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https://www.readbyqxmd.com/read/28724261/development-of-a-sandwich-enzyme-linked-immunosorbent-assay-for-dtmp-gh-fusion-protein-by-rational-immunogen-selection
#1
Song Wang, Mingqiang Shen, Shilei Chen, Cheng Wang, Fang Chen, Mo Chen, Gaomei Zhao, Xinze Ran, Tianmin Cheng, Yongping Su, Yang Xu, Junping Wang
dTMP-GH is a chimeric protein containing a tandem dimer of thrombopoietin mimetic peptide (dTMP) fused to human growth hormone (hGH) prepared previously by our team. It shows significant bioactivity in promoting thrombocytopoiesis, but detection of intact dTMP-GH in plasma is still a challenge due to the presence of endogenous hGH. In this study, a rabbit polyclonal antibody with high affinity to dTMP was obtained with a BSA-conjugated immunogen composed of 20 amino acids sequence spanning two TMP and the linker...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28723961/dysfunctional-gpr40-ffar1-signaling-exacerbates-pain-behavior-in-mice
#2
Kazuo Nakamoto, Fuka Aizawa, Kei Miyagi, Takuya Yamashita, Mitsumasa Mankura, Yutaka Koyama, Fumiyo Kasuya, Akira Hirasawa, Takashi Kurihara, Atsuro Miyata, Shogo Tokuyama
We previously showed that activation of G protein-coupled receptor 40/free fatty acid receptor 1 (GPR40/FFAR1) signaling modulates descending inhibition of pain. In this study, we investigated the involvement of fatty acid-GPR40/FFAR1 signaling in the transition from acute to chronic pain. We used GPR40/FFAR1-knockout (GPR40KO) mice and wild-type (WT) mice. A plantar incision was performed, and mechanical allodynia and thermal hyperalgesia were evaluated with a von Frey filament test and plantar test, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28723644/fir-haplodeficiency-promotes-splicing-to-pyruvate-kinase-m2-in-mice-thymic-lymphoma-tissues-revealed-by-six-plex-tandem-mass-tag-quantitative-proteomic-analysis
#3
Asako Kimura, Kouichi Kitamura, Guzhanuer Ailiken, Mamoru Satoh, Toshinari Minamoto, Nobuko Tanaka, Fumio Nomura, Kazuyuki Matsushita
The switch of pyruvate kinase (PK) M1 to PKM2 is pivotal for glucose metabolism in cancers. The PKM1/M2 shift is controlled by the alternative splicing of two mutually exclusive exons in the PKM gene. PKM1 is expressed in differentiated tissues, whereas PKM2 is expressed in cancer tissues. This study revealed that the haplodeficiency of FUSE-binding protein (FBP)-interacting repressor (FIR), a transcriptional repressor of the c-myc gene, contributed to the splicing of PKM1 to PKM2 in mice thymic lymphoma and/or T-cell type acute lymphoblastic leukemia (T-ALL) using six-plex tandem mass tag (TMT) quantitative proteomic analysis...
July 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/28723299/support-for-disease-only-genotypes-and-excess-of-homozygosity-at-the-cyth4-primate-specific-gttt-repeat-in-schizophrenia
#4
Ehteram Khademi, Elham Alehabib, Ehsan Esmaili Shandiz, Azadeh Ahmadifard, Monavvar Andarva, Javad Jamshidi, Simin Rahimi-Aliabadi, Ramin Pouriran, Farhad Ramezani Nejad, Nader Mansoori, Neda Shahmohammadibeni, Shaghyegh Taghavi, Parasto Shokraeian, Haleh Akhavan-Niaki, Coro Paisán-Ruiz, Hossein Darvish, Mina Ohadi
OBJECTIVE: The role of short tandem repeats (STRs) in the control of gene expression among species is being increasingly understood following the identification of several instances in which certain STRs occur identically, or expand differentially, in primates versus nonprimates. These STRs may regulate genes that participate in characteristics that have diverged primates from other species (e.g., brain higher order functions). The CYTH4 gene contains the longest tetranucleotide STR in its core promoter, at 7-repeats, and links to the evolution of human and nonhuman primates...
July 19, 2017: Genetic Testing and Molecular Biomarkers
https://www.readbyqxmd.com/read/28723276/can-an-app-help-identify-psychomotor-function-impairments-during-drinking-occasions-in-the-real-world-a-mixed-method-pilot-study
#5
Brian Suffoletto, Akash Goyal, Juan Carlos Puyana, Tammy Chung
BACKGROUND: Being able to measure the acute effects of alcohol consumption on psychomotor functions in natural settings could be useful in injury prevention interventions. This study examined the feasibility and acceptability of collecting app-based measures of information processing, working memory and gait stability during times of typical alcohol consumption among young adults. METHODS: Ten young adults (aged 21-26) with hazardous drinking completed a baseline assessment and ecological momentary assessments (EMA) on 4 consecutive Fridays and Saturdays, every hour from 8pm to 12am...
