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A DNA vaccine co-expressing Trichinella spiralis MIF and MCD-1 with murine ubiquitin induces partial protective immunity in mice

Published online by Cambridge University Press:  05 January 2012

F. Tang
Affiliation:
College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
L. Xu
Affiliation:
College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
R. Yan
Affiliation:
College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
X. Song
Affiliation:
College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
X. Li*
Affiliation:
College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
*
* Fax: +86 25 84399000, E-mail: lixiangrui@njau.edu.cn

Abstract

Co-expression of Trichinella spiralis macrophage migration inhibitory factor (TsMIF) with T. spiralis cystatin-like domain protein (TsMCD-1) in a DNA vaccine induces a Th1 immune response and partial protection against T. spiralis infection. The present study evaluated whether co-expression of mouse ubiquitin (Ub) with TsMIF and TsMCD-1 might improve the immune response against T. spiralis infection. Groups of BALB/c mice were immunized twice at 2-week intervals with 100 μg of plasmid DNA encoding either a TsMIF–TsMCD-1 fusion protein (pVAX1-Tsmif-Tsmcd-1) or an Ub-co-expressing triple fusion protein Ub–TsMIF–TsMCD-1 (pVAX1-Ub-Tsmif-Tsmcd-1). Control animals were immunized with pVAX1-Ub or blank vector plasmid. Specific antibody levels (IgG, IgG1, IgG2a, IgG2b, IgM, IgA, IgE) against the recombinant protein TsMIF–TsMCD-1, serum cytokines (interferon (IFN)-γ, interleukin (IL)-4, IL-5, transforming growth factor (TGF)-β1 and IL-17), CD4+/CD8+ T cells and cytotoxic T lymphocyte (CTL) responses were monitored. Challenge infection was performed 2 weeks after the second immunization and worm burden was assayed at 35 days post-challenge. Antibody responses induced by pVAX1-Ub-Tsmif-Tsmcd-1 were significantly lower than for TsMIF-TsMCD-1, but the vaccine induced increased levels of Th1 cytokine (IFN-γ) and increased T-cell cytotoxicity. The reduction of worm burden (37.95%) following immunization with pVAX1-Ub-Tsmif-Tsmcd-1 was significantly greater than that induced by the pVAX1-Tsmif-Tsmcd-1 vaccine (23.17%; P< 0.05).

Type
Research Papers
Copyright
Copyright © Cambridge University Press 2012

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