesthetic induction was performed by mask with sevoflurane and oxygen...
August 14, 2017: Journal of Veterinary Emergency and Critical Care
https://www.readbyqxmd.com/read/28806055/selective-release-system-for-antioxidative-and-anti-inflammatory-activities-using-h2o2-responsive-therapeutic-nanoparticles
#12
A Young Kim, Ji Hoon Ha, Soo Nam Park
We developed nanoparticles that were degraded by H2O2, a reactive oxygen species (ROS), to study a drug delivery system that targets damaged skin cells with oxidative stress and inflammation. In this study, tyrosol-incorporated copolyoxalate (TPOX) was synthesized by using 1,4-cyclohexanedimethanol, 4-(2-hydroxyethyl)phenol (tyrosol) and oxalyl chloride (Mw ~8835 Da). In vitro drug release behavior was assessed by loading nile red, a lipophilic fluorescent material such as quercetin, into the TPOX nanoparticles...
August 14, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28803519/a-case-report-of-benzocaine-induced-methemoglobinemia
#13
Chaundra R Sewell, Michael P Rivey
Methemoglobinemia is a serious medical condition characterized by the disrupted binding of oxygen to iron on hemoglobin, with a consequent impaired oxygen delivery to body tissues. Various drugs including the local anesthetics such as benzocaine can cause acquired methemoglobinemia. The reported case describes methemoglobinemia that occurred in association with the use of topical benzocaine spray and lozenges in a previously healthy 51-year-old female who had undergone colon surgery to remove a bleeding polyp...
January 1, 2017: Journal of Pharmacy Practice
https://www.readbyqxmd.com/read/28798199/human-cerebral-blood-flow-control-during-hypoxia-focus-on-chronic-pulmonary-obstructive-disease-copd-and-obstructive-sleep-apnea-osa
#14
Andrew E Beaudin, Sara E Hartmann, Matiram Pun, Marc J Poulin
The brain is a vital organ that relies on a constant and adequate blood flow to match oxygen and glucose delivery with the local metabolic demands of active neurons. Thus, exquisite regulation of cerebral blood flow (CBF) is particularly important under hypoxic conditions to prevent a detrimental decrease in the partial pressure of oxygen within the brain tissues. Cerebrovascular sensitivity to hypoxia, assessed as the change in CBF during a hypoxic challenge, represents the capacity of cerebral vessels to respond to, and compensate for, a reduced oxygen supply, and has been shown to be impaired or blunted in a number of conditions...
August 10, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28797964/enhancing-biodegradation-of-c16-alkyl-quaternary-ammonium-compounds-using-an-oxygen-based-membrane-biofilm-reactor
#15
YenJung Sean Lai, Aura Ontiveros-Valencia, Zehra Esra Ilhan, Yun Zhou, Evelyn Miranda, Juan Maldonado, Rosa Krajmalnik-Brown, Bruce E Rittmann
Quaternary ammonium compounds (QACs) (e.g., hexadecyltrimethyl-ammonium bromide, CTAB) are emerging contaminants with widespread use as surfactants and disinfectants. Because the initial step of QAC biodegradation is mono-oxygenation, QAC degraders require O2, but normal aeration leads to serious foaming. Here, we developed and tested an oxygen-based membrane biofilm reactor (O2-MBfR) that delivers O2 by diffusion through the walls of hollow-membranes to a biofilm accumulating on the outer surface of membranes...
July 2, 2017: Water Research
https://www.readbyqxmd.com/read/28796690/human-metapneumovirus-infection-and-acute-respiratory-distress-syndrome-during-pregnancy
#16
Alina Fuchs, Rodney McLaren, Paul Saunders, Scarlett Karakash, Howard Minkoff
BACKGROUND: Human metapneumovirus has recently been recognized as an important cause of severe respiratory viral infections and of viral infections in patients admitted to intensive care units. Little is known about the course of this infection in pregnancy. CASE: A late-preterm primigravid woman was admitted to the intensive care unit for acute respiratory distress syndrome and subsequently diagnosed with human metapneumovirus. Because of worsening maternal respiratory status, she was intubated and a primary cesarean delivery was performed...
