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https://www.readbyqxmd.com/read/29053845/substitution-of-yor1p-nbd1-residues-improves-the-thermal-stability-of-human-cystic-fibrosis-transmembrane-conductance-regulator
#1
B M Xavier, E Hildebrandt, F Jiang, H Ding, J C Kappes, I L Urbatsch
The Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) is a plasma membrane chloride channel protein that regulates vertebrate fluid homeostasis. The inefficiency of wild type human CFTR protein folding/trafficking is exacerbated by genetic mutations that can cause protein misfolding in the endoplasmic reticulum (ER) and subsequent degradation. This project investigates small changes in protein sequence that can alter the thermal stability of the large multi-domain CFTR protein. We target a conserved 70-residue α-subdomain located in the first nucleotide-binding domain that hosts the common misfolding mutation ∆F508...
October 19, 2017: Protein Engineering, Design & Selection: PEDS
https://www.readbyqxmd.com/read/29050101/-factors-of-hearing-preservation-in-acoustic-neuroma-surgery
#2
H Y Tan, Z Y Wang, H Wu
Over the past 50 years, the focus of acoustic neuroma surgery has shifted from low mortality and tumor resection to retention of neurological function. Hearing preservation is another point in addition to facial nerve function preservation. Hearing preservation rates overall ranged from 2% to 93% in recent studies. Characteristics such as approach, pre-operative neurological function, tumor size, nerve of origin and fundal fluid of the internal auditory canal have been reported as possible influencing factors...
October 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/29043393/characterization-of-a-set-of-abdominal-neuroendocrine-cells-that-regulate-stress-physiology-using-colocalized-diuretic-peptides-in-drosophila
#3
Meet Zandawala, Richard Marley, Shireen A Davies, Dick R Nässel
Multiple neuropeptides are known to regulate water and ion balance in Drosophila melanogaster. Several of these peptides also have other functions in physiology and behavior. Examples are corticotropin-releasing factor-like diuretic hormone (diuretic hormone 44; DH44) and leucokinin (LK), both of which induce fluid secretion by Malpighian tubules (MTs), but also regulate stress responses, feeding, circadian activity and other behaviors. Here, we investigated the functional relations between the LK and DH44 signaling systems...
October 17, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29043350/microfluidic-diafiltration-on-chip-using-an-integrated-magnetic-peristaltic-micropump
#4
Jessica F Liu, Sagar Yadavali, Andrew Tsourkas, David Issadore
Diafiltration is a membrane filtration technique that rapidly removes permeable molecules from a solution by controlling the tangential and orthogonal flows over a membrane and by replenishing the permeate with an equivalent amount of replacement buffer. However, its application to the purification of many key biomaterials and nanomaterials has been limited by the large dead volume (>10 mL) that is required to automate the process. To address this challenge, we have developed a diafiltration-on-a-chip device that can process low-volume samples (50 μL)...
October 18, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/29037033/carboxymethylcellulose-mediates-the-transport-of-carbon-nanotubes-magnetite-nanohybrid-aggregates-in-water-saturated-porous-media
#5
Dengjun Wang, Chang Min Park, Arvid Masud, Nirupam Aich, Chunming Su
Carbon-metal oxide nanohybrids (NHs) are increasingly recognized as the next-generation, promising group of nanomaterials for solving emerging environmental issues and challenges. This research, for the first time, systematically explored the transport and retention of carbon nanotubes-magnetite (CNT-Fe3O4) NH aggregates in water-saturated porous media under environmentally relevant conditions. A macromolecule modifier, carboxymethylcellulose (CMC) was employed to stabilize the NHs. Our results show that transport of the magnetic CNT-Fe3O4 NHs was lower than that of non-magnetic CNT due to larger hydrodynamic sizes of NHs (induced by magnetic attraction) and size-dependent retention in porous media...
