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[Alexander Lee]

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https://www.readbyqxmd.com/read/27925638/biomechanical-analysis-of-intervertebral-cement-extravasation-in-vertebral-motion-segments
#1
Trevor C Wahlquist, John J Lee, Alexander Brunfeldt, Geoffrey T Burns, Rakesh D Patel, Gregory P Graziano
Kyphoplasty is a therapeutic option for pain relief in the setting of compression fractures. Cement extravasation into adjacent disks is a common occurrence. The biomechanical and clinical consequences of cement in the disks currently are unknown. This study investigated the biomechanical effects of cement extravasation into the intervertebral disk in a human cadaveric model. Seven thoracolumbar and lumbar embalmed human cadaveric motion segments were evaluated in axial rotation, right and left lateral bending, and flexion and extension...
December 7, 2016: Orthopedics
https://www.readbyqxmd.com/read/27920990/angiosarcoma-of-the-adrenal-gland-treated-using-a-multimodal-approach
#2
Jay G Fuletra, Benjamin T Ristau, Barton Milestone, Harry S Cooper, Alysia Browne, Sujana Movva, Thomas J Galloway, Randall Lee, Nikhil Waingankar, Alexander Kutikov
Angiosarcoma of the adrenal gland is an extremely rare malignancy. We report a case of a 59-year-old female who presented with abdominal pain and profound anemia. A 7 cm enhancing, lipid-poor adrenal mass with calcifications that extended posterior to the vena cava was identified on imaging. Patient underwent right adrenalectomy with retroperitoneal lymph node dissection. Pathology demonstrated angiosarcoma of the adrenal gland. Consolidative treatment included adjuvant radiation and chemotherapy. Patient remains disease free 1...
January 2017: Urology Case Reports
https://www.readbyqxmd.com/read/27917391/adrift-in-the-gray-zone-irb-perspectives-on-research-in-the-learning-health-system
#3
Sandra Soo-Jin Lee, Maureen Kelley, Mildred K Cho, Stephanie Alessi Kraft, Cyan James, Melissa Constantine, Adrienne N Meyer, Douglas Diekema, Alexander M Capron, Benjamin S Wilfond, David Magnus
BACKGROUND: Human subjects protection in healthcare contexts rests on the premise that a principled boundary distinguishes clinical research and clinical practice. However, growing use of evidence-based clinical practices by health systems makes it increasingly difficult to disentangle research from a wide range of clinical activities that are sometimes called "research on medical practice" (ROMP), including quality improvement activities and comparative effectiveness research. The recent growth of ROMP activities has created an ethical and regulatory gray zone with significant implications for the oversight of human subjects research...
2016: AJOB Empirical Bioethics
https://www.readbyqxmd.com/read/27913098/succinyl-coa-synthetase-sucla2-deficiency-in-two-siblings-with-impaired-activity-of-other-mitochondrial-oxidative-enzymes-in-skeletal-muscle-without-mitochondrial-dna-depletion
#4
Xiaoping Huang, Jirair K Bedoyan, Didem Demirbas, David J Harris, Alexander Miron, Simone Edelheit, George Grahame, Suzanne D DeBrosse, Lee-Jun Wong, Charles L Hoppel, Douglas S Kerr, Irina Anselm, Gerard T Berry
Mutations in SUCLA2 result in succinyl-CoA ligase (ATP-forming) or succinyl-CoA synthetase (ADP-forming) (A-SCS) deficiency, a mitochondrial tricarboxylic acid cycle disorder. The phenotype associated with this gene defect is largely encephalomyopathy. We describe two siblings compound heterozygous for SUCLA2 mutations, c.985A>G (p.M329V) and c.920C>T (p.A307V), with parents confirmed as carriers of each mutation. We developed a new LC-MS/MS based enzyme assay to demonstrate the decreased SCS activity in the siblings with this unique genotype...
