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https://www.readbyqxmd.com/read/28229587/non-peptide-based-small-molecule-probe-for-fluorogenic-and-chromogenic-detection-of-chymotrypsin
#1
Lei Wu, Shu-Hou Yang, Hao Xiong, Jia-Qian Yang, Jun Guo, Wen-Chao Yang, Guang-Fu Yang
We report herein a non-peptide-based small molecule probe for fluorogenic and chromogenic detection of chymotrypsin, and the primary application. This probe was rationally designed by mimicking the peptide substrate and optimized by adjusting the recognization group. The refined probe 2 exhibits good specificity toward chymotrypsin, producing about 25-fold higher enhancement in both the fluorescence intensity and absorbance upon the catalysis by chymotrypsin. Compared with the most widely used peptide substrate (AMC-FPAA-Suc) of chymotrypsin, probe 2 shows about 5-fold higher binding affinity, and comparable catalytical efficiency against chymotrypsin...
February 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28223215/bufadienolides-from-kalanchoe-daigremontiana-as-thrombin-inhibitors-in-vitro-and-in-silico-study
#2
Joanna Kolodziejczyk-Czepas, Malgorzata Sieradzka, Barbara Moniuszko-Szajwaj, Łukasz Pecio, Michal B Ponczek, Pawel Nowak, Anna Stochmal
Thrombin is an active plasma coagulation factor II, critical for the formation of fibrin clot during blood coagulation. For that reason, this protein is also a crucial target for different anti-thrombotic therapies. The work is based on in vitro evaluation of the inhibitory effect of bufadienolide-rich fraction, isolated from roots of Kalanchoe daigremontiana (1-50μg/ml) on enzymatic properties of a serine proteinase - thrombin. The efficacy of the inhibition of amidolytic activity of thrombin (measured as a hydrolysis of the chromogenic substrate S-2238, Chromogenix) attained about 10 and 66%, respectively...
February 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28220555/population-pharmacokinetic-characterization-of-bay-81-8973-a-full-length-recombinant-factor-viii-lessons-learned-importance-of-including-samples-with-factor-viii-levels-below-the-quantitation-limit
#3
D Garmann, S McLeay, A Shah, P Vis, M Maas Enriquez, B A Ploeger
INTRODUCTION: The pharmacokinetics (PK), safety and efficacy of BAY 81-8973, a full-length, unmodified, recombinant human factor VIII (FVIII), were evaluated in the LEOPOLD trials. AIM: The aim of this study was to develop a population PK model based on pooled data from the LEOPOLD trials and to investigate the importance of including samples with FVIII levels below the limit of quantitation (BLQ) to estimate half-life. METHODS: The analysis included 1535 PK observations (measured by the chromogenic assay) from 183 male patients with haemophilia A aged 1-61 years from the 3 LEOPOLD trials...
February 20, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28217846/enhanced-peroxidase-like-performance-of-gold-nanoparticles-by-hot-electrons
#4
Xinghua Xia, Chen Wang, Yi Shi, Xing-Guo Nie, Yuan-Yuan Dan, Jian Li
Enzyme mimics have been widely used as alternatives to natural enzymes. However, the catalytic performances of enzyme mimics are often decreased due to different spatial structures or absence of functional groups compared to natural enzymes. Herein, we report a highly efficient enzyme-like catalytic performance of gold nanoparticles (AuNPs) by visible light stimulation. The enzyme-like reaction is evaluated by the catalytic reaction of AuNPs oxidizing a typical chromogenic substrate 3, 3', 5, 5'-tetramethylbenzydine (TMB) with hydrogen peroxide as an oxidant...
February 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28217472/yellow-pseudochromhidrosis-in-a-young-female
#5
Pragya A Nair, Rahul Krishna S Kota, Nishit K Surti, Nilofar G Diwan, Shailee S Gandhi
Chromhidrosis is a rare disorder in which there is pigmentation of sweat in a variety of colors. It can be classified into apocrine, pseudoeccrine, and true eccrine chromhidrosis. Pseudochromhidrosis is a condition in which the excreted sweat is colorless, but later acquires color due to contact with chromogenic chemicals. Systemic and topical antibiotics are the mainstay of treatment. Although it does not constitute a major health issue, it causes psychological stress and social embarrassment. A 20-year-old female presented to us with yellow-colored sweat and discoloration of clothes since 1 month...
