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https://www.readbyqxmd.com/read/28636139/review-of-hplc-and-lc-ms-ms-assays-for-the-determination-of-various-non-steroidal-anti-androgens-nsaa-used-in-the-treatment-of-prostate-cancer
#1
REVIEW
P S Suresh, Nuggehally R Srinivas, Ramesh Mullangi
Prostate cancer is the most common cancer and one of the leading causes for cancer deaths in men. One of the commonly used approaches to treat metastatic prostate cancer was via first generation non-steroidal anti-androgens (NSAA) namely flutamide, nilutamide, bicalutamide and topilutamide. Most of the prostate cancer patients who are initially responsive develop a most aggressive form of disease called castration-resistant prostate cancer (CRPC). Second generation NSAA receptor antagonists (enzalutamide, apalutamide and darolutamide) are emerging as additional new options to treat CRPC...
June 21, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28634757/a-uhplc-ms-ms-method-for-profiling-multifunctional-steroids-in-human-hair
#2
Zhen Dong, Caihong Wang, Jinlan Zhang, Zhe Wang
It is important to profile steroids in many physiological and pathological processes. Recently, hair has been used for the long-term measurement of endogenous steroid hormones. Analyzing hair has advantages of being noninvasive and time sequential compared with other bio-specimens. Liquid chromatography-mass spectrometry (LC-MS) techniques have been widely used over the past decades; however, it is challenging to profile estrogens in hair by LC-MS, and more comprehensive steroid profiling is required. In this paper, an ultra high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method was developed to simultaneously profile 28 multifunctional steroids, including corticosteroids (n = 6), estrogens (n = 13), androgens (n = 5) and progestogens (n = 4), in human scalp hair in a single run...
June 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28634575/association-between-plasmatic-ceramides-profile-and-ast-alt-ratio-c14-0-ceramide-as-predictor-of-hepatic-steatosis-in-adolescents-independently-of-obesity
#3
Jorge Maldonado-Hernández, Gabriela E Saldaña-Dávila, Mónica I Piña-Aguero, Benjamín A Núñez-García, Mardia G López-Alarcón
OBJECTIVE: To assess the association between plasma ceramides and hepatic steatosis (HS) in adolescents, independently of obesity. MATERIALS AND METHODS: Ninety-four adolescents from two previous studies conducted and published by our crew were included. Study subjects were stratified in three groups: normal weight (n = 18), obesity (n = 34), and obesity + HS (n = 42). The presence of HS was defined when ALT/AST ratio was <1. Ceramides subspecies (C14:0, C16:0, C18:0, C24:0, and C24:1) were determined by LC/MS...
2017: Canadian Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28634471/a-chitin-binding-protein-purified-from-moringa-oleifera-seeds-presents-anticandidal-activity-by-increasing-cell-membrane-permeability-and-reactive-oxygen-species-production
#4
João X S Neto, Mirella L Pereira, Jose T A Oliveira, Lady C B Rocha-Bezerra, Tiago D P Lopes, Helen P S Costa, Daniele O B Sousa, Bruno A M Rocha, Thalles B Grangeiro, José E C Freire, Ana Cristina O Monteiro-Moreira, Marina D P Lobo, Raimunda S N Brilhante, Ilka M Vasconcelos
Candida species are opportunistic pathogens that infect immunocompromised and/or immunosuppressed patients, particularly in hospital facilities, that besides representing a significant threat to health increase the risk of mortality. Apart from echinocandins and triazoles, which are well tolerated, most of the antifungal drugs used for candidiasis treatment can cause side effects and lead to the development of resistant strains. A promising alternative to the conventional treatments is the use of plant proteins...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28634336/lc-ms-ms-quantification-of-sulfotransferases-is-better-than-conventional-immunogenic-methods-in-determining-human-liver-sult-activities-implication-in-precision-medicine
#5
Cong Xie, Tong-Meng Yan, Jia-Mei Chen, Xiao-Yan Li, Juan Zou, Li-Jun Zhu, Lin-Lin Lu, Ying Wang, Fu-Yuan Zhou, Zhong-Qiu Liu, Ming Hu
This study aims to determine whether enzyme activities are correlated with protein amounts and mRNA expression levels of five major human sulfotransferase (SULT) enzymes in 10 matched pericarcinomatous and hepatocellular carcinoma liver samples. The MRM UHPLC-MS/MS method, Western blot and RT-PCR were used along with SULT activity measurement using probe substrates. The LC-MS/MS method was specific for all five tested SULTs, whereas Western blot was specific for only two isoforms. The activities of SULT1A1, SULT1B1, SULT1E1 and SULT2A1 in 9 of 10 samples showed a significant decrease in tumor tissues relative to matched pericarcinomatous tissues, whereas the activities of SULT1A3 in 7 of 10 samples increased...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634228/spatial-mapping-and-profiling-of-metabolite-distributions-during-germination
#6
Adam D Feenstra, Liza E Alexander, Zhihong Song, Andrew R Korte, Marna Yandeau-Nelson, Basil J Nikolau, Young-Jin Lee
Germination is a highly complex process by which seeds begin to develop and establish themselves as viable organisms. In this paper, we utilize a combination of GC-MS, LC-fluorescence, and mass spectrometry imaging (MSI) approaches to profile and visualize the metabolic distributions of germinating seeds from two different inbreds of maize seeds, B73 and Mo17. GC and LC analyses demonstrate that the two inbreds are highly differentiated in their metabolite profiles throughout the course of germination, especially with regard to amino acids, sugar alcohols, and small organic acids...
