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https://www.readbyqxmd.com/read/27926995/frozen-but-no-accident-why-the-20-standard-amino-acids-were-selected
#1
REVIEW
Andrew J Doig
The 20 standard amino acids encoded by the Genetic Code were adopted during the RNA World, around 4 billion years ago. This amino acid set could be regarded as a frozen accident, implying that other possible structures could equally well have been chosen to use in proteins. Amino acids were not primarily selected for their ability to support catalysis, since the RNA World already had highly effective cofactors to perform reactions, such as oxidation, reduction and transfer of small molecules. Rather, they were selected to enable the formation of soluble structures with close-packed cores, allowing the presence of ordered binding pockets...
December 7, 2016: FEBS Journal
https://www.readbyqxmd.com/read/27926971/management-of-endometriomas
#2
Ludovico Muzii, Chiara Di Tucci, Mara Di Feliciantonio, Giulia Galati, Ludovica Verrelli, Violante Di Donato, Claudia Marchetti, Pierluigi Benedetti Panici
Ovarian endometriomas affect 17 to 44% of women with endometriosis, and are often associated with pelvic pain and infertility. Treatment options include expectant management, medical and/or surgical treatment, and in vitro fertilization and embryo transfer (IVF-ET). The choice of treatment depends mostly on the associated symptoms. In most cases, surgery is the preferred choice, since endometriomas do not respond to medical treatment, which may only treat associated pain. In case of infertility, IVF-ET may be a suitable alternative to surgery, particularly when there is no associated pain...
December 7, 2016: Seminars in Reproductive Medicine
https://www.readbyqxmd.com/read/27926878/the-csk-associated-adaptor-pag-inhibits-effector-t-cell-activation-in-cooperation-with-phosphatase-ptpn22-and-dok-adaptors
#3
Dominique Davidson, Ming-Chao Zhong, Pier Paolo Pandolfi, Silvia Bolland, Ramnik J Xavier, Brian Seed, Xin Li, Hua Gu, André Veillette
The transmembrane adaptor PAG (Cbp) has been proposed to mediate membrane recruitment of Csk, a cytoplasmic protein tyrosine kinase playing a critical inhibitory role during T cell activation, by inactivating membrane-associated Src kinases. However, this model has not been validated by genetic evidence. Here, we demonstrate that PAG-deficient mice display enhanced T cell activation responses in effector, but not in naive, T cells. PAG-deficient mice also have augmented T cell-dependent autoimmunity and greater resistance to T cell anergy...
December 6, 2016: Cell Reports
https://www.readbyqxmd.com/read/27926877/ptbp1-and-ptbp2-serve-both-specific-and-redundant-functions-in-neuronal-pre-mrna-splicing
#4
John K Vuong, Chia-Ho Lin, Min Zhang, Liang Chen, Douglas L Black, Sika Zheng
Families of alternative splicing regulators often contain multiple paralogs presumed to fulfill different functions. Polypyrimidine tract binding proteins PTBP1 and PTBP2 reprogram developmental pre-mRNA splicing in neurons, but how their regulatory networks differ is not understood. To compare their targeting, we generated a knockin allele that conditionally expresses PTBP1. Bred to a Ptbp2 knockout, the transgene allowed us to compare the developmental and molecular phenotypes of mice expressing only PTBP1, only PTBP2, or neither protein in the brain...
December 6, 2016: Cell Reports
https://www.readbyqxmd.com/read/27926845/membrane-bound-alpha-synuclein-clusters-induce-impaired-lipid-diffusion-and-increased-lipid-packing
#5
Aditya Iyer, Nathalie Schilderink, Mireille M A E Claessens, Vinod Subramaniam
The aggregation of membrane-bound α-synuclein (αS) into oligomers and/or amyloid fibrils has been suggested to cause membrane damage in in vitro model phospholipid membrane systems and in vivo. In this study, we investigate how αS interactions that precede the formation of well-defined aggregates influence physical membrane properties. Using three truncated variants of αS with different aggregation propensities and comparable phospholipid membrane binding affinities we show, using fluorescence recovery after photobleaching (FRAP) and fluorescence anisotropy measurements, that formation of αS clusters on supported lipid bilayers (SLBs) impairs lateral lipid diffusion and increases lipid packing beneath the αS clusters...