January 2017: Indian Dermatology Online Journal
https://www.readbyqxmd.com/read/28208244/fluorescein-based-chromogenic-and-ratiometric-fluorescence-probe-for-highly-selective-detection-of-cysteine-and-its-application-in-bioimaging
#6
Zhen-Hai Fu, Xiao Han, Yongliang Shao, Jianguo Fang, Zhi-Hong Zhang, Ya-Wen Wang, Yu Peng
A dual mode fluorescent probe, which is based on an integration of fluorescein and coumarin fluorophores, was developed for the discrimination of Cys from Hcy and GSH. This probe (2) shows the advantage of quick reaction (5 min) with Cys, resulting in a strong fluorescence turn-on response when excited at 450 nm. Notably, it also demonstrates the ratiometric fluorescence property while excited by a shorter wavelength (332 nm). All of results suggest probe 2 has a high selectivity toward Cys even in the presence of other amino acids, cations and anions...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207887/platelet-monocyte-derived-and-tissue-factor-carrying-circulating-microparticles-are-related-to-acute-myocardial-infarction-severity
#7
Gemma Chiva-Blanch, Kristian Laake, Peder Myhre, Vibeke Bratseth, Harald Arnesen, Svein Solheim, Lina Badimon, Ingebjørg Seljeflot
OBJECTIVE: Circulating microparticles (cMPs) are phospholipid-rich vesicles released from cells when activated or injured, and contribute to the formation of intracoronary thrombi. Tissue factor (TF, CD142) is the main trigger of fibrin formation and TF-carrying cMPs are considered one of the most procoagulant cMPs. Similar types of atherosclerotic lesions may lead to different types of AMI, although the mechanisms behind are unresolved. Therefore, we aimed to investigate the phenotype of cMPs found in plasma of ACS patients and its relation to AMI severity and thrombotic burden...
2017: PloS One
https://www.readbyqxmd.com/read/28198071/measuring-fviii-activity-of-glycopegylated-recombinant-factor-viii-n8-gp-with-commercially-available-one-stage-clotting-and-chromogenic-assay-kits-a-two-centre-study
#8
A Hillarp, A Bowyer, M Ezban, P Persson, S Kitchen
INTRODUCTION: Factor VIII activity (FVIII:C) assays of samples containing glycoPEGylated recombinant FVIII such as turoctocog alfa pegol (N8-GP) can be associated with differences in FVIII recovery in vitro between various one-stage activated partial thromboplastin time (APTT)-based clotting assays and some chromogenic assays. Careful validation and qualification of specific assays and conditions is therefore necessary for the assessment of FVIII:C in samples containing modified FVIII molecules...
February 14, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28195091/coagulation-profile-during-induction-chemotherapy-in-childhood-acute-lymphoblastic-leukemia
#9
Shivali Sehgal, Sunita Sharma, Jagdish Chandra, Anita Nangia
CONTEXT: Thromboembolism in children with acute lymphoblastic leukemia (ALL) is most commonly reported after the initiation of antileukemic therapy, indicating a possible interaction of disease and therapy. AIMS: To study the effect of induction chemotherapy on coagulation parameters in pediatric ALL patients. SETTINGS AND DESIGN: Thirty-seven newly diagnosed patients of ALL up to 18 years of age were evaluated along with 30 age- and sex-matched controls...
January 2017: Indian Journal of Pathology & Microbiology
https://www.readbyqxmd.com/read/28191733/a-novel-dynamic-expression-of-vasa-in-male-germ-cells-during-spermatogenesis-in-the-chinese-soft-shell-turtle-pelidiscus-sinensis
#10
Wei Li, Piaoyi Zhang, Xuling Wu, Xinping Zhu, Hongyan Xu
vasa gene encodes a highly conserved DEAD-box RNA helicase, required for germ cell development across animal kingdom. Vasa mutations cause male infertility in mammals. It has been widely used as a biomarker for studying animal fertility or manipulating germ cells in organisms. However, in reptilians, the functions of vasa gene involved in germ cell differentiation are largely unclear; this hampers the development of biological techniques and the improvement of the productivity in these species. Here a vasa cDNA was isolated in Chinese soft-shell turtle and it predicts a protein of 691 amino acid residues, which is 72%, 69%, 58%, 59%, and 54-56% identical to its homolog from mouse, platypus, frog, chicken, and fish, respectively, and named as PsVasa...
