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MicroRNA-206 Reduces Osteosarcoma Cell Malignancy In Vitro by Targeting the PAX3-MET Axis
Qian-Rong Deng,Fang-Biao Zhan,Xian-Wei Zhang,Shi-Long Feng,Jun Cheng,You Zhang,Bo Li,Li-Zhong Xie 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.2
Purpose: This study was undertaken to explore how miR-206 represses osteosarcoma (OS) development. Materials and Methods: Expression levels of miR-206, PAX3, and MET mRNA were explored in paired OS and adjacent tissuespecimens. A patient-derived OS cell line was established. miR-206 overexpression and knockdown were achieved by lentiviraltransduction. PAX3 and MET overexpression were achieved by plasmid transfection. Treatment with hepatocyte growth factor(HGF) was utilized to activate c-Met receptor. Associations between miR-206 and PAX3 or MET mRNA in OS cells were verifiedby AGO2-RNA immunoprecipitation assay and miRNA pulldown assay. OS cell malignancy was evaluated in vitro by cell proliferation,metastasis, and apoptosis assays. PAX3 and MET gene expression in OS cells was assayed by RT-qPCR and Western blot. Activation of PI3K-AKT and MAPK-ERK in OS cells were assayed by evaluating Akt1 Ser473 phosphorylation and total threoninephosphorylation of Erk1/2, respectively. Results: Expression levels of miR-206 were significantly decreased in OS tissue specimens, compared to adjacent counterparts,and were inversely correlated with expression of PAX3 and MET mRNA. miR-206 directly interacted with PAX3 and MET mRNAin OS cells. miR-206 overexpression significantly reduced PAX3 and MET gene expression in OS cells in vitro, resulting in significantdecreases in Akt1 and Erk1/2 activation, cell proliferation, and metastasis, as well as increases in cell apoptosis, while miR-206 knockdown showed the opposite effects. The effects of miR-206 overexpression on OS cells were reversed by PAX3 or METoverexpression, but only partially attenuated by HGF treatment. Conclusion: miR-206 reduces OS cell malignancy in vitro by targeting PAX3 and MET gene expression.
DIFFRACTION OF MAGNETOELASTIC WAVES BY PIEZOELECTRIC NANOFIBER EMBEDDED IN PIEZOMAGNETIC MATRIX
RONG ZHANG,XUE-QIAN FANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.3
We present an analytical method for the scattering of antiplane shear waves by a piezoelectric nano¯ber surrounded by piezomagnetic matrix. Owing to their analogies, the piezoelectric surface/interface theory is extended to the magneto-electro-elastic surface/interface theory. The analytical solutions of elastic ¯eld, electric ¯eld and magnetic ¯eld are expressed by employing wave function expansion method and then the expanded mode coe±cients are determined by satisfying the nanoboundary conditions around the ¯ber (a piezoelectric nanowire). The e®ects of the incident frequency are graphically illustrated and discussed. The material properties of the nanointerface, which is related to the two phases, are examined through parametric variation. A comparison with a non-nano case is also presented.
Qian Chen,Jun Song,Wen‑Ping Du,Li‑Yuan Xu,Yun Jiang,Jie Zhang,Xiao‑Li Xiang,Gui‑Rong Yu 한국유전학회 2018 Genes & Genomics Vol.40 No.10
Semi-dwarfism is an agronomically important trait in breeding for stable high yields and for resistance to damage by wind and rain (lodging resistance). Many QTLs and genes causing dwarf phenotype have been found in maize. However, because of the yield loss associated with these QTLs and genes, they have been difficult to use in breeding for dwarf stature in maize. Therefore, it is important to find the new dwarfing genes or materials without undesirable characters. The objectives of this study were: (1) to figure out the inheritance of semi-dwarfism in mutants; (2) mapping dwarfing gene or QTL. Maize inbred lines ‘18599’ and ‘DM173’, which is the dwarf mutant derived from the maize inbred line ‘173’ through 60Co-γ ray irradiation. F2 and BC1F1 population were used for genetic analysis. Whole genome resequencing-based technology (QTL-seq) were performed to map dwarfing gene and figured out the SNP markers in predicted region using dwarf bulk and tall bulk from F2 population. Based on the polymorphic SNP markers from QTL-seq, we were fine-mapping the dwarfing gene using F2 population. In F2 population, 398 were dwarf plants and 135 were tall plants. Results of χ2 tests indicated that the ratio of dwarf plants to tall plants was fitted to 3:1 ratio. Furthermore, the χ2 tests of BC1F1 population showed that the ratio was fitted to 1:1 ratio. Based on QTL-seq, the dwarfing gene was located at the region from 111.07 to 124.56 Mb of chromosome 9, and we named it rht-DM. Using traditional QTL mapping with SNP markers, the rht-DM was narrowed down to 400 kb region between SNP-21 and SNP-24. The two SNPs were located at 0.43 and 0.11 cM. Segregation analysis of F2 and BC1F1 indicated that the dwarfing gene was likely a dominant gene. This dwarfing gene was located in the region between 115.02 and 115.42 Mb on chromosome 9.
