Conservation of T cell epitopes between seasonal inlfuenza viruses and the novel inlfuenza A H7N9 virus / 中国病毒学·英文版

A novel avian influenza A (H7N9) virus recently emerged in the Yangtze River delta and caused diseases, often severe, in over 130 people. This H7N9 virus appeared to infect humans with greater ease than previous avian inlfuenza virus subtypes such as H5N1 and H9N2. While there are other potential explanations for this large number of human infections with an avian influenza virus, we investigated whether a lack of conserved T-cell epitopes between endemic H1N1 and H3N2 inlfuenza viruses and the novel H7N9 virus contributes to this observation. Here we demonstrate that a number of T cell epitopes are conserved between endemic H1N1 and H3N2 viruses and H7N9 virus. Most of these conserved epitopes are from viral internal proteins. The extent of conservation between endemic human seasonal inlfuenza and avian inlfuenza H7N9 was comparable to that with the highly pathogenic avian inlfuenza H5N1. Thus, the ease of inter-species transmission of H7N9 viruses (compared with avian H5N1 viruses) cannot be attributed to the lack of conservation of such T cell epitopes. On the contrary, our ifndings predict signiifcant T-cell based cross-reactions in the human population to the novel H7N9 virus. Our findings also have implications for H7N9 virus vaccine design.

Inhibitory effects of Ad-VEGI151 on venous endothelial cell proliferation / 第二军医大学学报

Objective:To study the inhibitory effects of adenovirus mediated vascular endothelial cell growth inhibitor 151(VEGI_(151)) on venous endothelial cell proliferation. Methods: VEGI_(151) gene was cloned into adenovirus vector pCA13 and the product was packaged and amplified with 293A cells.The expressed protein was identified by Western blot. X-gal staining was used to determine the transfection efficiency of the recombinant adenovirus system. The inhibitory effect of Ad-VEGI_(151) on ECV304 cell proliferarion was observed and assessed by violet crystal assay. The protein expression of VEGI_(151) gene in ECV304 cells was detected by immunohistochemistry. Results: Liposome-mediated pCA13-VEGI_(151) and pJM17 cotransfection of 293A cells (through homologous recombination of intracellular plasmid) is a practical and feasible method to obtain high-titre recombinant adenovirus. The constructed Ad-VEGI_(151), with high transfection efficiency, significantly inhibited ECV304 cells proliferation and expressed functional protein in target cells. Conclusion: Ad-VEGI_(151) can express bioactive protein in target cells and can inhibit the proliferation of venous endothelial cells, and this may pave a new way for gene therapy of tumors and neovascular diseases.

Transforming growth factor-? and primary open-angle glaucoma / 第二军医大学学报

As a multifunctional cytokine,transforming growth factor-?(TGF-?) has many biological effects. It controls the extracellular matrix synthesis in trabecular meshwork cells and enhances the contractility of trabecular cells,which may increase the resistance of aqueous outflow. It can also promote the formation of the bleb scarring after filtration surgery. TGF-? is likely to play an important role in the pathogenesis and mechanism of primary open-angle glaucoma (POAG). The inhibitions of TGF-? may be used as an auxiliary agent for inhibiting the formation of the bleb scarring after filtration surgery.