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Biotechnology Letters

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https://www.readbyqxmd.com/read/28405836/chondrogenesis-and-hypertrophy-in-response-to-aggregate-behaviors-of-human-mesenchymal-stem-cells-on-a-dendrimer-immobilized-surface
#1
Sopita Wongin, Yuuki Ogawa, Mee-Hae Kim, Kwanchanok Viravaidya-Pasuwat, Masahiro Kino-Oka
OBJECTIVES: To investigate the behaviors of aggregates of human mesenchymal stem cells (hMSCs) on chondrogenesis and chondrocyte hypertrophy using spatiotemporal expression patterns of chondrogenic (type II collagen) and hypertrophic (type X collagen) markers during chondrogenesis. RESULTS: hMSCs were cultured on either a polystyrene surface or polyamidoamine dendrimer surface with a fifth generation (G5) dendron structure in chondrogenic medium and growth medium...
April 12, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28405835/high-yield-production-of-pure-tagatose-from-fructose-by-a-three-step-enzymatic-cascade-reaction
#2
Seon-Hwa Lee, Seung-Hye Hong, Kyoung-Rok Kim, Deok-Kun Oh
OBJECTIVE: To produce tagatose from fructose with a high conversion rate and to establish a high-yield purification method of tagatose from the reaction mixture. RESULTS: Fructose at 1 M (180 g l(-1)) was converted to 0.8 M (144 g l(-1)) tagatose by a three-step enzymatic cascade reaction, involving hexokinase, plus ATP, fructose-1,6-biphosphate aldolase, phytase, over 16 h with a productivity of 9 g l(-1) h(-1). No byproducts were detected. Tagatose was recrystallized from ethanol to a purity of 99...
April 12, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28396958/the-function-and-magnetic-resonance-imaging-of-immature-dendritic-cells-under-ultrasmall-superparamagnetic-iron-oxide-uspio-labeling
#3
Wei Zhang, Shuihua Zhang, Wan Xu, Min Zhang, Quan Zhou, Wenli Chen
OBJECTIVE: To investigate the effects of ultrasmall superparamagnetic iron oxide (USPIO) labeling on the maturity or immune tolerance of immature dendritic cells (imDCs) as the success of immunotherapy with immature dendritic cells is highly dependent on immune tolerance. RESULTS: The feasibility of tracking implanted USPIO-labeled imDCs in vivo by magnetic resonance imaging (MRI) was explored. The effects of USPIO labeling on the immune tolerance of imDCs was examined...
April 10, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28386736/an-efficient-rapid-system-for-assaying-hbx-mediated-transactivation
#4
Xiaoling Zhou, Haijun Shi, Shaozhe Yang, Pingnan Sun
OBJECTIVES: To develop a rapid and accurate assay system for screening inhibitors or enhancing agents targeting the transactivation capability of hepatitis B virus X protein (HBx) that activates cellular promoters in host cells to facilitate viral replication. RESULTS: We constructed a new GFP-based reporter system which was different from a luciferase-based reporter system. Firstly, a FLAG-tagged HBx gene was inserted into an expression plasmid, resulting in plasmid pHBx...
April 6, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28378070/enhancing-substrate-utilization-and-power-production-of-a-microbial-fuel-cell-with-nitrogen-doped-carbon-aerogel-as-cathode-catalyst
#5
Gábor Márk Tardy, Bálint Lóránt, Máté Lóka, Balázs Nagy, Krisztina László
OBJECTIVES: Catalytic efficiency of a nitrogen-doped, mesoporous carbon aerogel cathode catalyst was investigated in a two-chambered microbial fuel cell (MFC) applying graphite felt as base material for cathode and anode, utilizing peptone as carbon source. RESULTS: This mesoporous carbon aerogel containing catalyst layer on the cathode increased the maximum power density normalized to the anode volume to 2.7 times higher compared to the maximum power density obtained applying graphite felt cathode without the catalyst layer...
