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https://www.readbyqxmd.com/read/28646429/decoupled-side-chain-and-backbone-dynamics-for-proton-translocation-m2-of-influenza-a
#1
Monoj Mon Kalita, Wolfgang B Fischer
The 97 amino acid bitopic membrane protein M2 of influenza A forms a tetrameric bundle in which two of the monomers are covalently linked via a cysteine bridge. In its tetrameric assembly the protein conducts protons across the viral envelope and within intracellular compartments during the infectivity cycle of the virus. A key residue in the translocation of the protons is His-37 which forms a planar tetrad in the configuration of the bundle accepting and translocating the incoming protons from the N terminal side, exterior of the virus, to the C terminal side, inside the virus...
July 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28645691/maternal-exposure-to-a-mixture-of-persistent-organic-pollutants-pops-affects-testis-histology-epididymal-sperm-count-and-induces-sperm-dna-fragmentation-in-mice
#2
Abdolrahman Khezri, Birgitte Lindeman, Anette K Krogenæs, Hanne F Berntsen, Karin E Zimmer, Erik Ropstad
Persistent organic pollutants (POPs) are widespread throughout the environment and some are suspected to induce reproductive toxicity. As animals and humans are exposed to complex mixtures of POPs, it is reasonable to assess how such mixtures could interact with the reproductive system. Our aim is to investigate how maternal exposure to a mixture of 29 different persistent organic pollutants, formulated to mimic the relative POP levels in the food basket of the Scandinavian population, could alter reproductive endpoints...
June 20, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28645663/failure-torque-of-ceramic-neck-titanium-implant
#3
Waleed Elshahawy, Raed Ajlouni, Khaldoun Ajlouni, Abdelfattah Sadakah
STATEMENT OF PROBLEM: Dental implants are typically made of titanium. However, with the current systems on the market, the implant neck often shows through the gingival tissues as a black or dark gray line and/or as a grayish discoloration of the peri-implant soft tissue. PURPOSE: The purpose of this in vitro study was to test a new implant design. The key component of this design is the ceramic shell that covers the polished collar of the tissue-level titanium implant and masks its dark color to mimic natural dentition...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28645508/merkel-cell-carcinoma-melanoma-metastatic-mimics-of-breast-cancer
#4
REVIEW
Megan L Troxell
Merkel cell carcinoma and melanoma can each occur primarily in breast skin, or metastasize to the breast. The breast is a rare site of metastasis of essentially any and every type of tumor, including carcinomas, sarcomas, and hematolymphoid neoplasms, and 10-30% of breast metastases may represent the initial presentation of disease. Although metastases generally recapitulate histologic features of the primary tumor, they are diagnostically challenging given their rarity and morphologic overlap with breast carcinoma, including special types of breast cancer...
May 31, 2017: Seminars in Diagnostic Pathology
https://www.readbyqxmd.com/read/28645308/neonatal-aav-delivery-of-alpha-synuclein-induces-pathology-in-the-adult-mouse-brain
#5
Marion Delenclos, Ayman H Faroqi, Mei Yue, Aishe Kurti, Monica Castanedes-Casey, Linda Rousseau, Virginia Phillips, Dennis W Dickson, John D Fryer, Pamela J McLean
Abnormal accumulation of alpha-synuclein (αsyn) is a pathological hallmark of Lewy body related disorders such as Parkinson's disease and Dementia with Lewy body disease. During the past two decades, a myriad of animal models have been developed to mimic pathological features of synucleinopathies by over-expressing human αsyn. Although different strategies have been used, most models have little or no reliable and predictive phenotype. Novel animal models are a valuable tool for understanding neuronal pathology and to facilitate development of new therapeutics for these diseases...
