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https://www.readbyqxmd.com/read/29133077/-chronic-kidney-failure-and-biotin-a-combination-inducing-unusual-results-in-thyroid-and-parathyroid-investigations-report-of-2-cases
#1
Miora Koloina Ranaivosoa, Sébastien Ganel, Arnaud Agin, Sarah Romain, Xavier Parent, Nathalie Reix
In clinical chemistry, many immunoassays apply biotin and streptavidin in the assay principle. Presence of high levels of biotin in patient samples can produce negative or positive interference depending on the assay format. In this study, we describe 2 clinical cases with chronic kidney failure and with unusual thyroid and parathyroid function test results due to biotin interference. We studied the impact of biotin levels on thyroid stimulating hormone (TSH), free thyroxine (T4L) and parathormone (PTH) results with a pool of sera loaded with several concentrations of biotin...
November 10, 2017: Néphrologie & Thérapeutique
https://www.readbyqxmd.com/read/29108484/the-validation-of-quantitative-mass-spectrometry-assays-for-clinical-chemistry-assessments-in-animal-models
#2
Jennifer L Colangelo
Mass spectrometry (MS) has become a key platform in the clinical pathology laboratory and is being used more frequently for clinical pathology assessments in preclinical species for drug development studies. MS assays are being utilized for some traditional clinical pathology end points as well as novel biomarker analyses. For effective deployment in drug development toxicology studies, assays must be validated for use, and these validations are not very different from other bioanalytical platforms commonly found in the clinical pathology laboratory...
January 1, 2017: Toxicologic Pathology
https://www.readbyqxmd.com/read/29090536/-consideration-about-chemistry-manufacture-and-control-cmc-key-problems-in-simplified-registration-of-classical-traditional-chinese-medicine-excellent-prescriptions
#3
Zhi-Min Wang, Ju-Yan Liu, Xiao-Qian Liu, De-Qin Wang, Li-Hua Yan, Jin-Jin Zhu, Hui-Min Gao, Chun Li, Jin-Yu Wang, Chu-Yuan Li, Qing-Chun Ni, Ji-Sheng Huang, Juan Lin
As an outstanding representative of traditional Chinese medicine(TCM) prescriptions accumulated from famous TCM doctors' clinical experiences in past dynasties, classical TCM excellent prescriptions (cTCMeP) are the most valuable part of TCM system. To support the research and development of cTCMeP, a series of regulations and measures were issued to encourage its simplified registration. There is still a long-way to go because many key problems and puzzles about technology, registration and administration in cTCMeP R&D process are not resolved...
May 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29064366/spot-protein-creatinine-ratio-and-spot-albumin-creatinine-ratio-in-the-assessment-of-pre-eclampsia-a-diagnostic-accuracy-study-with-decision-analytic-model-based-economic-evaluation-and-acceptability-analysis
#4
Jason Waugh, Richard Hooper, Edmund Lamb, Stephen Robson, Andrew Shennan, Fiona Milne, Christopher Price, Shakila Thangaratinam, Vladislav Berdunov, Jenn Bingham
BACKGROUND: The National Institute for Health and Care Excellence (NICE) guidelines highlighted the need for 'large, high-quality prospective studies comparing the various methods of measuring proteinuria in women with new-onset hypertensive disorders during pregnancy'. OBJECTIVES: The primary objective was to evaluate quantitative assessments of spot protein-creatinine ratio (SPCR) and spot albumin-creatinine ratio (SACR) in predicting severe pre-eclampsia (PE) compared with 24-hour urine protein measurement...
October 2017: Health Technology Assessment: HTA
https://www.readbyqxmd.com/read/29062027/harnessing-a-catalytic-lysine-residue-for-the-one-step-preparation-of-homogeneous-antibody-drug-conjugates
#5
Alex R Nanna, Xiuling Li, Even Walseng, Lee Pedzisa, Rebecca S Goydel, David Hymel, Terrence R Burke, William R Roush, Christoph Rader
Current strategies to produce homogeneous antibody-drug conjugates (ADCs) rely on mutations or inefficient conjugation chemistries. Here we present a strategy to produce site-specific ADCs using a highly reactive natural buried lysine embedded in a dual variable domain (DVD) format. This approach is mutation free and drug conjugation proceeds rapidly at neutral pH in a single step without removing any charges. The conjugation chemistry is highly robust, enabling the use of crude DVD for ADC preparation. In addition, this strategy affords the ability to precisely monitor the efficiency of drug conjugation with a catalytic assay...