December 6, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27926844/intracellular-requirements-for-passive-proton-transport-through-the-na-k-atpase
#6
Kevin S Stanley, Dylan J Meyer, Craig Gatto, Pablo Artigas
The Na(+),K(+)-ATPase (NKA or Na/K pump) hydrolyzes one ATP to exchange three intracellular Na+ (Na(+)i) for two extracellular K+ (K(+)o) across the plasma membrane by cycling through a set of reversible transitions between phosphorylated and dephosphorylated conformations, alternately opening ion-binding sites externally (E2) or internally (E1). With subsaturating [Na(+)]o and [K(+)]o, the phosphorylated E2P conformation passively imports protons generating an inward current (IH), which may be exacerbated in NKA-subunit mutations associated with human disease...
December 6, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27926839/circular-dichroism-spectroscopy-of-collagen-fibrillogenesis-a-new-use-for-an-old-technique
#7
Kathryn E Drzewiecki, Daniel R Grisham, Avanish S Parmar, Vikas Nanda, David I Shreiber
Type-I collagen assembles in a stepwise, hierarchic fashion from the folding of the triple helix to the assembly of fibrils into fibers. The mature assembled fibers are crucial for tissue structure and mechanics, cell interactions, and other functions in vivo. Although triple helix folding can be followed with the use of optical methods such as circular dichroism (CD) spectroscopy, fibrillogenesis is typically measured by alternative methods such as turbidity, rheology, and microscopy. Together, these approaches allow for investigation of the mechanical properties and architectures of collagen-based scaffolds and excised tissues...
December 6, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27926819/a-plea-for-linguistic-accuracy-also-for-candidatus-taxa
#8
Aharon Oren
While all names of new taxa submitted to the International Journal of Systematic and Evolutionary Microbiology), either in direct submissions or in validation requests for names effectively published elsewhere, are subject to nomenclatural review to ensure that they are acceptable based on the rules of the International Code of Nomenclature of Prokaryotes, the names of Candidatus taxa have not been subjected to such a review. Formally, this was not necessary because the rank of Candidatus is not covered by the Code, and the names lack the priority afforded validly published names...
December 7, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27926740/a-17-gene-stemness-score-for-rapid-determination-of-risk-in-acute-leukaemia
#9
Stanley W K Ng, Amanda Mitchell, James A Kennedy, Weihsu C Chen, Jessica McLeod, Narmin Ibrahimova, Andrea Arruda, Andreea Popescu, Vikas Gupta, Aaron D Schimmer, Andre C Schuh, Karen W Yee, Lars Bullinger, Tobias Herold, Dennis Görlich, Thomas Büchner, Wolfgang Hiddemann, Wolfgang E Berdel, Bernhard Wörmann, Meyling Cheok, Claude Preudhomme, Herve Dombret, Klaus Metzeler, Christian Buske, Bob Löwenberg, Peter J M Valk, Peter W Zandstra, Mark D Minden, John E Dick, Jean C Y Wang
Refractoriness to induction chemotherapy and relapse after achievement of remission are the main obstacles to cure in acute myeloid leukaemia (AML). After standard induction chemotherapy, patients are assigned to different post-remission strategies on the basis of cytogenetic and molecular abnormalities that broadly define adverse, intermediate and favourable risk categories. However, some patients do not respond to induction therapy and another subset will eventually relapse despite the lack of adverse risk factors...
December 7, 2016: Nature
https://www.readbyqxmd.com/read/27926632/a-pooled-analysis-of-robotic-versus-laparoscopic-surgery-for-colon-cancer
#10
Bo-Shi Duan, Guo-Hua Zhao, Helen Yang, Yue Wang
OBJECTIVE: An increasing number of studies have been reported since the "Da Vinci" Robotic System was used in gastrointestinal disease. Thus, we conducted this meta-analysis to evaluate the safety and efficacy of robotic colectomy (RC) compared with laparoscopic colectomy (LC) in the treatment of colon cancer. METHOD: A systematic search of Medline, Embase databases, and the Cochrane Library was performed to identify studies that compared RC and LC and were published up to February 2015...
