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Journal of Virology, October 1999, p. 8201-8215, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Role of Immune Responses against the Envelope and the Core
Antigens of Simian Immunodeficiency Virus SIVmne in Protection
against Homologous Cloned and Uncloned Virus Challenge in
Macaques
Patricia S.
Polacino,1
Virginia
Stallard,1,
James E.
Klaniecki,2,
Sridhar
Pennathur,2,§
David C.
Montefiori,3
Alphonse J.
Langlois,3
Barbra A.
Richardson,4
William R.
Morton,1
Raoul E.
Benveniste,5 and
Shiu-Lok
Hu1,2,*
Regional Primate Research
Center1 and Department of
Biostatistics,4 University of Washington, and
Bristol-Myers Squibb Pharmaceutical Research
Institute,2 Seattle, Washington; Duke
University Medical Center, Durham, North
Carolina3; and National Cancer
Institute, Frederick, Maryland5
Received 15 March 1999/Accepted 2 July 1999
We previously showed that envelope (gp160)-based vaccines, used in
a live recombinant virus priming and subunit protein boosting regimen,
protected macaques against intravenous and intrarectal challenges with
the homologous simian immunodeficiency virus SIVmne clone E11S.
However, the breadth of protection appears to be limited, since the
vaccines were only partially effective against intravenous challenge by
the uncloned SIVmne. To examine factors that could affect the breadth
and the efficacy of this immunization approach, we studied (i) the
effect of priming by recombinant vaccinia virus; (ii) the role of
surface antigen gp130; and (iii) the role of core antigens (Gag and
Pol) in eliciting protective immunity. Results indicate that (i)
priming with recombinant vaccinia virus was more effective than subunit
antigen in eliciting protective responses; (ii) while both gp130 and
gp160 elicited similar levels of SIV-specific antibodies, gp130 was not
as effective as gp160 in protection, indicating a possible role for the
transmembrane protein in presenting functionally important epitopes;
and (iii) although animals immunized with core antigens failed to
generate any neutralizing antibody and were infected upon challenge,
their virus load was 50- to 100-fold lower than that of the controls, suggesting the importance of cellular immunity or other core-specific immune responses in controlling acute infection. Complete protection against intravenous infection by the pathogenic uncloned SIVmne was
achieved by immunization with both the envelope and the core antigens.
These results indicate that immune responses to both antigens may
contribute to protection and thus argue for the inclusion of multiple
antigens in recombinant vaccine designs.
*
Corresponding author. Present address: Regional Primate
Research Center, University of Washington, 3000 Western Ave., Seattle, WA 98121. Phone: (206) 616-9764. Fax: (206) 956-0573. E-mail: hus{at}u.washington.edu.

Present address: Sequim,
Wash.

Present address: Seattle,
Wash.
§
Present address: Aviron, Mountain View,
Calif.
Journal of Virology, October 1999, p. 8201-8215, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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