June 20, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28634120/highly-reproducible-improved-label-free-quantitative-analysis-of-cellular-phosphoproteome-by-optimization-of-lc-ms-ms-gradient-and-analytical-column-construction
#7
Nagib Ahsan, Judson Belmont, Zhuo Chen, James G Clifton, Arthur R Salomon
Expanding the sequencing depth of the peptides with a statistically significant quantitative change derived from a biological stimulation is critical. Here we demonstrate that optimization of LC gradient and analytical column construction can reveal over 30,000 unique peptides and 23,000 phosphopeptides at high confidence. The quantitative reproducibility of different analytical workflows was evaluated by comparing the phosphoproteome of CD3/4 stimulated and unstimulated T-cells as a model system. A fritless, 50cm-long column packed with 1...
June 17, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28634119/an-ultrasensitive-stain-for-negative-protein-detection-in-sds-page-via-4-5-dibromofluorescein
#8
Dongdong Yu, Yang Wang, Shaoqing Zhang, Zhiwei Chen, Mei Xue, Ying Wang, Weitao Cong, Litai Jin, Zhongxin Zhu
A highly sensitive method for brief and economical staining of proteins in 1-D and 2-D sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) by 4',5'-Dibromofluorescein (DBF) was developed in this study. Down to 0.025-0.05ng protein could be detected within 10min (only 2 steps) by DBF stain, which is approximately 10-fold more sensitive than those of Eosin Y (EY) and SYPRO Ruby stains, and 20-fold more sensitive than that of imidazole-zinc (IZ) negative stain. In addition, the LC-MS/MS results indicated that the newly developed staining method is compatible with the downstream protein identification...
June 17, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28634118/identification-of-chickpea-seed-proteins-resistant-to-simulated-in-vitro-human-digestion
#9
I C Ribeiro, C C Leclercq, N Simões, A Toureiro, I Duarte, J B Freire, M M Chaves, J Renaut, C Pinheiro
Proteins and peptides able to resist gastrointestinal digestion and reach the intestinal mucosa have the potential to influence human health. Chickpea (Cicer arietinum L.) seed proteins are able to resist cooking (86.9% total protein) and/or in vitro simulated human digestion (15.9% total protein resists soaking, cooking and digestion with pepsin and pancreatin). To identify and characterize proteins resisting digestion we made use of different MS methodologies. The efficiency of several proteases (trypsin, AspN, chymotrypsin and LysC) was tested, and two technologies were employed (MALDI-TOF-TOF and LC-nESI-MS/MS)...
June 17, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28634114/peanut-digestome-identification-of-digestion-resistant-ige-binding-peptides
#10
Luigia Di Stasio, Gianluca Picariello, Mariantonietta Mongiello, Rita Nocerino, Roberto Berni Canani, Simona Bavaro, Linda Monaci, Pasquale Ferranti, Gianfranco Mamone
Stability to proteolytic degradation in the digestive tract is considered a general feature shared by most food allergens. Current digestibility models exclusively utilize purified allergen proteins, neglecting the relevant effects of matrix that occur for foodstuff systems. In the present study, we investigated digestion stability of the major peanut allergens directly in the natural matrix using an in vitro static model that simulates the gastrointestinal digestion including the oral, gastric, duodenal and intestinal (brush border membrane enzymes) phases...