June 23, 2017: Acta Neuropathologica Communications
https://www.readbyqxmd.com/read/28645045/hydra-amphiphiles-using-three-heads-and-one-tail-to-influence-aggregate-formation-and-to-kill-pathogenic-bacteria
#6
Tara M Gallagher, John N Marafino, Brenden K Wimbish, Brandi Volkers, Gabriel Fitzgerald, Kristin McKenna, Jason Floyd, Nicholas T Minahan, Brenna Walsh, Kirstie Thompson, David Bruno, Monica Paneru, Sybelle Djikeng, Stephanie Masters, Suma Haji, Kyle Seifert, Kevin L Caran
Hydra amphiphiles mimic the morphology of the mythical multi-headed creatures for which they are named. Likewise, when faced with a pathogenic bacterium, some hydra derivatives are as destructive as their fabled counterparts were to their adversaries. This report focuses on eight new tricephalic (triple-headed), single-tailed amphiphiles. Each amphiphile has a mesitylene (1,3,5-trimethylbenzene) core, two benzylic trimethylammonium groups and one dimethylalkylammonium group with a linear hydrophobe ranging from short (C8H17) to ultralong (C22H45)...
June 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28644828/a-mutant-of-chlamydomonas-without-lhcsr-maintains-high-rates-of-photosynthesis-but-has-reduced-cell-division-rates-in-sinusoidal-light-conditions
#7
Michael Cantrell, Graham Peers
The LHCSR protein belongs to the light harvesting complex family of pigment-binding proteins found in oxygenic photoautotrophs. Previous studies have shown that this complex is required for the rapid induction and relaxation of excess light energy dissipation in a wide range of eukaryotic algae and moss. The ability of cells to rapidly regulate light harvesting between this dissipation state and one favoring photochemistry is believed to be important for reducing oxidative stress and maintaining high photosynthetic efficiency in a rapidly changing light environment...
2017: PloS One
https://www.readbyqxmd.com/read/28644794/electrocardiogram-signal-quality-assessment-based-on-structural-image-similarity-metric
#8
Yalda Shahriari, Richard Fidler, Michele Pelter, Yong Bai, Andrea Villaroman, Xiao Hu
OBJECTIVE: We developed an image-based electrocardiographic (ECG) quality assessment technique that mimics how clinicians annotate ECG signal quality. METHODS: We adopted the Structural Similarity Measure (SSIM) to compare images of two ECG records that are obtained from displaying ECGs in a standard scale. Then a subset of representative ECG images from the training set was selected as templates through a clustering method. SSIM between each image and all the templates were used as the feature vector for the linear discriminant analysis (LDA) classifier...
June 21, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28644686/cervical-adenocarcinoma-diagnosis-of-human-papillomavirus-positive-and-human-papillomavirus-negative-tumors
#9
Edyta C Pirog
CONTEXT: - Cervical adenocarcinomas span a diverse group of tumors with several distinct histologic tumor types, which include endocervical, endometrioid, intestinal, villoglandular, gastric, signet ring, serous, clear cell, and mesonephric. Diagnosis of cervical adenocarcinoma, especially early diagnosis, poses a significant challenge. OBJECTIVE: - To review the pathogenesis, diagnostic criteria, immunohistochemical markers, and differential diagnosis of various subtypes of human papillomavirus (HPV)-positive and HPV-negative cervical adenocarcinomas...
June 23, 2017: Archives of Pathology & Laboratory Medicine
https://www.readbyqxmd.com/read/28644494/feco-nanoparticles-embedded-carbon-nanofibers-as-robust-peroxidase-mimics-for-sensitive-colorimetric-detection-of-l-cysteine
#10
Zezhou Yang, Yun Zhu, Guangdi Nie, Meixuan Li, Ce Wang, Xiaofeng Lu
A simple and low cost detection of l-cysteine is essential in the fields of biosensors and medical diagnosis. In this study, we have developed a simple electrospinning, followed by calcination process to prepare FeCo nanoparticles embedded in carbon nanofibers (FeCo-CNFs) as an efficient peroxidase-like mimic for the detection of l-cysteine. FeCo nanoparticles are uniformly dispersed within CNFs, and their diameters are highly influenced by the calcination temperature. The calcination temperature also influences the peroxidase-like catalytic activity, and the maximum activity is achieved at a calcination temperature of 550 °C...