November 12, 2016: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/27912061/tumor-interferon-signaling-regulates-a-multigenic-resistance-program-to-immune-checkpoint-blockade
#5
Joseph L Benci, Bihui Xu, Yu Qiu, Tony J Wu, Hannah Dada, Christina Twyman-Saint Victor, Lisa Cucolo, David S M Lee, Kristen E Pauken, Alexander C Huang, Tara C Gangadhar, Ravi K Amaravadi, Lynn M Schuchter, Michael D Feldman, Hemant Ishwaran, Robert H Vonderheide, Amit Maity, E John Wherry, Andy J Minn
Therapeutic blocking of the PD1 pathway results in significant tumor responses, but resistance is common. We demonstrate that prolonged interferon signaling orchestrates PDL1-dependent and PDL1-independent resistance to immune checkpoint blockade (ICB) and to combinations such as radiation plus anti-CTLA4. Persistent type II interferon signaling allows tumors to acquire STAT1-related epigenomic changes and augments expression of interferon-stimulated genes and ligands for multiple T cell inhibitory receptors...
December 1, 2016: Cell
https://www.readbyqxmd.com/read/27911819/programmable-and-reversible-plasmon-mode-engineering
#6
Ankun Yang, Alexander J Hryn, Marc R Bourgeois, Won-Kyu Lee, Jingtian Hu, George C Schatz, Teri W Odom
Plasmonic nanostructures with enhanced localized optical fields as well as narrow linewidths have driven advances in numerous applications. However, the active engineering of ultranarrow resonances across the visible regime-and within a single system-has not yet been demonstrated. This paper describes how aluminum nanoparticle arrays embedded in an elastomeric slab may exhibit high-quality resonances with linewidths as narrow as 3 nm at wavelengths not accessible by conventional plasmonic materials. We exploited stretching to improve and tune simultaneously the optical response of as-fabricated nanoparticle arrays by shifting the diffraction mode relative to single-particle dipolar or quadrupolar resonances...
November 28, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27909008/trajectory-of-parvalbumin-cell-impairment-and-loss-of-cortical-inhibition-in-traumatic-brain-injury
#7
Tsung-Hsun Hsieh, Henry Hing Cheong Lee, Mustafa Qadir Hameed, Alvaro Pascual-Leone, Takao K Hensch, Alexander Rotenberg
Many neuropsychiatric symptoms that follow traumatic brain injury (TBI), including mood disorders, sleep disturbance, chronic pain, and posttraumatic epilepsy (PTE) are attributable to compromised cortical inhibition. However, the temporal trajectory of cortical inhibition loss and its underlying mechanisms are not known. Using paired-pulse transcranial magnetic stimulation (ppTMS) and immunohistochemistry, we tracked functional and cellular changes of cortical inhibitory network elements after fluid-percussion injury (FPI) in rats...
November 30, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/27905022/neurophysiology-of-space-travel-energetic-solar-particles-cause-cell-type-specific-plasticity-of-neurotransmission
#8
Sang-Hun Lee, Barna Dudok, Vipan K Parihar, Kwang-Mook Jung, Miklós Zöldi, Young-Jin Kang, Mattia Maroso, Allyson L Alexander, Gregory A Nelson, Daniele Piomelli, István Katona, Charles L Limoli, Ivan Soltesz
In the not too distant future, humankind will embark on one of its greatest adventures, the travel to distant planets. However, deep space travel is associated with an inevitable exposure to radiation fields. Space-relevant doses of protons elicit persistent disruptions in cognition and neuronal structure. However, whether space-relevant irradiation alters neurotransmission is unknown. Within the hippocampus, a brain region crucial for cognition, perisomatic inhibitory control of pyramidal cells (PCs) is supplied by two distinct cell types, the cannabinoid type 1 receptor (CB1)-expressing basket cells (CB1BCs) and parvalbumin (PV)-expressing interneurons (PVINs)...
