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https://www.readbyqxmd.com/read/28326615/using-passive-sampling-and-zebrafish-to-identify-developmental-toxicants-in-complex-mixtures
#1
Alan J Bergmann, Robert L Tanguay, Kim A Anderson
Using effects-directed analysis (EDA), we investigate associations previously observed between PAHs and embryotoxicity in field-deployed low-density polyethylene (LDPE). We conducted EDA using a zebrafish embryo assay and iterative fractionation of extracts of LDPE that were deployed in Portland Harbor Superfund Megasite, Oregon. Whole extracts induced toxicity including mortality, edema, and notochord distortion at EC20s of approximately 100, 100, and 10 mg LDPE/mL, respectively. Through fractionation, we determined that PAHs at concentrations similar to previous research did not contribute markedly to toxicity...
March 22, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28288313/photo-induced-oxidative-damage-to-dissolved-free-amino-acids-by-the-photosensitizer-polycyclic-musk-tonalide-transformation-kinetics-and-mechanisms
#2
Hansun Fang, Yanpeng Gao, Honghong Wang, Hongliang Yin, Guiying Li, Taicheng An
Residue from the polycyclic musks (PCMs) in household and personal care products may harm human beings through skin exposure. To understand the health effects of PCMs when exposed to sunlight at molecular level, both experimental and computational methods were employed to investigate the photosensitized oxidation performance of 19 natural amino acids, the most basic unit of life. Results showed that a typical PCM, tonalide, acts as a photosensitizer to significantly increase photo-induced oxidative damage to amino acids...
March 6, 2017: Water Research
https://www.readbyqxmd.com/read/28284351/is-musk-myasthenia-gravis-linked-to-igg4-related-disease
#3
Pooja Raibagkar, Judith A Ferry, John H Stone
Immunoglobulin (Ig) G4-related disease (IgG4-RD) is an immune-mediated inflammatory condition that affects a wide variety of sites, including the nervous system, where it can involve the meninges or the pituitary gland, and cause perineural mass lesions. A large subset of acetylcholine receptor antibody (Ab)-negative myasthenia gravis (MG) patients has muscle-specific tyrosine kinase (MuSK) Abs, generally of the IgG4 subclass. There has not been any association found between IgG4-RD and MuSK MG yet. We report the first case of MuSK MG associated with lymphadenopathy with histopathology consistent with IgG4-RD...
April 15, 2017: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/28273460/agrin-as-a-mechanotransduction-signal-regulating-yap-through-the-hippo-pathway
#4
Sayan Chakraborty, Kizito Njah, Ajaybabu V Pobbati, Ying Bena Lim, Anandhkumar Raju, Manikandan Lakshmanan, Vinay Tergaonkar, Chwee Teck Lim, Wanjin Hong
The Hippo pathway effectors YAP and TAZ act as nuclear sensors of mechanical signals in response to extracellular matrix (ECM) cues. However, the identity and nature of regulators in the ECM and the precise pathways relaying mechanoresponsive signals into intracellular sensors remain unclear. Here, we uncover a functional link between the ECM proteoglycan Agrin and the transcriptional co-activator YAP. Importantly, Agrin transduces matrix and cellular rigidity signals that enhance stability and mechanoactivity of YAP through the integrin-focal adhesion- and Lrp4/MuSK receptor-mediated signaling pathways...
March 7, 2017: Cell Reports
https://www.readbyqxmd.com/read/28259185/musk-gland-seasonal-development-and-musk-secretion-are-regulated-by-the-testis-in-muskrat-ondatra-zibethicus
#5
Tianxiang Zhang, Dong Peng, Lei Qi, Weixuan Li, Mengyuan Fan, Jiachen Shen, Liangliang Yang, Yihua Wang, Wenxia Wang, Xiaolong Hu, Ruibo Cai, Ran Zhou, Yuting Wei, Juntong Zhou, Shuang Yang, Defu Hu, Shuqiang Liu
BACKGROUND: The muskrat is a seasonal breeder. Males secrete musk to attract females during the breeding season. The testosterone binding to the androgen receptor (AR) in musk glands of muskrat may play an important role conducting the musk secretion process. METHODS: The musk gland, testis and blood samples of musk rats are collected in both breeding and non-breeding seasons. Some part of the samples are kept in liquid nitrogen for transcriptome analysis and Western blotting test...
