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Liu W.,Northeast Agricultural University | Yuan C.,Northeast Agricultural University | Bao J.,Northeast Agricultural University | Guan W.,Northeast Agricultural University | And 5 more authors.
Applied Microbiology and Biotechnology | Year: 2014

Live attenuated bacteria delivered orally are interesting tools for mucosal immunization. The objective of this study was to construct a novel counter-selection platform based on an attenuated wild-type Escherichia coli (E. coli) strain and to utilize it for the delivery of LTR192G-STaA13Q fusion protein as an oral vaccine. First, a counter-selectable marker, namely, PRPL-Kil, was inserted into an attenuated wild-type E. coli strain through the use of the red and G-DOC homologous recombination systems to construct the counter-selection platform, and PRPL-Kil was subsequently replaced by the LT192-STa13 fusion gene to construct the oral vaccine O142 (yaiT::LT192-STa13) (ER-A). Subsequently, BALB/c mice were orogastrically inoculated with ER-A. Our results showed that ER-A could induce the production of specific IgA and IgG against fimbriae (F41) and enterotoxins (LT and STa), with neutralizing activity in BALB/c mice. In addition, assays of cellular immune responses showed that the stimulation index (SI) values of immunized mice were significantly higher than those of control mice (P < 0.05), and revealed a marked shift toward Th2-mediated immunity. These findings suggest that ER-A is a suitable candidate for an oral vaccine strain to protect animals from enter toxigenic Escherichia coli (ETEC) infection. © 2014, Springer-Verlag Berlin Heidelberg. Source

Fu Y.-S.,Heilongjiang Research Center for Stem Cell Engineering | Zhang Y.,Heilongjiang Research Center for Stem Cell Engineering
Chinese Journal of Tissue Engineering Research | Year: 2014

Background: Currently, cosmetic liposuction has developed rapidly, but the liposuction for the isolation of adipose-derived stem cells has not been reported. Objective:By evaluating the quantity and viability of stromal vascular fraction, adipocytes and adipose-derived stem cells obtained from different typesof liposuctions, to find the advanced liposuction procedures that are most suitable for use in preparation, preservation and clinical application of adipose-derived stem cells. Methods: Authors retrieved PubMed database, NIH clinical trial databaseand CNKI full text database for relevant articles using the key words of "adipose-derived stem cells, ADSCs, liposuction, SAL, UAL, PAL, WAL" in English and Chinese, respectively. After eliminating the objective-independent articles and repeating reviews, 50 papers were included for further analysis. Results and Conclusion:Suction-assisted liposuction (SAL), ultrasound-assisted liposuction (UAL), power-assisted liposuction (PAL) and water-assisted liposuction (WAL) are four major types of fat-harvesting technologies that can possibly be applied for adipose-derived stem cells isolation. Accumulative evidence suggests that these advanced liposuctions can obtain highquality of adipose tissue/cells, which are good enough for autologous fat grafting. Adipose-derived stem cells that are isolated from lipoaspirate by WAL, SAL and UAL, can be used as autologous cell-assisted lipotransfer and regenerative therapy. In summary, although each of these four types of liposuction technologies has its own advantages and is feasible tobe used as autologous fat grafting, systematic comparative studies for viability, chromosome stability and differentiation potentials of adipose-derived stem cells isolated using each collecting method are necessary in order to confirm the future perspectives in adipose-derived stem cells isolation, banking and regenerative repair. Source

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