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. 1997 Jan;71(1):169–178. doi: 10.1128/jvi.71.1.169-178.1997

Improvement of hepatitis B virus DNA vaccines by plasmids coexpressing hepatitis B surface antigen and interleukin-2.

Y H Chow 1, W L Huang 1, W K Chi 1, Y D Chu 1, M H Tao 1
PMCID: PMC191037  PMID: 8985336

Abstract

DNA vaccines encoding a viral protein have been shown to induce antiviral immune responses and provide protection against subsequent viral challenge. In this study, we show that the efficacy of a DNA vaccine can be greatly improved by simultaneous expression of interleukin-2 (IL-2). Plasmid vectors encoding the major (S) or middle (pre-S2 plus S) envelope proteins of hepatitis B virus (HBV) were constructed and compared for their potential to induce hepatitis B surface antigen (HBsAg)-specific immune responses with a vector encoding the middle envelope and IL-2 fusion protein or with a bicistronic vector separately encoding the middle envelope protein and IL-2. Following transfection of cells in culture with these HBV plasmid vectors, we found that the encoded major protein was secreted while the middle protein and the fusion protein were retained on the cell membrane. Despite differences in localization of the encoded antigens, plasmids encoding the major or middle proteins gave similar antibody and T-cell proliferative responses in the vaccinated animals. The use of plasmids coexpressing IL-2 and the envelope protein in the fusion or nonfusion context resulted in enhanced humoral and cellular immune responses. In addition, the vaccine efficacy in terms of dosage used in immunization was increased at least 100-fold by coexpression of IL-2. We also found that DNA vaccines coexpressing IL-2 help overcome major histocompatibility complex-linked nonresponsiveness to HBsAg vaccination. The immune responses elicited by HBV DNA vaccines were also modulated by coexpression of IL-2. When restimulated with antigen in vitro, splenocytes from mice that received plasmids coexpressing IL-2 and the envelope protein produced much stronger T helper 1 (Th1)-like responses than did those from mice that had been given injections of plasmids encoding the envelope protein alone. Coexpression of IL-2 also increased the Th2-like responses, although the increment was much less significant.

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Selected References

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