December 2016: Surgical Laparoscopy, Endoscopy & Percutaneous Techniques
https://www.readbyqxmd.com/read/27926630/the-analgesic-effect-of-ropivacaine-combined-with-dexmedetomidine-for-incision-infiltration-after-laparoscopic-cholecystectomy
#11
Jun-Ma Yu, Hao Sun, Chao Wu, Chun-Shan Dong, Yao Lu, Ye Zhang
BACKGROUND: Local anesthetics infiltration is one consensus efficient strategy for pain relief after laparoscopic cholecystectomy (LC). The aim of this study was to investigate analgesia efficacy of incisional infiltration with ropivacaine plus dexmedetomidine. METHODS: Patients scheduled for LC were assigned to 4 groups by different medications for trocar wound infiltration. The incidence of adverse events and the analgesic effect of ropivacaine combined with dexmedetomidine for incision infiltration were recorded...
December 2016: Surgical Laparoscopy, Endoscopy & Percutaneous Techniques
https://www.readbyqxmd.com/read/27926576/laparoscopic-intragastric-resection-an-alternative-technique-for-minimally-invasive-treatment-of-gastric-submucosal-tumors
#12
Cindy Boulanger-Gobeil, Jean-Pierre Gagné, François Julien, Valérie Courval, Kaitlyn Beyfuss, Shady Ashamalla, Julie Hallet
OBJECTIVE: To present the technique for and early results of laparoscopic intragastric resection (LIGR). BACKGROUND: Treatment of confirmed or suspected submucosal gastric malignancies relies on clear margin resection, for which minimally invasive surgery is widely accepted. However, resection in some localization remains challenging. METHODS: We present the steps of LIGR for gastric submucosal tumors (GSMTs). We report the results of LIGR in consecutive patients operated at 2 institutions, including intraoperative, pathologic, 30-day major morbidity and mortality characteristics...
December 6, 2016: Annals of Surgery
https://www.readbyqxmd.com/read/27926564/systematic-review-and-meta-analysis-of-prophylactic-mesh-during-primary-stoma-formation-to-prevent-parastomal-hernia
#13
Stephen J Chapman, Benjamin Wood, Thomas M Drake, Neville Young, David G Jayne
BACKGROUND: Implantation of mesh at the time of stoma formation may reduce the rate of parastomal hernia. Until recently, the evidence has been limited to only a few small randomized controlled trials. OBJECTIVE: We present an updated systematic review and meta-analysis to assess the effect of mesh prophylaxis on rates of parastomal hernia. We examine ongoing and unpublished trials via online registries and propose recommendations for future research. DATA SOURCES: MEDLINE, EMBASE, and the Cochrane Library were searched up to March 2016 for published randomized controlled trials...
January 2017: Diseases of the Colon and Rectum
https://www.readbyqxmd.com/read/27926561/percutaneous-posterior-tibial-nerve-stimulation-vs-perianal-application-of-glyceryl-trinitrate-ointment-in-the-treatment-of-chronic-anal-fissure-a-randomized-clinical-trial
#14
Jaime Ruiz-Tovar, Carolina Llavero
BACKGROUND: Current therapeutic guidelines for the treatment of chronic anal fissure establish a medical approach as the first step. Glyceryl trinitrate ointment is the most popular of the available topical treatments in Spain but it is associated with the appearance of headache. OBJECTIVE: The purpose of this study was to compare the compliance rate among patients receiving glyceryl trinitrate treatment for chronic anal fissure with that among patients receiving percutaneous posterior tibial nerve stimulation...
January 2017: Diseases of the Colon and Rectum
https://www.readbyqxmd.com/read/27926515/metformin-and-propranolol-combination-prevents-cancer-progression-and-metastasis-in-different-breast-cancer-models
#15
María Rico, María Baglioni, Maryna Bondarenko, Nahuel Cesatti Laluce, Viviana Rozados, Nicolas André, Manon Carré, O Graciela Scharovsky, Mauricio Menacho Márquez
Discovery of new drugs for cancer treatment is an expensive and time-consuming process and the percentage of drugs reaching the clinic remains quite low.Drug repositioning refers to the identification and development of new uses for existing drugs and represents an alternative drug development strategy.In this work, we evaluated the antitumor effect of metronomic treatment with a combination of two repositioned drugs, metformin and propranolol, in triple negative breast cancer models.By in vitro studies with five different breast cancer derived cells, we observed that combined treatment decreased proliferation (P < 0...