March 4, 2017: Biological Research
https://www.readbyqxmd.com/read/28249739/dermal-absorption-of-semivolatile-organic-compounds-from-the-gas-phase-sensitivity-of-exposure-assessment-by-steady-state-modeling-to-key-parameters
#6
Maud Pelletier, Nathalie Bonvallot, Olivier Ramalho, Olivier Blanchard, Fabien Mercier, Corinne Mandin, Barbara Le Bot, Philippe Glorennec
Recent research has demonstrated the importance of dermal exposure for some semivolatile organic compounds (SVOCs) present in the gas phase of indoor air. Though models for estimating dermal intake from gaseous SVOCs exist, their predictions can be subject to variations in input parameters, which can lead to large variation in exposure estimations. In this sensitivity analysis for a steady state model, we aimed to assess these variations and their determinants using probabilistic Monte Carlo sampling for 8 SVOCs from different chemical families: phthalates, bisphenols, polycyclic aromatic hydrocarbons (PAHs), organophosphorus (OPs), organochlorines (OCs), synthetic musks, polychlorinated biphenyls (PCBs) and polybromodiphenylethers (PBDEs)...
February 26, 2017: Environment International
https://www.readbyqxmd.com/read/28244606/risk-factors-for-malignant-mesothelioma-in-people-with-no-known-exposure-to-asbestos
#7
Bill Musk, Len Gordon, Helman Alfonso, Alison Reid, Nola Olsen, Robin Mina, Peter Franklin, Susan Peters, Fraser Brims, Jennie Hui, Nicholas de Klerk
OBJECTIVES: Malignant mesothelioma (MM) is a rare and generally fatal cancer, usually caused by asbestos, although about 5-10% of cases report no asbestos exposure. This study aimed to identify sources whereby people in Western Australia (WA) may be unknowingly exposed to asbestos or to other exposures which may cause MM. METHODS: Cases with no known asbestos exposure were selected from the WA Mesothelioma Register (WAMR). Matched controls were selected from hospital patients admitted for conditions unrelated to asbestos...
February 28, 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/28238572/seronegative-myasthenia-gravis-associated-with-malignant-thymoma
#8
Jason Richards, James F Howard
Myasthenia gravis (MG) is generally caused by antibodies directed against the neuromuscular junction, including antibodies against the postsynaptic nicotinic acetylcholine receptor (AChR). Pathologic abnormalities of the thymus gland, including thymoma, are associated with MG. We report a 56-year-old woman who presented with double vision. Single fiber EMG confirmed myasthenia gravis. AChR, striational muscle and MuSK antibodies were absent in the serum. Chest CT demonstrated a malignant thymoma. We report the first case of seronegative myasthenia gravis associated with malignant thymoma...
February 2, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28217268/anti-musk-positive-myasthenia-gravis-and-three-semiological-cardinal-signs
#9
André P C Matta, Ana C Andorinho F Ferreira, Arielle Kirmse, Anna Carolina Damm, João Gabriel D I B Farinhas, Mariane D Barbosa, Mayara C M Teles, Camila Fiorelli, Rossano Fiorelli, Osvaldo J M Nascimento, Marco Orsini
Myasthenia gravis (MG) is a relatively uncommon disorder with an annual incidence of approximately 7 to 9 new cases per million. The prevalence is about 70 to 165 per million. The prevalence of the disease has been increasing over the past five decades. This is thought to be due to better recognition of the condition, aging of the population, and the longer life span of affected patients. MG causes weakness, predominantly in bulbar, facial, and extra-ocular muscles, often fluctuating over minutes to weeks, in the absence of wasting, sensory loss, or reflex changes...
November 2, 2016: Neurology International
https://www.readbyqxmd.com/read/28196068/comparison-of-outcomes-following-a-cytological-or-histological-diagnosis-of-malignant-mesothelioma
#10
Sanjeevan Muruganandan, Helman Alfonso, Peter Franklin, Keith Shilkin, Amanda Segal, Nola Olsen, Alison Reid, Nick de Klerk, Aw Bill Musk, Fraser Brims
BACKGROUND: Survival with the epithelioid subtype of malignant mesothelioma (MM) is longer than the biphasic or sarcomatoid subtypes. There is concern that cytology-diagnosed epithelioid MM may underdiagnose the biphasic subtype. This study examines survival differences between patients with epithelioid MM diagnosed by cytology only and other subtypes diagnosed by histology. METHODS: Demographics, diagnosis method, MM subtype and survival were extracted from the Western Australia (WA) Mesothelioma Registry, which records details of all MM cases occurring in WA...
