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https://www.readbyqxmd.com/read/29458114/severity-dependent-influence-of-isocapnic-hypoxia-on-reaction-time-is-independent-of-neurovascular-coupling
#1
Hannah G Caldwell, Geoff B Coombs, Michael M Tymko, Daniela Nowak-Flück, Philip N Ainslie
With exposure to acute normobaric hypoxia, global cerebral oxygen delivery is maintained via increases in cerebral blood flow (CBF); therefore, regional and localized changes in oxygen tension may explain neurocognitive impairment. Neurovascular coupling (NVC) is the close temporal and regional relationship of CBF to changes in neural activity and may aid in explaining the localized CBF response with cognitive activation. High-altitude related cognitive impairment is likely affected by hypocapnic cerebral vasoconstriction that may influence regional CBF regulation independent of hypoxia...
February 16, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29457643/performing-under-pressure-hypertension-and-the-regulation-of-cerebral-oxygen-delivery
#2
Ryan L Hoiland
Reductions in arterial oxygen content (CaO2 ) elicit increases in cerebral blood flow (CBF) that are adequate to maintain convective delivery of oxygen to the brain in healthy humans (i.e. cerebral oxygen delivery, CDO2 ). This article is protected by copyright. All rights reserved.
February 19, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29457449/catalytically-active-single-chain-polymeric-nanoparticles-exploring-their-functions-in-complex-biological-media
#3
Yiliu Liu, Silvia Pujals, Patrick J M Stals, Thomas Pauloehrl, Stanislav I Presolski, E W Meijer, Lorenzo Albertazzi, Anja R A Palmans
Dynamic single-chain polymeric nanoparticles (SCPNs) are intriguing, bioinspired architectures that result from the collapse or folding of an individual polymer chain into a nanometer-sized particle. Here we present a detailed biophysical study on the behavior of dynamic SCPNs in living cells and an evaluation of their catalytic functionality in such a complex medium. We first developed a number of delivery strategies that allowed the selective localization of SCPNs in different cellular compartments. Live/dead tests showed that the SCPNs were not toxic to cells while spectral imaging revealed that SCPNs provide a structural shielding and reduced the influence from the outer biological media...
February 19, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29457113/pulmonary-embolism-caused-by-ovarian-vein-thrombosis-during-cesarean-section-a-case-report
#4
Yutaka Oda, Michie Fujita, Chika Motohisa, Shinichi Nakata, Motoko Shimada, Ryushi Komatsu
Background: Ovarian vein thrombosis is a rare complication of pregnancy. The representative complaints of patients with ovarian vein thrombosis are abdominal pain and fever. In some cases, however, fatal pulmonary embolism may develop. We report a case of pulmonary embolism presenting with severe hypotension and loss of consciousness during cesarean section possibly caused by ovarian vein thrombosis. Case presentation: A 25-year-old woman at 38 weeks 4 days of gestation was scheduled for repeat cesarean section...
2018: JA Clin Rep
https://www.readbyqxmd.com/read/29456246/mitochondrial-dysfunction-in-diabetic-kidney-disease
#5
REVIEW
Josephine M Forbes, David R Thorburn
Globally, diabetes is the leading cause of chronic kidney disease and end-stage renal disease, which are major risk factors for cardiovascular disease and death. Despite this burden, the factors that precipitate the development and progression of diabetic kidney disease (DKD) remain to be fully elucidated. Mitochondrial dysfunction is associated with kidney disease in nondiabetic contexts, and increasing evidence suggests that dysfunctional renal mitochondria are pathological mediators of DKD. These complex organelles have a broad range of functions, including the generation of ATP...