June 17, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28633832/effects-of-ultrasound-on-the-beef-structure-and-water-distribution-during-curing-through-protein-degradation-and-modification
#11
Da-Cheng Kang, Xue-Qin Gao, Qing-Feng Ge, Guang-Hong Zhou, Wan-Gang Zhang
The objective of this study was to explore the mechanisms of power ultrasound (PUS, 150 and 300W) and treatment time (30 and 120min) on the water-holding capacity (WHC) and tenderness of beef during curing. Beef muscle at 48h post mortem was subjected to PUS treatment at a frequency of 20kHz. Analysis of compression loss and shear force showed that PUS-assisted curing significantly increased the WHC and the tenderness of beef compared to static brining (p<0.05). According to the analysis of LF-NMR, PUS treatment could increase the P21 values which indicated an improvement in water-binding ability of beef muscle...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633597/effect-of-t-2-toxin-injected-shrimp-muscle-extracts-on-mouse-macrophage-cells-raw264-7
#12
Zhanrui Huang, Yaling Wang, Mei Qiu, Lijun Sun, Jianmeng Liao, Rundong Wang, Xiaodong Sun, Siyuan Bi, Ravi Gooneratne
Following intramuscular injections of 0.1 mL, 3 mg kg(-1 )BW(-1)(1/10 LD50) T-2 toxin (T-2), the tissue concentration of T-2 in shrimp was quantitatively detected using LC-MS/MS. The biological half-time (t1/2) of T-2 in blood was 40.47 ± 0.24 min. The highest number of intramuscular T-2 shrimp could tolerate when given at blood t1/2 intervals was 4. The shrimps which were injected 5 T-2 died. The T-2 toxin highest accumulation was 0.471 ± 0.012 ng g(-1 )BW(-1). The effect of toxic shrimp muscle subjected to different processing conditions (high pressure, trifluoroacetic acid, acid and alkali digestions, artificial digestive juice [to simulate exposure to gastric and intestinal juices]) on mouse macrophage cells (RAW267...
February 10, 2017: Drug and Chemical Toxicology
https://www.readbyqxmd.com/read/28633284/determination-of-some-%C3%AE-blockers-and-%C3%AE-2-agonists-in-plasma-and-urine-using-liquid-chromatography-tandem-mass-spectrometry-and-solid-phase-extraction
#13
Alaa A Salem, Ibrahim Wasfi, Salama S Al-Nassib, Mahmoud Allawy Mohsin, Nawal Al-Katheeri
A highly sensitive method for the determinations of acebutolol, clenbuterol, nadolol, oxprenolol, propranolol, terbutaline and timolol β-blockers and β2-agonists in plasma and urine was developed. The method was optimized using electrospray ionization liquid chromatography-tandem mass spectrometry (LC-ESI-MS-MS) and clean screen solid phase extraction cartridges. Matrix effect was reduced by removing co-extractives from the SPE cartridges using methanol prior to drugs' elution. Using blood and serum matrices for calibration and applying the internal standard method has also contributed to the reduction of matrix effect...
June 13, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28633108/bioactivity-and-quantitative-analysis-of-isohexenylnaphthazarins-in-root-periderm-of-two-echium-spp-e-%C3%A2-plantagineum-and-e-%C3%A2-gaditanum
#14
Alexandra G Durán, M Teresa Gutiérrez, Carlos Rial, Ascensión Torres, Rosa M Varela, Manuel M Valdivia, José M G Molinillo, Dominik Skoneczny, Leslie A Weston, Francisco A Macías
Isohexenylnaphthazarins are commonly found in the root periderm of several Boraginaceous plants and are known for their broad range of biological activities. The work described herein concerns the biological activity of compounds from the roots of Echium plantagineum L. and Echium gaditanum Boiss (Boraginaceae) collected from field sites in southern Spain and Australia. Bioactivity was assessed using etiolated wheat coleoptile bioassay and in vitro growth inhibitory activity in HeLa and IGROV-1 cells. The quantification of four isohexenylnaphthazarins (shikonin/alkannin, deoxyshikonin/deoxyalkannin, acetylshikonin/acetylalkannin and dimethylacrylshikonin/dimethylacrylalkannin) was performed by LC-MS/MS using juglone as internal standard...
June 17, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28633005/autophagy-impairment-mediated-by-s-nitrosation-of-atg4b-leads-to-neurotoxicity-in-response-to-hyperglycemia
#15
Yazi Li, Yuying Zhang, Lei Wang, Ping Wang, Yanhong Xue, Xiaopeng Li, Xinhua Qiao, Xu Zhang, Tao Xu, Guanghui Liu, Peng Li, Chang Chen
The majority of diabetic patients develop neuropathy and there is an increasing prevalence of neurodegeneration in the central nervous system (CNS). However, the mechanism behind is poorly understood. Here we first observed that macroautophagy/autophagy was suppressed in the hippocampus of diabetic GK rats with hyperglycemia, whereas it was unchanged in ob/ob mice without hyperglycemia. Autophagy could be directly inhibited by high glucose in mouse primary hippocampal neurons. Moreover, autophagy was protective in high-glucose-induced neurotoxicity...