December 1, 2016: Oncotarget
https://www.readbyqxmd.com/read/27926512/depression-of-oncogenecity-by-dephosphorylating-and-degrading-bcr-abl
#16
Miao Gao, Zheng-Lan Huang, Kun Tao, Qing Xiao, Xin Wang, Wei-Xi Cao, Min Xu, Jing Hu, Wen-Li Feng
Aberrant phosphorylation and overexpression of BCR-ABL fusion protein are responsible for the main pathogenesis in chronic myeloid leukemia (CML). Phosphorylated BCR-ABL Y177 recruits GRB2 adaptor and triggers leukemic RAS-MAPK and PI3K-AKT signals. In this study, we engineered a SPOA system to dephosphorylate and degrade BCR-ABL by targeting BCR-ABL Y177. We tested its effect on BCR-ABL phosphorylation and expression, as well as cell proliferation and apoptosis in CML cells. We found that SPOA remarkably dephosphorylated BCR-ABL Y177, prevented GRB2 recruitment, and uncoupled RAS-MAPK and PI3K-AKT signals...
December 1, 2016: Oncotarget
https://www.readbyqxmd.com/read/27926480/calcium-dependent-binding-of-myc-to-calmodulin
#17
Philipp Raffeiner, Andrea Schraffl, Thomas Schwarz, Ruth Röck, Karin Ledolter, Markus Hartl, Robert Konrat, Eduard Stefan, Klaus Bister
The bHLH-LZ (basic region/helix-loop-helix/leucine zipper) oncoprotein Myc and the bHLH-LZ protein Max form a binary transcription factor complex controlling fundamental cellular processes. Deregulated Myc expression leads to neoplastic transformation and is a hallmark of most human cancers. The dynamics of Myc transcription factor activity are post-translationally coordinated by defined protein-protein interactions. Here, we present evidence for a second messenger controlled physical interaction between the Ca2+ sensor calmodulin (CaM) and all Myc variants (v-Myc, c-Myc, N-Myc, and L-Myc)...
December 1, 2016: Oncotarget
https://www.readbyqxmd.com/read/27926450/changing-health-behavior-motivation-from-i-must-to-i-want
#18
S Knecht, P Kenning
In the past, medicine was dominated by acute diseases. Since treatments were unknown to patients they followed their medical doctors´ directives-at least for the duration of the disease. Behavior was thus largely motivated by avoiding expected costs associated with alternative behaviors (I-must). The health challenges prevailing today are chronic conditions resulting from the way we chose to live. Traditional directive communication has not been successful in eliciting and maintaining appropriate lifestyle changes...
2016: Progress in Brain Research
https://www.readbyqxmd.com/read/27926444/common-and-distinctive-approaches-to-motivation-in-different-disciplines
#19
T Strombach, S Strang, S Q Park, P Kenning
Over the last couple of decades, a body of theories has emerged that explains when and why people are motivated to act. Multiple disciplines have investigated the origins and consequences of motivated behavior, and have done so largely in parallel. Only recently have different disciplines, like psychology and economics, begun to consolidate their knowledge, attempting to integrate findings. The following chapter presents and discusses the most prominent approaches to motivation in the disciplines of biology, psychology, and economics...
2016: Progress in Brain Research
https://www.readbyqxmd.com/read/27926441/a-benefit-cost-framework-of-motivation-for-a-specific-activity
#20
B Studer, S Knecht
How can an individual be motivated to perform a target exercise or activity? This question arises in training, therapeutic, and education settings alike, yet despite-or even because of-the large range of extant motivation theories, finding a clear answer to this question can be challenging. Here we propose an application-friendly framework of motivation for a specific activity or exercise that incorporates core concepts from several well-regarded psychological and economic theories of motivation. The key assumption of this framework is that motivation for performing a given activity is determined by the expected benefits and the expected costs of (performance of) the activity...
2016: Progress in Brain Research
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