June 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28644472/placing-and-shaping-liposomes-with-reconfigurable-dna-nanocages
#11
Zhao Zhang, Yang Yang, Frederic Pincet, Marc C Llaguno, Chenxiang Lin
The diverse structure and regulated deformation of lipid bilayer membranes are among a cell's most fascinating features. Artificial membrane-bound vesicles, known as liposomes, are versatile tools for modelling biological membranes and delivering foreign objects to cells. To fully mimic the complexity of cell membranes and optimize the efficiency of delivery vesicles, controlling liposome shape (both statically and dynamically) is of utmost importance. Here we report the assembly, arrangement and remodelling of liposomes with designer geometry: all of which are exquisitely controlled by a set of modular, reconfigurable DNA nanocages...
June 23, 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28644201/insular-epilepsy-semiology-and-noninvasive-investigations
#12
Sami Obaid, Younes Zerouali, Dang Khoa Nguyen
In this review, authors discuss the semiology and noninvasive investigations of insular epilepsy, an underrecognized type of epilepsy, which may mimic other focal epilepsies. In line with the various functions of the insula and its widespread network of connections, insular epilepsy may feature a variety of early ictal manifestations from somatosensory, visceral, olfactory, gustatory, or vestibular manifestations. Depending on propagation pathways, insular seizures may also include altered consciousness, dystonic posturing, complex motor behaviors, and even autonomic features...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28643859/gibberellic-and-kaurenoic-hybrid-strigolactone-mimics-for-seed-germination-of-parasitic-weeds
#13
Rondinelle G Pereira, Antonio Cala, Mónica Fernández-Aparicio, José M G Molinillo, Maria A D Boaventura, Francisco A Macías
BACKGROUND: Parasitic weeds are widespread and they cause significant losses in important crops. Their germination requires the detection of crop-derived molecules such as strigolactones. Strigolactone mimics are germination-inducing molecules with potential to apply the suicidal germination strategy for seed bank control of parasitic weeds. RESULTS: Attachment of the D-ring, which is instrumental in the germination process of seeds of parasitic weeds, has been carried out to gibberellin (GA3 ) and kaurenoic as the scaffold...
June 23, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28643827/anti-oxidant-and-immune-modulatory-properties-of-sulfated-alginate-derivatives-on-human-chondrocytes-and-macrophages
#14
Anne Kerschenmeyer, Øystein Arlov, Vera Malheiro, Matthias Steinwachs, Markus Rottmar, Katharina Maniura-Weber, Gemma Palazzolo, Marcy Zenobi-Wong
Degeneration of articular cartilage represents one of the most common causes of pain and disability in our aging society. Current treatments only address the symptoms of joint disease, but not their underlying causes which include oxidative stress and inflammation in cartilage and surrounding tissues. Sulfated biopolymers that mimic aspects of the native extracellular environment of cartilage are recently gaining interest as a means to slow the inflammatory events responsible for tissue degeneration. Here we show that the natural polysaccharide alginate and particularly its sulfated derivatives have potent anti-oxidant, anti-inflammatory and anti-immunogenic properties in vitro...
June 23, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28643379/tuning-the-inter-nanofibril-interaction-to-regulate-the-morphology-and-function-of-peptide-dna-co-assembled-viral-mimics
#15
Rong Ni, Ying Chau
The ability to tune the inter-subunit interaction within the virus capsid may be critical to assembly and biological function. This process has been extended here with peptide/DNA co-assembled viral mimics. The resulting co-assemblies, formed and stabilized by both DNA-peptide nanofibril and peptide nanofibril-nanofibril interactions, have been tuned through hydrophobic packing interactions of the peptide sequences. By strengthening peptide side chain complementarity and/or elongating the peptide chain (from 4 to 8 residues), we report strengthening the inter-nanofibril interaction to create stable nanococoons with high gene transfection efficacy...
