Previous Article | Next Article ![]()
J. Virol., Mar 1996, 1953-1960, Vol 70, No. 3
SP Mossman, F Bex, P Berglund, J Arthos, SP O'Neil, D Riley, DH Maul, C Bruck, P Momin, A Burny, PN Fultz, JI Mullins, P Liljestrom and EA Hoover
Infection of pigtail macaques with SIVsmmPBj14, biological clone 3 (SIV-
PBj14-bc13), produces an acute and usually fatal shock-like syndrome 7 to
14 days after infection. We used this simian immunodeficiency virus (SIV)
model as a rapid and rigorous challenge to evaluate the efficacy of two SIV
Env vaccine strategies. Groups of four pigtail macaques were immunized four
times over a 25-week span with either a recombinant Semliki Forest virus
expressing the SIV-PBj14 Env gp160 (SFV-SIVgp160) or purified recombinant
SIV-PBj14 gp120 (rgp120) in SBN-1 adjuvant. Antibody titers to SIV Env
developed in all immunized animals (mean peak titers prior to challenge,
1:1,700 for SFV-SIV gp 160 and 1:10,500 for rgp120), but neither
neutralizing antibodies nor SIV-specific T- cell proliferative responses
were detectable in any of the vaccinees. All macaques were challenged with
a 100% infectious, 75% fatal dose of SIV-PBj14-bc13 at week 26. Three of
four control animals died of acute SIV-PBj14 syndrome on days 12 and 13. By
contrast, all four SFV- SIVgp160-immunized animals and three of the four
rgp120-immunized animals were protected from lethal disease. While all
virus-challenged animals became infected, symptoms of the SIV-PBj14
syndrome were more severe in controls than in vaccinees. Mean virus titers
in plasma at 13 days postchallenge were approximately 10-fold lower in
vaccinated than control animals. However, there was no apparent correlation
between survival and levels of peripheral blood mononuclear cell-associated
culturable virus, provirus load, or any antiviral immunologic parameter
examined. The results indicate that while immunization with SFV- SIVgp160
and rgp120 did not protect against virus infection, these Env vaccines did
lower the virus load in plasma and protect against the lethal SIV-PBj14
challenge.
Copyright © 1996, American Society for Microbiology
Protection against lethal simian immunodeficiency virus SIVsmmPBj14 disease by a recombinant Semliki Forest virus gp160 vaccine and by a gp120 subunit vaccine
Department of Pathology, Colorado State University, Fort Collins 80523, USA.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»