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Infection and Immunity, May 2001, p. 2858-2864, Vol. 69, No. 5
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.5.2858-2864.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Arg-Gingipain A DNA Vaccine Induces Protective Immunity against Infection by Porphyromonas gingivalis in a Murine Model

Hideo Yonezawa,* Kazuyuki Ishihara, and Katsuji Okuda

Oral Health Science Center, Department of Microbiology, Tokyo Dental College, Mihama-ku, Chiba-City, Chiba 261-8502, Japan

Received 24 October 2000/Returned for modification 10 January 2001/Accepted 5 February 2001

Arginine-specific cysteine proteinases (RgpA and RgpB) produced by the periodontal pathogen Porphyromonas gingivalis are suspected virulence factors and are involved in interrupting host defense mechanisms as well as in penetrating and destroying periodontal connective tissues. To induce a protective immune response against P. gingivalis, we constructed an rgpA DNA vaccine. BALB/c mice were immunized intradermally by Gene Gun with plasmid DNA carrying rgpA. Antibody responses against P. gingivalis were determined by an enzyme-linked immunosorbent assay. The rgpA DNA vaccine induced high levels of serum antibodies against P. gingivalis. Sera from the rgpA DNA vaccine-immunized mice diminished the proteolytic activity of RgpA and RgpB and inhibited the binding of P. gingivalis to a type I collagen sponge. Moreover, the sera effectively reduced the hemagglutination of P. gingivalis, indicating that the hemagglutinin activity of the organism is associated with RgpA. We found with a murine abscess model that mice immunized with the rgpA DNA vaccine were resistant to an invasive P. gingivalis W50 challenge. These results suggest that the rgpA DNA vaccine induced specific antibodies against the enzyme and that this vaccine could confer protective immunity against P. gingivalis infection.

* Corresponding author. Mailing address: Department of Microbiology, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba-City, Chiba 261-8502, Japan. Phone: 81-43-270-3742. Fax: 81-43-270-3744. E-mail: yonezawa{at}tdc.ac.jp.

Infection and Immunity, May 2001, p. 2858-2864, Vol. 69, No. 5
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.5.2858-2864.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

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