July 19, 2017: Substance Abuse
https://www.readbyqxmd.com/read/28723091/protomer-specific-photochemistry-investigated-using-ion-mobility-mass-spectrometry
#6
James N Bull, Neville J A Coughlan, Evan John Bieske
The utility of tandem ion mobility mass spectrometry coupled with electronic spectroscopy to investigate protomer-specific photochemistry is demonstrated by measuring the photoisomerization response for protomers of protonated 4-dicyanomethylene-2-methyl-6-para-dimethylaminostyryl-4H-pyran (DCM) molecules. The target DCMH(+) species, has three protomers that are distinguished by their different collision cross-sections with He, N2, and CO2 buffer gases, trends in abundance with ion source conditions, and from their photoisomerization responses...
July 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28722648/perspectives-on-the-pure-tone-audiogram
#7
REVIEW
Frank E Musiek, Jennifer Shinn, Gail D Chermak, Doris-Eva Bamiou
BACKGROUND: The pure-tone audiogram, though fundamental to audiology, presents limitations, especially in the case of central auditory involvement. Advances in auditory neuroscience underscore the considerably larger role of the central auditory nervous system (CANS) in hearing and related disorders. Given the availability of behavioral audiological tests and electrophysiological procedures that can provide better insights as to the function of the various components of the auditory system, this perspective piece reviews the limitations of the pure-tone audiogram and notes some of the advantages of other tests and procedures used in tandem with the pure-tone threshold measurement...
July 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/28722356/hansen-solubility-parameters-for-assay-method-optimization-of-simvastatin-ramipril-atenolol-hydrochlorothiazide-and-aspirin-in-human-plasma-using-liquid-chromatography-with-tandem-mass-spectrometry
#8
Murali Mohan Reddy Devalapalli, Hanumanth Srikanth Cheruvu, Thejaswi Yertha, Vijaya Bhaskar Veeravalli, Sunitha Sampathi, Savithri Shivakumar
A simple, specific, sensitive validated method was developed using liquid chromatography with tandem mass spectrometry with electrospray ionization of human plasma for the simultaneous estimation of drugs (simvastatin, ramipril, atenolol, hydrochlorothiazide and aspirin) of Polycap(TM) capsule used in cardiovascular therapy. The interaction of these actives including internal standards between the stationary and mobile phase were investigated using Hansen solubility parameters. Chromatographic separation was performed on Phenomenex Synergi Polar-RP (30 × 2 mm, 4 μm) column with a gradient mobile phase composition of acetonitrile and 5 mM ammonium formate for positive mode and 0...
July 19, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28722197/simultaneous-determination-and-method-validation-of-difenoconazole-propiconazole-and-pyraclostrobin-in-pepper-and-soil-by-lc-ms-ms-in-field-trial-samples-from-three-provinces-china
#9
Kunming Zheng, Banghua Meng, Sizhuo Wu, Haizhen Zhang, Fei Wang, Ying Cui, Song Zeng, Kankan Zhang, Deyu Hu
A liquid chromatography-electrospray ionization tandem mass spectrometry method was developed for simple and accurate detection of the fungicides difenoconazole, propiconazole and pyraclostrobin in peppers and soil. Three fungicides residues were extracted from samples by acetonitrile, cleaned up by dispersive solid phase extraction before instrumental analysis. The accuracy and precision of the method were evaluated by conducting intra- and inter-day recovery experiment. The limits of quantification and detection of difenoconazole, propiconazole and pyraclostrobin in pepper and soil were 0...
July 19, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28722072/highly-efficient-cr2o7-2-removal-of-a-3d-metal-organic-framework-fabricated-by-tandem-single-crystal-to-single-crystal-transformations-from-a-1d-coordination-array
#10
Cheng-Peng Li, Hang Zhou, Si Wang, Jing Chen, Zhong-Liang Wang, Miao Du
The single-crystal to single-crystal (SC-SC) transformation from a 1D coordination chain to a 3D coordination network, which is triggered by both solvent and anion exchanges, has been revealed to suffer from a tandem mechanism as proved by isolation of the intermediate state. The resulting porous crystalline material shows a high efficiency for the capture of dichromates (207 mg g(-1)) via the SC-SC anion-exchange.