October 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29036824/alzheimer-s-disease-biomarkers-and-future-decline-in-cognitive-normal-older-adults
#6
Julien Dumurgier, Bernard J Hanseeuw, Frances B Hatling, Kelly A Judge, Aaron P Schultz, Jasmeer P Chhatwal, Deborah Blacker, Reisa A Sperling, Keith A Johnson, Bradley T Hyman, Teresa Gómez-Isla
BACKGROUND: Identifying older adults at risk of cognitive decline represents a challenge as Alzheimer's disease (AD) modifying therapies move toward preclinical stages. OBJECTIVE: To investigate the relationship between AD biomarkers and subsequent change in cognition in a cohort of cognitively intact older adults. METHODS: 84 cognitively normal subjects (mean age 72.0 years, 59% women) were recruited through the Massachusetts Alzheimer's Disease Research Center and the Harvard Aging Brain Study and followed over 3 years...
October 12, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29034321/refractory-versus-resistant-hypertension-novel-distinctive-phenotypes
#7
Tanja Dudenbostel, Mohammed Siddiqui, Nitin Gharpure, David A Calhoun
Resistant hypertension (RHTN) is relatively common with an estimated prevalence of 10-20% of treated hypertensive patients. It is defined as blood pressure (BP) >140/90 mmHg treated with ≥3 antihypertensive medications, including a diuretic, if tolerated. Refractory hypertension is a novel phenotype of severe antihypertensive treatment failure. The proposed definition for refractory hypertension, i.e. BP >140/90 mmHg with use of ≥5 different antihypertensive medications, including a diuretic and a mineralocorticoid receptor antagonist (MRA) has been applied inconsistently...
September 2017: Journal of Nature and Science
https://www.readbyqxmd.com/read/29031361/treatment-of-disorders-of-sodium-balance-in-chronic-kidney-disease
#8
REVIEW
David H Ellison
Extracellular fluid volume expansion is nearly universal in patients with CKD. Such volume expansion has features similar to the syndrome of heart failure with preserved ejection fraction, which not only leads to symptoms but can also lead to further organ damage. Unique treatment challenges are present in this patient population, including low glomerular filtration, which limits sodium chloride filtration, intrinsic tubule predisposition to sodium chloride retention, and proteinuria. In addition, pharmacokinetic considerations alter the disposition of diuretics in patients with CKD and nephrotic syndrome...
September 2017: Advances in Chronic Kidney Disease
https://www.readbyqxmd.com/read/29030774/effects-of-growth-hormone-therapy-on-bone-density-and-fracture-risk-in-age-related-osteoporosis-in-the-absence-of-growth-hormone-deficiency-a-systematic-review-and-meta-analysis
#9
Maya Barake, Asma Arabi, Nancy Nakhoul, Ghada El-Hajj Fuleihan, Sarah El Ghandour, Anne Klibanski, Nicholas A Tritos
PURPOSE: In adults, growth hormone deficiency (GHD) has been associated with low bone mineral density (BMD), an effect counteracted by growth hormone (GH) replacement. Whether GH is beneficial in adults with age-related bone loss and without hypopituitarism is unclear. METHODS: We conducted a systematic literature search using Medline, Embase and the Cochrane Register of Controlled Trials. We extracted and analyzed data according to the bone outcome included [bone mineral content (BMC), BMD, and bone biomarker, fracture risk]...
October 13, 2017: Endocrine
https://www.readbyqxmd.com/read/29030670/ultra-high-performance-supercritical-fluid-chromatography-with-quadrupole-time-of-flight-mass-spectrometry-uhpsfc-qtof-ms-for-analysis-of-lignin-derived-monomeric-compounds-in-processed-lignin-samples
#10
Jens Prothmann, Mingzhe Sun, Peter Spégel, Margareta Sandahl, Charlotta Turner
The conversion of lignin to potentially high-value low molecular weight compounds often results in complex mixtures of monomeric and oligomeric compounds. In this study, a method for the quantitative and qualitative analysis of 40 lignin-derived compounds using ultra-high-performance supercritical fluid chromatography coupled to quadrupole-time-of-flight mass spectrometry (UHPSFC/QTOF-MS) has been developed. Seven different columns were explored for maximum selectivity. Makeup solvent composition and ion source settings were optimised using a D-optimal design of experiment (DoE)...
