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Search Results: 1 - 10 of 14709 matches for " MingJuan Tang "
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Screening for differentially expressed genes in Anoectochilus roxburghii (Orchidaceae) during symbiosis with the mycorrhizal fungus Epulorhiza sp.
Biao Li,MingJuan Tang,Kun Tang,LiFang Zhao,ShunXing Guo
Science China Life Sciences , 2012, DOI: 10.1007/s11427-012-4284-0
Abstract: Mycorrhizal fungi promote the growth and development of plants, including medicinal plants. The mechanisms by which this growth promotion occurs are of theoretical interest and practical importance to agriculture. Here, an endophytic fungus (AR-18) was isolated from roots of the orchid Anoectochilus roxburghii growing in the wild, and identified as Epulorhiza sp. Tissue-cultured seedlings of A. roxburghii were inoculated with AR-18 and co-cultured for 60 d. Endotrophic mycorrhiza formed and the growth of A. roxburghii was markedly promoted by the fungus. To identify genes in A. roxburghii that were differentially expressed during the symbiosis with AR-18, we used the differential display reverse transcription polymerase chain reaction (DDRT-PCR) method to compare the transcriptomes between seedlings inoculated with the fungus and control seedlings. We amplified 52 DDRT-PCR bands using 15 primer combinations of three anchor primers and five arbitrary primers, and nine bands were re-amplified by double primers. Reverse Northern blot analyses were used to further screen the bands. Five clones were up-regulated in the symbiotic interaction, including genes encoding a uracil phosphoribosyltransferase (UPRTs; EC and a hypothetical protein. One gene encoding an amino acid transmembrane transporter was down-regulated, and one gene encoding a tRNA-Lys (trnK) and a maturase K (matK) pseudogene were expressed only in the inoculated seedlings. The possible roles of the above genes, especially the UPRTs and matK genes, are discussed in relation to the fungal interaction. This study is the first of its type in A. roxburghii.
Allergenicity assay of allergen fromDermatophagoides farinae in transgenic tobacco
Mingjuan Tang,Ye Shen,Yuanlei Hu,Lei Cao,Ting Ni,Hongyu Zhang,Zhongping Lin
Chinese Science Bulletin , 2004, DOI: 10.1007/BF02900963
Abstract: Derf 2 gene for one of mite allergens inDermatophagoides farinae has been cloned and expressed under regulation of 35S promoter in transgenic tobacco. The transcriptional analysis showed that this mite complete gene structure in genomic sequence could be spliced at prediction site. Allergenicity assay with immunological sera indicated that the extracts from the transgenic tobacco gave obvious positive IgE binding reaction with specific serum pool. This work would be of potential use in allergenicity assessment of genetically modified food.
Cultural Identity in China English as a Variety of English
Mingjuan Zhang
Asian Social Science , 2009, DOI: 10.5539/ass.v4n9p99
Abstract: The status of English as an International language breaks the situation in which British English or American English is the sole standard. English becomes World Englishes, taking on a plural form, which include many varieties of English with nativized cultural, political and economical characteristics. Researchers in China believe that China English as a variety of English has been objectively in existence. It refers to English used by the speakers with Chinese linguistic and cultural background who consciously or unconsciously transfer the Chinese cultural identities into English, thus endowing China English with distinctive cultural identities. China English consolidates the cultural identity of the Chinese speakers of English, enriches the multiple identities of English and plays an important role in promoting Chinese culture internationally.
China English and ELT for English Majors
Mingjuan Zhang
English Language Teaching , 2008, DOI: 10.5539/elt.v1n2p143
Abstract: This paper is a general study of one of varieties of English—China English and its influence on English Language Teaching (ELT) for English majors. The status of English as an International language breaks the situation in which British English or American English is the sole standard. English becomes World Englishes, taking on a plural form, which include many varieties of English with nativized cultural, political and economical characteristics. Researchers in China believe that China English as a variety of English has been objectively in existence and become a lingua franca. It consolidates the cultural identity of the Chinese speakers of English, enriches the multiple identities of English and plays an important role in promoting Chinese culture internationally. For teachers of English majors, it presents challenges to their traditional view of language teaching.
