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Journal of Virology, December 1999, p. 10214-10223, Vol. 73, No. 12
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Altering the Cellular Location of an Antigen Expressed by a DNA-Based Vaccine Modulates the Immune Response

P. J. Lewis,dagger S. van Drunen Littel-van den Hurk, and L. A. Babiuk*

Veterinary Infectious Disease Organization, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E3, Canada

Received 9 June 1999/Accepted 9 September 1999

The potential for DNA vaccines encoding mutated versions of the same antigen to modulate immune responses in C3H/HeN mice was investigated. We created expression plasmids that encoded several versions of glycoprotein D (gD) from bovine herpesvirus 1, including authentic membrane-anchored glycoprotein (pSLRSV.AgD), a secreted glycoprotein (pSLRSV.SgD), and an intracellular protein (pSLRSV.CgD). Immunization of an inbred strain of mice with these plasmids resulted in highly efficacious and long-lasting humoral and cell-mediated immunity. We also demonstrated that the cell compartment in which plasmid-encoded gD was expressed caused a deviation in the serum immunoglobulin (Ig) isotype profile as well as the predominant cytokines secreted from the draining lymph node. Immunization of C3H/HeN mice with DNA vaccines encoding cell-associated forms of gD resulted in a predominance of serum IgG2a and gamma interferon-secreting cells within the spleens and draining lymph nodes. In contrast, mice immunized with a secreted form of this same antigen displayed immune responses characterized by greater levels of interleukin 4 in the draining lymph node and IgG1 as the predominant serum isotype. We also showed evidence of compartmentalization of distinct immune responses within different lymphoid organs.


* Corresponding author. Mailing address: Veterinary Infectious Disease Organization, University of Saskatchewan, 120 Veterinary Rd., Saskatoon, Saskatchewan S7N 5E3, Canada. Phone: (306) 966-7465. Fax: (306) 966-7478. E-mail: babiuk{at}sask.usask.ca.

dagger Present address: Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island C1A 4P3, Canada.


Journal of Virology, December 1999, p. 10214-10223, Vol. 73, No. 12
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.



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Copyright © 1999 by the American Society for Microbiology. All rights reserved.