March 14, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28186707/mesenchymal-stromal-cell-therapy-for-chronic-lung-allograft-dysfunction-results-of-a-first-in-man-study
#11
Daniel C Chambers, Debra Enever, Sharon Lawrence, Marian J Sturm, Richard Herrmann, Stephanie Yerkovich, Michael Musk, Peter M A Hopkins
Chronic lung transplant rejection (termed chronic lung allograft dysfunction [CLAD]) is the main impediment to long-term survival after lung transplantation. Bone marrow-derived mesenchymal stromal cells (MSCs) represent an attractive cell therapy in inflammatory diseases, including organ rejection, given their relative immune privilege and immunosuppressive and tolerogenic properties. Preclinical studies in models of obliterative bronchiolitis and human trials in graft versus host disease and renal transplantation suggest potential efficacy in CLAD...
February 1, 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28178923/non-neuronal-cholinergic-activity-is-potentiated-in-myasthenia-gravis
#12
Bin Han, Chao Zhang, Shoufeng Liu, Yiping Xia, Hao Sun, Zhongying Gong, Alain R Simard, Qiang Liu, Junwei Hao
BACKGROUND: Non-neuronal acetylcholine (ACh) restricts autoimmune responses and attenuates inflammation by cholinergic anti-inflammation pathway. To date, the implication of ACh in myasthenia gravis (MG) remained unexplored. This study aimed to investigate the possible relationship between ACh levels, anti-muscle-specific tyrosine kinase (MuSK) antibody titers, main clinical features and outcomes of MG patients. METHODS: We successfully measured ACh levels in human peripheral blood mononuclear cells (PBMCs) from 125 MG patients and 50 matched healthy controls by using ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS)...
February 8, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28174340/genetic-variants-affecting-cross-sectional-lung-function-in-adults-show-little-or-no-effect-on-longitudinal-lung-function-decline
#13
Catherine John, María Soler Artigas, Jennie Hui, Sune Fallgaard Nielsen, Nicholas Rafaels, Peter D Paré, Nadia N Hansel, Nick Shrine, Iain Kilty, Anders Malarstig, Scott A Jelinsky, Signe Vedel-Krogh, Kathleen Barnes, Ian P Hall, John Beilby, Arthur W Musk, Børge G Nordestgaard, Alan James, Louise V Wain, Martin D Tobin
BACKGROUND: Genome-wide association studies have identified numerous genetic regions that influence cross-sectional lung function. Longitudinal decline in lung function also includes a heritable component but the genetic determinants have yet to be defined. OBJECTIVES: We aimed to determine whether regions associated with cross-sectional lung function were also associated with longitudinal decline and to seek novel variants which influence decline. METHODS: We analysed genome-wide data from 4167 individuals from the Busselton Health Study cohort, who had undergone spirometry (12 695 observations across eight time points)...
February 7, 2017: Thorax
https://www.readbyqxmd.com/read/28174114/health-risk-benefit-information-for-consumers-of-fish-and-shellfish-fishchoice-a-new-online-tool
#14
Lolita Vilavert, Ferran Borrell, Martí Nadal, Silke Jacobs, Fien Minnens, Wim Verbeke, António Marques, José Luis Domingo
It is well known that due to the content in omega-3 fatty acids, consumption of fish and shellfish is beneficial for human cardiovascular health. However, a number of recent studies have shown that fish consumption may be also a potential dietary source of exposure to various environmental pollutants with well-known potential adverse effects on human health. Moreover, there is still a lack of information regarding levels of emerging contaminants in fish and shellfish, in particular among consumers and stakeholders...
February 5, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28164324/rituximab-treatment-of-myasthenia-gravis-a-systematic-review
#15
REVIEW
Rup Tandan, Michael K Hehir, Waqar Waheed, Diantha B Howard
Rituximab is a chimeric mouse/human anti-CD20 monoclonal immunoglobulin. We reviewed the efficacy and safety of rituximab in 169 myasthenia gravis (MG) patients from case reports and series. Antibodies to the acetylcholine receptor (AChR) were present in 59% and muscle-specific tyrosine kinase (MuSK) in 34%. Modified Myasthenia Gravis Foundation of America postintervention scale of minimal manifestations (MM) or better occurred in 44%, and combined pharmacologic and chronic stable remission in 27% overall; MM or better was achieved in 72% of MuSK MG and 30% of AChR MG (P < 0...
