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l-asparaginase

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https://www.readbyqxmd.com/read/28105864/expression-and-purification-of-l-asparaginase-from-escherichia-coli-and-the-inhibitory-effects-of-cyclic-dipeptides
#1
Yanan Zhang, Dan Li, Yan Li
L-asparaginase, a key enzyme involved in nitrogen metabolism, is an effective anti-tumour agent. Cyclic dipeptides, a group of compounds, contain several important biological functions. In this paper, we proposed a novel method for L-asparaginase expression and purification from Echerichia coli and determined the effect of cyclic dipeptides on the enzymatic activity of recombinant L-asparaginase. The gene ansB encoding L-asparaginase was amplified from the genome of E. coli BL21 (DE3) by polymerase chain reaction and sub-cloned into pET-15b vector to construct expressing plasmid pET-15b-ansB...
January 20, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28101462/identification-and-molecular-characterization-of-genes-coding-pharmaceutically-important-enzymes-from-halo-thermo-tolerant-bacillus
#2
Azam Safary, Rezvan Moniri, Maryam Hamzeh-Mivehroud, Siavoush Dastmalchi
Purpose: Robust pharmaceutical and industrial enzymes from extremophile microorganisms are main source of enzymes with tremendous stability under harsh conditions which make them potential tools for commercial and biotechnological applications. Methods: The genome of a Gram-positive halo-thermotolerant Bacillus sp. SL1, new isolate from Saline Lake, was investigated for the presence of genes coding for potentially pharmaceutical enzymes. We determined gene sequences for the enzymes laccase (CotA), l-asparaginase (ansA3, ansA1), glutamate-specific endopeptidase (blaSE), l-arabinose isomerase (araA2), endo-1,4-β mannosidase (gmuG), glutaminase (glsA), pectate lyase (pelA), cellulase (bglC1), aldehyde dehydrogenase (ycbD) and allantoinases (pucH) in the genome of Bacillus sp...
December 2016: Advanced Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28100766/comparison-of-a-chop-lasp-based-protocol-with-and-without-maintenance-for-canine-multicentric-lymphoma
#3
E M Lautscham, M Kessler, T Ernst, L Willimzig, R Neiger
The recommendation to treat canine lymphoma with a discontinuous protocol is based on small case numbers and mostly historic controls. This study compares duration of first remission (DFR) and overall survival time (ST) with a discontinuous protocol to the same protocol with maintenance phase. 408 dogs were treated with a CHOP-LAsp (C=cyclophosphamide; H=hydroxydaunorubicin; O=Oncovin; P=prednisolone; LAsp=l-asparaginase)-based 28-week induction protocol. In 75 dogs (cohort 1), this was followed by a maintenance phase consisting of vincristine, chlorambucil and actinomycin-D with a total treatment duration of two years...
January 18, 2017: Veterinary Record
https://www.readbyqxmd.com/read/28060110/antithrombin-iii-as-the-indicator-of-l-asparaginase-activity-in-children-treated-for-acute-lymphoblastic-leukemia
#4
Małgorzata Czogała, Walentyna Balwierz, Krystyna Sztefko, Iwona Rogatko
L-asparaginase (ASP) is widely used in the treatment of acute lymphoblastic leukemia (ALL) in children. Monitoring its activity is necessary because of the risk of drug inactivation as the result of an immune reaction. Besides allergic reactions, another frequent side effect of ASP treatment is coagulopathy, especially deficiency of antithrombin III (ATIII). The aim of this study was to analyze the relationship between ASP and ATIII activities and the possibility of ATIII activity use in an indirect ASP activity assessment...
January 5, 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/28034070/treatments-and-outcomes-of-patients-with-extranodal-natural-killer-t-cell-lymphoma-diagnosed-between-2000-and-2013-a-cooperative-study-in-japan
#5
Motoko Yamaguchi, Ritsuro Suzuki, Masahiko Oguchi, Naoko Asano, Jun Amaki, Takeshi Akiba, Takeshi Maeda, Satoshi Itasaka, Nobuko Kubota, Yoshihiro Saito, Yukio Kobayashi, Jun Itami, Kyoko Ueda, Kana Miyazaki, Noriko Ii, Naoto Tomita, Nodoka Sekiguchi, Jun Takizawa, Bungo Saito, Tohru Murayama, Toshihiko Ando, Hideho Wada, Rie Hyo, Yasuo Ejima, Masatoshi Hasegawa, Naoyuki Katayama
Purpose To elucidate the management and outcomes of patients with extranodal natural killer/T-cell lymphoma, nasal type (ENKL), who were diagnosed between 2000 and 2013 in Japan. Patients and Methods Data from 358 patients with ENKL diagnosed between 2000 and 2013 from 31 institutes were retrospectively analyzed. Results Patients' median age was 58 years, and 257 (72%) had localized disease. The most common first-line treatment was radiotherapy with dexamethasone, etoposide, ifosfamide, and carboplatin (RT-DeVIC) (66%) for localized ENKL and L-asparaginase-containing chemotherapy (30%) for advanced ENKL...
