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Infection and Immunity, September 1999, p. 4780-4786, Vol. 67, No. 9
0019-9567/99/$04.00+0

Immunogenicity of DNA Vaccines Expressing Tuberculosis Proteins Fused to Tissue Plasminogen Activator Signal Sequences

Zhongming Li, Angela Howard, Cynthia Kelley, Giovanni Delogu, Frank Collins, and Sheldon Morris*

Laboratory of Mycobacteria, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland 20892

Received 14 January 1999/Returned for modification 17 February 1999/Accepted 16 June 1999

Novel tuberculosis DNA vaccines encoding native ESAT-6, MPT-64, KatG, or HBHA mycobacterial proteins or the same proteins fused to tissue plasminogen activator (TPA) signal sequences were evaluated for their capacity to elicit humoral, cell-mediated, and protective immune responses in vaccinated mice. While all eight plasmids induced specific humoral responses, the constructs expressing the TPA fusions generally evoked higher antibody responses in vaccinated hosts. Although most of the DNA vaccines tested induced a substantial gamma interferon response in the spleen, the antigen-specific lung responses were 2- to 10-fold lower than the splenic responses at the time of challenge. DNA vaccines encoding the ESAT-6, MPT-64, and KatG antigens fused to TPA signal sequences evoked significant protective responses in mice aerogenically challenged with low doses of Mycobacterium tuberculosis Erdman 17 to 21 days after the final immunization. However, the protective response induced by live Mycobacterium bovis BCG vaccine was greater than the response induced by any of the DNA vaccines tested. These results suggest that the tuberculosis DNA vaccines were able to elicit substantial immune responses in suitably vaccinated mice, but further refinements to the constructs or the use of alternative immunization strategies will be needed to improve the efficacy of these vaccine candidates.

* Corresponding author. Mailing address: Laboratory of Mycobacteria, OVRR/CBER/FDA, HFM-431, Building 29, Room 502, 29 Lincoln Dr., Bethesda, MD 20892. Phone: (301) 496-5978. Fax: (301) 402-2776. E-mail: morris{at}cber.fda.gov.

Infection and Immunity, September 1999, p. 4780-4786, Vol. 67, No. 9
0019-9567/99/$04.00+0


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