Effects of Temperature, Illumination, and Sodium Ascorbate on Browning of Green Tea Infusion
Qian Ye,Hao Chen,Lin Bin Zhang,Jian Hui Ye,Jian Liang Lu,Yue Rong Liang 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.4
Browning of tea infusion is an obstructive factor influencing shelf life of ready-to-drink green tea. Effects of temperature and illumination on the browning of green tea infusion were investigated. It was shown that both elevated temperature and illumination led to the browning of green tea infusion, but temperature had greater effect on infusion color and level of catechins than illumination. The levels of unoxidized catechins such as (-)-epigallocatechin gallate (EGCg), (-)-epigallocatechin (EGC), (-)-epicatechin gallate (ECg), (-)-epicatechin (EC), and total catechins remaining in the tea infusion were significantly correlated to color parameters of the tea infusion. Sodium ascorbate inhibited the infusion browning by suppressing the oxidation of tea catechins and it is considered to be a more suitable preservative for prolonging shelf life of ready-to-drink green tea than ascorbic acid because it has less effect on tea taste. The effects of temperature and illumination on the epimerization of catechins were also discussed.
Single-index composite quantile regression
Rong Jiang,Zhan-Gong Zhou,Wei-Min Qian,Wen-Qiong Shao 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.3
In this paper, we extend the composite quantile regression (CQR) method to a single-index model. The unknown link function is estimated by local composite quantile regression and the parametric index is estimated through the linear composite quantile. It is shown that the proposed estimators are consistent and asymptotically normal. The simulation studies and real data applications are conducted to illustrate the finite sample performance of the proposed methods.
Qian Zhang,Changpeng Hu,Jingbin Huang,Wuyi Liu,Wenjing Lai,Faning Leng,Qin Tang,Yali Liu,Qing Wang,Min Zhou,Fangfang Sheng,Guobing Li,Rong Zhang 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-
Dopamine deficiency is mainly caused by apoptosis of dopaminergic nerve cells in the substantia nigra of themidbrain and the striatum and is an important pathologic basis of Parkinson’s disease (PD). Recent research has shownthat dynamin-related protein 1 (Drp1)-mediated aberrant mitochondrial fission plays a crucial role in dopaminergicnerve cell apoptosis. However, the upstream regulatory mechanism remains unclear. Our study showed that Drp1knockdown inhibited aberrant mitochondrial fission and apoptosis. Importantly, we found that ROCK1 was activated inan MPP+-induced PD cell model and that ROCK1 knockdown and the specific ROCK1 activation inhibitor Y-27632blocked Drp1-mediated aberrant mitochondrial fission and apoptosis of dopaminergic nerve cells by suppressing Drp1dephosphorylation/activation. Our in vivo study confirmed that Y-27632 significantly improved symptoms in a PDmouse model by inhibiting Drp1-mediated aberrant mitochondrial fission and apoptosis. Collectively, our findingssuggest an important molecular mechanism of PD pathogenesis involving ROCK1-regulated dopaminergic nerve cellapoptosis via the activation of Drp1-induced aberrant mitochondrial fission.
Rong-Jun Zhang,Wei-Jie Lu,Qing-Yuan Cai,Wei-Xi Zhou,Yu-Xiang Zheng,Liang-Yao Chen,Hui Zhou,Shi-Xiong Qian,Se-Young Seo 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4
The nonlinear optical properties have been studied using the Z-scan technique for silicon nanocrystals embedded in a SiO2 matrix formed by high-temperature annealing of SiOx/SiO2 superlattices grown by thermal evaporation. A mode-locked Ti:sapphire laser system producing 140-fs-long pulses at 800 nm was used as the optical source for the Z-scan measurements. The nonlinear refractive index and the nonlinear absorption coefficient of the silicon nanocrystals were found to be 1.2 × 10−13 cm2/W and 1.5 × 10−9 cm/W, respectively, and to be strongly enhanced compared to those of bulk silicon. Such enhancement of the nonlinear optical properties is considered to be due to the quantum confinement effect of silicon nanocrystals.
Rong-ling Yang,Xi Chen,Yu-ye Song,Qian-lin Zhu,Muhammad Bilal,Yu Wang,Zheng Tong,Ting-ting Wu,Zhao-Yu Wang,Hong-zhen Luo,Xiang-jie Zhao,Ting-ting He 한국생물공학회 2022 Biotechnology and Bioprocess Engineering Vol.27 No.3
Tyrosinase inhibitors are clinically effective for treating some dermatological disorders related to melanin hyperpigmentation. Accordingly, the discovery and development of tyrosinase inhibitors have great value in the pharmaceutical and cosmetic industry. Here, a novel tyrosinase inhibitor, 6′-O-cinnamoyl-helicid (helicid cinnamylate) was successfully synthesized by a simple and effective biocatalytic approach with Aspergillus oryzae cells. Investigation of the effects of several key variables on helicid cinnamylate synthesis found that the reaction conversion, reaction rate and regioselectivity reached 99%, 9.40 mM/h and > 99%, respectively, at the optimal conditions with anhydrous acetone as the solvent, whole-cell concentration of 40 mg/mL, and the molar ratio of vinyl cinnamate to helicid of 10 at 45°C. The whole-cells retained 68.87% of its initial activity after reusing for seven batches, indicating a potent application potential in non-aqueous biocatalytic systems. It was worth noting that helicid cinnamylate demonstrated a more potent tyrosinase inhibitory activity with an IC50 value of 3.55 mM than helicid (IC50 = 4.48 mM) and arbutin (IC50 = 5.48 mM), which suggest that helicid cinnamylate could be developed as a more potential tyrosinase inhibitor. In conclusion, this study provides a novel whole-cell catalytic approach for the synthesis of helicid cinnamylate and insight into its application as a tyrosinase inhibitor.