February 19, 2018: Nature Reviews. Nephrology
https://www.readbyqxmd.com/read/29455984/hyaluronate-coating-enhances-the-delivery-and-biocompatibility-of-gold-nanoparticles
#6
Bedia Begum Karakocak, Jue Liang, Pratim Biswas, Nathan Ravi
For targeted delivery with nanoparticles (NPs) as drug carriers, it is imperative that the NPs are internalized into the targeted cell. Surface properties of NPs influence their interactions with cells. We examined the responses of retinal pigment epithelial cells, NIH 3T3 fibroblast cells, and Chinese hamster ovary cells to gold nanoparticles (Au NPs) in their nascent form as well as coated with end-thiolated hyaluronate (HS-HA). The grafting density of HS-HA on Au NPs was calculated based on total organic carbon measurements and thermal gravimetric analysis...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29455519/a-self-targeting-dual-ros-ph-responsive-apoferritin-nanocage-for-spatiotemporally-controlled-drug-delivery-to-breast-cancer
#7
Bin Du, Shaona Jia, Qinghui Wang, Xiaoyu Ding, Ying Liu, Hanchun Yao, Jie Zhou
In this study, an intelligent pH and ROS dual-responsive drug delivery system based on apoferritin (AFt) nanocage was prepared. This therapeutic system can specifically self-targeting to 4T1 breast cancer cells by exploiting L-apoferritin receptor SCARA 5, avoiding the nonspecific binding or aggregation of nanoparticles due to the chemical functionalization for targeting. The characteristics of AFt were utilized for the simultaneous delivery of anticancer drug doxorubicin (DOX) and photosensitizer rose bengal (RB)...
February 17, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29455070/oral-engineered-bifidobacterium-longum-expressing-rhmnsod-to-suppress-experimental-colitis
#8
Mengge Liu, Shiyu Li, Qian Zhang, Zhenrui Xu, Jiajia Wang, Hanxiao Sun
In recent years, using genetic engineering and bioengineering techniques, Bifidobacterium as a carrier to express specific functions of the protein or polypeptide, has become a new treatment for disease. Ulcerative colitis (UC) is a type of inflammatory bowel diseases (IBD). Although the cause of this inflammatory disorder is still unknown, a large amount of evidence suggests that ulcerative colitis is associated with increased activity of reactive oxygen species (ROS), manganese superoxide dismutase (MnSOD) is a kind of superoxide dismutase (SOD) has been demonstrated to play a key role in the pathophysiology of colitis...
February 14, 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29454381/human-cerebrovascular-function-in-health-and-disease-insights-from-integrative-approaches
#9
REVIEW
Erin D Ozturk, Can Ozan Tan
BACKGROUND: The marked increase in the size of the brain, and consequently, in neural processing capability, throughout human evolution is the basis of the higher cognitive function in humans. However, greater neural, and thus information processing capability, comes at a significant metabolic cost; despite its relatively small size, the modern human brain consumes almost a quarter of the glucose and oxygen supply in the human body. Fortunately, several vascular mechanisms ensure sufficient delivery of glucose and oxygen to the active neural tissue (neurovascular coupling), prompt removal of neural metabolic by-products (cerebral vasoreactivity), and constant global blood supply despite daily variations in perfusion pressure (cerebral autoregulation)...
February 17, 2018: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/29453921/changes-in-erythrocyte-deformability-during-day-and-possible-role-of-melatonin
#10
Rastislav Vazan, Katarina Plauterova, Gabriela Porubska, Jana Radosinska
OBJECTIVES: The deformability of erythrocytes is their ability to change shape in order to pass through the capillaries. Th is is necessary for quality of microcirculation and sufficient delivery of oxygen to the tissues. Th e aim of our study was to investigate the possible spontaneous changes in the erythrocyte deformability during day and evaluation of the possible direct effects of melatonin (hormone involved in regulation of biorhythms) on the erythrocyte deformability. METHODS: Samples of capillary blood were taken from 12 healthy volunteers in the morning (8:00) and early in the evening (16:30)...
January 1, 2018: Endocrine Regulations
https://www.readbyqxmd.com/read/29453383/hyperbaric-oxygen-therapy-is-well-tolerated-and-effective-for-ulcerative-colitis-patients-hospitalized-for-moderate-severe-flares-a-phase-2a-pilot-multi-center-randomized-double-blind-sham-controlled-trial
#11
Parambir S Dulai, Jay C Buckey, Laura E Raffals, Jason M Swoger, Paul L Claus, Kevin O'Toole, Judy A Ptak, Michael W Gleeson, Christella E Widjaja, John T Chang, Jeffery M Adler, Nihal Patel, Laurie A Skinner, Shawn P Haren, Kimberly Goldby-Reffner, Kimberly D Thompson, Corey A Siegel
BACKGROUND: Hyperbaric oxygen therapy (HBOT) markedly increases tissue oxygen delivery. Case series suggest it may have a potential therapeutic benefit in ulcerative colitis (UC). We investigated the therapeutic potential of HBOT as an adjunct to steroids for UC flares requiring hospitalization. METHODS: The study was terminated early due to poor recruitment with 18 of the planned 70 patients enrolled. UC patients hospitalized for moderate-severe flares (Mayo score ≥6, endoscopic sub-score ≥2) were block randomized to steroids + daily HBOT (n = 10) or steroids + daily sham hyperbaric air (n = 8)...
