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https://www.readbyqxmd.com/read/28107975/comparison-of-sample-preparation-strategies-for-target-analysis-of-total-thyroid-hormones-levels-in-serum-by-liquid-chromatography-quadrupole-time-of-flight-mass-spectrometry
#1
E Álvarez, Y Madrid, M D Marazuela
This paper describes a novel method based on liquid chromatography quadrupole time-of-flight-mass spectrometry (LC-QTOF-MS) for target analysis of total THs in serum. Several sample preparation strategies have been evaluated to reduce matrix effect (namely, HybridSPE cartridges, supported liquid extraction, SLE and solid phase extraction, SPE). Deproteinization and further clean-up with mixed-mode SPE was selected as the best strategy for sample preparation, since achieved the cleanest extracts and reduced ionization suppression effects (between -11 and -24%)...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107906/development-of-data-independent-acquisition-workflows-for-metabolomic-analysis-on-a-quadrupole-orbitrap-platform
#2
Juntuo Zhou, Yuhua Li, Xi Chen, Lijun Zhong, Yuxin Yin
Untargeted metabolomic profiling has been widely used in recent years. However, the low reproducibility of the data-dependent acquisition (DDA) strategy presents a major bottleneck that considerably limits the reliability of metabolomic studies in biological and clinical research. The data-independent acquisition (DIA) strategy is proposed to solve the above-mentioned problem, and it is gaining popularity. This paper presents a novel approach for performing metabolomic analysis using an untargeted, liquid chromatography-data independent-mass spectrometry (LC-DIA-MS) strategy on a quadrupole-Orbitrap platform...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28042737/thyroid-hormone-level-is-associated-with-the-frequency-and-severity-of-guillain-barr%C3%A3-syndrome
#3
Yuanyuan Huang, Zhaojian Ying, Zhibo Chen, Weiwei Xiang, Zhongqian Su, Weiwei Quan, Yiyun Weng, Xu Zhang
OBJECTIVE: Guillain-Barré syndrome (GBS) is a neurodegenerative and inflammatory demyelination disorder, and oxidative stress is concerned with the pathogenesis of the disease. Also we found that thyroid hormone level is correlated to the oxidative and antioxidant status in previous studies. Our study was aimed to find the possible relationship between the frequency and severity of GBS and thyroid hormone levels. MATERIALS AND METHODS: We measured serum levels of thyroid stimulating hormone (TSH), free thyroxine (FT4) and free triiodothyronine (FT3) in 238 individuals, including 90 GBS, 44 multiple sclerosis (MS) and 104 healthy controls...
January 2, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28025523/development-of-a-uplc-tq-ms-approach-for-the-determination-of-eleven-bioactive-components-in-haizao-yuhu-decoction-plus-minus-haizao-and-gancao-drug-combination-after-oral-administration-in-a-rat-model-of-hypothyroidism
#4
Yingchang Ma, Yang Zhang, Yuanjuan Zhai, Zhenhua Zhu, Ying Pan, Dawei Qian, Shulan Su, Xinsheng Fan, Jinao Duan
Haizao Yuhu Decoction (HYD) has been used for approximately 500 years and is well-known in Traditional Chinese Medicine for its efficacy in the treatment of thyroid-related diseases. In this study, a rapid liquid chromatography-tandem mass spectrometry method was developed for the determination of liquiritin, naringin, hesperidin, peimine, liquiritigenin, glycyrrhizic acid, bergapten, nobiletin, osthole, and glycyrrhetinic acid in rat plasma to investigate the pharmacokinetic profile of different HYD prescriptions in a rat model of hypothyroidism...
December 22, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28024262/levothyroxine-sodium-revisited-a-wholistic-structural-elucidation-approach-of-new-impurities-via-hplc-hrms-ms-on-line-h-d-exchange-nmr-spectroscopy-and-chemical-synthesis
#5
M Ruggenthaler, J Grass, W Schuh, C G Huber, R J Reischl
The structural elucidation of unknown pharmaceutical impurities plays an important role in the quality control of newly developed and well-established active pharmaceutical ingredients (APIs). The United States Pharmacopeia (USP) monograph for the API Levothyroxine Sodium, a synthetic thyroid hormone, features two high pressure liquid chromatography (HPLC) methods using UV-VIS absorption detection to determine organic impurities in the drug substance. The impurity profile of the first USP method ("Procedure 1") has already been extensively studied, however for the second method ("Procedure 2"), which exhibits a significantly different impurity profile, no wholistic structural elucidation of impurities has been performed yet...
