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https://www.readbyqxmd.com/read/28718887/operative-learning-curve-trajectory-in-a-cohort-of-surgical-trainees
#1
C Brown, T Abdelrahman, N Patel, C Thomas, M J Pollitt, W G Lewis
BACKGROUND: Certification of completion of training in general surgery in the UK requires demonstration of competence in index operations by means of three level 4 competence consultant-validated procedure-based assessments (PBAs). The aim of this study was to evaluate the trajectory of operative learning curves related to PBA performance levels for curriculum-defined indicative operations with respect to numbers performed and training time. METHODS: Logbook data from consecutive higher general surgical trainees were compared with PBA evaluations to determine the relationship between PBA performance level, operative experience, training time and indicative numbers...
July 18, 2017: British Journal of Surgery
https://www.readbyqxmd.com/read/28712870/tissue-factor-pathway-inhibitor-attenuates-er-stress-induced-inflammation-in-human-m2-polarized-macrophages
#2
Sandra Espada, Benedicte Stavik, Sverre Holm, Ellen Lund Sagen, Vigdis Bjerkeli, Mona Skjelland, Tuva B Dahl, Terje Espevik, Sandip Kanse, Per Morten Sandset, Grethe Skretting, Bente Halvorsen
Endoplasmic reticulum (ER) stress has been shown to play a key role during the initiation and clinical progression of the cardiovascular diseases, such as atherosclerosis. We have recently shown that expression of tissue factor pathway inhibitor (TFPI) in human monocyte-derived macrophages (MDMs) was induced by cholesterol crystals (CC). In the present study we aimed to determine the role of TFPI under ER stress conditions using human MDMs. qRT-PCR and immunohistochemistry analysis were performed to determine the presence of the ER stress marker CCAAT/enhancer binding protein homologous protein (CHOP) and TFPI in a human carotid plaque material and also in human MDMs polarized into pro-inflammatory M1 or anti-inflammatory M2 populations...
July 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28681934/3-4-dihydroxybenzalacetone-and-caffeic-acid-phenethyl-ester-induce-preconditioning-er-stress-and-autophagy-in-sh-sy5y-cells
#3
Ryoichi Tomiyama, Ken Takakura, Shouhei Takatou, Thuong Manh Le, Takumi Nishiuchi, Yutaka Nakamura, Tetsuya Konishi, Seiichi Matsugo, Osamu Hori
3,4-dihydroxybenzalacetone (DBL) and Caffeic acid phenethyl ester (CAPE) are both catechol-containing phenylpropanoid derivatives with diverse bioactivities. In the present study, we analyzed the ability of these compounds to activate the unfolded protein response (UPR) and the oxidative stress response. When human SH-SY5Y neuroblastoma cells were treated with DBL or CAPE, the expression of endoplasmic reticulum (ER) stress-related genes such as HSPA5, HYOU1, DDIT3, and SEC61b increased to a larger extent in response to CAPE treatment, while that of antioxidant genes such as HMOX1, GCLM, and NQO1 increased to a larger extent in response to DBL treatment...
July 6, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28674464/assessment-of-critical-steps-of-a-gc-ms-based-indirect-analytical-method-for-the-determination-of-fatty-acid-esters-of-monochloropropanediols-mcpdes-and-of-glycidol-ges
#4
Zuzana Zelinkova, Anupam Giri, Thomas Wenzl
Fatty acid esters of 2- and 3-chloropropanediol (MCPDEs) and fatty acid esters of glycidol (GEs) are commonly monitored in edible fats and oils. A recommendation issued by the European Commission emphasizes the need of generating data on the occurrence of these substances in a broad range of different foods. So far, analytical methods for the determination of MCPDEs and GEs are fully validated only for oils, fats and margarine. This manuscript presents the assessment of critical steps in the AOCS Cd 29a-13 method for the simultaneous determination of MCPDEs and GEs in the fat phase obtained from bakery and potato products, smoked and fried fish and meat, and other cereal products...
July 2017: Food Control
https://www.readbyqxmd.com/read/28674030/s-nitrosoglutathione-reductase-gsnor-deficiency-confers-improved-survival-and-neurological-outcome-in-experimental-cerebral-malaria
#5
Robyn E Elphinstone, Rickvinder Besla, Eric A Shikatani, Ziyue Lu, Alfred Hausladen, Matthew Davies, Clinton S Robbins, Mansoor Husain, Jonathan S Stamler, Kevin C Kain
Artesunate remains the mainstay of treatment for cerebral malaria, but is less effective in later stages of disease when the host inflammatory response and blood brain barrier integrity dictate clinical outcomes. Nitric oxide (NO) is an important regulator of inflammation and microvascular integrity, and impaired NO bioactivity is associated with fatal outcomes in malaria. Endogenous NO bioactivity in mammals is largely mediated by S-nitrosothiols (SNOs). Based on these observations, we hypothesized that animals deficient in the SNO-metabolizing enzyme, S-nitrosoglutathione (GSNO) reductase (GSNOR), which exhibit enhanced S-nitrosylation, would have improved outcomes in a preclinical model of cerebral malaria...