April 4, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28374071/biosynthesis-of-di-rhamnolipids-and-variations-of-congeners-composition-in-genetically-engineered-escherichia-coli
#6
Jin Du, Aijun Zhang, Jian'an Hao, Jing Wang
OBJECTIVES: To engineer Escherichia coli for the heterologous production of di-rhamnolipids, which are important biosurfactants but mainly produced by opportunistic pathogen Pseudomonas aeruginosa. RESULTS: The codon-optimized rhlAB and rhlC genes originating from P. aeruginosa and Burkholderia pseudomallei were combinatorially expressed in E. coli to produce di-rhamnolipids with varied congeners compositions. Genes involved in endogenous upstream pathways (rhamnose and fatty acids synthesis) were co-overexpressed with rhlAB-rhlC, resulting in variations of rhamnolipids production and congeners compositions...
April 3, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28374070/knockdown-of-microrna-17-5p-ameliorates-atherosclerotic-lesions-in-apoe-mice-and-restores-the-expression-of-very-low-density-lipoprotein-receptor
#7
Lili Tan, Liang Meng, Xiaojing Shi, Bo Yu
OBJECTIVE: To propose and verify a hypothesis that miR-17-5p knockdown may mitigate atherosclerotic lesions using atherosclerotic ApoE(-/-) mice as serum microRNA-17-5p (miR-17-5p) is elevated in patients with atherosclerosis. RESULTS: The level of miR-17-5p was higher while the level of very low density lipoprotein receptor (VLDLR), a predicted target of miR-17-5p, was lower in the peripheral blood lymphocytes (PBLs) of atherosclerosis patients as compared with control PBLs...
April 3, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28365881/a-comparison-between-constitutive-and-inducible-transgenic-expression-of-the-phrip-i-gene-for-broad-spectrum-resistance-against-phytopathogens-in-potato
#8
Romel Gonzales-Salazar, Bianca Cecere, Michelina Ruocco, Rosa Rao, Giandomenico Corrado
OBJECTIVES: To engineer broad spectrum resistance in potato using different expression strategies. RESULTS: The previously identified Ribosome-Inactivating Protein from Phytolacca heterotepala was expressed in potato under a constitutive or a wound-inducible promoter. Leaves and tubers of the plants constitutively expressing the transgene were resistant to Botrytis cinerea and Rhizoctonia solani, respectively. The wound-inducible promoter was useful in driving the expression upon wounding and fungal damage, and conferred resistance to B...
April 1, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28357621/improved-campesterol-production-in-engineered-yarrowia-lipolytica-strains
#9
Yu Zhang, Ying Wang, Mingdong Yao, Hong Liu, Xiao Zhou, Wenhai Xiao, Yingjin Yuan
OBJECTIVES: To engineer Yarrowia lipolytica for improving the heterologous production of campesterol (a key precursor to manufacture pharmaceutical steroids). RESULTS: By screening 7-dehydrocholesterol reductase (DHCR7) from diverse species, DHCR7 from Danio rerio was the best candidate for campesterol synthesis. Overexpression of ACL (ATP: citrate lyase) or POX2 (peroxisome acyl-CoA oxidase 2) were key to improving campesterol production. The highest yield of campesterol was 942 mg/l was with the strain overexpressing POX2 in a 5 l bioreactor via high cell density fermentation process with a restricted supply of carbon sourc, sunflower seed oil...
March 29, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28353148/molecular-and-biochemical-characterization-of-squalene-synthase-from-siraitia-grosvenorii
#10
Heling Su, Yongming Liu, Yalun Xiao, Yanlian Tan, Yunyan Gu, Bin Liang, Hongli Huang, Yaosheng Wu
OBJECTIVES: To clone and characterize the squalene synthase from Siraitia grosvenorii (SgSQS). RESULTS: The gene encoding SgSQS was cloned. SgSQS has 417 amino acid residues with an pI of 7.3. There are 32 phosphorylation sites in its sequence: S(48) as well as S(196) play important roles in regulation of enzyme activity. The enzyme is a monomeric protein with a cave-like active center formed by α helixes and has two transmembrane domains at its C-terminus. SgSQS mRNA expression in stem and root were about twice as much as that in leaf and peel...
