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https://www.readbyqxmd.com/read/28334932/ribosome-dependent-vibrio-cholerae-mrnase-higb2-is-regulated-by-a-%C3%AE-strand-sliding-mechanism
#1
San Hadži, Abel Garcia-Pino, Sarah Haesaerts, Dukas Jurenas, Kenn Gerdes, Jurij Lah, Remy Loris
Toxin-antitoxin (TA) modules are small operons involved in bacterial stress response and persistence. higBA operons form a family of TA modules with an inverted gene organization and a toxin belonging to the RelE/ParE superfamily. Here, we present the crystal structures of chromosomally encoded Vibrio cholerae antitoxin (VcHigA2), toxin (VcHigB2) and their complex, which show significant differences in structure and mechanisms of function compared to the higBA module from plasmid Rts1, the defining member of the family...
February 28, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28334797/molecular-mechanism-governing-ratio-dependent-transcription-regulation-in-the-ccdab-operon
#2
Alexandra Vandervelde, Igor Drobnak, San Hadži, Yann G-J Sterckx, Thomas Welte, Henri De Greve, Daniel Charlier, Rouslan Efremov, Remy Loris, Jurij Lah
Bacteria can become transiently tolerant to several classes of antibiotics. This phenomenon known as persistence is regulated by small genetic elements called toxin-antitoxin modules with intricate yet often poorly understood self-regulatory features. Here, we describe the structures of molecular complexes and interactions that drive the transcription regulation of the ccdAB toxin-antitoxin module. Low specificity and affinity of the antitoxin CcdA2 for individual binding sites on the operator are enhanced by the toxin CcdB2, which bridges the CcdA2 dimers...
February 17, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28334415/opportunistic-salpingectomy-what-about-the-role-of-the-ovary-in-ovarian-cancer
#3
Goli Samimi, Lori M Minasian
No abstract text is available yet for this article.
March 23, 2017: Cancer
https://www.readbyqxmd.com/read/28333913/tuberculosis-among-foreign-born-persons-diagnosed-%C3%A2-10-years-after-arrival-in-the-united-states-2010-2015
#4
Clarisse A Tsang, Adam J Langer, Thomas R Navin, Lori R Armstrong
The majority of tuberculosis (TB) cases in the United States are attributable to reactivation of latent TB infection (LTBI) (1). LTBI refers to the condition when a person is infected with Mycobacterium tuberculosis without signs and symptoms, or radiographic or bacteriologic evidence of TB disease. CDC and the U.S. Preventive Services Task Force (USPSTF) recommend screening populations at increased risk for LTBI, including persons who have lived in congregate settings at high risk and persons who were born in, or are former residents of countries with TB incidence ≥20 cases per 100,000 population (2-4)...
March 24, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/28333235/ovarian-hormones-and-obesity
#5
Brigitte Leeners, Nori Geary, Philippe N Tobler, Lori Asarian
BACKGROUND: Obesity is caused by an imbalance between energy intake, i.e. eating and energy expenditure (EE). Severe obesity is more prevalent in women than men worldwide, and obesity pathophysiology and the resultant obesity-related disease risks differ in women and men. The underlying mechanisms are largely unknown. Pre-clinical and clinical research indicate that ovarian hormones may play a major role. OBJECTIVE AND RATIONALE: We systematically reviewed the clinical and pre-clinical literature on the effects of ovarian hormones on the physiology of adipose tissue (AT) and the regulation of AT mass by energy intake and EE...
March 2, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28332038/response-to-commentaries
#6
Lori A Brotto, Morag A Yule
No abstract text is available yet for this article.
March 22, 2017: Archives of Sexual Behavior
https://www.readbyqxmd.com/read/28332019/comparative-tissue-transcriptomics-highlights-dynamic-differences-among-tissues-but-conserved-metabolic-transcript-prioritization-in-preparation-for-arousal-from-torpor
#7
Lori K Bogren, Katharine R Grabek, Gregory S Barsh, Sandra L Martin
During the hibernation season, 13-lined ground squirrels spend days to weeks in torpor with body temperatures near freezing then spontaneously rewarm. The molecular drivers of the drastic physiological changes that orchestrate and permit torpor are not well understood. Although transcription effectively ceases at the low body temperatures of torpor, previous work has demonstrated that some transcripts are protected from bulk degradation in brown adipose tissue (BAT), consistent with the importance of their protein products for metabolic heat generation during arousal from torpor...
March 23, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28331065/urothelial-proliferation-and-regeneration-after-spinal-cord-injury
#8
F Aura Kullmann, Dennis R Clayton, Wily G Ruiz, Amanda Wolf-Johnson, Christian Gauthier, Anthony J Kanai, Lori A Birder, Gerard Apodaca
The basal, intermediate, and superficial cell layers of the urothelium undergo rapid and complete recovery following acute injury; however, the effects of chronic injury on urothelial regeneration have not been well defined. To address this discrepancy, we employed a mouse model to explore urothelial changes in response to spinal cord injury (SCI), a condition characterized by life-long bladder dysfunction. One-day post SCI there was a focal loss of umbrella cells, which are large cells that populate the superficial cell layer and normally express uroplakins (UPKs) and KRT20, but not KRT5, KRT14, or TP63...