July 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28721851/development-and-evaluation-of-a-multiple-locus-variable-number-tandem-repeats-analysis-assay-for-subtyping-salmonella-typhi-strains-from-sub-saharan-africa
#11
Nomsa P Tau, Anthony M Smith, John R Wain, Andrew Tarupiwa, Kalpy J Coulibaly, Karen H Keddy, Germs-Sa
PURPOSE: Molecular epidemiological investigations of the highly clonal Salmonella enterica subspecies enterica serovar Typhi (S. Typhi) are important in outbreak detection and in tracking disease transmission. In this study, we developed and evaluated a multiple-locus variable-number tandem-repeats (VNTR) analysis (MLVA) assay for characterization of S. Typhi isolates from sub-Saharan Africa. METHODOLOGY: Twelve previously reported VNTR loci were evaluated and an MLVA assay consisting of five polymorphic loci was adopted...
July 18, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28721719/imprinted-nanovelcro-microchips-for-isolation-and-characterization-of-circulating-fetal-trophoblasts-toward-noninvasive-prenatal-diagnostics
#12
Shuang Hou, Jie-Fu Chen, Min Song, Yazhen Zhu, Yu Jen Jan, Szu Hao Chen, Tzu-Hua Weng, Dean-An Ling, Shang-Fu Chen, Tracy Ro, An-Jou Liang, Tom Lee, Helen Jin, Man Li, Lian Liu, Yu-Sheng Hsiao, Peilin Chen, Hsiao-Hua Yu, Ming-Song Tsai, Margareta D Pisarska, Angela Chen, Li-Ching Chen, Hsian-Rong Tseng
Circulating fetal nucleated cells (CFNCs) in maternal blood offer an ideal source of fetal genomic DNA for noninvasive prenatal diagnostics (NIPD). We developed a class of nanoVelcro microchips to effectively enrich a subcategory of CFNCs, i.e., circulating trophoblasts (cTBs) from maternal blood, which can then be isolated with single-cell resolution by a laser capture microdissection (LCM) technique for downstream genetic testing. We first established a nanoimprinting fabrication process to prepare the LCM-compatible nanoVelcro substrates...
July 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28721695/myopes-have-significantly-higher-serum-melatonin-concentrations-than-non-myopes
#13
Stephanie Kearney, Lisa O'Donoghue, Kirsty L Pourshahidi, Diego Cobice, Kathryn J Saunders
PURPOSE: Experimental animal models of myopia demonstrate that higher melatonin (Mel) and lower dopamine (DA) concentrations actively promote axial elongation. This study explored the association between myopia and serum concentrations of DA and Mel in humans. METHODS: Morning serum concentrations of DA and Mel were measured by solid phase extraction-liquid chromatography-tandem mass spectrometry from 54 participants (age 19.1 ± 0.81 years) in September/October 2014 (phase 1) and March/April 2016 (phase 2)...
July 18, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28721670/extending-a-tandem-mass-spectral-library-to-include-ms-2-spectra-of-fragment-ions-produced-in-source-and-ms-n-spectra
#14
Xiaoyu Yang, Pedatsur Neta, Stephen E Stein
Tandem mass spectral library searching is finding increased use as an effective means of determining chemical identity in mass spectrometry-based omics studies. We previously reported on constructing a tandem mass spectral library that includes spectra for multiple precursor ions for each analyte. Here we report our method for expanding this library to include MS(2) spectra of fragment ions generated during the ionization process (in-source fragment ions) as well as MS(3) and MS(4) spectra. These can assist the chemical identification process...
July 18, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28721332/to-stent-or-not-to-stent-a-tale-of-two-occlusions
#15
Ali S Haider, Lyndon K Lee, Tijani Osumah, Saira Alli, Umair Khan, Steven Vayalumkal, Aida Kafai Golahmadi, Richa Thakur, Phu Nguyen, Kennith F Layton
Stenting and balloon angioplasty, along with mechanical thrombectomy, have gained notability as adjunctive treatment options to intravenous tissue plasminogen activator (IV-tPA) for tandem internal carotid artery (ICA) and middle cerebral artery (MCA) occlusions (TIM occlusions). Acute ischemic strokes (AISs) secondary to TIM occlusions are associated with poor patient outcomes primarily due to low recanalization rates following intravenous thrombolysis, consequently prompting the need for more invasive recanalization efforts...