January 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28003999/synergistic-cytotoxic-effect-of-l-asparaginase-combined-with-decitabine-as-a-demethylating-agent-in-pediatric-t-all-with-specific-epigenetic-signature
#6
Salvatore Serravalle, Salvatore N Bertuccio, Annalisa Astolfi, Fraia Melchionda, Andrea Pession
T-Acute Lymphoblastic Leukemia (T-ALL) remains a subgroup of pediatric ALL, with a lower response to standard chemotherapy. Some recent studies established the fundamental role of epigenetic aberrations such as DNA hypermethylation, to influence patients' outcome and response to chemotherapy. Moreover, L-asparaginase is an important chemotherapeutic agent for treatment of ALL and resistance to this drug has been linked to ASNS expression, which can be silenced through methylation. Therefore, we tested whether the sensitivity of T-ALL cell lines towards L-asparaginase is correlated to the epigenetic status of ASNS gene and whether the sensitivity can be modified by concurrent demethylating treatment...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27999622/purification-characterization-and-comparison-between-two-new-l-asparaginases-from-bacillus-pg03-and-bacillus-pg04
#7
Mahsa Rahimzadeh, Manijeh Poodat, Sedigheh Javadpour, Fatemeh Izadpanah Qeshmi, Fereshteh Shamsipour
BACKGROUND: L-asparaginase has been used as a chemotherapeutic agent in treatment of lymphoblastic leukemia. In the present investigation, Bacillus sp. PG03 and Bacillus sp. PG04 were studied. METHODS: L- asparaginases were produced using different culture media and were purified using ion exchange chromatography. RESULTS: Maximum productivity was obtained when asparagine was used as the nitrogen source at pH 7 and 48 h after cultivation. New intracellular L-asparaginases showed an apparent molecular weight of 25 kDa and 30 kDa by SDS-PAGE respectively...
2016: Open Biochemistry Journal
https://www.readbyqxmd.com/read/27997540/il-7-receptor-mutations-and-steroid-resistance-in-pediatric-t-cell-acute-lymphoblastic-leukemia-a-genome-sequencing-study
#8
Yunlei Li, Jessica G C A M Buijs-Gladdines, Kirsten Canté-Barrett, Andrew P Stubbs, Eric M Vroegindeweij, Willem K Smits, Ronald van Marion, Winand N M Dinjens, Martin Horstmann, Roland P Kuiper, Rogier C Buijsman, Guido J R Zaman, Peter J van der Spek, Rob Pieters, Jules P P Meijerink
BACKGROUND: Pediatric acute lymphoblastic leukemia (ALL) is the most common childhood cancer and the leading cause of cancer-related mortality in children. T cell ALL (T-ALL) represents about 15% of pediatric ALL cases and is considered a high-risk disease. T-ALL is often associated with resistance to treatment, including steroids, which are currently the cornerstone for treating ALL; moreover, initial steroid response strongly predicts survival and cure. However, the cellular mechanisms underlying steroid resistance in T-ALL patients are poorly understood...
December 2016: PLoS Medicine
https://www.readbyqxmd.com/read/27972454/cost-minimization-analysis-of-peg-l-asparginase-versus-e-coli-l-asparaginase-in-pediatric-acute-lymphoblastic-leukemia-all-patients-a-jordanian-perspective
#9
Al Rabayah, S Jaddouh, A Amireh
No abstract text is available yet for this article.
November 2016: Value in Health: the Journal of the International Society for Pharmacoeconomics and Outcomes Research
https://www.readbyqxmd.com/read/27941739/incidence-of-hyperglycemia-during-induction-of-remission-phase-of-pediatric-acute-lymphoblastic-leukemia
#10
R Laila, A Islam, M M Bhuiyan
Hyperglycemia is frequently associated with acute lymphoblastic leukemia (ALL) therapy. It has long been recognized as a consequence of corticosteroids and asparaginase. These medications are usually administrated concurrently in high doses during the initial induction phase of chemotherapy. As a result, hyperglycemia frequently develops during this phase, with resolution after the steroids and asparaginase have been discontinued or reduced in dose. Various recent studies have evaluated the incidence of hyperglycemia in this particular group of patients and its relationship with chemotherapy...