February 16, 2018: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/29452948/photo-tearable-tape-close-wrapped-upconversion-nanocapsules-for-near-infrared-modulated-efficient-sirna-delivery-and-therapy
#12
Yue Zhang, Kewei Ren, Xiaobo Zhang, Zhicong Chao, Yuqin Yang, Deju Ye, Zhihui Dai, Ying Liu, Huangxian Ju
RNA interference (RNAi) has become an appealing therapeutic approach for cancer and other diseases. One key challenge is the effective protection of these small fragile biomolecules against complicated physiological environments as well as efficient on-demand release. Here we design a photo-tearable polymer tape close-wrapped nanocapsule for efficient NIR modulated siRNA delivery. The photo-tearable nanocapsules comprise core-shell upconversion nanoparticles (UCNPs) coated with mesoporous silica layer for loading of photosensitizer hypocrellin A (HA) and small interfering RNA (siRNA) against polo-like kinase 1 (PLK1), and covalently bound thin membranes of polyethylene glycol (PEG) via a synthesized photocleavable linker (PhL)...
February 9, 2018: Biomaterials
https://www.readbyqxmd.com/read/29451844/pulmonary-delivery-of-therapeutic-and-diagnostic-gases
#13
Warren M Zapol, H Cecil Charles, Andrew R Martin, Rui C Sá, Binglan Yu, Fumito Ichinose, Neil MacIntyre, Joseph Mammarappallil, Richard Moon, John Z Chen, Eric T Geier, Chantal Darquenne, G Kim Prisk, Ira Katz
The 21st Congress for the International Society for Aerosols in Medicine included, for the first time, a session on Pulmonary Delivery of Therapeutic and Diagnostic Gases. The rationale for such a session within ISAM is that the pulmonary delivery of gaseous drugs in many cases targets the same therapeutic areas as aerosol drug delivery, and is in many scientific and technical aspects similar to aerosol drug delivery. This article serves as a report on the recent ISAM congress session providing a synopsis of each of the presentations...
February 16, 2018: Journal of Aerosol Medicine and Pulmonary Drug Delivery
https://www.readbyqxmd.com/read/29451568/upconversion-in-photodynamic-therapy-plumbing-the-depths
#14
Michael R Hamblin
Photodynamic therapy (PDT) involves the combination of non-toxic dyes called photosensitizers (PS) and harmless visible light that interact with ambient oxygen to give reactive oxygen species (ROS) that can damage biomolecules and kill cells. PDT has mostly been developed as a cancer therapy but can also be used as an antimicrobial approach against localized infections. However even the longest wavelength used for exciting PS (in the 700 nm region) has relatively poor tissue penetration, and many PS are much better excited by blue and green light...
February 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29450594/position-paper-for-the-organization-of-ecmo-programs-for-cardiac-failure-in-adults
#15
Darryl Abrams, A Reshad Garan, Akram Abdelbary, Matthew Bacchetta, Robert H Bartlett, James Beck, Jan Belohlavek, Yih-Sharng Chen, Eddy Fan, Niall D Ferguson, Jo-Anne Fowles, John Fraser, Michelle Gong, Ibrahim F Hassan, Carol Hodgson, Xiaotong Hou, Katarzyna Hryniewicz, Shingo Ichiba, William A Jakobleff, Roberto Lorusso, Graeme MacLaren, Shay McGuinness, Thomas Mueller, Pauline K Park, Giles Peek, Vin Pellegrino, Susanna Price, Erika B Rosenzweig, Tetsuya Sakamoto, Leonardo Salazar, Matthieu Schmidt, Arthur S Slutsky, Christian Spaulding, Hiroo Takayama, Koji Takeda, Alain Vuylsteke, Alain Combes, Daniel Brodie
Extracorporeal membrane oxygenation (ECMO) has been used increasingly for both respiratory and cardiac failure in adult patients. Indications for ECMO use in cardiac failure include severe refractory cardiogenic shock, refractory ventricular arrhythmia, active cardiopulmonary resuscitation for cardiac arrest, and acute or decompensated right heart failure. Evidence is emerging to guide the use of this therapy for some of these indications, but there remains a need for additional evidence to guide best practices...