March 28, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28353147/bioconversion-of-lutein-by-enterobacter-hormaechei-to-form-a-new-compound-8-methyl-%C3%AE-ionone
#11
Guifang Zhong, Fangfang Wang, Jianhong Sun, Jianbin Ye, Duobin Mao, Ke Ma, Xuepeng Yang
OBJECTIVES: To investigate the final product of the bioconversion of lutein by a novel lutein-degrading bacterium, Enterobacter hormaechei A20, and the kinetics of the process. RESULTS: A new product, 8-methyl-α-ionone, was resolved by GC-MS. The compound was further identified by NMR. A conversion yield of 90% was achieved by E. hormaechei in 36 h with 10 g lutein l(-1). CONCLUSIONS: This is the first report of the bioconversion of lutein to form 8-methyl-α-ionone...
March 28, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28353146/the-lacrimal-gland-development-wound-repair-and-regeneration
#12
REVIEW
Yupeng Yao, Yan Zhang
The lacrimal gland (LG) is important as it has a significant role in maintaining the stability of the microenvironment of the ocular surface. When a loss of function occurs in the LG, a significant reduction in tear production and dry eye disease (DED) may occur. A mammalian LG is a secretory gland consisting of acini and ducts. The interaction between epithelial cells and mesenchymal cells plays a major role during development and the self-restoration process of the gland. Some factors, such as fibroblast growth factor 10 and bone morphogenetic protein 7, are associated with these processes...
March 28, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28353145/mapk-erk-signalling-is-required-for-zebrafish-cardiac-regeneration
#13
Peiyun Liu, Tao P Zhong
OBJECTIVES: To better understand the molecular mechanisms of regeneration and explore the potential signalling pathways as therapeutic targets for heart attacks. RESULTS: After treatment with the MEK inhibitor AZD6244 upon cardiac injury, the core members in MAPK/ERK signalling-mek and erk-demonstrate elevated expression, and these proteins are deposited at the injury site in zebrafish. pERK is also induced in non-cardiomyocytes near the injury site. Furthermore, the induced expression of a dominant-negative form of MEK1 inhibits zebrafish cardiac regeneration, characterized by increased cardiac fibrosis (a hallmark of regenerative failure), reduced or delayed production of regenerative myocardium, and migration of FLI1(+) endothelial cells, without direct inhibition of cardiomyocyte proliferation...
March 28, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28337557/mir-9-enhances-the-sensitivity-of-a549-cells-to-cisplatin-by-inhibiting-autophagy
#14
Yan Zhang, Xia Meng, Cheng Li, Zhoulin Tan, Xinwei Guo, Zhiting Zhang, Tao Xi
OBJECTIVES: To demonstrate that miR-9 inhibits autophagy by down-regulating Beclin1 and thus enhances the sensitivity of A549 cells to cisplatin. RESULTS: MiR-9 inhibited Beclin1 expression by binding to its 3'UTR. The inhibition decreased the cisplatin-induced autophagy in A549 cells, evidenced by the decreased expression of LC3II and GFP-LC3 puncta and the increased expression of P62. Upregulation of miR-9 level enhanced the sensibility of A549 cells to cisplatin and increased the cisplatin-induced apoptosis...
March 23, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28337556/homologous-gene-targeting-of-a-carotenoids-biosynthetic-gene-in-rhodosporidium-toruloides-by-agrobacterium-mediated-transformation
#15
Wenyi Sun, Xiaobing Yang, Xueying Wang, Xinping Lin, Yanan Wang, Sufang Zhang, Yushi Luan, Zongbao K Zhao
OBJECTIVES: To target a carotenoid biosynthetic gene in the oleaginous yeast Rhodosporidium toruloides by using the Agrobacterium-mediated transformation (AMT) method. RESULTS: The RHTO_04602 locus of R. toruloides NP11, previously assigned to code the carotenoid biosynthetic gene CRTI, was amplified from genomic DNA and cloned into the binary plasmid pZPK-mcs, resulting in pZPK-CRT. A HYG-expression cassette was inserted into the CRTI sequence of pZPK-CRT by utilizing the restriction-free clone strategy...