October 2016: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/27920886/evaluation-of-recombinant-human-growth-hormone-secretion-in-e-coli-using-the-l-asparaginase-ii-signal-peptide
#11
Mozhdeh Zamani, Navid Nezafat, Younes Ghasemi
BACKGROUND: In the recent years, there has been an increasing interest in secretory production of recombinant proteins, due to its various advantages compared with intracellular expression. Signal peptides play a critical role in prosperous secretion of recombinant proteins. Accordingly, different signal peptides have been assessed for their ability to produce secretory proteins by trial-and-error experiments. The aim of this study was to evaluate the effect of L-asparaginase II signal peptide on the recombinant human Growth Hormone (hGH) protein secretion in the Escherichia coli (E...
October 2016: Avicenna Journal of Medical Biotechnology
https://www.readbyqxmd.com/read/27919811/biochemical-characterization-of-a-novel-l-asparaginase-from-paenibacillus-barengoltzii-being-suitable-for-acrylamide-reduction-in-potato-chips-and-mooncakes
#12
Ran Shi, Yu Liu, Qing Mu, Zhengqiang Jiang, Shaoqing Yang
A novel L-asparaginase gene (PbAsnase) from Paenibaeillus barengoltzii CAU904 was cloned and expressed in Escherichia coli. The L-asparaginase gene was 1011bp encoding 336 amino acids. Multiple sequence alignment of PbAsnase with other known L-asparaginases revealed that the enzyme showed high similarities with some Rhizobial-type L-asparaginases, sharing the highest identity of 32% with a characterized L-asparaginase from Rhizobium etli CFN 42, suggesting that it should be a novel L-asparaginase. The recombinant L-asparaginase (PbAsnase) was purified to homogeneity and biochemically characterized...
December 2, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27908241/molecular-cloning-biochemical-characterization-and-antitumor-properties-of-a-novel-l-asparaginase-from-synechococcus-elongatus-pcc6803
#13
R Kebeish, A El-Sayed, H Fahmy, A Abdel-Ghany
L-asparaginase (EC 3.5.1.1), which catalyzes the deamidation of L-asparagine to L-aspartic acid and ammonia, has been widely used as a key therapeutic tool in the treatment of tumors. The current commercially available L-asparaginases, produced from bacteria, have signs of toxicity and hypersensitivity reactions during the course of tumor therapy. Therefore, searching for L-asparaginases with unique biochemical properties and fewer adverse effects was the objective of this work. In this study, cyanobacterial strain Synechococcus elongatus PCC6803 was found as a novel source of L-asparaginase...
October 2016: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/27902457/tfdp3-confers-chemoresistance-in-minimal-residual-disease-within-childhood-t-cell-acute-lymphoblastic-leukemia
#14
Ming Chu, Kailin Yin, Yujun Dong, Pingzhang Wang, Yun Xue, Peng Zhou, Yuqi Wang, Yuedan Wang
Acquired drug resistance in childhood T-cell acute lymphoblastic leukemia (T-ALL) remains a significant clinical problem. In this study, a novel gene therapy target for childhood T-ALL to overcome chemoresistance was discovered: TFDP3 increased in the minimal residual disease (MRD) positive childhood T-ALL patients. Then, we established a preclinical model of resistance to induction therapy to examine the functional relevance of TFDP3 to chemoresistance in MRD derived from Jurkat/E6-1. Jurkat xenografts in NOD/SCID mice were exposed to a four drug combination (VXLD) of vincristine (VCR), dexamethasone (DEX), L-asparaginase (L-asp) and daunorubicin (DNR)...
November 26, 2016: Oncotarget
https://www.readbyqxmd.com/read/27895780/curcumin-potentiates-the-effect-of-chemotherapy-against-acute-lymphoblastic-leukemia-cells-via-downregulation-of-nf-%C3%AE%C2%BAb
#15
Helia Judith Pimentel-Gutiérrez, Lucina Bobadilla-Morales, César Cenobio Barba-Barba, Citlalli Ortega-De-La-Torre, Fernando Antonio Sánchez-Zubieta, Jorge Román Corona-Rivera, Betsy Annel González-Quezada, Juan S Armendáriz-Borunda, Rocío Silva-Cruz, Alfredo Corona-Rivera
Acute lymphoblastic leukemia (ALL) accounts for 30% of all pediatric cancers. Currently available treatments exhibit toxicity and certain patients may develop resistance. Thus, less toxic and chemoresistance-reversal agents are required. In the present study, the potential effect of curcumin, a component of Curcuma longa, as a pharmacological co-adjuvant of several chemotherapeutic agents against ALL, including prednisone, 6-mercaptopurine, dexamethasone, cyclophosphamide, l-asparaginase, vincristine, daunorubicin, doxorubicin, methotrexate and cytarabine, was investigated in the REH ALL cell line cultures treated in combination with chemotherapeutic agents and curcumin...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27885727/growth-inhibitory-and-proapoptotic-effects-of-l-asparaginase-from-fusarium-culmorum-asp-87-on-human-leukemia-cells-jurkat
#16
Anil K Meghavarnam, Maryam Salah, Meenakshisundaram Sreepriya, Savitha Janakiraman
The objective of this study was to evaluate the anticancer properties of l-asparaginase purified from fungal isolate Fusarium culmorum ASP-87 against human T-cell leukemia cell line (Jurkat). The growth inhibitory and proapoptotic effects of purified l-asparaginase on Jurkat cell lines were investigated by determining its influence on cell viability, colony formation, DNA fragmentation, and cell cycle progression. The results revealed that purified l-asparaginase showed significant decrease in cell survival with IC50 value of 90 μg/mL (9 IU/mL)...