MicroRNA–Mediated Repression of the Seed Maturation Program during Vegetative Development in Arabidopsis
Xurong Tang equal contributor,Shaomin Bian equal contributor,Mingjuan Tang equal contributor,Qing Lu,Shengben Li,Xigang Liu,Gang Tian,Vi Nguyen,Edward W. T. Tsang,Aiming Wang,Steven J. Rothstein,Xuemei Chen ,Yuhai Cui
PLOS Genetics , 2012, DOI: 10.1371/journal.pgen.1003091
Abstract: The seed maturation program only occurs during late embryogenesis, and repression of the program is pivotal for seedling development. However, the mechanism through which this repression is achieved in vegetative tissues is poorly understood. Here we report a microRNA (miRNA)–mediated repression mechanism operating in leaves. To understand the repression of the embryonic program in seedlings, we have conducted a genetic screen using a seed maturation gene reporter transgenic line in Arabidopsis (Arabidopsis thaliana) for the isolation of mutants that ectopically express seed maturation genes in leaves. One of the mutants identified from the screen is a weak allele of ARGONAUTE1 (AGO1) that encodes an effector protein for small RNAs. We first show that it is the defect in the accumulation of miRNAs rather than other small RNAs that causes the ectopic seed gene expression in ago1. We then demonstrate that overexpression of miR166 suppresses the derepression of the seed gene reporter in ago1 and that, conversely, the specific loss of miR166 causes ectopic expression of seed maturation genes. Further, we show that ectopic expression of miR166 targets, type III homeodomain-leucine zipper (HD-ZIPIII) genes PHABULOSA (PHB) and PHAVOLUTA (PHV), is sufficient to activate seed maturation genes in vegetative tissues. Lastly, we show that PHB binds the promoter of LEAFY COTYLEDON2 (LEC2), which encodes a master regulator of seed maturation. Therefore, this study establishes a core module composed of a miRNA, its target genes (PHB and PHV), and the direct target of PHB (LEC2) as an underlying mechanism that keeps the seed maturation program off during vegetative development.
A Genetic Variant in miR-196a2 Increased Digestive System Cancer Risks: A Meta-Analysis of 15 Case-Control Studies
Jing Guo, Mingjuan Jin, Mingwu Zhang, Kun Chen
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0030585
Abstract: Background MicroRNAs (miRNAs) negatively regulate the gene expression and act as tumor suppressors or oncogenes in oncogenesis. The association between single nucleotide polymorphism (SNP) in miR-196a2 rs11614913 and the susceptibility of digestive system cancers was inconsistent in previous studies. Methodology/Principal Findings An updated meta-analysis based on 15 independent case-control studies consisting of 4999 cancer patients and 7606 controls was performed to address this association. It was found that miR-196a2 polymorphism significantly elevated the risks of digestive system cancers (CT vs. TT, OR = 1.25, 95% CI = 1.07–1.45; CC vs. TT, OR = 1.38, 95% CI = 1.13–1.67; CC/CT vs. TT, OR = 1.29, 95% CI = 1.10–1.50; CC vs. CT/TT, OR = 1.14, 95% CI = 1.01–1.30; C vs. T, OR = 1.15, 95% CI = 1.05–1.26). We also found that variant in miR-196a2 increased the susceptibility of colorectal cancer (CRC) (CT vs. TT, OR = 1.23, 95% CI = 1.04–1.44; CC vs. TT, OR = 1.32, 95% CI = 1.08–1.61; CC/CT vs. TT, OR = 1.25, 95% CI = 1.07–1.46; C vs. T, OR = 1.15, 95% CI = 1.05–1.28), while the association in recessive model (CC vs. CT/TT, OR = 1.16, 95% CI = 0.98–1.38) showed a marginal significance. Additionally, significant association between miR-196a2 polymorphism and increased risk of hepatocellular cancer (HCC) was detected. By stratifying tumors on the basis of site of origin, source of controls, ethnicity and allele frequency in controls, elevated cancer risks were observed. Conclusion/Significance Our findings suggest the significant association between miR-196a2 polymorphism and increased susceptibility of digestive system cancers, especially of CRC, HCC and Asians. Besides, C allele may contribute to increased digestive cancer risks.
Xiaoju Liu,Bingqin Yang,Mingjuan Wang,Maxim V. Borzov
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810028035
Abstract: In the title compound, C18H22N2O3, the dihedral angle between the aromatic rings is 3.9 (2)°. Both H atoms of the hydroxy groups are involved in intermolecular O—H...O hydrogen bonding. In the crystal structure, this hydrogen bonding assembles molecules into chains of 21 symmetry extending parallel to the b axis. The almost planar (within 0.09 and 0.06 ) 4-CH3O–C6H4–CH=N–C6H4– groups are oriented outwards the twofold screw axis.