December 14, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28012382/a-validated-lc-ms-ms-method-for-thyroid-hormone-determination-in-sea-lamprey-petromyzon-marinus-plasma-gill-kidney-and-liver
#6
Ugo Bussy, Yu-Wen Chung-Davidson, Ke Li, Skye D Fissette, Ethan G Buchinger, Weiming Li
A UPLC-MS/MS method was developed to provide a reproducible, sensitive and quantitative assay to determine thyroid hormones in sea lamprey tissues and plasma. l-Thyroxine (T4) and its two triiodo-thyronine isomers have been simultaneously quantified and validated for plasma, gill, liver, and kidney matrices. Multiple sample preparation techniques were investigated to achieve optimal sample matrix digestion and clean-up. Enzymatic digestion followed by protein precipitation was selected to process the samples...
January 15, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27994680/association-between-the-kras-gene-polymorphisms-and-papillary-thyroid-carcinoma-in-a-chinese-han-population
#7
Lifeng Ning, Wenwang Rao, Yaqin Yu, Xiaoli Liu, Yuchen Pan, Yuan Ma, Rui Liu, Shangchao Zhang, Hui Sun, Qiong Yu
Several studies have reported the association between MAPK signaling pathway gene polymorphisms and papillary thyroid carcinoma (PTC). KRAS gene, an oncogene from the mammalian RAS gene family plays an important role in the MAPK pathway. This study aimed to identify the potential association of KRAS gene polymorphisms with susceptibility to PTC in a Han Chinese population. A total of 861 patients with PTC, 562 disease controls with nodular goiter and 897 healthy controls were recruited. Four tagSNP polymorphisms (rs12427141, rs712, rs7315339 and rs7960917) of KRAS gene were genotyped by matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS)...
2016: Journal of Cancer
https://www.readbyqxmd.com/read/27939607/proteomic-profiles-of-thyroid-tumors-by-mass-spectrometry-imaging-on-tissue-microarrays
#8
Manuel Galli, Fabio Pagni, Gabriele De Sio, Andrew Smith, Clizia Chinello, Martina Stella, Vincenzo L'Imperio, Marco Manzoni, Mattia Garancini, Diego Massimini, Niccolò Mosele, Giancarlo Mauri, Italo Zoppis, Fulvio Magni
The current study proposes the successful use of a mass spectrometry-imaging technology that explores the composition of biomolecules and their spatial distribution directly on-tissue to differentially classify benign and malignant cases, as well as different histotypes. To identify new specific markers, we investigated with this technology a wide histological Tissue Microarray (TMA)-based thyroid lesion series. Results showed specific protein signatures for malignant and benign specimens and allowed to build clusters comprising several proteins with discriminant capabilities...
December 9, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27904656/the-berlin-treatment-algorithm-recommendations-for-tailored-innovative-therapeutic-strategies-for-multiple-sclerosis-related-fatigue
#9
REVIEW
Christian Veauthier, Helge Hasselmann, Stefan M Gold, Friedemann Paul
More than 80% of multiple sclerosis (MS) patients suffer from fatigue. Despite this, there are few therapeutic options and evidence-based pharmacological treatments are lacking. The associated societal burden is substantial (MS fatigue is a major reason for part-time employment or early retirement), and at least one out of four MS patients view fatigue as the most burdensome symptom of their disease. The mechanisms underlying MS-related fatigue are poorly understood, and objective criteria for distinguishing and evaluating levels of fatigue and tiredness have not yet been developed...
2016: EPMA Journal
https://www.readbyqxmd.com/read/27861937/electrophysiological-identification-of-nonrecurrent-laryngeal-nerves
#10
Emad Kandil, Muhammad A Anwar, Jeremy Bamford, Rizwan Aslam, Gregory W Randolph
OBJECTIVES/HYPOTHESIS: The nonrecurrent laryngeal nerve (NRLN) is a common anatomic variation of the right recurrent laryngeal nerve (RLN), which has been associated with an increased risk of injury during thyroid and parathyroid surgery. We suggest that early successful identification using intraoperative nerve monitoring (IONM) and preservation of this variant will help the surgeon to avoid injury to this nerve. Our objective was to examine the electrophysiological parameters of the NRLN and the efficacy of IONM for successful identification of the NRLN...
