HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Dayball, K. Articles by Bramson, J. Search for Related Content PubMed PubMed Citation Articles by Dayball, K. Articles by Bramson, J.

Electroporation Enables Plasmid Vaccines to Elicit CD8⁺ T Cell Responses in the Absence of CD4⁺ T Cells¹

Center for Gene Therapeutics, Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada

In vivo electroporation dramatically enhances plasmid vaccine efficacy. This enhancement can be attributed to increased plasmid delivery and, possibly, to some undefined adjuvant properties. Previous reports have demonstrated CD8⁺ T cell priming by plasmid vaccines is strongly dependent upon CD4⁺ T cell help. Indeed, the efficacy of a plasmid vaccine expressing Escherichia coli -galactosidase was severely attenuated in MHC class II-deficient (C2D) mice. To determine whether electroporation could compensate for the absence of CD4⁺ T cell help, C2D mice were immunized by a single administration of plasmid in combination with electroporation using two conditions which differed only by the duration of the pulse (20 or 50 msec). Both conditions elicited robust cellular and humoral responses in wild-type mice, as measured by IFN- ELISPOT, anti--galactosidase ELISA, and protection from virus challenge. In C2D mice, the cellular response produced by the vaccine combined with the 50-msec pulse, as measured by ELISPOT, was identical to the response in wild-type mice. The 20-msec pulse elicited a milder response that was approximately one-fifth that of the response elicited by the 50-msec pulse. By contrast, the 20-msec conditions provided comparable protection in both wild-type and C2D recipients whereas the protection elicited by the 50-msec conditions in C2D mice was weaker than in wild-type mice. Further investigation is required to understand the discordance between the ELISPOT results and outcome of virus challenge in the C2D mice. Nonetheless, using this technique to prime CD8⁺ T cells using plasmid vaccines may prove extremely useful when immunizing hosts with limiting CD4⁺ T cell function, such as AIDS patients.

This article has been cited by other articles:

				K. Kianizad, L. A. Marshall, N. Grinshtein, D. Bernard, R. Margl, S. Cheng, F. Beermann, Y. Wan, and J. Bramson Elevated Frequencies of Self-reactive CD8+ T Cells following Immunization with a Xenoantigen Are Due to the Presence of a Heteroclitic CD4+ T-Cell Helper Epitope Cancer Res., July 1, 2007; 67(13): 6459 - 6467. [Abstract] [Full Text] [PDF]

				T.-C. Yang, J. Millar, T. Groves, N. Grinshtein, R. Parsons, S. Takenaka, Y. Wan, and J. L. Bramson The CD8+ T Cell Population Elicited by Recombinant Adenovirus Displays a Novel Partially Exhausted Phenotype Associated with Prolonged Antigen Presentation That Nonetheless Provides Long-Term Immunity J. Immunol., January 1, 2006; 176(1): 200 - 210. [Abstract] [Full Text] [PDF]

				S. Buchan, E. Gronevik, I. Mathiesen, C. A. King, F. K. Stevenson, and J. Rice Electroporation as a "Prime/Boost" Strategy for Naked DNA Vaccination against a Tumor Antigen J. Immunol., May 15, 2005; 174(10): 6292 - 6298. [Abstract] [Full Text] [PDF]