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Replicon Particle Expressing the E2 Glycoprotein of Bovine Viral Diarrhea Virus Immunization and Evaluation of Antibody Response.

Abstract：

:The objective of this study was to develop a new antigen delivery system using an alphavirus replicon particle (RP) to induce humoral antibody responses against bovine viral diarrhea virus (BVDV) recombinant antigen produced from envelope glycoprotein E2. An alphavirus RP expressing the E2 glycoprotein of BVDV was used for immunization of pigs. A fluorescent microsphere immunoassay (FMIA) has been applied to detect BVDV E2 antigen-specific antibody isotype in pig immunized with alphavirus RP. Full-length BVDV E2 (aa 1-375) was cleaved into several pieces, eight E2 DNA fragments, including full-length DNA, were cloned into expression vector pHUE, and the recombinant proteins expressed in BL-21 (DE3) Escherichia coli. After successful conjugation of purified proteins with microsphere beads, a multiplex FMIA platform was constructed, and BVDV E2 alphavirus-based RP-immunized animal serum samples were tested in the presence of bead-bound antigen targets. The results were represented as mean fluorescence intensity (MFI); the MFI values were converted to sample value/positive value (S/P) ratios. BVDV E2 (aa 1-183) showed the highest MFI values of eight recombinant E2 fragments when the specific activity of each fragment was tested. In immunized animals, data for BVDV E2-specific IgA, IgG, and IgM in serum and only IgG and IgA in oral fluids were recorded. The MFI values for the positive serum sample showed a 100-fold increase compared with the negative serum sample. Antibody isotype to BVDV E2 antigens showed that IgG > IgM > IgA in serum, whereas IgG > IgA > IgM in oral fluids. The data presented in this study suggested that boosting with the same doses of alphavirus RP in 3-week intervals may potentially enhance antibody response. The experimental results demonstrate that alphavirus RP-expressing BVDV E2 antigen induces antibody response in pig.

journal_name

Viral Immunol

journal_title

Viral immunology

authors

Hossain MM,Rowland RR

doi

10.1089/vim.2017.0053

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

55-61

issue

1

eissn

0882-8245

issn

1557-8976

journal_volume

31

pub_type

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