July 3, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28672279/%C3%AE-elemene-regulates-endoplasmic-reticulum-stress-to-induce-the-apoptosis-of-nsclc-cells-through-perk-ire1%C3%AE-atf6-pathway
#6
Ying Liu, Zi-Yu Jiang, Yuan-Li Zhou, Hui-Hui Qiu, Gang Wang, Yi Luo, Jing-Bing Liu, Xiong-Wei Liu, Wei-Quan Bu, Jie Song, Li Cui, Xiao-Bin Jia, Liang Feng
Endoplasmic reticulum stress (ERs) has been regarded as an important cause for the pathogenesis of non-small-cell lung cancer (NSCLC). β-elemene is an active component in the essential oil extracted from a medicinal herb, Curcuma wenyujin, and has been reported to be effective against non-small-cell lung cancer (NSCLC). However, the potential effect and underlying mechanisms of β-elemene on regulating ERs to inhibit NSCLC are still unclear. In the present study, A549 cells and Lewis tumor-bearing C57BL/6J mice were established to evaluate this effect...
June 30, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28668332/ethanol-induced-pge2-up-regulates-a%C3%AE-production-through-pka-creb-signaling-pathway
#7
Amr Ahmed Gabr, Hyun Jik Lee, Xaykham Onphachanh, Young Hyun Jung, Jun Sung Kim, Chang Woo Chae, Ho Jae Han
Ethanol abuse aggravates dementia-associated cognitive defects through the progression of Alzheimer's disease (AD) pathophysiology. Beta-site APP-cleaving enzyme 1 (BACE1) has been considered as a key regulator of AD pathogenesis by controlling amyloid beta peptide (Aβ) accumulation. In addition, previous studies reported that endoplasmic reticulum (ER) stress and neuroinflammation have been proposed in ethanol-induced neurodegeneration. Thus, we investigated the role of ER stress and PGE2, a neuroinflammation mediator, in the ethanol-stimulated BACE1 expression and Aβ production...
June 28, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28665610/activation-of-sodium-storage-sites-in-prussian-blue-analogues-via-surface-etching
#8
Wenhao Ren, Mingsheng Qin, Zixuan Zhu, Mengyu Yan, Qi Li, Lei Zhang, Dongna Liu, Liqiang Mai
Sodium-ion battery (SIB) technologies are known to suffer from kinetic problems associated with the solid-state diffusion of Na(+) in intercalation electrodes, which results in suppressed specific capacity and degraded rate performance. Here, a controllable selective etching approach is developed for the synthesis of Prussian blue analogue (PBA) with enhanced sodium storage activity. Based on time-dependent experiments, a defect-induced morphological evolution mechanism from nanocube to nanoflower structure is proposed...
June 30, 2017: Nano Letters
https://www.readbyqxmd.com/read/28655725/chemical-chaperone-4-phenyl-butyric-acid-4pba-reduces-hepatocellular-lipid-accumulation-and-lipotoxicity-through-induction-of-autophagy
#9
Ashraf U Nissar, Love Sharma, Malik A Mudasir, Lone A Nazir, Sheikh A Umar, Parduman R Sharma, Ram A Vishwakarma, Sheikh A Tasduq
Defective autophagy has been linked to lipotoxicity in several cellular models. We aimed to investigate autophagy in lipid stimulated hepatoma (Huh7) cells and tested whether 4-Phenyl butyric acid (4PBA), a chemical chaperone, has a beneficial role in hepatic fat accumulation and lipotoxicity. We report that long-term (24h) exposure of hepatocytes to palmitate block autophagic flux that leads to lipid accumulation and cell death. Western blotting analysis showed increased accumulation of SQSTM1/P62, decreased expression of Beclin1 and Atg7 in palmitate-treated cells...