March 22, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28330856/-my-friend-who-bought-it-for-me-she-has-had-an-abortion-before-the-influence-of-ghanaian-women-s-social-networks-in-determining-the-pathway-to-induced-abortion
#9
Sarah D Rominski, Jody R Lori, Emmanuel Sk Morhe
BACKGROUND: Even given the liberal abortion law in Ghana, abortion complications are a large contributor to maternal morbidity and mortality. This study sought to understand why young women seeking an abortion in a legally enabling environment chose to do this outside the formal healthcare system. METHODS: Women being treated for complications arising from a self-induced abortion as well as for elective abortions at three hospitals in Ghana were interviewed. Community-based focus groups were held with women as well as men, separately...
March 22, 2017: Journal of Family Planning and Reproductive Health Care
https://www.readbyqxmd.com/read/28330604/stable-and-potent-selenomab-drug-conjugates
#10
Xiuling Li, Christopher G Nelson, Rajesh R Nair, Lori Hazlehurst, Tina Moroni, Pablo Martinez-Acedo, Alex R Nanna, David Hymel, Terrence R Burke, Christoph Rader
Selenomabs are engineered monoclonal antibodies with one or more translationally incorporated selenocysteine residues. The unique reactivity of the selenol group of selenocysteine permits site-specific conjugation of drugs. Compared with other natural and unnatural amino acid and carbohydrate residues that have been used for the generation of site-specific antibody-drug conjugates, selenocysteine is particularly reactive, permitting fast, single-step, and efficient reactions under near physiological conditions...
March 9, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28329814/increased-engagement-with-life-differences-in-the-cognitive-physical-social-and-spiritual-activities-of-older-adult-music-listeners
#11
Christopher N Kaufmann, Lori P Montross-Thomas, Sean Griser
Purpose of the Study: Clinical studies have demonstrated the health benefits of music listening, especially among older adults; however, this connection has not yet been examined in a nationally representative population based sample. The purpose of this study was to measure the connections between health, listening to music, and engagement with life activities among older Americans. Design and Methods: We used data on 5,797 participants in both the 2012 Health and Retirement Study and 2013 Consumption and Activities Mail Survey...
January 21, 2017: Gerontologist
https://www.readbyqxmd.com/read/28329784/age-related-increases-in-verbal-knowledge-are-not-associated-with-word-finding-problems-in-the-cam-can-cohort-what-you-know-won-t-hurt-you
#12
Meredith A Shafto, Lori E James, Lise Abrams, Lorraine K Tyler
Objective: We tested the claim that age-related increases in knowledge interfere with word retrieval, leading to word finding failures. We did this by relating a measure of crystallized intelligence to tip-of-the-tongue (TOT) states and picture naming accuracy. Method: Participants were from a large (N = 708), cross-sectional (aged 18-88 years), population-based sample from the Cambridge Centre for Ageing and Neuroscience cohort (Cam-CAN; www.cam-can.com). They completed (a) the Spot-the-Word Test (STW), a measure of crystallized intelligence in which participants circled the real word in word/nonword pairs, (b) a TOT-inducing task, and (c) a picture naming task...
June 30, 2016: Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
https://www.readbyqxmd.com/read/28328564/variation-in-national-acgme-case-log-data-for-pediatric-orthopaedic-fellowships-are-fellow-coding-practices-responsible
#13
Philip K McClure, Marcella Woiczik, Lori Karol, Wudbhav N Sankar
BACKGROUND: The introduction of the 80-hour work week for Accreditation Council for Graduate Medical Education (ACGME) accredited fellowship programs initiated many efforts to optimize surgical training. One particular area of interest is on recording and tracking surgical experiences. The current standard is logging cases based on Current Procedural Terminology codes, which are primarily designed for billing. Proposed guidelines from the ACGME regarding logging exist, but their implementation is unknown, as is the variation in case volume across fellowship programs...
March 21, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28328302/pembrolizumab-for-platinum-and-cetuximab-refractory-head-and-neck-cancer-results-from-a-single-arm-phase-ii-study
#14
Joshua Bauml, Tanguy Y Seiwert, David G Pfister, Francis Worden, Stephen V Liu, Jill Gilbert, Nabil F Saba, Jared Weiss, Lori Wirth, Ammar Sukari, Hyunseok Kang, Michael K Gibson, Erminia Massarelli, Steven Powell, Amy Meister, Xinxin Shu, Jonathan D Cheng, Robert Haddad
Purpose There are no approved treatments for recurrent/metastatic head and neck squamous cell carcinoma refractory to platinum and cetuximab. In the single-arm, phase II KEYNOTE-055 study, we evaluated pembrolizumab, an anti-programmed death 1 receptor antibody, in this platinum- and cetuximab-pretreated population with poor prognosis. Methods Eligibility stipulated disease progression within 6 months of platinum and cetuximab treatment. Patients received pembrolizumab 200 mg every 3 weeks. Imaging was performed every 6 to 9 weeks...
