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Asparaginase

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https://www.readbyqxmd.com/read/28921081/site-saturation-mutagenesis-of-mutant-l-asparaginase-ii-signal-peptide-hydrophobic-region-for-improved-excretion-of-cyclodextrin-glucanotransferase
#1
Abbas Ismail, Rosli Md Illias
The excretion of cyclodextrin glucanotransferase (CGTase) into the culture medium offers significant advantages over cytoplasmic expression. However, the limitation of Escherichia coli is its inability to excrete high amount of CGTase outside the cells. In this study, modification of the hydrophobic region of the N1R3 signal peptide using site-saturation mutagenesis improved the excretion of CGTase. Signal peptide mutants designated M9F, V10L and A15Y enhanced the excretion of CGTase three-fold and demonstrated two-fold higher secretion rate than the wild type...
September 18, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28916825/de-novo-transcriptome-of-the-cosmopolitan-dinoflagellate-amphidinium-carterae-to-identify-enzymes-with-biotechnological-potential
#2
Chiara Lauritano, Daniele De Luca, Alberto Ferrarini, Carla Avanzato, Andrea Minio, Francesco Esposito, Adrianna Ianora
Dinoflagellates are phytoplanktonic organisms found in both freshwater and marine habitats. They are often studied because related to harmful algal blooms but they are also known to produce bioactive compounds for the treatment of human pathologies. The aim of this study was to sequence the full transcriptome of the dinoflagellate Amphidinium carterae in both nitrogen-starved and -replete culturing conditions (1) to evaluate the response to nitrogen starvation at the transcriptional level, (2) to look for possible polyketide synthases (PKSs) in the studied clone (genes that may be involved in the synthesis of bioactive compounds), (3) if present, to evaluate if nutrient starvation can influence PKS expression, (4) to look for other possible enzymes of biotechnological interest and (5) to test strain cytotoxicity on human cell lines...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28911074/beyond-first-line-non-anthracycline-based-chemotherapy-for-extranodal-nk-t-cell-lymphoma-clinical-outcome-and-current-perspectives-on-salvage-therapy-for-patients-after-first-relapse-and-progression-of-disease
#3
S H Lim, J Y Hong, S T Lim, H Hong, J Arnoud, W Zhao, D H Yoon, T Tang, J Cho, S Park, Y H Ko, S J Kim, C Suh, T Lin, W S Kim
Background: Current standard treatment, including non-anthracycline-based chemotherapy and optimal combining of radiotherapy, has dramatically improved outcomes of patients with extranodal natural killer/T-cell lymphoma (ENKTL) during the last decade. This study was conducted to investigate the clinical outcome of ENKTL patients with relapsed or progressive disease after initial current standard therapy. Patients and methods: We retrospectively reviewed patients diagnosed with ENKTL at six centers in four countries (China, France, Singapore, and South Korea) from 1997 to 2015 and analyzed 179 patients who had relapsed or progressed after initial current standard therapy...
September 1, 2017: Annals of Oncology: Official Journal of the European Society for Medical Oncology
https://www.readbyqxmd.com/read/28899490/a-new-ph-indicator-dye-based-method-for-rapid-and-efficient-screening-of-l-asparaginase-producing-microorganisms
#4
Kanti N Mihooliya, Jitender Nandal, Laxmi Swami, Himanshu Verma, Lipsy Chopra, Debendra K Sahoo
l-asparaginase is a pharmaceutically and industrially important enzyme as it has potential to treat different cancers and inhibit acrylamide formation in fried and baked food products. In the present study, an attempt was made to screen for new and novel l-asparaginase producers using a widely applied phenol red and bromothymol blue (BTB)(1) dye-based plate assay. Screening of four different soil samples for l-asparaginase producers resulted in the isolation of three new potential l-asparaginase producing bacteria...
December 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28884687/questions-on-asparaginase-associated-pancreatitis
#5
Naveen Pemmaraju, Michael E Rytting
No abstract text is available yet for this article.