November 25, 2016: Fundamental & Clinical Pharmacology
https://www.readbyqxmd.com/read/27866936/current-applications-and-different-approaches-for-microbial-l-asparaginase-production
#17
REVIEW
Jorge Javier Muso Cachumba, Felipe Antonio Fernandes Antunes, Guilherme Fernando Dias Peres, Larissa Pereira Brumano, Júlio César Dos Santos, Silvio Silvério Da Silva
l-asparaginase (EC 3.5.1.1) is an enzyme that catalysis mainly the asparagine hydrolysis in l-aspartic acid and ammonium. This enzyme is presented in different organisms, such as microorganisms, vegetal, and some animals, including certain rodent's serum, but not unveiled in humans. It can be used as important chemotherapeutic agent for the treatment of a variety of lymphoproliferative disorders and lymphomas (particularly acute lymphoblastic leukemia (ALL) and Hodgkin's lymphoma), and has been a pivotal agent in chemotherapy protocols from around 30 years...
December 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/27863173/heterologous-expression-and-purification-of-active-l-asparaginase-i-of-saccharomyces-cerevisiae-in-escherichia-coli-host
#18
João H P M Santos, Iris M Costa, João V D Molino, Mariana S M Leite, Marcela V Pimenta, João A P Coutinho, Adalberto Pessoa, Sónia P M Ventura, André M Lopes, Gisele Monteiro
L-asparaginase (ASNase) is a biopharmaceutical widely used to treat child leukemia. However, it presents some side effects, and in order to provide an alternative biopharmaceutical, in this work, the genes encoding ASNase from Saccharomyces cerevisiae (Sc_ASNaseI and Sc_ASNaseII) were cloned in the prokaryotic expression system Escherichia coli. In the 93 different expression conditions tested, the Sc_ASNaseII protein was always obtained as an insoluble and inactive form. However, the Sc_ASNaseI (His)6 -tagged recombinant protein was produced in large amounts in the soluble fraction of the protein extract...
November 14, 2016: Biotechnology Progress
https://www.readbyqxmd.com/read/27849183/contribution-of-asparagine-catabolism-to-salmonella-virulence
#19
Patrick A McLaughlin, Michael McClelland, Hee-Jeong Yang, Steffen Porwollik, Lydia Bogomolnaya, Juei-Suei Chen, Helene Andrews-Polymenis, Adrianus W M van der Velden
Salmonellae are pathogenic bacteria that cause significant morbidity and mortality in humans worldwide. Salmonellae establish infection and avoid clearance by the immune system by mechanisms that are not well understood. We previously showed that L-Asparaginase II produced by Salmonella enterica serovar Typhimurium (S Typhimurium) inhibits T cell responses and mediates virulence. In addition, we previously showed that asparagine deprivation such as that mediated by L-Asparaginase II of S Typhimurium causes suppression of activation-induced T cell metabolic reprogramming...
November 14, 2016: Infection and Immunity
https://www.readbyqxmd.com/read/27844015/l-asparaginase-production-in-the-pseudomonas-pseudoalcaligenes-strain-jhs-71-isolated-from-jooshan-hot-spring
#20
Arastoo Badoei-Dalfard
L-asparaginase has lots of medical and industrial applications. Ever since L-asparaginase anti-tumor activity was first demonstrated, its production using microbial systems has attracted considerable attention owing to their cost-effective and eco-friendly nature. The aim of this study is to obtain L-asparaginase producing bacteria and determining the enzyme activity. Samples were picked up from Jooshan hot springs located in the Sirch, Kerman. The L-asparaginase producing bacteria were screened on the agar medium supplied with L-asparagine and phenol red indicator dye (pH-7...
March 2016: Molecular Biology Research Communications
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