Influence of ischemia before vein grafting on early hyperplasia of the graft and the dynamic changes of the intima after grafting
Zou RongJiang,Sun MingJuan,Lu ZhiQian,Guo QingKui
Journal of Cardiothoracic Surgery , 2012, DOI: 10.1186/1749-8090-7-90
Abstract: Background To investigate both the influence of ischemia before grafting on early hyperplasia of the vein grafts, and the dynamic changes of the intima after grafting in a rabbit model of vein graft disease. Methods We performed paired vein graft experiments under different ischemic conditions (15 vs. 60 min; 15 vs. 90 min) in the neck of the rabbits and compared the differences between the grafts. Clopidogrel, an anti-platelet agent, was administered before and after surgery. Twenty-eight days after the grafting procedure, the veins were evaluated microscopically. The dynamic changes of the intima after grafting were evaluated by scanning electron microscopy over time. Results The vein grafts subjected to 60- or 90-min ischemia exhibited no differences compared to those subjected to 15-min ischemia in terms of the mean thickness of the intimal, medial, and adventitial layers of the graft. Similarly, there was no difference in the Ki-67 labeling index (proliferation marker) between the vein grafts. Vein grafts with 15-min ischemia lost endothelial cells (ECs) but healed by 3 days post graft, whereas vein grafts with 90-min ischemia suffered serious EC loss, which was restored with new ECs during days 2 to 14 post graft. Conclusions Ninety-minute ischemia before vein grafting can cause serious EC loss, but does not increase early intimal hyperplasia when clopidogrel is administered. Protecting the vein from ischemia and reperfusion injury preserves ECs.
Twist and miR-34a Are Involved in the Generation of Tumor-Educated Myeloid-Derived Suppressor Cells
Xin Wang,Xusheng Chang,Guangzuan Zhuo,Mingjuan Sun,Kai Yin
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms141020459
Abstract: Tumors can induce the generation and accumulation of immunosuppressive cells such as myeloid-derived suppressor cells in the tumor microenvironment, contributing to tumor immunological escapes. Many studies have demonstrated that multiple factors could induce myeloid precursor cells into myeloid-derived suppressor cells, not dendritic cells. In our study, we found that tumor supernatants could induce the generation of myeloid-derived suppressor cells by disturbing the development of dendritic cells. Twist and miR-34a may regulate the effect of tumor cells inducing myeloid-derived suppressor cells via TGF-β and/or IL-10.
A Computational Study on Thiourea Analogs as Potent MK-2 Inhibitors
Ming Hao,Hong Ren,Fang Luo,Shuwei Zhang,Jieshan Qiu,Mingjuan Ji,Hongzong Si,Guohui Li
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13067057
Abstract: Mitogen-activated protein kinase-activated protein kinase 2 (MK-2) has been identified as a drug target for the treatment of inflammatory diseases. Currently, a series of thiourea analogs as potent MK-2 inhibitors were studied using comprehensive computational methods by 3D-QSAR, molecular docking and molecular dynamics simulations for a further improvement in activities. The optimal 3D models exhibit high statistical significance of the results, especially for the CoMFA results with r 2 ncv, q 2 values of 0.974, 0.536 for the internal validation, and r 2 pred, r 2 m values of 0.910, 0.723 for the external validation and Roy’s index, respectively. In addition, more rigorous validation criteria suggested by Tropsha were also employed to check the built models. Graphic representation of the results, as contoured 3D coefficient plots, also provides a clue to the reasonable modification of molecules: (i) The substituent with a bulky size and electron-rich group at the C5 position of the pyrazine ring is required to enhance the potency; (ii) The H-bond acceptor group in the C3 position of the pyrazine ring is likely to be helpful to increase MK-2 inhibition; (iii) The small and electropositive substituent as a hydrogen bond donor of the C2 position in the oxazolone ring is favored; In addition, several important amino acid residues were also identified as playing an important role in MK-2 inhibition. The agreement between 3D-QSAR, molecular docking and molecular dynamics simulations also proves the rationality of the developed models. These results, we hope, may be helpful in designing novel and potential MK-2 inhibitors.
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