November 30, 2016: Brain Structure & Function
https://www.readbyqxmd.com/read/27903891/cloning-independent-markerless-gene-editing-in-streptococcus-sanguinis-novel-insights-in-type-iv-pilus-biology
#9
Ishwori Gurung, Jamie-Lee Berry, Alexander M J Hall, Vladimir Pelicic
Streptococcus sanguinis, a naturally competent opportunistic human pathogen, is a Gram-positive workhorse for genomics. It has recently emerged as a model for the study of type IV pili (Tfp)-exceptionally widespread and important prokaryotic filaments. To enhance genetic manipulation of Streptococcus sanguinis, we have developed a cloning-independent methodology, which uses a counterselectable marker and allows sophisticated markerless gene editing in situ We illustrate the utility of this methodology by answering several questions regarding Tfp biology by (i) deleting single or mutiple genes, (ii) altering specific bases in genes of interest, and (iii) engineering genes to encode proteins with appended affinity tags...
November 29, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27902784/dynamic-in-vivo-mutations-within-the-ica-operon-during-persistence-of-staphylococcus-aureus-in-the-airways-of-cystic-fibrosis-patients
#10
Bianca Schwartbeck, Johannes Birtel, Janina Treffon, Lars Langhanki, Alexander Mellmann, Devika Kale, Janina Kahl, Nina Hirschhausen, Claudia Neumann, Jean C Lee, Friedrich Götz, Holger Rohde, Hanae Henke, Peter Küster, Georg Peters, Barbara C Kahl
Cystic fibrosis (CF) is associated with chronic bacterial airway infections leading to lung insufficiency and decreased life expectancy. Staphylococcus aureus is one of the most prevalent pathogens isolated from the airways of CF patients. Mucoid colony morphology has been described for Pseudomonas aeruginosa, the most common pathogen in CF, but not for S. aureus. From the airways of 8 of 313 CF patients (2.5%) mucoid S. aureus isolates (n = 115) were cultured with a mean persistence of 29 months (range 1 month, 126 months)...
November 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27899769/the-role-of-club-cell-phenoconversion-and-migration-in-idiopathic-pulmonary-fibrosis
#11
Jutaro Fukumoto, Ramani Soundararajan, Joseph Leung, Ruan Cox, Sanjay Mahendrasah, Neha Muthavarapu, Travis Herrin, Alexander Czachor, Lee C Tan, Nima Hosseinian, Priyanshi Patel, Jayanthraj Gone, Mason T Breitzig, Young Cho, Andrew J Cooke, Lakshmi Galam, Venkata Ramireddy Narala, Yashwant Pathak, Richard F Lockey, Narasaiah Kolliputi
Idiopathic pulmonary fibrosis (IPF) is an age-related multifactorial disease featuring non-uniform lung fibrosis. The decisive cellular events at early stages of IPF are poorly understood. While the involvement of club cells in IPF pathogenesis is unclear, their migration has been associated with lung fibrosis. In this study, we labeled club cells immunohistochemically in IPF lungs using a club cell marker Claudin-10 (Cldn10), a unique protein based on the recent report which demonstrated that the appearance of Cldn10 in developing and repairing lungs precedes other club cell markers including club cell secretory protein (CCSP)...
November 29, 2016: Aging
https://www.readbyqxmd.com/read/27896895/five-year-efficacy-and-safety-of-tenofovir-based-salvage-therapy-for-patients-with-chronic-hepatitis-b-who-previously-failed-lam-adv-therapy
#12
Lucy Lim, Alexander Thompson, Scott Patterson, Jacob George, Simone Strasser, Alice Lee, William Sievert, Amanda Nicoll, Paul Desmond, Stuart Roberts, Kaye Marion, Scott Bowden, Stephen Locarnini, Peter Angus
BACKGROUND: Multidrug resistant HBV continues to be an important clinical problem. The TDF-109 study demonstrated that TDF±LAM is effective salvage therapy through 96 weeks for LAM resistant patients who previously failed ADV add-on or switch therapy. We evaluated the 5 year efficacy and safety outcomes in patients receiving long-term TDF±LAM in the TDF-109 study. METHODS: 59 patients completed the first phase of the TDF-109 study and 54/59 were rolled over into a long-term prospective open-label study of TDF±LAM 300mg daily...
