Virus-specific cytotoxic T-lymphocyte activity elicited by coimmunization with human immunodeficiency virus type 1 genes regulated by the bacteriophage T7 promoter and T7 RNA polymerase protein.

Abstract:

:Cytotoxic T lymphocyte (CTL) activity was assessed in mice immunized with DNA plasmids containing the human immunodeficiency virus type 1 (HIV-1) gp120 envelope (pTMIgp120) or p55gag (pTMIgag) gene regulated by the bacteriophage T7 promoter. Immunization with either plasmid resulted in CTL activity against class I major histocompatibility complex-restricted viral epitopes when coadministered with a recombinant vaccinia virus expressing the T7 RNA polymerase protein (T7 RNAP) but not a control vaccinia virus. Recombinant vaccinia-T7 RNAP virus (VTF7-3) could be replaced with a noninfectious source of T7 RNAP. A three-component vaccine consisting of pTMIgag, a recombinant subunit T7 RNAP protein, and a plasmid (pT7T7) encoding T7 RNAP under the control of its own promoter induced gag-specific CTL activity. Intramuscular immunization with the pTMIgag plasmid delivered with either the T7 RNAP protein or pT7T7 plasmid alone also induced HIV-1-specific CTL. Thus, there is adventitious expression of the pT7T7 plasmid in vivo, and enough T7 RNAP is produced to result in production of p24gag protein from the pTMIgag plasmid. The results demonstrate that regulated expression of genes in vivo is possible with this T7-based expression system, and may be useful in vaccine settings where short-term cytoplasmic expression of protein in antigen presenting cells is desired.

journal_name

J Virol

journal_title

Journal of virology

authors

Selby MJ,Doe B,Walker CM

doi

10.1128/JVI.71.10.7827-7831.1997

subject

Has Abstract

pub_date

1997-10-01 00:00:00

pages

7827-31

issue

10

eissn

0022-538X

issn

1098-5514

journal_volume

71

pub_type

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