October 13, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29020266/propionibacterium-avidum-a-virulent-pathogen-causing-hip-periprosthetic-joint-infection
#11
Yvonne Achermann, Jared Liu, Reinhard Zbinden, Patrick O Zingg, Alexia Anagnostopoulos, Emma Barnard, Reto Sutter, Huiying Li, Andrew McDowell, Annelies S Zinkernagel
Background: Propionibacteria are important members of the human skin microbiota, but are also opportunistic pathogens associated with periprosthetic joint infections (PJI). While the role of Propionibacterium acnes in PJI has been widely described, insight into the capacity of Propionibacterium avidum to cause PJI is limited. Methods: An unusual cluster of four hip PJIs caused by P. avidum in one orthopedic center in 2015 prompted us to retrospectively identify and analyze clinical data related to previous P...
August 2, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29018938/heart-failure-with-preserved-ejection-fraction-current-management-and-future-strategies-expert-opinion-on-the-behalf-of-the-nucleus-of-the-heart-failure-working-group-of-the-german-society-of-cardiology-dkg
#12
REVIEW
Carsten Tschöpe, Christoph Birner, Michael Böhm, Oliver Bruder, Stefan Frantz, Andreas Luchner, Lars Maier, Stefan Störk, Behrouz Kherad, Ulrich Laufs
About 50% of all patients suffering from heart failure (HF) exhibit a reduced ejection fraction (EF ≤ 40%), termed HFrEF. The others may be classified into HF with midrange EF (HFmrEF 40-50%) or preserved ejection fraction (HFpEF, EF ≥ 50%). Presentation and pathophysiology of HFpEF is heterogeneous and its management remains a challenge since evidence of therapeutic benefits on outcome is scarce. Up to now, there are no therapies improving survival in patients with HFpEF. Thus, the treatment targets symptom relief, quality of life and reduction of cardiac decompensations by controlling fluid retention and managing risk factors and comorbidities...
October 10, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/29017388/pathophysiological-bases-of-comorbidity-tbi-and-ptsd
#13
Gary B Kaplan, Kimberly A Leite-Morris, Lei Wang, Kendra K Rumbika, Stephen C Heinrichs, Xiang Zeng, Liquan Wu, Danielle T Arena, Yang D Teng
The high rates of TBI and PTSD diagnoses encountered in recent years by the U.S. Veterans Affairs Healthcare System have increased public awareness and research investigation into these conditions. In this review, we analyze the neural mechanisms underlying the TBI/PTSD comorbidity. TBI and PTSD present with common neuropsychiatric symptoms including anxiety, irritability, insomnia, personality changes and memory problems and this overlap complicates diagnostic differentiation. Interestingly, both TBI and PTSD can be produced by overlapping pathophysiological changes that disrupt neural connections termed the "connectome"...
October 10, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28982672/sodium-and-fluid-excretion-with-torsemide-in-healthy-subjects-is-limited-by-the-short-duration-of-diuretic-action
#14
Salim Shah, Bertram Pitt, D Craig Brater, Peter U Feig, Wen Shen, Fatima S Khwaja, Christopher S Wilcox
BACKGROUND: Loop diuretics are highly natriuretic but their short duration of action permits postdiuretic sodium retention, which limits salt loss unless dietary salt is severely restricted. We tested the hypothesis that a more prolonged duration of action would enhance salt loss. METHODS AND RESULTS: Ten healthy participants were crossed over between 20 mg of oral immediate-release or extended-release (ER) torsemide while consuming a fixed diet with 300 mmol·d(-1) of Na(+)...
October 5, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28978362/reliability-and-utility-of-manual-and-automated-estimates-of-total-intracranial-volume
#15
Samuel J Crowley, Jared J Tanner, Daniel Ramon, Nadine A Schwab, Loren P Hizel, Catherine C Price
OBJECTIVES: Total intracranial volume (TICV) is an important control variable in brain-behavior research, yet its calculation has challenges. Manual TICV (Manual) is labor intensive, and automatic methods vary in reliability. To identify an accurate automatic approach we assessed the reliability of two FreeSurfer TICV metrics (eTIV and Brainmask) relative to manual TICV. We then assessed how these metrics alter associations between left entorhinal cortex (ERC) volume and story retention...