November 29, 2016: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/27895178/conserved-region-c-functions-to-regulate-pd-1-expression-and-subsequent-cd8-t-cell-memory
#13
Alexander P R Bally, Yan Tang, Joshua T Lee, Benjamin G Barwick, Ryan Martinez, Brian D Evavold, Jeremy M Boss
Expression of programmed death 1 (PD-1) on CD8 T cells promotes T cell exhaustion during chronic Ag exposure. During acute infections, PD-1 is transiently expressed and has the potential to modulate CD8 T cell memory formation. Conserved region C (CR-C), a promoter proximal cis-regulatory element that is critical to PD-1 expression in vitro, responds to NFATc1, FoxO1, and/or NF-κB signaling pathways. Here, a CR-C knockout mouse was established to determine its role on PD-1 expression and the corresponding effects on T cell function in vivo...
November 28, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27894874/mark-inhibitors-declaring-a-no-go-decision-on-a-chemical-series-based-on-extensive-dmpk-experimentation
#14
Andrew M Haidle, Kaleen K Childers, Anna A Zabierek, Jason D Katz, James P Jewell, Yongquan Hou, Michael D Altman, Alexander Szewczak, Dapeng Chen, Andreas Harsch, Mansuo Hayashi, Lee Warren, Michael Hutton, Hugh Nuthall, Matt G Stanton, Ian W Davies, Ben Munoz, Alan Northrup
Attempts to optimize pharmacokinetic properties in a promising series of pyrrolopyrimidinone MARK inhibitors for the treatment of Alzheimer's disease are described. A focus on physical properties and ligand efficiency while prosecuting this series afforded key tool compounds that revealed a large discrepancy in the rat in vitro-in vivo DMPK (Drug Metabolism/Pharmacokinetics) correlation. These differences prompted an in vivo rat disposition study employing a radiolabeled representative of the series, and the results from this experiment justified the termination of any further optimization efforts...
August 25, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27879433/comparison-of-shape-reagents-for-mapping-rna-structures-inside-living-cells
#15
Byron Lee, Ryan Alexander Flynn, Anastasia Kadina, Jimmy K Guo, Eric T Kool, Howard Y Chang
Recent advances in SHAPE technology have converted the classic primer extension method to next generation sequencing platforms, allowing transcriptome-level analysis of RNA secondary structure. In particular, icSHAPE and SHAPE-MaP, using NAI-N3 and 1M7 reagents respectively, are methods that claim to measure in vivo structure with high-throughput sequencing. However, these compounds have not been compared on an unbiased, raw-signal level. Here, we directly compare several in vivo SHAPE acylation reagents using the simple primer extension assay...
November 22, 2016: RNA
https://www.readbyqxmd.com/read/27878822/wide-variations-in-blood-product-transfusion-practices-among-providers-who-care-for-patients-with-acute-leukemia-in-the-united-states
#16
Alexander B Pine, Eun-Ju Lee, Mikkael Sekeres, David P Steensma, Daniel Zelterman, Thomas Prebet, Amy DeZern, Rami Komrokji, Mark Litzow, Selina Luger, Richard Stone, Harry P Erba, Guillermo Garcia-Manero, Alfred I Lee, Nikolai A Podoltsev, Lisa Barbarotta, Stephanie Kasberg, Jeanne E Hendrickson, Steven D Gore, Amer M Zeidan
BACKGROUND: Transfusion of blood products is a key component of the supportive management in patients with acute leukemia (AL). However high-quality trial evidence and clinical outcome data to support specific transfusion goals for blood products for patients with AL remain limited leading to diverse transfusion practices. The primary objective of this study was to determine the spectrum of transfusion patterns in a variety of care settings among providers who treat AL patients. STUDY DESIGN AND METHODS: A 31-question survey queried providers caring for AL patients about the existence of institutional guidelines for transfusion of blood products, transfusion triggers for hemoglobin (Hb), platelets (PLTs), and fibrinogen in various settings including inpatient and outpatient and before procedures...
November 22, 2016: Transfusion
https://www.readbyqxmd.com/read/27875109/novel-reassortant-clade-2-3-4-4-avian-influenza-a-h5n8-virus-in-wild-aquatic-birds-russia-2016
#17
Dong-Hun Lee, Kirill Sharshov, David E Swayne, Olga Kurskaya, Ivan Sobolev, Marsel Kabilov, Alexander Alekseev, Victor Irza, Alexander Shestopalov
The emergence of novel avian influenza viruses in migratory birds is of concern because of the potential for virus dissemination during fall migration. We report the identification of novel highly pathogenic avian influenza viruses of subtype H5N8, clade 2.3.4.4, and their reassortment with other avian influenza viruses in waterfowl and shorebirds of Siberia.
