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Notch ligand Jagged1 promotes mesenchymal stromal cell-based cartilage repair
Junkui Sun,Zhengliang Luo,Guangxi Wang,Yuping Wang,Yisheng Wang,Margaret Olmedo,Massimo Max Morandi,Shane Barton,Christopher G. Kevil,Bing Shu,Xifu Shang,Yufeng Dong 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-
Placenta-derived mesenchymal stromal cells (PMSCs) provide a promising cell source for tissue regeneration. However, rapid induction of PMSC chondrogenic differentiation during therapeutic transplantation remains extremely challenging. Here we undertook a study to determine if Notch inhibition by soluble Jagged1 (JAG1) peptides could be utilized to accelerate PMSC-induced cartilage regeneration in a mouse post-traumatic osteoarthritis (PTOA) model. Our results showed that treatment of PMSCs with soluble JAG1 significantly enhanced chondrogenesis in culture as shown by increased alcian blue staining and decreased Notch target Hes1 expression when compared to those in lgG-treated control cells. Importantly, significantly enhanced cartilage formation and decreased joint inflammation were observed when JAG1-treated PMSCs were injected into mouse PTOA knee joints. Finally, in vivo cell tracing showed that more JAG1-treated PMSCs remained in knee joint tissues and that JAG1-treated PMSCs exhibited greater PMSC chondrogenic differentiation than lgG-treated control PMSCs at 4 weeks after injection. These data indicate that transient Notch inhibition by soluble JAG1 could be used to enhance PMSC survival and chondrogenic differentiation, thereby increasing the therapeutic potential of PMSCs for cartilage regeneration.
An iteration schemes for nonexpansive mappings and variational inequalities
Hongjun Wang,Yisheng Song 대한수학회 2011 대한수학회보 Vol.48 No.5
An iterative algorithm is provided to find a common element of the set of fixed points of a nonexpansive mapping and the set of solutions of some variational inequality in a Hilbert space. Using this result, we consider a strong convergence result for finding a common fixed point of a nonexpansive mapping and a strictly pseudocontractive mapping. Our results include the previous results as special cases and can be viewed as an improvement and refinement of the previously known results.
Synthesis of light olefins from syngas over Fe–Mn–V–K catalysts in the slurry phase
Gencun Wang,Yisheng Tan,Kan Zhang,Ping Liu,Haitao Hui 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
Fe–Mn–V–K catalysts for the synthesis of light olefins from CO hydrogenation were prepared by a specially controlled degradation method. The effect of the V content on the structure and the catalytic performance of the catalysts were investigated in a continuously stirred tank slurry reactor. Mo¨ssbauer spectra (MES) results show that the incorporation of V with appropriate contents can improve the dispersion of the a-Fe2O3 phase. CO hydrogenation results indicate that a small addition of V can improve the product distribution. The addition can also increase the selectivity to light olefins by inhibiting the secondary hydrogenation reaction of the initial olefin. The best catalytic performance was obtained at the Fe/Mn/V molar ratio of 3/1/0.2. The total C2–C4 content in all hydrocarbons and O/P in the C2–C4 fraction were 49.15 wt% and 3.95, respectively.
Zhenmin Liu,Junwei Wang,Mao-qing Kang,Ning Yin,Xin-kui Wang,Yisheng Tan,Yulei Zhu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
MgAl hydrotalcite synthesized via co-precipitation method from magnesium and aluminum nitrateswas calcined to produce Mg4AlO5.5 mixed oxides. The oxides were modified by introducing LiNO3 andapplied to the synthesis of glycerol carbonate from glycerol and dimethyl carbonate. The research resultsindicated that LiNO3/Mg4AlO5.5 was an efficient catalyst for the synthesis of glycerol carbonate. The fullconversion of glycerol and 96.28% yield of glycerol carbonate were obtained after reacting at 80 8C for1.5 h in the presence of LiNO3/Mg4AlO5.5. The structure and properties of the catalysts were studied bymeans of XRD, TGA, BET, CO2-TPD and Hammett indicator method. It was found that the basic strengthand the basicity of the catalysts were enhanced after addition of LiNO3. Over Mg4AlO5.5 oxides, LiNO3 waseasily converted to LiAlO2 which constituted new strong basic sites. Too high basic strength and basicityof catalysts may improve the conversion of glycerol at the cost of GC selectivity reduction.
( Yanling Quan ),( Lin Wang ),( Yisheng Liu ),( Jingxiang Cong ),( Shengquan Xie ),( Xiuhong Wu ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.3
Plackett-Burman (PB) and Box-Behnken (BB) experimental designs were used to optimize fermentation variables for the biotransformation of glycyrrhizin (GL) to monoglucuronyl-glycyrrhetinic acid (MGGA). The PB design was first used to screen the important factors among the medium variables. The steepest ascent method was used to approach the optimum range for each of these factors. The BB design was finally used to analyze the response surfaces of the screened factors for further optimization. The optimized conditions for this system were 0.7 g/L MgSO4·7H2O, 1.19 g/L GL, and cultivation for six days. The biotransformation of GL to MGGA could reach up to 35.72%, which is a good result for this kind of transformation.
Effect of Tensile Deformation of Austenite on the Morphology and Strength of Lath Martensite
Zengmin Shi,Kai liu,Maoqiu Wang,Jie Shi,Han Dong,Jian Pu,Bo Chi,Yisheng Zhang,Li Jian 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2
A hot-rolled steel, 22SiMn2TiB, was employed to study the effect of austenite deformation on the micro-structure and strength of the subsequently formed lath martensite. It was revealed that the sizes of the mar-tensite packet, block and lath were refined by the tensile deformation of austenite at temperatures above 850 °C. With the increase of the deformation temperature, the packet size increased, whereas the block size decreased. The width of the lath was independent of the prior austenite grain size and the deformation temperature. The refinement of martensite blocks was considered to strengthen the ausformed martensite.