October 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/29038839/hepatotoxic-combination-effects-of-three-azole-fungicides-in-a-broad-dose-range
#6
T Heise, F Schmidt, C Knebel, S Rieke, W Haider, I Geburek, L Niemann, P Marx-Stoelting
Single active substances of pesticides are thoroughly examined for their toxicity before approval. In this context, the liver is frequently found to be the main target organ. Since consumers are generally exposed to multiple residues of different active substances via the diet, it is important to analyse combinations of active substances for potential mixture effects. For the (tri-)azoles, a group of agricultural fungicides and antifungal drugs, combination effects on the liver are likely because of a similar mode of action...
October 16, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/29034303/validation-of-capillary-blood-analysis-and-capillary-testing-mode-on-the-epoc-point-of-care-system
#7
Jing Cao, Rachel Edwards, Janette Chairez, Sridevi Devaraj
BACKGROUND: Laboratory test in transport is a critical component of patient care, and capillary blood is a preferred sample type particularly in children. This study evaluated the performance of capillary blood testing on the epoc Point of Care Blood Analysis System (Alere Inc). METHODS: Ten fresh venous blood samples was tested on the epoc system under the capillary mode. Correlation with GEM 4000 (Instrumentation Laboratory) was examined for Na+, K+, Cl-, Ca2+, glucose, lactate, hematocrit, hemoglobin, pO2, pCO2, and pH, and correlation with serum tested on Vitros 5600 (Ortho Clinical Diagnostics) was examined for creatinine...
December 2017: Pract Lab Med
https://www.readbyqxmd.com/read/29029351/development-and-application-of-a-dual-rat-and-human-ahr-activation-assay
#8
Martin R Brown, Helen Garside, Emma Thompson, Saseela Atwal, Chloe Bean, Tony Goodall, Michael Sullivan, Mark J Graham
Significant prolonged AHR activation, classically exhibited following exposure to TCDD (dioxin), can cause a variety of undesirable toxicological effects. Novel pharmaceutical chemistries also have the potential to cause activation of AHR and consequent toxicities in pre-clinical species and man. Previous methods either employed relatively expensive and low throughput primary hepatocyte dosing with PCR endpoint, or low resolution overexpressing reporter gene assays. We have developed, validated and applied an in vitro microtitre plate imaging-based medium throughput screening assay for the assessment of endogenous species-specific AHR activation potential via detection of induction of the surrogate transcriptional target Cytochrome P450 CYP1A1...
September 18, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28986333/protective-effect-of-danhong-injection-combined-with-naoxintong-capsule-on-cerebral-ischemia-reperfusion-injury-in-rats
#9
Jiayang Wan, Haofang Wan, Rongbin Yang, Haitong Wan, Jiehong Yang, Yu He, Huifen Zhou
ETHNOPHARMACOLOGICAL RELEVANCE: Danhong Injection (DHI) and Naoxintong Capsule (NXT) are renowned traditional Chinese medicine in China. The drug combination of DHI and NXT is frequently applied for the treatment of cardiovascular and cerebrovascular diseases in clinic. However, there had been no pharmacological experiment studies of interaction between DHI and NXT. Due to the drug interactions, exploring their interaction profile is of great importance. MATERIAL AND METHODS: In this study, focal cerebral I/R injury in adult male Sprague-Dawley rats were induced by transient middle cerebral artery occlusion (tMCAO) for 1h followed by reperfusion...
October 3, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28971363/recommendations-for-selection-and-characterization-of-protein-biomarker-assay-calibrator-material
#10
Kyra J Cowan, Lakshmi Amaravadi, Mark J Cameron, Damien Fink, Darshana Jani, Medha Kamat, Lindsay King, Robert J Neely, Yan Ni, Paul Rhyne, Renee Riffon, Yuda Zhu
As biomarkers continue to become an integral part of drug development and decision-making, there are increased expectations for reliable and quantitative assays. Protein biomarker assay results are directly influenced by the calibrator material. The selection of calibrator material presents many challenges that impact the relative accuracy and performance of the assay. There is an industry-wide challenge finding reliable and well-characterized calibrator material with good documentation. Several case studies are presented that demonstrate some of the challenges involved in selecting appropriate calibrators along with the resolutions that were ultimately applied...