February 6, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28154466/nasopharyngeal-temperature-measurement-in-sheep-during-general-anesthesia
#16
Tabita Tan, Jonathon Tuke, Gabrielle C Musk
The aim of this study was to compare nasopharyngeal and esophageal temperature measurements in anesthetized sheep with a range of fresh gas flows (1 to 6 L/min) through the breathing system. Data were compared using a Bland-Altman plot and correlation coefficients, and error measures were calculated. One hundred and ninety-five sets of data were collected from 20 sheep weighing 41 kg (31 to 51.5 kg). The bias (95% limit of agreement), correlation coefficient, and absolute error for nasopharyngeal compared to esophageal temperature were 0...
January 2017: Canadian Journal of Veterinary Research, Revue Canadienne de Recherche Vétérinaire
https://www.readbyqxmd.com/read/28145478/comparison-of-amino-acid-profiles-and-metabolic-gene-expression-in-muskrat-scented-glands-in-secretion-and-non-secretion-season
#17
Yimeng Li, Tianxiang Zhang, Mengyuan Fan, Juntong Zhou, Shuang Yang, Meishan Zhang, Lei Qi, Shaobi Lin, Defu Hu, Shuqiang Liu
The scented gland is an organ responsible for producing musk in muskrats. During musk secretion season, the metabolism of glandular cells increases in the scented glands and a large amount of musk is synthesised. In this study, we collected scented gland arterial blood from six healthy adult male muskrats during non-secretion season (November). We also obtained scented gland arterial blood, venous blood, and musk from six healthy adult males during secretion season (March). Qualitative and quantitative analyses of free amino acids in blood and musk were performed with an automated amino acid analyzer...
February 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28129620/in%C3%A2-vitro-determination-of-transdermal-permeation-of-synthetic-musks-and-estimated-dermal-uptake-through-usage-of-personal-care-products
#18
Xiaolan Zhang, Yuling Yu, Yue Gu, Xiaojing Li, Xinyu Zhang, Yingxin Yu
Synthetic musks, chemical constituents of personal care products, enter the human body through dermal contact. Elucidation of the mechanisms underlying transdermal permeation of synthetic musks should enhance our understanding of their uptake and distribution in human skin and allow accurate evaluation of associated human exposure. Here, the transdermal permeation dynamics and distribution of galaxolide (HHCB) and tonalide (AHTN) were investigated using an in vitro skin diffusion model. The transdermal permeation amounts of HHCB and AHTN increased rapidly during the first 6 h...
January 19, 2017: Chemosphere
https://www.readbyqxmd.com/read/28127106/comparative-anatomy-of-gastrin-releasing-peptide-pathways-in-the-trigeminal-sensory-system-of-mouse-and-the-asian-house-musk-shrew-suncus-murinus
#19
Keiko Takanami, Kaihei Inoue, Hiroki Mukai, Kei Tamura, Takamichi Jogahara, Sen-Ichi Oda, Mitsuhiro Kawata, Tatsuya Sakamoto, Hirotaka Sakamoto
Gastrin-releasing peptide (GRP) has recently been identified as an itch-signaling molecule in the primary afferents and spinal cord of rodents. However, little information exists on the expression and localization of GRP in the trigeminal somatosensory system other than in rats. We examined the generality of the trigeminal GRP system in mammals using two distinct species, suncus as a model of specialized placental mammals known to have a well-developed trigeminal sensory system and mice as a representative small laboratory animal...
December 28, 2016: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/28120411/electrical-stimulation-delays-reinnervation-in-denervated-rat-muscle
#20
Clara M Pinheiro-Dardis, Bruna T Erbereli, Davilene Gigo-Benato, Paula A T S Castro, Thiago L Russo
INTRODUCTION: It is not clear if electrical stimulation (ES) can affect muscle reinnervation. This study aimed to verify if ES affects neuromuscular recovery after nerve crush injury in rats. METHODS: Denervated muscles were electrically stimulated daily for 6 or 14 days. Neuromuscular performance and excitability, and muscle morphology were determined. Muscle trophism markers (atrogin-1, MuRF-1, and myoD), as well as neuromuscular junction (NMJ) organization (MuSK, Dok-7, nAChR, and N-CAM) were assessed...
January 24, 2017: Muscle & Nerve
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