Mechanism of epithelial-mesenchymal transition / 中国药理学通报

Epithelial-mesenchymal transition (EMT) is a process by which the epithelial cells change to a mesenchymal phenotype.The highly conserved and fundamental process is integral in development, wound healing and contributes pathologically to fibrosis and cancer progression.The process can be activated by many transcription factors, growth factors or protein molecules, which involves complex molecular mechanism and signal transduction pathways.This paper reviews the development of molecular mechanisms of epithelial-mesenchymal transition and briefly summarizes the research progress of natural compounds targeting the EMT.

Regulation of berberine and dioscin in expression of glucose metabolism molecular in trophoblast cells / 中华中医药杂志

Objective:To discuss the regulation of berberine and dioscin extracted from traditional Chinese medicine in the expression of protein moleculer related with glucose metabolism in trophoblast cells,such as IRS-1,P1-3K,Glut1,PPAR ?. Methods:To culture the chorion trophoblast cell in the early pregnancy,to induce cells to suffer glucose metabolism obstacle with the use of WortmaninnTake advantage of berberine and dioscin extracted from the Chinese traditional medicine with intervention,simultaneously set the troglitazone(T) and dimthyl(R) for the control group. Detect the gene expression with the use of RT-PCT,simutaniously detect the protein expression in molecular level. Examine the expression in the protein level with the technique of Western blot in combination with the technique of LSM for the expression location of protein moleculer related.Results:① With the induction of WT,the glucose metabolism inside the tropholast cells becomes abnormal,compared with normal(P

Comparison of 2 kinds of construction and expression methods of reconstructed human cathelicidin LL-37 / 第三军医大学学报

Objective To employ 2 approaches to construct and express reconstructed LL-37 (rLL-37) in procaryotic system, and to explore a better preparation method. Methods The first method: the rLL-37 was inserted into vector pET-28a (+), then was induced to express in E.coli. BL21 (DE3) and purified by chromatography; the second method: the rare codons in the rLL-37 gene sequence were substituted by the preferred codons of procaryotic cell, and a fragment of carrier protein molecule (CPM) was added to the N termination of the objective sequence to construct expression plasmid pET-30a(+)-CPM-rLL-37, then the rLL-37 was expressed in E.coli. BL21 Star(DE3) and purified by chromatography. The productive rates of the 2 methods were compared and the antimicrobial effects of obtained rLL-37 was studied. Results The first method: the DNA sequence of rLL-37 was obtained successively by Touch-Down PCR. The expression plasmid pET-30a(+)-CPM-rLL-37 was expressed with fusion protein in E.coli BL21 (DE3). The expression rate accounted for 20% of total bacterio-protein, then the expressed product was purified by using high positive ion exchange column Macro-Prep High S; The second method: a fragment of carrier protein molecule was designed that contained 28 amino-acid residue and its pHi was 2.7, net charge was-6.0 at pH 7.4. After the expression plasmid pET-30a(+)-CPM-rLL-37 was constructed successively, it was expressed in E.coli BL21 Star (DE3). The expressed fusion protein accounted for 35% of total bacterio-protein, then the expressed product was purified by using affinity binding chromatography with TALON resins successfully. The obtained 2 kinds of rLL-37 were able to kill both Gram-negative and-positive bacteria by the means of inhibitory zone. Conclusion It’s feasible to prepare efficiently rLL-37 in procaryotic system, which founds the basis for the further research on bactericidal activity of rLL-37.