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Combined immunity of DNA vector and recombinant vaccinia virus expressing Gag proteins of equine infectious anemia virus

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Chinese Science Bulletin 2004年第21期49卷 2272-2276页

作者： DAIChunming ZHANGXiaoyan WANGShuhui LIUYing DUANDanli SHEN-Rongxian SHAOYiming DivisionofResearchonVirologyandImmunology NationalCenterforAIDS/STDControlandPreventionCDCBeijing100050China divisionofresearchoneiav HarbinVeterinaryResearchInstituteHarbin150001China

In order to develop a new vaccine candidate for equine infectious anemia virus (EIAV), gag gene of Chinese donkey leukocyte attenuated strain (EIAV DLV) and its pa- rental virulent strain (EIAV LN) were inserted respectively into the TK region of the Tiantan strain (VV) of vaccinia virus by homologous recombination and the positive clone was confirmed by blue plaque assay. Protein expression was examined by Western blot. Prime and prime-boost proce- dures were used to immunize mice with two DNA vectors and two recombinant vaccinia viruses expressing EIAV Gag pro- teins. The results showed that the specific lysis of CTL re- sponses in the DNA+rVV groups was stronger than those in the DNA groups, amounting to 31%. Although the levels of specific antibodies were not significantly different, we could conclude that the recombinant vaccinia virus could boost the cellular responses following DNA vector priming. There was no detectable difference between the immune responses in- duced by DLV and LN Gag proteins. This data demonstrates that the combined immunity of DNA vector and recombinant vaccinia virus expressing EIAV gag proteins, utilizing the prime-boost procedure, can drive immunized mice to pro- duce powerful cellular responses. These results lay an im- portant foundation for the development of a new EIAV ge- netic engineering vaccine.

关键词： DNA VV LN CTL

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