February 13, 2017: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/28188752/comparison-of-five-ki67-antibodies-regarding-reproducibility-and-capacity-to-predict-prognosis-in-breast-cancer-does-the-antibody-matter
#11
Balázs Ács, Janina Kulka, K Attila Kovács, Ivett Teleki, Anna-Mária Tőkés, Ágnes Meczker, Balázs Győrffy, Lilla Madaras, Tibor Krenács, A Marcell Szász
Although several antibodies are available for immunohistochemical (IHC) detection of Ki-67, even the most commonly used MIB-1 has not been validated yet. Our aim was to compare 5 commercially available antibodies for detection of Ki-67 in terms of agreement and their ability in predicting prognosis of breast cancer. Tissue microarrays were constructed from 378 breast cancer patients' representative formalin-fixed paraffin-embedded tumor blocks. Five antibodies were used to detect Ki-67 expression: MIB-1-using chromogenic detection and immunofluorescent labeled (IF) MIB1-, SP-6, 30-9, poly and B56...
February 8, 2017: Human Pathology
https://www.readbyqxmd.com/read/28188529/dual-color-multiplex-analysis-of-protein-microarrays-for-precision-medicine
#12
Solomon Yeon, Florian Bell, Michael Shultz, Grace Lawrence, Michael Harpole, Virginia Espina
Generating molecular information in a clinically relevant time frame is the first hurdle to truly integrating precision medicine in health care. Reverse phase protein microarrays are being utilized in clinical trials for quantifying posttranslationally modified signal transduction proteins and cellular signaling pathways, allowing direct comparison of the activation state of proteins from multiple specimens, or individual patient specimens, within the same array. This technology provides diagnostic and therapeutic information critical to precision medicine...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28188221/successful-use-of-laboratory-monitoring-to-facilitate-an-invasive-procedure-for-a-patient-treated-with-dabigatran
#13
Mackenzie Byron, Sara Zochert, Thaddaus Hellwig, Marioara Gavozdea-Barna, Michael P Gulseth
PURPOSE: A case in which novel and traditional laboratory markers were successfully used to determine surgical intervention timing in an elderly patient receiving dabigatran for atrial fibrillation is reported. SUMMARY: An 86-year-old woman who was taking dabigatran for atrial fibrillation suffered a right femoral neck fracture requiring surgical intervention. Dabigatran was withheld once the patient was admitted to the hospital, and the pharmacy inpatient anticoagulation management team was consulted for guidance on determining appropriate scheduling of surgical intervention with regard to the time since her most recent dabigatran dose to minimize bleeding complications...
February 10, 2017: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/28186585/-analysis-of-phenotypes-and-genetic-mutations-in-two-pedigrees-affected-with-hereditary-protein-c-deficiency
#14
Lihong Yang, Yanhui Jin, Ting Yang, Xiaoli Chen, Liqing Zhu, Mingshan Wang
OBJECTIVE: To explore the pathogenesis of protein C deficiency in two pedigrees through mutation detection and model analysis. METHODS: Chromogenic substrate method and enzyme linked immunosorbent assay (ELISA) were used to determine the plasma protein C activity (PC: A) and protein C antigen (PC: Ag) in the two probands and their family members. All of the 9 exons and intron-exon boundaries of the PROC gene were amplified by PCR and analyzed with Sanger sequencing after purification...
February 10, 2017: Zhonghua Yi Xue Yi Chuan Xue za Zhi, Zhonghua Yixue Yichuanxue Zazhi, Chinese Journal of Medical Genetics
https://www.readbyqxmd.com/read/28185358/effects-of-arginine-and-leucine-substitutions-on-anti-endotoxic-activities-and-mechanisms-of-action-of-cationic-and-amphipathic-antimicrobial-octadecapeptide-from-rice-%C3%AE-amylase
#15
Masayuki Taniguchi, Akihito Ochiai, Ryu Toyoda, Teppei Sato, Eiichi Saitoh, Tetsuo Kato, Takaaki Tanaka
Previously, we showed that the antimicrobial cationic and amphipathic octadecapeptide AmyI-1-18 from rice α-amylase (AmyI-1) inhibited the endotoxic activity of lipopolysaccharide (LPS) from Escherichia coli. In addition, we demonstrated that several AmyI-1-18 analogs containing arginine or leucine substitutions, which were designed on the basis of the helical wheel projection of AmyI-1-18, exhibited higher antimicrobial activity against human pathogenic microorganisms than AmyI-1-18. In the present study, anti-inflammatory (anti-endotoxic) activities of five AmyI-1-18 analogs containing arginine or leucine substitutions were investigated...
