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https://www.readbyqxmd.com/read/28344156/enhancing-fructooligosaccharides-production-by-genetic-improvement-of-the-industrial-fungus-aspergillus-niger-atcc-20611
#1
Jing Zhang, Caixia Liu, Yijia Xie, Ning Li, Zhanguo Ning, Na Du, Xirong Huang, Yaohua Zhong
Aspergillus niger ATCC20611 is one of the most potent filamentous fungi used commercially for production of fructooligosaccharides (FOS), which are prospective components of functional food by stimulating probiotic bacteria in the human gut. However, current strategies for improving FOS yield still rely on production process development. The genetic engineering approach hasn't been applied in industrial strains to increase FOS production level. Here, an optimized polyethylene glycol (PEG)-mediated protoplast transformation system was established in A...
March 23, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28336855/behavior-and-potential-impacts-of-metal-based-engineered-nanoparticles-in-aquatic-environments
#2
REVIEW
Cheng Peng, Wen Zhang, Haiping Gao, Yang Li, Xin Tong, Kungang Li, Xiaoshan Zhu, Yixiang Wang, Yongsheng Chen
The specific properties of metal-based nanoparticles (NPs) have not only led to rapidly increasing applications in various industrial and commercial products, but also caused environmental concerns due to the inevitable release of NPs and their unpredictable biological/ecological impacts. This review discusses the environmental behavior of metal-based NPs with an in-depth analysis of the mechanisms and kinetics. The focus is on knowledge gaps in the interaction of NPs with aquatic organisms, which can influence the fate, transport and toxicity of NPs in the aquatic environment...
January 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28330725/a-botanical-phytochemical-and-ethnomedicinal-review-of-the-genus-mitragyna-korth-implications-for-products-sold-as-kratom
#3
REVIEW
Paula N Brown, Jensen A Lund, Susan J Murch
ETHNOPHARMACOLOGICAL RELEVANCE: The genus Mitragyna (Rubiacaeae) has been traditionally used in parts of Africa, Asia and Oceania. In recent years, there has been increased interest in species of Mitragyna with the introduction of products to western markets and regulatory uncertainty. AIM OF THE STUDY: This paper reviewed the traditional ethnomedicinal uses of leaves for species belonging to the genus Mitragyna with reference to the botany and known chemistry in order to highlight areas of interest for products currently being sold as kratom...
March 18, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28330254/enhanced-production-of-an-anti-malarial-compound-artesunate-by-hairy-root-cultures-and-phytochemical-analysis-of-artemisia-pallens-wall
#4
Zarna Pala, Vishnu Shukla, Anshu Alok, Subhash Kudale, Neetin Desai
Artemisinin and its derivatives are still one of the most effective drugs for the treatment of malaria. Artemisia pallens commonly known as Dhavanam, is an aromatic herb belonging to the family Asteraceae. Increasing the artemisinin content of A. pallens by genetic engineering would improve the availability of this much needed drug. In the present study, Agrobacterium rhizogenes (strain NCIM 5140) mediated genetic transformation of Artemisia pallens were carried out for hairy root induction. The effect of different media (Half MS, MS, MS along with BAP 0...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28325289/specific-and-stable-suppression-of-hiv-provirus-expression-in%C3%A2-vitro-by-chimeric-zinc-finger-dna-methyltransferase-1
#5
Junxiao Deng, Xiying Qu, Panpan Lu, Xinyi Yang, Yuqi Zhu, Haiyan Ji, Yanan Wang, Zhengtao Jiang, Xian Li, Yangcheng Zhong, He Yang, Hanyu Pan, Won-Bin Young, Huanzhang Zhu
HIV-1 inserts its proviral DNA into the infected host cells, by which HIV proviral DNA can then be duplicated along with each cell division. Thus, provirus cannot be eradicated completely by current antiretroviral therapy. We have developed an innovative strategy to silence the HIV provirus by targeted DNA methylation on the HIV promoter region. We genetically engineered a chimeric DNA methyltransferase 1 composed of designed zinc-finger proteins to become ZF2 DNMT1. After transient transfection of the molecular clone encoding this chimeric protein into HIV-1 infected or latently infected cells, efficient suppression of HIV-1 expression by the methylation of CpG islands in 5'-LTR was observed and quantified...