October 5, 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/28977352/the-optimized-hplc-method-for-quantitative-analysis-of-phenylethyl-resorcinol-loaded-in-the-novel-vesicle-carriers-and-permeated-in-invitro-skin-permeation-study
#16
Tunyaluk Limsuwan, Prapaporn Boonme, Thanaporn Amnuaikit
The high performance liquid chromatography (HPLC) was used for quantitative determination of phenylethyl resorcinol (PR) which was loaded in the novel vesicle carriers including ethosome, invasome and transfersome formulations, and permeated into pig skin membrane and receptor fluid for skin permeation study. The reverse-phase chromatography was carried out with a C18 column (150 × 4.6 mm2, 5 μm, HypersilTM, Thermo Fisher Scientific Inc, USA) with the column temperature at 25°C. A mixture of acetonitrile-methanol-Milli-Q water in the ratio of 40:20:40%, v/v/v was used as a mobile phase by maintaining the flow rate at 0...
July 28, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28964272/ultra-high-performance-supercritical-fluid-chromatography-as-a-separation-tool-for-fusarium-mycotoxins-and-their-modified-forms
#17
Marthe De Boevre, Christof Van Poucke, Emmanuel Njumbe Ediage, Dana Vanderputten, Anita Van Landschoot, Sarah De Saeger
A simple, reliable method for the detection of free and modified Fusarium mycotoxins in beer using state-of-the-art ultra-high-performance supercritical fluid chromatography (UHPSFC) with low-resolution tandem MS (MS/MS) is presented in this paper. The UHPSFC-MS/MS method was developed for nivalenol, deoxynivalenol, 15-acetyl-deoxynivalenol, 3-acetyl-deoxynivalenol, deoxynivalenol-3-glucoside, HT-2 toxin, T-2 toxin, T-2 toxin-3-glucoside, neosolaniol, diacetoxyscirpenol, zearalenone, α-zearalenol, and β-zearalenol and their internal standards deepoxy-deoxynivalenol and zearalanone...
October 2, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28945033/-preparation-and-evaluation-of-gastric-adhesive-floating-pellets-for-bolo-leaf-phenols
#18
Ya-Li He, Ying Li, Dan-Dan Yang, Chun-Yan Zhu
Gastric adhesive-floating pellets for Bolo leaf phenols (BLP) were prepared by extrusion-spheronization method, with chitosan as skeleton bioadhesive material, and stearyl alcohol as help-bleaching agent to evaluate its in vitro adhesivity, floatability and in vivo retention situation, and investigate its in vitro release characteristics. The in vitro adhesivity and floatability were evaluated respectively by in vitro tissue retention method and visual observation method. The retention of pellets in rats was investigated by in vivo tissue retention method and in vivo imaging of small animals...
January 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28943207/supramolecular-nano-engineered-lipidic-carriers-based-on-diflunisal-phospholipid-complex-for-transdermal-delivery-qbd-based-optimization-characterization-and-preclinical-investigations-for-management-of-rheumatoid-arthritis
#19
Amanpreet Kaur, Bhupinder Singh Bhoop, Sanjay Chhibber, Gajanand Sharma, Vijay Singh Gondil, Om Prakash Katare
Diflunisal (DIF) is used for treatment of rheumatoid arthritis, osteoarthritis etc. DIF-phospholipid complex (DIF-PL complex) was prepared by solvent-evaporation method and characterized by molecular docking studies, SEM, FTIR, DSC, PXRD studies. Further, the DIF-PL complex was incorporated into supramolecular nano-engineered lipidic carriers (SNLCs) for transdermal delivery. The optimization exercise was done using Face centered cubic design (FCCD) after screening of variables by L8 Taguchi orthogonal array design...
September 21, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28931546/a-new-paradigm-of-sodium-regulation-in-inflammation-and-hypertension
#20
Annet Kirabo
Dysregulation of sodium (Na(+)) balance is a major cause of hypertensive cardiovascular disease. The current dogma is that interstitial Na(+) readily equilibrates with plasma and that renal excretion and reabsorption is sufficient to regulate extracellular fluid volume and control blood pressure. These ideas have been recently challenged by the discovery that Na(+) accumulates in tissues without commensurate volume retention and activates immune cells, leading to hypertension and autoimmune disease. However, objections have been raised to this new paradigm, with some investigators concerned about where and how salt is stored in tissues...
September 20, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
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