November 2017: AAPS Journal
https://www.readbyqxmd.com/read/28966104/citrus-aurantium-bitter-orange-extract-safety-assessment-by-acute-and-14-day-oral-toxicity-studies-in-rats-and-the-ames-test-for-mutagenicity
#11
N S Deshmukh, S J Stohs, C C Magar, S B Kadam
The primary active constituent in bitter orange extract (BOE) is p-synephrine. This study assessed the safety of a BOE standardized to 50% p-synephrine following short-term exposure to rats and by the Ames Test. Following 5000 mg/kg of the extract orally to female rats all animals survived. Administration at 2000 mg/kg to female rats for four days yielded no signs of toxicity. Five male and five female rats were administered the BOE at 0, 250, 500, 1000 and 2000 mg/kg/day for 14 days. No significant effects were observed at any dose with respect to body weights, food intake, absolute and relative organ weights, hematology, clinical chemistry, and pathology...
September 28, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28961947/ebola-virus-inactivation-by-detergents-is-annulled-in-serum
#12
Jeroen J A van Kampen, Andrei Tintu, Henk Russcher, Pieter L A Fraaij, Chantal B E M Reusken, Mikel Rijken, Jaap J van Hellemond, Perry J J van Genderen, Rob Koelewijn, Menno D de Jong, Elaine Haddock, Robert J Fischer, Vincent J Munster, Marion P G Koopmans
Background: Treatment of blood samples from hemorrhagic fever virus (HFV)-infected patients with 0.1% detergents has been recommended for virus inactivation and subsequent safe laboratory testing. However, data on virus inactivation by this procedure are lacking. Here we show the effect of this procedure on diagnostic test results and infectious Ebola virus (EBOV) titers. Methods: Serum and whole-blood samples were treated with 0.1% or 1% sodium dodecyl sulfate (SDS) or 0...
October 17, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28950760/xpert-flu-as-a-rapid-diagnostic-test-for-respiratory-tract-viral-infection-evaluation-and-implementation-as-a-24-7-service
#13
Sofie Haglund, Maysae Quttineh, Annette Nilsson Bowers, Andreas Matussek, Anna J Henningsson
A rapid and reliable influenza method is important to meet diagnostic needs. Here, the performance of the cartridge-based Xpert Flu assay was evaluated in comparison with an in-house real-time PCR method. Analysis was then decentralized from the clinical microbiology laboratory located at County Hospital Ryhov, Jönköping, Sweden, to the clinical chemistry laboratories present at the three hospitals in Region Jönköping County, allowing a 24/7 service. In total, 189 clinical samples were included in 2014-2015...
September 26, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28941021/immobilization-of-vitronectin-binding-heparan-sulfates-onto-surfaces-to-support-human-pluripotent-stem-cells
#14
Lynn Yap, Sadasivam Murali, Gajadhar Bhakta, Drew M Titmarsh, Allen Kuan-Liang Chen, Lyn Chiin Sim, Muriel Bardor, Yu Ming Lim, James C H Goh, Steve K W Oh, Andre B H Choo, Andre J van Wijnen, David E Robinson, Jason D Whittle, William R Birch, Robert D Short, Victor Nurcombe, Simon M Cool
Functionalizing medical devices with polypeptides to enhance their performance has become important for improved clinical success. The extracellular matrix (ECM) adhesion protein vitronectin (VN) is an effective coating, although the chemistry used to attach VN often reduces its bioactivity. In vivo, VN binds the ECM in a sequence-dependent manner with heparan sulfate (HS) glycosaminoglycans. We reasoned therefore that sequence-based affinity chromatography could be used to isolate a VN-binding HS fraction (HS9) for use as a coating material to capture VN onto implant surfaces...
September 20, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28934305/the-prognostic-value-of-interleukin-17-in-lung-cancer-a-systematic-review-with-meta-analysis-based-on-chinese-patients
#15
REVIEW
Xiao-Fei Wang, Yi-Tong Zhu, Jia-Jia Wang, Da-Xiong Zeng, Chuan-Yong Mu, Yan-Bin Chen, Wei Lei, Ye-Han Zhu, Jian-An Huang
BACKGROUND: Interleukin-17 (IL-17) plays an important role in cancer progression. Previous studies remained controversial regarding the correlation between IL-17 expression and lung cancer (LC) prognosis. To comprehensively and quantitatively summarize the prognostic value of IL-17 expression in LC patients, a systematic review and meta-analysis were performed. METHODS: We identified the relevant literatures by searching the PubMed, EMBASE, Cochrane Library, SinoMed, China National Knowledge Infrastructure (CNKI) and Wanfang Data databases, up until April 1, 2017...