March 17, 2017: Molecular Therapy. Nucleic Acids
https://www.readbyqxmd.com/read/28324236/efficient-de-novo-synthesis-of-resveratrol-by-metabolically-engineered-escherichia-coli
#6
Junjun Wu, Peng Zhou, Xia Zhang, Mingsheng Dong
Resveratrol has been the subject of numerous scientific investigations due to its health-promoting activities against a variety of diseases. However, developing feasible and efficient microbial processes remains challenging owing to the requirement of supplementing expensive phenylpropanoic precursors. Here, various metabolic engineering strategies were developed for efficient de novo biosynthesis of resveratrol. A recombinant malonate assimilation pathway from Rhizobium trifolii was introduced to increase the supply of the key precursor malonyl-CoA and simultaneously, the clustered regularly interspaced short palindromic repeats interference system was explored to down-regulate fatty acid biosynthesis pathway to inactivate the malonyl-CoA consumption pathway...
March 21, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28317440/potent-immune-responses-induced-by-a-salmonella-ghost-delivery-system-that-expresses-the-recombinant-stx2eb-fedf-and-feda-proteins-of-the-escherichia-coli-producing-f18-and-shiga-toxin-in-a-murine-model-and-evaluation-of-its-protective-effect-as-a-porcine-vaccine
#7
Gayeon Won, John Hwa Lee
BACKGROUND: In the pathogenicity of porcine edema disease, which is caused by the Escherichia coli-producing F18 and Shiga toxin, F18(+) fimbrial adhesins and Shiga toxin 2e (Stx2e) play pivotal roles in the colonization and enterotoxicity of this pathogen. OBJECTIVE: To develop a vaccine candidate against edema disease by combining three selected antigens of F18(+) Shiga toxin-producing Escherichia coli (STEC). METHODS: Genetically engineered Salmonella Typhimurium (ST) ghosts that express Stx2eB, FedF, and FedA were individually inserted in a ghost plasmid cassette (pJHL184), and the resultant plasmids were transformed into a Δasd Δlon ΔcpxR ST (JOL912)...
March 20, 2017: Veterinary Quarterly
https://www.readbyqxmd.com/read/28315745/production-of-low-expressing-recombinant-cationic-biopolymers-with-high-purity
#8
Xuguang Chen, Alireza Nomani, Niket Patel, Arash Hatefi
The growing complexity of recombinant biopolymers for delivery of bioactive agents requires the ability to control the biomaterial structure with high degree of precision. Genetic engineering techniques have provided this opportunity to synthesize biomaterials in an organism such as E. coli with full control over their lengths and sequences. One class of such biopolymers is recombinant cationic biopolymers with applications in gene delivery, regenerative medicine and variety of other biomedical applications...
March 16, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28315412/engineering-bacterial-translation-initiation-do-we-have-all-the-tools-we-need
#9
REVIEW
Justin Vigar, Hans-Joachim Wieden
BACKGROUND: Reliable tools that allow precise and predictable control over gene expression are critical for the success of nearly all bioengineering applications. Translation initiation is the most regulated phase during protein biosynthesis, and is therefore a promising target for exerting control over gene expression. At the translational level, the copy number of a protein can be fine-tuned by altering the interaction between the translation initiation region of an mRNA and the ribosome...
March 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28303661/immunological-and-physiological-observations-in-baboons-with-life-supporting-genetically-engineered-pig-kidney-grafts
#10
Hayato Iwase, Hidetaka Hara, Mohamed Ezzelarab, Tao Li, Zhongqiang Zhang, Bingsi Gao, Hong Liu, Cassandra Long, Yi Wang, Amy Cassano, Edwin Klein, Carol Phelps, David Ayares, Abhinav Humar, Martin Wijkstrom, David K C Cooper
BACKGROUND: Genetically engineered pigs could provide a source of kidneys for clinical transplantation. The two longest kidney graft survivals reported to date have been 136 and 310 days, but graft survival >30 days has been unusual until recently. METHODS: Donor pigs (n=4) were on an α1,3-galactosyltransferase gene-knockout (GTKO)/human complement regulatory protein (CD46) background (GTKO/CD46). In addition, the pigs were transgenic for at least one human coagulation regulatory protein...