June 27, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28644032/receptor-and-microenvironment-dual-recognizable-nanogel-for-targeted-chemotherapy-of-highly-metastatic-malignancy
#10
Jinjin Chen, Jianxun Ding, Weiguo Xu, Tianmeng Sun, Haihua Xiao, Xiuli Zhuang, Xuesi Chen
Targeted delivery of chemotherapeutic drugs to the desired lesion sites is the main objective in malignancy treatment, especially in highly metastatic malignancies. However, extensive studies around the world on traditional targeting strategies of recognizing either overexpressed receptors or microenvironments in tumors show great limitations, owing to the off-target effect and tumor homogeneity. Integration of both receptor-mediated targeting (RMT) and environment-mediated targeting (EMT) enhances the tumor accumulation and subsequent cell uptake at the same time, which may avoid these limitations...
June 26, 2017: Nano Letters
https://www.readbyqxmd.com/read/28643406/prussian-blue-nanocubes-with-an-open-framework-structure-coated-with-pedot-as-high-capacity-cathodes-for-lithium-sulfur-batteries
#11
Dawei Su, Michael Cortie, Hongbo Fan, Guoxiu Wang
It is shown that Prussian blue analogues (PBAs) can be a very competitive sulfur host for lithium-sulfur (Li-S) batteries. Sulfur stored in the large interstitial sites of a PBA host can take advantage of reversible and efficient insertion/extraction of both Li(+) and electrons, due to the well-trapped mobile dielectron redox centers in the well-defined host. It is demonstrated that Na2 Fe[Fe(CN)6 ] has a large open framework, and as a cathode, it both stores sulfur and acts as a polysulfide diffusion inhibitor based on the Lewis acid-base bonding effect...
June 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28630443/chemical-chaperone-tudca-unlike-pba-mitigates-protein-aggregation-efficiently-and-resists-er-and-non-er-stress-induced-hepg2-cell-death
#12
Jagadeesh Kumar Uppala, Amina R Gani, Kolluru V A Ramaiah
Stress induced BSA (bovine serum albumin) protein aggregation is effectively mitigated in vitro by TUDCA (tauroursodeoxycholic acid) than by PBA (4- phenylbutyric acid), chemical chaperones approved by FDA for the treatment of biliary cirrhosis and urea cycle disorders respectively. TUDCA, unlike PBA, enhances trypsin mediated digestion of BSA. TUDCA activates PERK, an ER-resident kinase that phosphorylates the alpha-subunit of eukaryotic initiation factor2 (eIF2α) and promotes the expression of activated transcription factor 4 (ATF4) in HepG2 cells...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28622016/endoplasmic-reticulum-stress-is-involved-in-nucleus-pulposus-degeneration-and-attenuates-low-ph-induced-apoptosis-of-rat-nucleus-pulposus-cells
#13
Zhi-Yang Xie, Lu Chen, Feng Wang, Lei Liu, Cong Zhang, Kun Wang, Feng Cai, Arjun Sinkemanni, Xin Hong, Xiao-Tao Wu
The microenvironment of degenerative intervertebral disk (IVD) is characteristic of a high concentration of lactic acid and low pH levels, whereas the underlying mechanism has not been clearly defined. Endoplasmic reticulum (ER) is the hub of interactions between environmental signals and cellular biological functions, the malfunction of which is closely involved in the pathogenesis of multiple disorders, including IVD degeneration (IVDD). This research mainly aims at exploring what role ER stress plays in the natural process of IVDD and pH-induced apoptosis of rat nucleus pulposus (NP) cells (NPCs)...
June 16, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/28610689/experimental-assessment-of-proton-dose-calculation-accuracy-in-inhomogeneous-media
#14
J Sorriaux, M Testa, H Paganetti, J Orban de Xivry, J A Lee, E Traneus, K Souris, S Vynckier, E Sterpin
PURPOSE: Proton therapy with Pencil Beam Scanning (PBS) has the potential to improve radiotherapy treatments. Unfortunately, its promises are jeopardized by the sensitivity of the dose distributions to uncertainties, including dose calculation accuracy in inhomogeneous media. Monte Carlo dose engines (MC) are expected to handle heterogeneities better than analytical algorithms like the pencil-beam convolution algorithm (PBA). In this study, an experimental phantom has been devised to maximize the effect of heterogeneities and to quantify the capability of several dose engines (MC and PBA) to handle these...
June 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28606465/ubiquitin-proteasome-system-and-er-stress-in-the-retina-of-diabetic-rats
#15
Karnam Shruthi, Singareddy Sreenivasa Reddy, Geereddy Bhanuprakash Reddy
PURPOSE: Diabetic retinopathy (DR) is the most frequently occurring complication of diabetes. Alterations in ubiquitin-proteasome system (UPS) have been associated with several degenerative disorders. Hence, in this study, we investigated the status and role of UPS and ER stress in the retina of diabetic rats. METHODS: Diabetes was induced in rats by streptozotocin. Retinal markers, ER stress markers, components of UPS, ERAD, and autophagy were analyzed after 2- and 4-months of diabetes...
