Journal of Southern Medical University ›› 2014, Vol. 34 ›› Issue (01): 14-.
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Abstract: Objective To construct a humulus pollen allergy DNA vaccine pcDNA3.1-Hum and investigate its effect for immuneprotection mediated by Foxp3+Treg cells in asthmatic mice. Methods The target humulus gene obtained from pTripIEx2-Humplasmid by double enzyme digestion was inserted sequentially into pcDNA3.1(-) vector to generate the recombinant plasmidpcDNA3.1-Hum, which was validated by sequencing. The pcDNA3.1-Hum plasmid was transfected into COS-7 cells and theexpression of the ectopic protein was analyzed using Western blotting. Co-cultured dendritic cells and CD4+CD25- T cells werestimulated with the expressed protein to test its efficacy in inducing Foxp3+Treg cells. The levels of humulus-specific IgE andIgG2a were assayed to evaluate the allergenicity and immunogenicity of pcDNA3.1-Hum in mice. The immunoprotectiveeffect of pcDNA3.1-Hum was assessed in a mouse model of humulus-specific asthma. Results The constructedpcDNA3.1-Hum plasmid was validated by sequencing and Western blotting, and the expressed protein was shown to induceFoxp3+Treg cells in the co-culture. In normal mice, pcDNA3.1-Hum induced a significant increase of humulus-specific IgG2abut had no effect on IgE. In the asthmatic mice, pcDNA3.1-Hum significantly decreased inflammatory cell counts andeosinophil percentages in the BALF, ameliorated lung inflammation, and lowered AHR and IL-4 levels; immunization of themice with pcDNA3.1-Hum reversed humulus-induced reduction of serum IFN-γ and prevented the humulus-triggeredreduction of Foxp3+Treg cell percentage in the spleen. Conclusion We have successfully constructed a highly immunogenicpcDNA3.1-Hum DNAvaccine that can mediate immune protection by inducing Foxp3+Treg cells.
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https://www.j-smu.com/EN/Y2014/V34/I01/14