June 20, 2017: Autophagy
https://www.readbyqxmd.com/read/28632510/itraq-based-quantitative-proteomic-analysis-of-lungs-in-murine-polymicrobial-sepsis-with-hydrogen-gas-treatment
#16
Yingxue Bian, Chao Qin, Yuchang Xin, Yang Yu, Hongguang Chen, Guolin Wang, Keliang Xie, Yonghao Yu
Sepsis-associated acute lung injury (ALI), which carries a high morbidity and mortality in patients, has no effective therapeutic strategies to date. Our group have already reported that hydrogen gas (H2) exerts a protective effect against sepsis in mice. However, the molecular mechanisms underlying H2 treatment are not fully understood. This study investigated the effects of H2 on lung injuries in septic mice through the iTRAQ-based quantitative proteomic analysis. Male ICR mice used in this study were subjected to cecal ligation and puncture (CLP) or sham operation...
June 19, 2017: Shock
https://www.readbyqxmd.com/read/28631318/bupropion-overdose-resulted-in-a-pharmacobezoar-in-a-fatal-bupropion-wellbutrin-%C3%A2-sustained-release-overdose-postmortem-distribution-of-bupropion-and-its-major-metabolites
#17
Gregory Schmit, Evy De Boosere, Jessica Vanhaebost, Arnaud Capron
Bupropion (BUP) overdose commonly causes generalized seizures and central nervous system depression. The case of a 28-year-old woman who died from a massive lethal overdose with sustained-release bupropion (Wellbutrin(®) 300 mg) is herein presented. The autopsy revealed the presence of a pharmacobezoar consisting of at least 40 tablets in the stomach. Determination of bupropion and its active metabolites (hydroxybupropion, threobupropion, erythrobupropion) was achieved by a liquid chromatographic mass spectrometry (LC-MS/MS) method...
June 20, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28631214/identification-of-bufadienolides-from-the-boreal-toad-anaxyrus-boreas-active-against-a-fungal-pathogen
#18
Kelly Barnhart, Megan E Forman, Thomas P Umile, Jordan Kueneman, Valerie McKenzie, Irene Salinas, Kevin P C Minbiole, Douglas C Woodhams
Amphibian granular glands provide a wide range of compounds on the skin that defend against pathogens and predators. We identified three bufadienolides-the steroid-like compounds arenobufagin, gamabufotalin, and telocinobufagin-from the boreal toad, Anaxyrus boreas, through liquid chromatography mass spectrometry (LC/MS). Compounds were detected both after inducing skin gland secretions and in constitutive mucosal rinses from toads. We described the antimicrobial properties of each bufadienolide against Batrachochytrium dendrobatidis (Bd), an amphibian fungal pathogen linked with boreal toad population declines...
June 19, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28631158/rapid-and-reliable-steroid-hormone-profiling-in-tursiops-truncatus-blubber-using-liquid-chromatography-tandem-mass-spectrometry-lc-ms-ms
#19
Ashley S P Boggs, Tracey B Schock, Lori H Schwacke, Thomas M Galligan, Jeanine S Morey, Wayne E McFee, John R Kucklick
Monitoring of marine mammal steroid hormone status using matrices alternative to blood is desirable due to the ability to remotely collect samples, which minimizes stress to the animal. However, measurement techniques in alternative matrices such as blubber described to date are limited in the number and types of hormones measured. Therefore, a new method using bead homogenization to QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) extraction, C18 post extraction cleanup and analysis by liquid chromatography tandem mass spectrometry (LC-MS/MS) was developed and applied to the measurement of hormone suites in bottlenose dolphin blubber...
June 19, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28631076/effects-of-glycyrrhizic-acid-on-the-pharmacokinetics-of-pristimerin-in-rats-and-its-potential-mechanism
#20
Xiufen Zhao, Yan Wu, Dongmei Wang
BACKGROUND AND OBJECTIVES: Pristimerin has been reported to possess a wide range of pharmacological activities. This study investigates the effects of glycyrrhizic acid on the pharmacokinetics of pristimerin in rats. METHODS: The pharmacokinetics of orally administered pristimerin (2 mg/kg) with or without glycyrrhizic acid pretreatment (at a dose of 100 mg/kg/day for 7 days) were investigated. The plasma concentration of pristimerin was determined using a sensitive and reliable LC-MS/MS method, and the pharmacokinetics profiles were calculated and compared...
June 19, 2017: European Journal of Drug Metabolism and Pharmacokinetics
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