September 2017: Lancet Oncology
https://www.readbyqxmd.com/read/28884068/different-methodologies-for-sustainability-of-optimization-techniques-used-in-submerged-and-solid-state-fermentation
#6
REVIEW
Anup Ashok, Devarai Santhosh Kumar
Optimization techniques are considered as a part of nature's way of adjusting to the changes happening around it. There are different factors that establish the optimum working condition or the production of any value-added product. A model is accepted for a particular process after its sustainability has been verified on a statistical and analytical level. Optimization techniques can be divided into categories as statistical, nature inspired and artificial neural network each with its own benefits and usage in particular cases...
October 2017: 3 Biotech
https://www.readbyqxmd.com/read/28870016/clinical-features-and-treatment-outcomes-of-blastic-plasmacytoid-dendritic-cell-neoplasm-a-single-center-experience-in-korea
#7
Hae Su Kim, Hee-Jin Kim, Sun-Hee Kim, Joon Young Choi, Young Hyeh Ko, Won Seog Kim, Chul Won Jung, Seok Jin Kim
BACKGROUND/AIMS: Blastic plasmacytoid dendritic cell neoplasm (BPDCN) is a rare hematologic malignancy that typically presents in the form of skin manifestations with or without lymph node and bone marrow involvement. Given its rarity and recent recognition as a distinct pathological entity, no standard of treatment exists for this aggressive disease and its prognosis is particularly dismal. METHODS: We retrospectively analyzed clinical features and treatment outcomes of patients who were diagnosed with BPDCN between 2000 and 2014...
September 2017: Korean Journal of Internal Medicine
https://www.readbyqxmd.com/read/28860480/discovery-of-human-like-l-asparaginases-with-potential-clinical-use-by-directed-evolution
#8
Coraline Rigouin, Hien Anh Nguyen, Amanda M Schalk, Arnon Lavie
L-asparaginase is a chemotherapy drug used to treat acute lymphoblastic leukemia (ALL). The main prerequisite for clinical efficacy of L-asparaginases is micromolar KM for asparagine to allow for complete depletion of this amino acid in the blood. Since currently approved L-asparaginases are of bacterial origin, immunogenicity is a challenge, which would be mitigated by a human enzyme. However, all human L-asparaginases have millimolar KM for asparagine. We recently identified the low KM guinea pig L-asparaginase (gpASNase1)...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28855986/treatment-of-relapsed-extranodal-natural-killer-t-cell-lymphoma-with-bortezomib-plus-fludarabine
#9
Chen Chen, Hongmin He
Extranodal NK/T cell lymphoma (ENKL) is a rare entity, associated with an aggressive clinical behavior and poor prognosis. The optimal treatment strategies, particularly for relapsed patients, have not been clearly determined. A 40-year-old female ENKL patient with orbital involvement as the first presentation was initially suspected to have an orbital pseudotumor. When the patient developed disease progression following treatment with methylprednisolone, biopsy of the orbital mass was performed. Histopathological examination of the biopsy specimen was consistent with the diagnosis of ENKL (Ann Arbor stage IE)...
October 2017: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/28851634/molecular-cloning-structural-modeling-and-production-of-recombinant-aspergillus-terreusl-asparaginase-in-escherichia-coli
#10
Hesham Saeed, Hadeer Ali, Hadeer Soudan, Amira Embaby, Amany El-Sharkawy, Aida Farag, Ahmed Hussein, Farid Ataya
l-Asparaginase (EC 3.5.1.1) is an important medical enzyme that catalysis the hydrolysis of l-asparagine to aspartic acid and ammonium. For over four decades l. asparaginase utic agent for the treatment of a variety of lymphoproliferative disorders and lymphoma such as acute lymphoblastic leukemia. In the present study A. terreus full length l. asparaginase gene, 1179bp was optimized for expression in Escherichia coli BL21 (DE3) pLysS. The full length A. terreusl. asparaginase gene encoding a protein of 376 amino acids with estimated molecular weight of 42...
August 26, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28837806/rhodospirillum-rubruml-asparaginase-targets-tumor-growth-by-a-dual-mechanism-involving-telomerase-inhibition
#11
Dmitry D Zhdanov, Vadim S Pokrovsky, Marina V Pokrovskaya, Svetlana S Alexandrova, Mikhail A Eldarov, Dmitry V Grishin, Marsel M Basharov, Yulia A Gladilina, Olga V Podobed, Nikolai N Sokolov
Rhodospirillum rubruml-asparaginase mutant RrA E149R, V150P, F151T (RrA) was previously identified to down-regulate telomerase activity along with catalyzing the hydrolysis of l-asparagine. The aim of this study was to define the effect of prolonged RrA exposure on telomerase activity, maintenance of telomeres and proliferation of cancer cells in vitro and in vivo. RrA could inhibit telomerase activity in SCOV-3, SkBr-3 and A549 human cancer cell lines due to its ability to down-regulate the expression of telomerase catalytic subunit hTERT...