February 15, 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/27872202/genome-wide-overexpression-screen-identifies-genes-able-to-bypass-p16-mediated-senescence-in-melanoma
#18
Won Jae Lee, Dubravka Škalamera, Mareike Dahmer-Heath, Konstanin Shakhbazov, Max V Ranall, Carly Fox, Duncan Lambie, Alexander J Stevenson, Paul Yaswen, Thomas J Gonda, Brian Gabrielli
Malignant melanomas often arise from nevi, which result from initial oncogene-induced hyperproliferation of melanocytes that are maintained in a CDKN2A/p16-mediated senescent state. Thus, genes that can bypass this senescence barrier are likely to contribute to melanoma development. We have performed a gain-of-function screen of 17,030 lentivirally expressed human open reading frames (ORFs) in a melanoma cell line containing an inducible p16 construct to identify such genes. Genes known to bypass p16-induced senescence arrest, including the human papilloma virus 18 E7 gene (HPV18E7), and genes such as the p16-binding CDK6 with expected functions, as well as panel of novel genes, were identified, including high-mobility group box (HMGB) proteins...
November 21, 2016: Journal of Biomolecular Screening
https://www.readbyqxmd.com/read/27872089/transcriptional-induction-of-periostin-by-a-sulfatase-2-tgf%C3%AE-1-smad-signaling-axis-mediates-tumor-angiogenesis-in-hepatocellular-carcinoma
#19
Gang Chen, Ikuo Nakamura, Renumathy Dhanasekaran, Eriko Iguchi, Ezequiel Tolosa, Paola Romecin-Duran, Renzo Vera, Luciana L Almada, Alexander Miamen, Roongruedee Chaiteerakij, Mengtao Zhou, Michael Asiedu, Catherine D Moser, Shaoshan Han, Chunling Hu, Bubu Banini, Abdul Oseini, Yichun Chen, Yong Fang, Dongye Yang, Hassan Shaleh, Shaoqing Wang, Dehai Wu, Tao Song, Ju-Seog Lee, Snorri S Thorgeirsson, Eric Chevet, Vijay H Shah, Martin E Fernandez-Zapico, Lewis Roberts
Existing anti-angiogenic approaches to treat metastatic hepatocellular carcinoma (HCC) are weakly effectual, prompting further study of tumor angiogenesis in this disease setting. Here we report a novel role for the sulfatase 2 (SULF2) in driving HCC angiogenesis. Sulf2-deficient mice (Sulf2 KO) exhibited resistance to diethylnitrosamine-induced HCC and did not develop metastases like wild-type mice (Sulf2 WT). The smaller and less numerous tumors formed in Sulf2 KO mice exhibited a markedly lower microvascular density...
November 21, 2016: Cancer Research
https://www.readbyqxmd.com/read/27866701/place-of-sodium-glucose-cotransporter-2-inhibitors-in-east-asian-subjects-with-type-2-diabetes-mellitus-insights-into-the-management-of-asian-phenotype
#20
REVIEW
Lee Ling Lim, Alexander Tong Boon Tan, Kevin Moses, Viraj Rajadhyaksha, Siew Pheng Chan
The burden of type 2 diabetes (T2DM) in East Asia is alarming. Rapid modernization and urbanization have led to major lifestyle changes and a tremendous increase in the prevalence of obesity, metabolic syndrome, and diabetes mellitus. The development of T2DM at a younger age, with lower body mass index, higher visceral adiposity, and more significant pancreatic beta-cell dysfunction compared to Caucasians are factors responsible for the increased prevalence of T2DM in East Asians. Sodium-glucose Cotransporter-2 (SGLT2) inhibitors (canagliflozin, dapaglifozin, empagliflozin, etc...
October 15, 2016: Journal of Diabetes and its Complications
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