February 15, 2018: Intensive Care Medicine
https://www.readbyqxmd.com/read/29449656/ultrasound-beam-steering-of-oxygen-nanobubbles-for-enhanced-bladder-cancer-therapy
#16
Pushpak Bhandari, Gloriia Novikova, Craig J Goergen, Joseph Irudayaraj
New intravesical treatment approaches for bladder cancer are needed as currently approved treatments show several side effects and high tumor recurrence rate. Our study used MB49 murine urothelial carcinoma model to evaluate oxygen encapsulated cellulosic nanobubbles as a novel agent for imaging and ultrasound guided drug delivery. In this study, we show that oxygen nanobubbles (ONB) can be propelled (up to 40 mm/s) and precisely guided in vivo to the tumor by an ultrasound beam. Nanobubble velocity can be controlled by altering the power of the ultrasound Doppler beam, while nanobubble direction can be adjusted to different desired angles by altering the angle of the beam...
February 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29448898/a-membrane-aerated-biofilm-reactor-mabr-for-sulfide-control-from-anaerobically-treated-wastewater
#17
Priscila Rosseto Camiloti, Freddy Valdés, Tiago Palladino Delforno, Jan Bartacek, Marcelo Zaiat, David Jeison
A UASB (upflow anaerobic sludge blanket) reactor was operated combined to a membrane aerated biofilm reactor (MABR) for sulfate removal and for elemental sulfur reclamation. A commercial silicon tube was used as an oxygen delivery diffuser. The process achieved high rates of sulfide removal from the liquid phase (90 %). The hydrogen sulfide removal was influenced by the pH value and at pH value of 7.5, 98 % of the H 2 S was removed. The elemental sulfur was observed inside the membrane, with content in the biomass of 21 %...
February 16, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29448866/multifunctional-mesoporous-silica-nanoparticles-as-efficient-transporters-of-doxorubicin-and-chlorin-e6-for-chemo-photodynamic-combinatorial-cancer-therapy
#18
Jing-Hua Sun, Wei Zhang, Dong-Yang Zhang, Jianliang Shen, Cai-Ping Tan, Liang-Nian Ji, Zong-Wan Mao
A multimodal nanocarrier based on mesoporous silica nanoparticles (MSNs) is developed to co-delivery photosensitizer chlorin e6 (Ce6) and chemotherapeutic agent doxorubicin (Dox) for cancer combination therapy. Ce6 was covalently conjugated with mesoporous silica nanoparticles, which could increase the loading efficiency, and allowed for photodynamic therapy. Doxorubicin was loaded into the pores of mesoporous silica nanoparticles to afford the dual drug delivery system Dox@MSNs-Ce6. These hybrid nanoparticles have an average diameter of about 100 nm and slightly negative charge of about -17 mV...
January 1, 2018: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29448545/enhanced-photosensing-and-photodynamic-treatment-of-colon-cancer-cells-using-methoxy-poly-ethylene-glycol-conjugated-chlorin-e6
#19
Je Ho Ryu, Young-Il Jeong, Hyun Yul Kim, Gyung Mo Son, Hye Lim Lee, Chung-Wook Chung, Chong Woo Chu, Dae Hwan Kang
Nanophotosensitizer composed of methoxy poly(ethylene glycol) (MePEG) and chlorin e6 (Ce6) (abbreviated as Pe6) was synthesized for efficient delivery of Ce6 to the colon cancer cells. Pe6 nanophotosensitizer has small diameter less than 100 nm with spherical shape and core-shell structure. They were activated in aqueous solution while Ce6 was quenched due to its poor aqueous solubility. They showed no intrinsic cytotoxicity against normal cells and colon cancer cells. Pe6 nanophotosensitizers showed enhanced cellular uptake, phototoxicity, and reactive oxygen species (ROS) generation at in vitro cell culture experiment...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448035/nanomedicines-and-gene-therapy-for-the-delivery-of-growth-factors-to-improve-perfusion-and-oxygenation-in-wound-healing
#20
Céline M Desmet, Véronique Préat, Bernard Gallez
Oxygen plays a key role in wound healing, and hypoxia is a major cause of wound healing impairment; therefore, treatments to improve hemodynamics and increase wound oxygenation are of particular interest for the treatment of chronic wounds. This article describes the roles of oxygen and angiogenesis in wound healing as well as the tools used to evaluate tissue oxygenation and perfusion and then presents a review of nanomedicines and gene therapies designed to improve perfusion and oxygenation and accelerate wound healing...
February 12, 2018: Advanced Drug Delivery Reviews
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