October 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28831914/enhancement-in-biological-activity-of-l-asparginase-by-its-conjugation-on-silica-nanoparticles
#12
Dorsa Golestaneh, Jaleh Varshosaz
BACKGROUND: L-asparaginase is a drug of choice in the treatment of Hodgkin's lymphoma and acute lymphoblastic leukemia. Production of its bioconjugates can increase its half-life, stability and decrease its immunogenicity. OBJECTIVE: The aim of the present study was to immobilize this drug on silica nanoparticles by two different cross-linking agents. METHOD: The drug was conjugated to nanoparticles by two cross-linking agents; 1-ethyl-3-(3-dimethylaminopropyl) carboiimide HCl (EDC) or glutaraldehyde...
August 23, 2017: Recent Patents on Nanotechnology
https://www.readbyqxmd.com/read/28830598/do-immunoglobulin-g-and-immunoglobulin-e-anti-l-asparaginase-antibodies-have-distinct-implications-in-children-with-acute-lymphoblastic-leukemia-a-cross-sectional-study
#13
Gabriela Galindo-Rodríguez, José C Jaime-Pérez, Mario C Salinas-Carmona, Sandra N González-Díaz, Ángeles Castro-Corona, Raúl Cavazos-González, Humberto Treviño-Villarreal, Alberto C Heredia-Salazar, David Gómez-Almaguer
BACKGROUND: l-Asparaginase is essential in the treatment of childhood acute lymphoblastic leukemia. If immunoglobulin G anti-l-asparaginase antibodies develop, they can lead to faster plasma clearance and reduced efficiency as well as to hypersensitivity reactions, in which immunoglobulin E can also participate. This study investigated the presence of immunoglobulin G and immunoglobulin E anti-l-asparaginase antibodies and their clinical associations. METHODS: Under 16-year-old patients at diagnosis of B-cell acute lymphoblastic leukemia confirmed by flow cytometry and treated with a uniform l-asparaginase and chemotherapy protocol were studied...
July 2017: Revista Brasileira de Hematologia e Hemoterapia
https://www.readbyqxmd.com/read/28801829/cloning-and-characterization-of-halomonas-elongata-l-asparaginase-a-promising-chemotherapeutic-agent
#14
Ali Ghasemi, Sedigheh Asad, Mahboubeh Kabiri, Bahareh Dabirmanesh
L-asparaginase has been used in the treatment of patients with acute lymphoblastic leukemia (ALL) for more than 30 years. Rapid clearance of the enzyme from blood stream and its L-glutaminase-dependent neurotoxicity has led to searching for new L-asparaginases with more desirable properties. In the present study, L-asparaginase coding gene of Halomonas elongata was isolated, expressed in Escherichia coli, purified, and characterized. The purified protein was found to have a molecular mass of 39.5 kDa and 1000-folds more activity towards L-asparagine than L-glutamine...
August 11, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28771784/a-qualitative-study-of-decision-making-on-phase-iii-randomized-clinical-trial-participation-in-pediatric-oncology-adolescents-and-parents-perspectives-and-preferences
#15
Marianne Vie Ingersgaard, Morten Tulstrup, Kjeld Schmiegelow, Hanne Baekgaard Larsen
AIM: To explore parents' and adolescents' motives for accepting/declining participation in the ALL2008 trials and adolescents' involvement in the decision-making process. BACKGROUND: Children and adolescents with acute lymphoblastic leukemia treated on the Nordic Society of Paediatric Haematology and Oncology ALL2008 protocol were eligible for two randomizations testing 6-mercaptopurine treatment intensifications to improve efficacy and Asparaginase de-escalation to reduce toxicity...