March 17, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28302645/pd-l1-on-tumor-cells-is-sufficient-for-immune-evasion-in-immunogenic-tumors-and-inhibits-cd8-t-cell-cytotoxicity
#11
Vikram R Juneja, Kathleen A McGuire, Robert T Manguso, Martin W LaFleur, Natalie Collins, W Nicholas Haining, Gordon J Freeman, Arlene H Sharpe
It is unclear whether PD-L1 on tumor cells is sufficient for tumor immune evasion or simply correlates with an inflamed tumor microenvironment. We used three mouse tumor models sensitive to PD-1 blockade to evaluate the significance of PD-L1 on tumor versus nontumor cells. PD-L1 on nontumor cells is critical for inhibiting antitumor immunity in B16 melanoma and a genetically engineered melanoma. In contrast, PD-L1 on MC38 colorectal adenocarcinoma cells is sufficient to suppress antitumor immunity, as deletion of PD-L1 on highly immunogenic MC38 tumor cells allows effective antitumor immunity...
March 16, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28300077/translational-reprogramming-in-tumour-cells-can-generate-oncoselectivity-in-viral-therapies
#12
Eneko Villanueva, Pilar Navarro, Maria Rovira-Rigau, Annarita Sibilio, Raúl Méndez, Cristina Fillat
Systemic treatment of cancer requires tumour-selective therapies that eliminate cancer cells yet preserve healthy tissues from undesired damage. Tumoral transformation is associated with profound effects in translational reprogramming of gene expression, such that tumour-specific translational regulation presents an attractive possibility for generating oncoselective therapies. We recently discovered that mRNA translational control by cytoplasmic polyadenylation element-binding proteins (CPEBs) is reactivated in cancer...
March 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28298917/arsenic-transport-in-rice-and-biological-solutions-to-reduce-arsenic-risk-from-rice
#13
REVIEW
Yanshan Chen, Yong-He Han, Yue Cao, Yong-Guan Zhu, Bala Rathinasabapathi, Lena Q Ma
Rice (Oryza sativa L.) feeds ∼3 billion people. Due to the wide occurrence of arsenic (As) pollution in paddy soils and its efficient plant uptake, As in rice grains presents health risks. Genetic manipulation may offer an effective approach to reduce As accumulation in rice grains. The genetics of As uptake and metabolism have been elucidated and target genes have been identified for genetic engineering to reduce As accumulation in grains. Key processes controlling As in grains include As uptake, arsenite (AsIII) efflux, arsenate (AsV) reduction and AsIII sequestration, and As methylation and volatilization...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28298605/cxcr5-dependent-entry-of-cd8-t-cells-into-rhesus-macaque-b-cell-follicles-achieved-through-t-cell-engineering
#14
Victor I Ayala, Claire Deleage, Matthew T Trivett, Sumiti Jain, Lori V Coren, Matthew W Breed, Joshua A Kramer, James A Thomas, Jacob D Estes, Jeffrey D Lifson, David E Ott
Follicular helper CD4 T cells, TFH, residing in B-cell follicles within secondary lymphoid tissues, are readily infected by AIDS viruses and are a major source of persistent virus despite relative control of viral replication. This persistence is due at least in part to a relative exclusion of effective antiviral CD8 T cells from B-cell follicles. To determine whether CD8 T cells could be engineered to enter B-cell follicles, we genetically modified unselected CD8 T cells to express CXCR5, the chemokine receptor implicated in cellular entry into B-cell follicles...
March 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28289710/targeting-adhesion-signaling-in-kras-lkb1-mutant-lung-adenocarcinoma
#15
Melissa Gilbert-Ross, Jessica Konen, Junghui Koo, John Shupe, Brian S Robinson, Walter Guy Wiles, Chunzi Huang, W David Martin, Madhusmita Behera, Geoffrey H Smith, Charles E Hill, Michael R Rossi, Gabriel L Sica, Manali Rupji, Zhengjia Chen, Jeanne Kowalski, Andrea L Kasinski, Suresh S Ramalingam, Haian Fu, Fadlo R Khuri, Wei Zhou, Adam I Marcus
Loss of LKB1 activity is prevalent in KRAS mutant lung adenocarcinoma and promotes aggressive and treatment-resistant tumors. Previous studies have shown that LKB1 is a negative regulator of the focal adhesion kinase (FAK), but in vivo studies testing the efficacy of FAK inhibition in LKB1 mutant cancers are lacking. Here, we took a pharmacologic approach to show that FAK inhibition is an effective early-treatment strategy for this high-risk molecular subtype. We established a lenti-Cre-induced Kras and Lkb1 mutant genetically engineered mouse model (KLLenti) that develops 100% lung adenocarcinoma and showed that high spatiotemporal FAK activation occurs in collective invasive cells that are surrounded by high levels of collagen...