February 10, 2017: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://www.readbyqxmd.com/read/28178368/application-of-capillary-electrophoresis-with-capacitively-coupled-contactless-conductivity-detection-ce-c-4-d-an-update
#16
REVIEW
Abdalla A Elbashir, Oliver J Schmitz, Hassan Y Aboul-Enein
Capacitively coupled contactless conductivity detection (C(4) D) has appeared as a powerful technique for the detection of compounds lacking chromogenic or fluorogenic group. Since our last review (Biomedical Chromatography 2014; 28:1502-1506) several new CE-C(4) D methods have been reported. This review provides an update of the most recent utilization of CE-C(4) D in the field of pharmaceutical, biomedical and food analysis covering the period from February 2014 to October 2016. The use of CE with C(4) D in pharmaceutical field are shown in many papers...
February 8, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28170419/determination-of-rivaroxaban-in-patient-s-plasma-samples-by-anti-xa-chromogenic-test-associated-to-high-performance-liquid-chromatography-tandem-mass-spectrometry-hplc-ms-ms
#17
Priscilla Bento Matos Derogis, Livia Rentas Sanches, Valdir Fernandes de Aranda, Marjorie Paris Colombini, Cristóvão Luis Pitangueira Mangueira, Marcelo Katz, Adriana Caschera Leme Faulhaber, Claudio Ernesto Albers Mendes, Carlos Eduardo Dos Santos Ferreira, Carolina Nunes França, João Carlos de Campos Guerra
Rivaroxaban is an oral direct factor Xa inhibitor, therapeutically indicated in the treatment of thromboembolic diseases. As other new oral anticoagulants, routine monitoring of rivaroxaban is not necessary, but important in some clinical circumstances. In our study a high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was validated to measure rivaroxaban plasmatic concentration. Our method used a simple sample preparation, protein precipitation, and a fast chromatographic run...
2017: PloS One
https://www.readbyqxmd.com/read/28163381/chemical-tools-for-detecting-fe-ions
#18
REVIEW
Tasuku Hirayama, Hideko Nagasawa
Owing to its distinctive electrochemical properties with interconvertible multiple oxidation states, iron plays a significant role in various physiologically important functions such as respiration, oxygen transport, energy production, and enzymatic reactions. This redox activity can also potentially produce cellular damage and death, and numerous diseases are related to iron overload resulting from the dysfunction of the iron regulatory system. In this case, "free iron" or "labile iron," which refers to iron ion weakly bound or not bound to proteins, causes aberrant production of reactive oxygen species...
January 2017: Journal of Clinical Biochemistry and Nutrition
https://www.readbyqxmd.com/read/28160367/cerebral-amyloidoma-is-characterized-by-b-cell-clonality-and-a-stable-clinical-course
#19
Katharina Heß, Jan Purrucker, Ute Hegenbart, Benjamin Brokinkel, Rouven Berndt, Kathy Keyvani, Camelia M Monoranu, Mario Löhr, Guido Reifenberger, Christopher Munoz-Bendix, Jörg Kalla, Justus Groß, Uta Schick, Jennifer Kollmer, Wolfram Klapper, Christoph Röcken, Martin Hasselblatt, Werner Paulus
Amyloidomas are rare amyloid-containing lesions, which may also occur in the central nervous system. Etiology, pathogenesis and clinical course are poorly understood. To gain more insight into the biology of cerebral amyloidoma, we aimed to characterize its histopathological, molecular and clinical features in a retrospective series of seven patients. FFPE tissue specimens were examined using immunohistochemistry, chromogenic in situ hybridization (CISH) for light chains kappa and lambda as well as an IgH gene clonality analysis...
February 4, 2017: Brain Pathology
https://www.readbyqxmd.com/read/28155145/histochemical-demonstration-of-tripeptidyl-aminopeptidase-i
#20
Mashenka B Dimitrova, Dimitrinka Y Atanasova, Nikolai E Lazarov
Enzyme histochemical methods are valuable for the studies on the enzyme involvement in different pathological processes. Here we describe two protocols for chromogenic and fluorogenic histochemical demonstration of tripeptidyl aminopeptidase I (TPPI), a protease that is crucial for neuronal functions. The procedures are based on newly synthesized substrates for TPPI-glycyl-L-prolyl-L-metionyl-5-chloro-1-anthraquinonylhydrazide (GPM-CAH) and glycyl-L-prolyl-L-metionyl-4-hydrazido-N-hexyl-1,8-naphthalimide (GPM-HHNI)...
2017: Methods in Molecular Biology
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