August 1, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28602580/a-comparison-of-outcomes-in-patients-with-infrapopliteal-disease-randomised-to-vein-bypass-or-plain-balloon-angioplasty-in-the-bypass-vs-angioplasty-in-severe-ischaemia-of-the-leg-basil-trial
#16
M A Popplewell, H O B Davies, J Narayanswami, M Renton, A Sharp, G Bate, S Patel, J Deeks, A W Bradbury
OBJECTIVE: The aim was to compare outcomes in a subgroup of patients with infrapopliteal (IP) disease randomised to infrapopliteal vein bypass (VB) or plain balloon angioplasty (PBA) in the original BASIL trial. METHODS: A comparison of outcomes from patients randomised to VB or PBA undergoing revascularisation for severe limb ischaemia (SLI) because of IP disease with or without femoropopliteal disease. Data were extracted from case report forms from the BASIL trial...
June 8, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28594326/er-retention-is-imposed-by-copii-protein-sorting-and-attenuated-by-4-phenylbutyrate
#17
Wenfu Ma, Elena Goldberg, Jonathan Goldberg
Native cargo proteins exit the endoplasmic reticulum (ER) in COPII-coated vesicles, whereas resident and misfolded proteins are substantially excluded from vesicles by a retention mechanism that remains unresolved. We probed the ER retention process using the proteostasis regulator 4-phenylbutyrate (4-PBA), which we show targets COPII protein to reduce the stringency of retention. 4-PBA competes with p24 proteins to bind COPII. When p24 protein uptake is blocked, COPII vesicles package resident proteins and an ER-trapped mutant LDL receptor...
June 8, 2017: ELife
https://www.readbyqxmd.com/read/28572273/laughter-crying-and-sadness-in-als
#18
Nimish J Thakore, Erik P Pioro
BACKGROUND: Pseudobulbar affect (PBA) is prevalent in amyotrophic lateral sclerosis (ALS), but there is limited information on its associations and course. OBJECTIVES: Explore prevalence, associations, course and manifestations of PBA in outpatient cohort of patients with ALS and examine its relationship to depression. METHODS: Self-reported measures of PBA and depression (Center for Neurologic Study-Lability Scale (CNS-LS) and Patient Health Questionnaire (PHQ-9), respectively) were obtained from consecutive patients with ALS using tablet devices in waiting rooms (Knowledge Program)...
June 1, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28570041/prussian-blue-analogue-with-fast-kinetics-through-electronic-coupling-for-sodium-ion-batteries
#19
Ping Nie, Jiaren Yuan, Jie Wang, Zaiyuan Le, Guiyin Xu, Liang Hao, Gang Pang, Yuting Wu, Hui Dou, Xiaohong Yan, Xiaogang Zhang
Alternative battery systems based on the chemistry of sodium are being considered to offer sustainability and cost-effectiveness. Herein, a simple and new method is demonstrated to enable nickel hexacyanoferrate (NiHCF) Prussian blue analogues (PBA) nanocrystals to be an excellent host for sodium ion storage by functionalization with redox guest molecule. The method is achieved by using NiHCF PBA powders infiltrated with the 7,7,8,8-tetracyanoquinododimethane (TCNQ) solution. Experimental and ab initio calculations results suggest that TCNQ molecule bridging with Fe atoms in NiHCF Prussian blue analogue leads to electronic coupling between TCNQ molecules and NiHCF open-framework, which functions as an electrical highway for electron motion and conductivity enhancement...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28549333/endoplasmic-reticulum-er-stress-and-camp-pka-pathway-mediated-zn-induced-hepatic-lipolysis
#20
Yu-Feng Song, Christer Hogstrand, Chuan-Chuan Wei, Kun Wu, Ya-Xiong Pan, Zhi Luo
The present study was performed to determine the effect of Zn exposure influencing endoplasmic reticulum (ER) stress, explore the underlying molecular mechanism of Zn-induced hepatic lipolysis in a fish species of significance for aquaculture, yellow catfish Pelteobagrus fulvidraco. We found that waterborne Zn exposure evoked ER stress and unfolded protein response (UPR), and activated cAMP/PKA pathway, and up-regulated hepatic lipolysis. The increase in ER stress and lipolysis were associated with activation of cAMP/PKA signaling pathway...
May 23, 2017: Environmental Pollution
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