November 15, 2016: Laryngoscope
https://www.readbyqxmd.com/read/27833448/a-possible-link-between-the-epstein-barr-virus-infection-and-autoimmune-thyroid-disorders
#11
REVIEW
Anna Dittfeld, Katarzyna Gwizdek, Marek Michalski, Romuald Wojnicz
The Epstein-Barr virus (EBV), also known as human herpesvirus 4, is a member of the Herpesviridae virus family. EBV infection can cause infectious mononucleosis (IM) in the lytic phase of EBV's life cycle. Past EBV infection is associated with lymphomas, and may also result in certain allergic and autoimmune diseases. Although potential mechanisms of autoimmune diseases have not been clearly elucidated, both genetic and environmental factors, such as infectious agents, are considered to be responsible for their development...
2016: Central-European Journal of Immunology
https://www.readbyqxmd.com/read/27831763/thyroid-patient-salivary-radioiodine-transit-and-dysfunction-assessment-using-chewing-gums
#12
Demetrios Okkalides
Radiation-induced salivary gland dysfunction is the most frequent side-effect of I-131 thyroid therapy. Here, a novel saliva sampling method with ordinary chewing gums administered to the patients at appropriate time intervals post-treatment (TIPT) was used to relate this effect to chewing gum saliva activity (CGSA) content. Saliva samples were acquired after the oral administration of prescribed I-131 activity (radioactivity administered [RA]) to 19 differentiated thyroid cancer (DTC) and 16 hyperthyroidism patients of the radioisotope unit (RIU) during 2014 and 2015...
November 2016: Cancer Biotherapy & Radiopharmaceuticals
https://www.readbyqxmd.com/read/27812786/the-functional-role-of-the-pharyngeal-plexus-in-vocal-cord-innervation-in-humans
#13
Mehmet Uludag, Nurcihan Aygun, Adnan Isgor
Classical understanding of the function of the pharyngeal plexus in humans is that it relies on both motor branches for innervation of the majority of pharyngeal muscles and sensory branches for the pharyngeal wall sensation. To date there has been no reported data on the role of the pharyngeal plexus in vocal cord innervation. The aim of this study is to evaluate whether or not the plexus pharyngeus contributes to the innervation of the vocal cords. One hundred twenty-five sides from 79 patients (59 female, 20 male) undergoing thyroid surgery with intraoperative neuromonitoring were prospectively evaluated...
November 3, 2016: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/27782388/ambient-ionization-and-faims-mass-spectrometry-for-enhanced-imaging-of-multiply-charged-molecular-ions-in-biological-tissues
#14
Clara L Feider, Natalia Elizondo, Livia S Eberlin
Ambient ionization mass spectrometry imaging (MSI) has been increasingly used to investigate the molecular distribution of biological tissue samples. Here, we report the integration and optimization of desorption electrospray ionization (DESI) and liquid-microjunction surface sampling probe (LMJ-SSP) with a chip-based high-field asymmetric waveform ion mobility spectrometry (FAIMS) device to image metabolites, lipids, and proteins in biological tissue samples. Optimized FAIMS parameters for specific molecular classes enabled semitargeted detection of multiply charged molecular species at enhanced signal-to-noise ratios (S/N), improved visualization of spatial distributions, and, most importantly, allowed detection of species which were unseen by ambient ionization MSI alone...
December 6, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27737898/diagnosis-of-endocrine-disease-how-reliable-are-free-thyroid-and-total-t3-hormone-assays
#15
REVIEW
Kerry J Welsh, Steven J Soldin
Hypothyroidism is a very common disorder worldwide, for which the usual treatment is monotherapy with levothyroxine (L-T4). However, a number of patients treated with L-T4 continue to report symptoms of hypothyroidism despite seemingly normal levels of thyroid-stimulating hormone (TSH), free-T3 (FT3) and free-T4 (FT4) measured by immunoassay. This review summarizes the limitations of the immunoassays commonly used to measure thyroid hormone levels and emphasizes the advantages of the role of liquid chromatography-tandem mass spectrometry (LC-MS/MS)...