August 4, 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28794990/photoacoustic-based-so2-estimation-through-excised-bovine-prostate-tissue-with-interstitial-light-delivery
#17
Trevor Mitcham, Houra Taghavi, James Long, Cayla Wood, David Fuentes, Wolfgang Stefan, John Ward, Richard Bouchard
Photoacoustic (PA) imaging is capable of probing blood oxygen saturation (sO2), which has been shown to correlate with tissue hypoxia, a promising cancer biomarker. However, wavelength-dependent local fluence changes can compromise sO2 estimation accuracy in tissue. This work investigates using PA imaging with interstitial irradiation and local fluence correction to assess precision and accuracy of sO2 estimation of blood samples through ex vivo bovine prostate tissue ranging from 14% to 100% sO2. Study results for bovine blood samples at distances up to 20 mm from the irradiation source show that local fluence correction improved average sO2 estimation error from 16...
September 2017: Photoacoustics
https://www.readbyqxmd.com/read/28794144/nasal-high-flow-therapy-a-novel-treatment-rather-than-a-more-expensive-oxygen-device
#18
REVIEW
Eleni Ischaki, Ioannis Pantazopoulos, Spyros Zakynthinos
Nasal high flow is a promising novel oxygen delivery device, whose mechanisms of action offer some beneficial effects over conventional oxygen systems. The administration of a high flow of heated and humidified gas mixture promotes higher and more stable inspiratory oxygen fraction values, decreases anatomical dead space and generates a positive airway pressure that can reduce the work of breathing and enhance patient comfort and tolerance. Nasal high flow has been used as a prophylactic tool or as a treatment device mostly in patients with acute hypoxaemic respiratory failure, with the majority of studies showing positive results...
September 30, 2017: European Respiratory Review: An Official Journal of the European Respiratory Society
https://www.readbyqxmd.com/read/28792628/a-review-of-international-clinical-practice-guidelines-for-the-use-of-oxygen-in-the-delivery-room-resuscitation-of-preterm-infants
#19
A Wilson, M Vento, P Shah, O Saugstad, N Finer, W Rich, R Morton, Y Rabi, W Tarnow-Mordi, K Suzuki, I M Wright, J Oei
AIM: To collate and assess international clinical practice guidelines (CPG) to determine current recommendations guiding oxygen management for respiratory stablisation of preterm infants at delivery. METHODS: A search of public databases using the terms "clinical practice guidelines", "preterm", "oxygen" and "resuscitation" was made and complemented by direct query to consensus groups, resuscitation expert committees and clinicians. Data were extracted to include the three criteria for assessment: country of origin, gestation and initial FiO2 and target SpO2 for the first 10 minutes of life...
August 9, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28790808/copd-patients-self-reported-adherence-psychosocial-factors-and-mild-cognitive-impairment-in-pulmonary-rehabilitation
#20
Antonia Pierobon, Elisa Sini Bottelli, Laura Ranzini, Claudio Bruschi, Roberto Maestri, Giorgio Bertolotti, Marinella Sommaruga, Valeria Torlaschi, Simona Callegari, Anna Giardini
In addition to clinical comorbidities, psychological and neuropsychological problems are frequent in COPD and may affect pulmonary rehabilitation delivery and outcome. The aims of the study were to describe a COPD population in a rehabilitative setting as regards the patients depressive symptoms, anxiety, mild cognitive impairment (MCI) and self-reported adherence and to analyze their relationships; to compare the COPD sample MCI scores with normative data; and to investigate which factors might predict adherence to prescribed physical exercise...
2017: International Journal of Chronic Obstructive Pulmonary Disease
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