August 3, 2017: Journal of Advanced Nursing
https://www.readbyqxmd.com/read/28766887/a-cost-analysis-of-individualized-asparaginase-treatment-in-pediatric-acute-lymphoblastic-leukemia
#16
Robin Q H Kloos, Carin A Uyl-de Groot, Raphaële R L van Litsenburg, Gertjan J L Kaspers, Rob Pieters, Inge M van der Sluis
BACKGROUND: Therapeutic drug monitoring (TDM) of asparaginase is necessary to respond to variability in asparaginase activity levels, detect silent inactivation, and distinguish between real allergies and allergic-like reactions with and without asparaginase neutralization, respectively. In this study, the costs of an individualized and fixed asparaginase dosing schedule were compared. PROCEDURE: Patients, treated according to the Dutch Childhood Oncology Group ALL-11 protocol (individualized PEGasparaginase treatment, starting dose: 1,500 IU/m(2) ) or ALL-10 protocol (native Escherichia coli asparaginase followed by 2,500 IU/m(2) PEGasparaginase), were included...
August 2, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/28766374/biotechnological-production-and-practical-application-of-l-asparaginase-enzyme
#17
Archana Vimal, Awanish Kumar
L-asparaginase is a vital enzyme of medical importance, and renowned as a chemotherapeutic agent. The relevance of this enzyme is not only limited as an anti-cancer agent, it also possesses a wide range of medical application. The application includes the antimicrobial property, treatment of infectious diseases, autoimmune diseases, canine and feline cancer. Apart from the health care industry, its significance is also established in the food sector as a food processing agent to reduce the acrylamide concentration...
August 2, 2017: Biotechnology & Genetic Engineering Reviews
https://www.readbyqxmd.com/read/28766184/frequency-and-nature-of-adverse-drug-reactions-due-to-non-prescription-drugs-in-children-a-retrospective-analysis-from-the-french-pharmacovigilance-database
#18
Geneviève Durrieu, Mathieu Maupiler, Vanessa Rousseau, Leila Chebane, François Montastruc, Emmanuelle Bondon-Guitton, Jean-Louis Montastruc
INTRODUCTION: Studies that evaluate the safety of non-prescription drugs in children remain scarce. OBJECTIVES: The aim of the present study was to compare adverse drug reactions (ADRs) due to prescription versus non-prescription drugs in children. METHODS: We conducted a retrospective analysis of ADR notifications for a pediatric population (aged <18 years) registered in the French PharmacoVigilance Database (FPVD) between January 1985 and December 2016 by the Midi-Pyrénées PharmacoVigilance Center (in the south of France)...
August 1, 2017: Paediatric Drugs
https://www.readbyqxmd.com/read/28754100/identifying-genomic-targets-for-protein-over-expression-by-omics-analysis-of-quiescent-escherichia-coli-cultures
#19
Shubhashree Mahalik, Ashish Kumar Sharma, Priyanka Jain, Krishna Jyoti Mukherjee
BACKGROUND: A cellular stress response is triggered upon induction of recombinant protein expression which feedback inhibits both growth as well as protein synthesis. In order to separate these two effects, it was decided to study "quiescent cultures" which continue to be metabolically active and express recombinant proteins even after growth cessation. The idea was to identify and up-regulate genes which are responsible for protein synthesis in the absence of growth. This would ensure that, even if growth were adversely affected post induction, there would be no attendant reduction in the protein expression capability of the cells...
July 28, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28753578/autophagy-suppression-potentiates-the-anti-glioblastoma-effect-of-asparaginase-in-vitro-and-in-vivo
#20
Qicheng Chen, Li Ye, Jiajun Fan, Xuyao Zhang, Huan Wang, Siyang Liao, Ping Song, Ziyu Wang, Shaofei Wang, Yubin Li, Jingyun Luan, Yichen Wang, Wei Chen, Wenjing Zai, Ping Yang, Zhonglian Cao, Dianwen Ju
Asparaginase has been reported to be effective in the treatment of various leukemia and several malignant solid cancers. However, the anti-tumor effect of asparaginase is always restricted due to complicated mechanisms. Herein, we investigated the mechanisms of how glioblastoma resisted asparaginase treatment and reported a novel approach to enhance the anti-glioblastoma effect of asparaginase. We found that asparaginase could induce growth inhibition and caspase-dependent apoptosis in U87MG/U251MG glioblastoma cells...
July 20, 2017: Oncotarget
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