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J. Virol., 10 1995, 6239-6248, Vol 69, No. 10
M Girard, B Meignier, F Barre-Sinoussi, MP Kieny, T Matthews, E Muchmore, PL Nara, Q Wei, L Rimsky and K Weinhold
The extraordinary genetic diversity of human immunodeficiency virus type 1
(HIV-1) is a major problem to overcome in the development of an effective
vaccine. In the most reliable animal model of HIV-1 infection, chimpanzees
were immunized with various combinations of HIV- 1 antigens, which were
derived primarily from the surface glycoprotein, gp160, of HIV-1 strains
LAI and MN. The immunogens also included a live recombinant canarypox virus
expressing a gp160-MN protein. In one experiment, two chimpanzees were
immunized multiple times; one animal received antigens derived only from
HIV-1LAI, and the second animal received antigens from both HIV-1LAI and
HIV-1MN. In another experiment, four chimpanzees were immunized in parallel
a total of five times over 18 months; two animals received purified gp160
and V3-MN peptides, whereas the other two animals received the recombinant
canarypox virus and gp160. At 3 months after the final booster, all
immunized and naive control chimpanzees were challenged by intravenous
inoculation of HIV-1SF2; therefore, the study represented an intrasubtype B
heterologous virus challenge. Virologic and serologic follow-up showed that
the controls and the two chimpanzees immunized with the live recombinant
canarypox virus became infected, whereas the other animals that were
immunized with gp160 and V3-MN peptides were protected from infection.
Evaluation of both cellular and humoral HIV- specific immune responses at
the time of infectious HIV-1 challenge identified the following as possible
correlates of protection: antibody titers to the V3 loop of MN and
neutralizing antibody titers to HIV-1MN or HIV-1LAI, but not to HIV-1SF2.
The results of this study indicate that vaccine-mediated protection against
intravenous infection with heterologous HIV-1 strains of the same subtype
is possible with some immunogens.
Copyright © 1995, American Society for Microbiology
Vaccine-induced protection of chimpanzees against infection by a heterologous human immunodeficiency virus type 1
Institut Pasteur, Paris, France.
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