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Induction of neutralizing antibodies against bovine leukosis virus in rabbits by vaccination with recombinant vaccinia virus expressing bovine leukosis virus envelope glycoprotein



Induction of neutralizing antibodies against bovine leukosis virus in rabbits by vaccination with recombinant vaccinia virus expressing bovine leukosis virus envelope glycoprotein



American Journal of Veterinary Research 51(8): 1170-1173



Three kinds of recombinant vaccinia virus (RVV)--mO-HA/ATI, LO1-HA/ATI and mO-HA/7.5kD--expressing bovine leukosis virus (BLV) envelope glycoprotein (gp60) were constructed. The BLV envelope gene of RVV mO-HA/ATI and LO1-HA/ATI or of RVV mO-HA/7.5kD was expressed under control of the promoter of A-type inclusion body (ATI) protein gene of cow-pox virus or vaccinia virus 7.5-kD protein gene, respectively. The vaccinia virus strain, LC16mO, was used as vector for RVV mO-HA/ATI and mO-HA/7.5kD, and strain LO-1 was used for RVV LO1-HA/ATI. Strains LC16mO and LO-1 are attenuated vaccine virus strains originating from the Lister original vaccinia virus. All 3 kinds of constructed RVV expressed gp60 in cultured rabbit kidney cells after infection; mO-HA/ATI expressed more antigen than did mO-HA/7.5kD. Rabbits vaccinated with RVV produced considerable antibody capable of inhibiting syncytium formation, as well as antibody with virion-binding ability. The RVV that used ATI promoter induced higher antibody titer than did the RVV that used 7.5-kD promoter. Results indicate that BLV gp60 is responsible for induction of neutralizing antibodies that suppress in vitro formation of syncytia among BLV-infected cells. Applicability of RVV, especially those using ATI promoter, was evaluated in a vaccine against bovine leukosis.

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Accession: 001861354

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PMID: 2167028



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