June 17, 2017: Curēus
https://www.readbyqxmd.com/read/28720959/fortification-of-the-whey-protein-isolate-antioxidant-and-antidiabetic-activity-with-fraction-rich-in-phenolic-compounds-obtained-from-stevia-rebaudiana-bert-bertoni-leaves
#16
Paula Gimenez Milani, Maysa Formigoni, Yago Carvalho Lima, Silvano Piovan, Giuliana Maria Ledesma Peixoto, Daiane Montoia Camparsi, Willian do Nascimento da Silva Rodrigues, Jordana Quaglia Pereira da Silva, Alexandre da Silva Avincola, Eduardo Jorge Pilau, Cecília Edna Mareze da Costa, Silvio Cláudio da Costa
A stevia fraction (ASF) free of steviol glycosides was extracted from Stevia rebaudiana leaves (Stevia UEM-13). ASF essentially constitutes phenolic compounds (52.42%), which were identified by liquid chromatography tandem mass spectrometry (LC-MS/MS) as caffeic acid, quercetin-3-o-glycoside, cyanidin-3-glucoside, kaempferol, quercetin, apigenin, rozmarinic acid, chlorogenic acid and dicaffeoylquinic acid. ASF was used as a multi-functional source of phenolic compounds to fortify the whey protein isolate (WPI) obtained by membrane separation...
June 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28720752/a-quasi-direct-lc-ms-ms-based-targeted-proteomics-approach-for-mirna-quantification-via-a-covalently-immobilized-dna-peptide-probe
#17
Liang Liu, Qingqing Xu, Shuai Hao, Yun Chen
MicroRNAs (miRNAs) play a vital role in regulating gene expression and are associated with a variety of cancers, including breast cancer. Their distorted and unique expression is a potential marker in clinical diagnoses and prognoses. Thus, accurate determination of miRNA expression levels is a prerequisite for their applications. However, the assays currently available for miRNA detection typically require pre-enrichment, amplification and labeling steps, and most of the assays are only semi-quantitative. Therefore, we developed a quasi-direct liquid chromatography-tandem mass spectrometry (LC-MS/MS)-based targeted proteomics approach to quantify target miRNA by innovatively converting the miRNA signal into the mass response of a reporter peptide via a covalently immobilized DNA-peptide probe...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720701/de-novo-peptide-sequencing-by-deep-learning
#18
Ngoc Hieu Tran, Xianglilan Zhang, Lei Xin, Baozhen Shan, Ming Li
De novo peptide sequencing from tandem MS data is the key technology in proteomics for the characterization of proteins, especially for new sequences, such as mAbs. In this study, we propose a deep neural network model, DeepNovo, for de novo peptide sequencing. DeepNovo architecture combines recent advances in convolutional neural networks and recurrent neural networks to learn features of tandem mass spectra, fragment ions, and sequence patterns of peptides. The networks are further integrated with local dynamic programming to solve the complex optimization task of de novo sequencing...
July 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28720218/pesticide-analysis-in-coffee-leaves-using-a-quick-easy-cheap-effective-rugged-and-safe-approach-and-liquid-chromatography-tandem-mass-spectrometry-optimization-of-the-clean-up-step
#19
Maria Teresa Salles Trevisan, Robert Wyn Owen, Pau Calatayud-Vernich, Andrea Breuer, Yolanda Picó
An analytical method using a quick, easy, cheap, effective, rugged and safe (QuEChERS) procedure for multi-residue determination of 52 pesticides in coffee leaf extractshas been developed and validated according to SANTE/11945/2015 guidelines. Different sorbent combinations for dispersive solid phase extraction (d-SPE) clean-up as well as dispersive liquid-liquid microextraction (DLLME) were tested. The relative standard deviations (RSDs) for the recovery of 87-94% of pesticides added to coffee leaf extracts,was ≤20% for samples spiked at concentrations up to 50ng*g(-1) depending on the clean-up procedures...
July 11, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28720177/validation-of-multiresidue-method-for-analysis-of-31-pesticides-in-rice-using-gas-chromatography-tandem-mass-spectrometry
#20
Rahul Mondal, Ramen Kumar Kole, Anjan Bhttacharyya
Five modified QuEChERS were tested for the multiresidue analysis of 31 pesticides in rice. Rice was spiked with mixture solution of pesticides at 10 ng/g. Method selection was based on the LODs (sensitivity) and recovery tests (accuracy) of the pesticides. Analysis was done in GC-tandem MS in multiple reaction monitoring mode with a total run time of approximately 37 min. The selected method was validated after spiking rice at 20 and 100 ng/g in rice. The performance characteristics of the method impacted for all selected pesticides were acceptable according to the guidelines for method validation (recovery of 70-120% with an RSD of <20% and r2 value of ≥0...
July 1, 2017: Journal of AOAC International
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