December 2016: European Journal of Endocrinology
https://www.readbyqxmd.com/read/27736322/thyroglobulin-liquid-chromatography-tandem-mass-spectrometry-has-a-low-sensitivity-for-detecting-structural-disease-in-patients-with-anti-thyroglobulin-antibodies
#16
Umal Azmat, Kyle Porter, Leigha Senter, Matthew D Ringel, Fadi Nabhan
BACKGROUND: Thyroglobulin (Tg) measurement in patients with positive anti-thyroglobulin antibodies (anti-Tg Abs) is not reliable. Tg measurement using Liquid Chromatography Tandem Mass Spectrometry (LC/MS) may be useful in this setting Methods: This is a retrospective study with the objective to determine the accuracy of Tg-LC/MS in patients with thyroid cancer with anti-Tg Abs. We evaluated all patients with follicular cell-derived thyroid cancer (TC) who had thyroglobulin measured using LC/MS assay from 11/1/2013-11/7/2014...
October 13, 2016: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/27732086/a-nonradioactive-dehal-assay-for-testing-substrates-inhibitors-and-monitoring-endogenous-activity
#17
Kostja Renko, Carolin S Hoefig, Corinne Dupuy, Lisbeth Harder, Christian Schwiebert, Josef Köhrle, Lutz Schomburg
Iodotyrosine deiodinase (DEHAL1) is a crucial enzyme in iodine homeostasis. Unbound mono- and diiodotyrosines are indispensable byproducts of thyroid hormone biosynthesis. Their iodine needs to be recovered to avoid iodine deficiency, as observed in genetic defects in DEHAL1. Despite its importance, the enzyme is rarely studied. The deiodination process can be monitored by radioactive tracers or via techniques involving mass spectrometry. However, isotope-labeled molecules are expensive, not always commercially available, and their use is legally restricted, whereas mass spectrometry requires sophisticated, costly, and sensitive instrumentation...
December 2016: Endocrinology
https://www.readbyqxmd.com/read/27729057/takotsubo-like-syndrome-triggered-by-fludrocortisone-overdose-for-addison-s-disease-a-case-report
#18
Radu Campean, Matthias Hasun, Claudia Stöllberger, Johannes Bucher, Josef Finsterer, Christoph Schnack, Franz Weidinger
BACKGROUND: Reversible left ventricular dysfunction, also termed Takotsubo cardiomyopathy, is rarely reported in Addison's disease after initiation of hormone replacement therapy. The pathogenesis of this cardiomyopathy is unknown. CASE PRESENTATION: A 41-year-old white woman with a history of autoimmune Hashimoto thyroiditis diagnosed 3 years earlier and acute adrenal insufficiency diagnosed 3 weeks earlier presented with new onset of heart failure New York Heart Association class IV, which had started shortly after initiation of hormone replacement therapy with hydrocortisone 20 mg/day and fludrocortisone 0...
October 12, 2016: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/27676653/a-novel-role-for-flotillin-containing-lipid-rafts-in-negative-feedback-regulation-of-thyroid-specific-gene-expression-by-thyroglobulin
#19
Yuqian Luo, Takeshi Akama, Akiko Okayama, Aya Yoshihara, Mariko Sue, Kenzaburo Oda, Moyuru Hayashi, Yuko Ishido, Hisashi Hirano, Naoki Hiroi, Ryohei Katoh, Koichi Suzuki
BACKGROUND: Thyroglobulin (Tg) stored in thyroid follicles regulates follicular function in thyroid hormone (TH) synthesis by suppressing thyroid-specific gene expression in a concentration-dependent manner. Thus, Tg is an intrinsic negative-feedback regulator that can restrain the effect of thyroid stimulating hormone (TSH) in the follicle. However, the underlying mechanisms by which Tg exerts its prominent autoregulatory effect following recognition by thyrocytes remains unclear. METHODS: To identify potential proteins that recognize and interact with Tg, mass spectrometry (MS) was used to analyze immunoprecipitated Tg-bound proteins derived from Tg-treated rat thyroid FRTL-5 cells...
September 27, 2016: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/27659048/cardiolipins-are-biomarkers-of-mitochondria-rich-thyroid-oncocytic-tumors
#20
Jialing Zhang, Wendong Yu, Seung Ryu, John Lin, Gerardo Buentello, Robert Tibshirani, James Suliburk, Livia Schiavinato Eberlin
Oncocytic tumors are characterized by an excessive eosinophilic, granular cytoplasm due to aberrant accumulation of mitochondria. Mutations in mitochondrial DNA occurs in oncocytic thyroid tumors, but there is no information about their lipid composition which might reveal candidate theranostic molecules. Here we used desorption electrospray ionization mass spectrometry (DESI-MS) to image and chemically characterize the lipid composition of oncocytic thyroid tumors, as compared to non-oncocytic thyroid tumors and normal thyroid samples...
September 22, 2016: Cancer Research
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