March 22, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28326560/sex-chromosome-aneuploidy-detection-by-non-invasive-prenatal-testing-helpful-or-hazardous
#15
Rosemary E Reiss, Marie Discenza, Judith Foster, Lori Dobson, Louise Wilkins-Haug
OBJECTIVES: To assess the incidence of sex chromosome aneuploidy (SCA) predicted by non-invasive prenatal testing (NIPT), assess test performance, and compare it with nuchal translucency (NT) screening among patients seen in our prenatal diagnosis center. METHODS: We identified suspected cases of SCA by reviewing results from all NIPT samples sent from our center to commercial laboratories offering analysis by cell-free DNA between December 1, 2012 to July 31, 2015...
March 21, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28325391/instruction-in-teaching-and-teaching-opportunities-for-residents-in-us-dermatology-programs-results-of-a-national-survey
#16
Susan Burgin, Gelareh Homayounfar, Lori R Newman, Amy Sullivan
BACKGROUND: Dermatology residents routinely teach junior co-residents and medical students. Despite the importance of teaching skills for a successful academic career, no formal teaching instruction programs for dermatology residents have been described to our knowledge, and the extent of teaching opportunities for dermatology residents is unknown. OBJECTIVE: We sought to describe the range of teaching opportunities and instruction available to dermatology residents and to assess the need for additional teaching training from the perspective of dermatology residency program directors nationwide...
April 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28324865/biomaterials-for-intervertebral-disc-regeneration-and-repair
#17
REVIEW
Robert D Bowles, Lori A Setton
The intervertebral disc contributes to motion, weight bearing, and flexibility of the spine, but is susceptible to damage and morphological changes that contribute to pathology with age and injury. Engineering strategies that rely upon synthetic materials or composite implants that do not interface with the biological components of the disc have not met with widespread use or desirable outcomes in the treatment of intervertebral disc pathology. Here we review bioengineering advances to treat disc disorders, using cell-supplemented materials, or acellular, biologically based materials, that provide opportunity for cell-material interactions and remodeling in the treatment of intervertebral disc disorders...
March 15, 2017: Biomaterials
https://www.readbyqxmd.com/read/28322202/genetic-epistasis-regulates-amyloid-deposition-in-resilient-aging
#18
Daniel Felsky, Jishu Xu, Lori Chibnik, Julie Schneider, Jo Knight, James L Kennedy, David A Bennett, Philip L De Jager, Aristotle N Voineskos
INTRODUCTION: The brain-derived neurotrophic factor (BDNF) interacts with important genetic Alzheimer's disease (AD) risk factors. Specifically, variants within the SORL1 gene determine BDNF's ability to reduce amyloid β (Aβ) in vitro. We sought to test whether functional BDNF variation interacts with SORL1 genotypes to influence expression and downstream AD-related processes in humans. METHODS: We analyzed postmortem brain RNA sequencing and neuropathological data for 441 subjects from the Religious Orders Study/Memory and Aging Project and molecular and structural neuroimaging data for 1285 subjects from the Alzheimer's Disease Neuroimaging Initiative...
March 16, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28321233/heterogeneity-of-the-pancreatic-beta-cell
#19
REVIEW
Giselle Dominguez Gutierrez, Jesper Gromada, Lori Sussel
The pancreatic beta cell functions as a key regulator of blood glucose levels by integrating a variety of signals in response to changing metabolic demands. Variations in beta cell identity that translate into functionally different subpopulations represent an interesting mechanism to allow beta cells to efficiently respond to diverse physiological and pathophysiological conditions. Recently, there is emerging evidence that morphological and functional differences between beta cells exist. Furthermore, the ability of novel single cell technologies to characterize the molecular identity of individual beta cells has created a new era in the beta cell field...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28320616/high-content-screen-using-zebrafish-danio-rerio-embryos-identifies-a-novel-kinase-activator-and-inhibitor
#20
Werner J Geldenhuys, Sadie A Bergeron, Jackie E Mullins, Rowaa Aljammal, Briah L Gaasch, Wei-Chi Chen, June Yun, Lori A Hazlehurst
In this report we utilized zebrafish (Danio rerio) embryos in a phenotypical high-content screen (HCS) to identify novel leads in a cancer drug discovery program. We initially validated our HCS model using the flavin adenosine dinucleotide (FAD) containing endoplasmic reticulum (ER) enzyme, endoplasmic reticulum oxidoreductase (ERO1) inhibitor EN460. EN460 showed a dose response effect on the embryos with a dose of 10μM being significantly lethal during early embryonic development. The HCS campaign which employed a small library identified a promising lead compound, a naphthyl-benzoic acid derivative coined compound 1 which had significant dosage and temporally dependent effects on notochord and muscle development in zebrafish embryos...
February 28, 2017: Bioorganic & Medicinal Chemistry Letters
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