2017: PloS One
https://www.readbyqxmd.com/read/28918145/short-communication-relationship-between-methods-for-measurement-of-serum-electrolytes-and-the-relationship-between-ionized-and-total-calcium-and-neutrophil-oxidative-burst-activity-in-early-postpartum-dairy-cows
#16
B M Leno, E M Martens, M J B Felippe, K P Zanzalari, J C Lawrence, T R Overton
The objectives of this study were to (1) compare a test for serum measurement of total Ca (tCa), Mg, and P (VetTest Chemistry Analyzer, IDEXX Laboratories Inc., Westbrook, ME) to reference methods (spectrophotometric assays on a Beckman Coulter 640e automated clinical chemistry analyzer; Beckman Coulter, Brea, CA), (2) determine the relationship between ionized Ca (iCa) and reference method tCa in the immediate postpartum period, and (3) assess the relative value of these blood Ca indices as predictors of neutrophil oxidative burst activity...
November 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28918132/assessing-precision-bias-and-sigma-metrics-of-53-measurands-of-the-alinity-ci-system
#17
Sten Westgard, Victoria Petrides, Sharon Schneider, Marvin Berman, Jörg Herzogenrath, Anthony Orzechowski
Assay performance is dependent on the accuracy and precision of a given method. These attributes can be combined into an analytical Sigma-metric, providing a simple value for laboratorians to use in evaluating a test method's capability to meet its analytical quality requirements. Sigma-metrics were determined for 37 clinical chemistry assays, 13 immunoassays, and 3 ICT methods on the Alinity ci system. METHODS: Analytical Performance Specifications were defined for the assays, following a rationale of using CLIA goals first, then Ricos Desirable goals when CLIA did not regular the method, and then other sources if the Ricos Desirable goal was unrealistic...
September 13, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28912146/cerenkov-activated-sticky-tag-for-in-vivo-fluorescence-imaging
#18
Sudeep Das, Katja Haedicke, Jan Grimm
A big challenge for the clinical utilization of Cerenkov luminescence (CL) imaging is its low signal intensity, which is several orders of magnitude below ambient light. Consequently, highly sensitive cameras, sufficient shielding from background light and long acquisition times are required. To alleviate this problem, we hypothesize a strategy to convert the weak CL signal into a stronger fluorescence signal by using CL-activated formation of nitrenes from azides to locally fix a fluorescent probe in tissue by the formation of a covalent bond...
September 14, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28902615/irregular-analytical-errors-in-diagnostic-testing-a-novel-concept
#19
Michael Vogeser, Christoph Seger
BACKGROUND: In laboratory medicine, routine periodic analyses for internal and external quality control measurements interpreted by statistical methods are mandatory for batch clearance. Data analysis of these process-oriented measurements allows for insight into random analytical variation and systematic calibration bias over time. However, in such a setting, any individual sample is not under individual quality control. The quality control measurements act only at the batch level. Quantitative or qualitative data derived for many effects and interferences associated with an individual diagnostic sample can compromise any analyte...
September 13, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28898054/synthesis-radiolabeling-and-characterization-of-plasma-protein-binding-ligands-potential-tools-for-modulation-of-the-pharmacokinetic-properties-of-radio-pharmaceuticals
#20
Cristina Müller, Renáta Farkas, Francesca Borgna, Raffaella M Schmid, Martina Benešová, Roger Schibli
The development of (radio)pharmaceuticals with favorable pharmacokinetic profiles is crucial for allowing the optimization of the imaging or therapeutic potential and the minimization of undesired side effects. The aim of this study was, therefore, to evaluate and compare three different plasma protein binders (PPB-01, PPB-02, and PPB-03) that are potentially useful in combination with (radio)pharmaceuticals to enhance their half-life in the blood. The entities were functionalized with a 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) chelator via a l-lysine and β-alanine linker moiety using solid-phase peptide chemistry and labeled with (177)Lu (T1/2 = 6...
September 20, 2017: Bioconjugate Chemistry
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