June 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28642817/cerebral-vasculitis-mimicking-intracranial-metastatic-progression-of-lung-cancer-during-pd-1-blockade
#16
Heinz Läubli, Jürgen Hench, Michal Stanczak, Ingmar Heijnen, Alexandros Papachristofilou, Stephan Frank, Alfred Zippelius, Frank Stenner-Liewen
BACKGROUND: Stimulation of the immune system by targeting the PD-1/PD-L1 pathway can result in activation of anti-tumor immunity. Besides its clinical benefit immune checkpoint therapy leads to significant immune-related adverse events (irAEs). Some rare irAEs are not well described yet but are critical in patient management. CASE PRESENTATION: Here, we describe a case of autoimmune cerebral vasculitis/encephalitis after PD-1 inhibitor treatment for metastatic adenocarcinoma of the lung...
2017: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/28642712/investigations-into-the-sarcomeric-protein-and-ca-2-regulation-abnormalities-underlying-hypertrophic-cardiomyopathy-in-cats-felix-catus
#17
Andrew E Messer, Jasmine Chan, Alex Daley, O'Neal Copeland, Steven B Marston, David J Connolly
Hypertrophic cardiomyopathy (HCM) is the most common single gene inherited cardiomyopathy. In cats (Felix catus) HCM is even more prevalent and affects 16% of the outbred population and up to 26% in pedigree breeds such as Maine Coon and Ragdoll. Homozygous MYBPC3 mutations have been identified in these breeds but the mutations in other cats are unknown. At the clinical and physiological level feline HCM is closely analogous to human HCM but little is known about the primary causative mechanism. Most identified HCM causing mutations are in the genes coding for proteins of the sarcomere...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28642653/clinical-application-of-a-drill-guide-template-for-pedicle-screw-placement-in-severe-scoliosis
#18
Xin Li, Yaoshen Zhang, Qiang Zhang, Changsong Zhao, Kun Liu
OBJECTIVE: To evaluate the accuracy and the effect of drill guide template for pedicle screw placement in severe scoliosis. METHOD: Eight patients with rigid scoliosis were enrolled, five males and three females, ranging from nine to 23 years old. A three-dimensional CT scan of the spine was performed and saved as a DICOM file type. The multi-level template was designed by Mimics software and manufactured according to the part of the most severe deformity. The drill template was placed on the corresponding vertebral surface...
March 2017: Acta Ortopedica Brasileira
https://www.readbyqxmd.com/read/28642572/disrupted-pursuit-compensation-during-self-motion-perception-in-early-alzheimer-s-disease
#19
Jingru Wang, Xiaojun Guo, Xianbo Zhuang, Tuanzhi Chen, Wei Yan
Our perception of the world is remarkably stable despite of distorted retinal input due to frequent eye movements. It is considered that the brain uses corollary discharge, efference copies of signals sent from motor to visual regions, to compensate for distortions and stabilize visual perception. In this study, we tested whether patients with Alzheimer's disease (AD) have impaired corollary discharge functions as evidenced by reduced compensation during the perception of optic flow that mimics self-motion in the environment...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642036/transcription-factor-decoy-technology-a-therapeutic-update
#20
REVIEW
Markus Hecker, Andreas H Wagner
Targeting transcription factors represents one possibility to interfere with a known activated regulatory pathway that promotes disease. Double-stranded transcription factor decoy (TFD) oligodeoxynucleotides (ODN) are therapeutic drug candidates, which are able to specifically target and neutralize key transcription factors involved in the pathogenesis of a given disease. These short double-stranded TFD molecules mimic the consensus DNA binding site of a specific transcription factor in the promoter region of its target genes...
June 19, 2017: Biochemical Pharmacology
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