March 9, 2017: JCI Insight
https://www.readbyqxmd.com/read/28289314/nonlinear-ultrasound-imaging-of-nanoscale-acoustic-biomolecules
#16
David Maresca, Anupama Lakshmanan, Audrey Lee-Gosselin, Johan M Melis, Yu-Li Ni, Raymond W Bourdeau, Dennis M Kochmann, Mikhail G Shapiro
Ultrasound imaging is widely used to probe the mechanical structure of tissues and visualize blood flow. However, the ability of ultrasound to observe specific molecular and cellular signals is limited. Recently, a unique class of gas-filled protein nanostructures called gas vesicles (GVs) was introduced as nanoscale (∼250 nm) contrast agents for ultrasound, accompanied by the possibilities of genetic engineering, imaging of targets outside the vasculature and monitoring of cellular signals such as gene expression...
February 13, 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/28288329/gm-biofortified-crops-potential-effects-on-targeting-the-micronutrient-intake-gap-in-human-populations
#17
REVIEW
Hans De Steur, Saurabh Mehta, Xavier Gellynck, Julia L Finkelstein
Genetic engineering has been successfully applied to increase micronutrient content in staple crops. Nutrition evidence is key to ensure scale-up and successful implementation. Unlike conventional plant breeding efforts, research on the efficacy or effectiveness of GM biofortified crops on nutritional status in human populations is lacking. This review reports on the potential role of GM biofortified crops in closing the micronutrient gap - increasing the dietary intake of micronutrients in human populations...
March 10, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28286408/antinociceptive-effect-of-intrathecal-injection-of-genetically-engineered-human-bone-marrow-stem-cells-expressing-the-human-proenkephalin-gene-in-a-rat-model-of-bone-cancer-pain
#18
Yi Sun, Yuke Tian, Haifeng Li, Dengwen Zhang, Qiang Sun
Background. This study aimed to investigate the use of human bone marrow mesenchymal stem cells (hBMSCs) genetically engineered with the human proenkephalin (hPPE) gene to treat bone cancer pain (BCP) in a rat model. Methods. Primary cultured hBMSCs were passaged and modified with hPPE, and the cell suspensions (6 × 10(6)) were then intrathecally injected into a rat model of BCP. Paw mechanical withdrawal threshold (PMWT) was measured before and after BCP. The effects of hPPE gene transfer on hBMSC bioactivity were analyzed in vitro and in vivo...
2017: Pain Research & Management: the Journal of the Canadian Pain Society
https://www.readbyqxmd.com/read/28284882/current-findings-on-the-role-of-oxytocin-in-the-regulation-of-food-intake
#19
REVIEW
Maartje S Spetter, Manfred Hallschmid
In the face of the alarming prevalence of obesity and its associated metabolic impairments, it is of high basic and clinical interest to reach a complete understanding of the central nervous pathways that establish metabolic control. In recent years, the hypothalamic neuropeptide oxytocin, which is primarily known for its involvement in psychosocial processes and reproductive behavior, has received increasing attention as a modulator of metabolic function. Oxytocin administration to the brain of normal-weight animals, but also animals with diet-induced or genetically engineered obesity reduces food intake and body weight, and can also increase energy expenditure...
March 8, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28283693/genetically-engineered-escherichia-coli-nissle-1917-synbiotic-counters-fructose-induced-metabolic-syndrome-and-iron-deficiency
#20
Archana Somabhai Chaudhari, Ruma Raghuvanshi, G Naresh Kumar
Consumption of fructose leads to metabolic syndrome, but it is also known to increase iron absorption. Present study investigates the effect of genetically modified Escherichia coli Nissle 1917 (EcN) synbiotic along with fructose on non-heme iron absorption. Charles foster rats weighing 150-200 g were fed with iron-deficient diet for 2 months. Probiotic treatment of EcN (pqq) and EcN (pqq-glf-mtlK) was given once per week, 10(9) cells after 2 months with fructose in drinking water. Iron levels, blood, and liver parameters for oxidative stress, hyperglycemia, and dyslipidemia were estimated...
March 10, 2017: Applied Microbiology and Biotechnology
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