March 23, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28337555/erratum-to-construction-of-a-thermo-sensitive-pri857-vector-for-efficient-dna-capturing-in-escherichia-coli
#16
Yang Wang, Kai Zhang, Huijuan Su, Muhan Yang, Jing Ge, Guiyao Li, Jun Yi
No abstract text is available yet for this article.
March 23, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28315059/cdk-inhibitor-su9516-induces-tetraploid-blastocyst-formation-from-parthenogenetically-activated-porcine-embryos
#17
Qing Guo, Long Jin, Hai-Ying Zhu, Xiao-Chen Li, Yu-Chen Zhang, Xiao-Xu Xing, Guang-Lei Zhang, Mei-Fu Xuan, Qi-Rong Luo, Zhao-Bo Luo, Jun-Xia Wang, Jin-Dan Kang, Xi-Jun Yin
OBJECTIVE: To examine the effect of SU9516, a cyclin-dependent kinase inhibitor, on the induction of tetraploid blastocyst formation in porcine embryos by parthenogenetic activation. RESULTS: Karyotype analysis of blastocysts showed that in the SU9516-treatment group 56% were tetraploid, whereas in the cytochalasin B (CB) group 67% were diploid. The level of maturation-promoting factor (MPF) in stimulated embryos treated with 10 µM SU9516 for 4 h was lower than in embryos treated with CB group (103 vs...
March 17, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28315058/improving-egsb-reactor-performance-for-simultaneous-bioenergy-and-organic-acid-production-from-cheese-whey-via-continuous-biological-h2-production
#18
Lucas Rodrigues Ramos, Edson Luiz Silva
OBJECTIVES: To evaluate the influence of hydraulic retention time (HRT) and cheese whey (CW) substrate concentration (15 and 25 g lactose l(-1)) on the performance of EGSB reactors (R15 and R25, respectively) for H2 production. RESULTS: A decrease in the HRT from 8 to 4 h favored the H2 yield and H2 production rate (HPR) in R15, with maximum values of 0.86 ± 0.11 mmol H2 g COD(-1) and 0.23 ± 0.024 l H2 h(-1) l(-1), respectively. H2 production in R25 was also favored at a HRT of 4 h, with maximum yield and HPR values of 0...
March 17, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28299546/combinatorial-analysis-of-enzymatic-bottlenecks-of-l-tyrosine-pathway-by-p-coumaric-acid-production-in-saccharomyces-cerevisiae
#19
Jiwei Mao, Quanli Liu, Xiaofei Song, Hesuiyuan Wang, Hui Feng, Haijin Xu, Mingqiang Qiao
OBJECTIVE: To identify new enzymatic bottlenecks of L-tyrosine pathway for further improving the production of L-tyrosine and its derivatives. RESULT: When ARO4 and ARO7 were deregulated by their feedback resistant derivatives in the host strains, the ARO2 and TYR1 genes, coding for chorismate synthase and prephenate dehydrogenase were further identified as new important rate-limiting steps. The yield of p-coumaric acid in the feedback-resistant strain overexpressing ARO2 or TYR1, was significantly increased from 6...
March 15, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28299545/desulfurization-with-thialkalivibrio-versutus-immobilized-on-magnetic-nanoparticles-modified-with-3-aminopropyltriethoxysilane
#20
Tingzhen Mu, Jixiang Zhao, Yueping Guan, Jiangnan Tian, Maohua Yang, Chen Guo, Jianmin Xing
OBJECTIVE: Thialkalivibrio versutus D301 cells were immobilized on Fe3O4 nanoparticles (NPs) synthesized by an improved chemical coprecipitation method and modified with 3-aminopropyltriethoxysilane (APTES), then the immobilized cells were used in sulfur oxidation. RESULTS: The prepared Fe3O4-APTES NPs had a narrow size distribution (10 ± 2 nm) and were superparamagnetic, with a saturation magnetization of 60.69 emu/g. Immobilized cells had a saturation magnetization of 34...
March 15, 2017: Biotechnology Letters
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