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J Virol, February 1998, p. 1552-1576, Vol. 72, No. 2
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Immunological and Virological Analyses of Persons
Infected by Human Immunodeficiency Virus Type 1 while Participating in
Trials of Recombinant gp120 Subunit Vaccines
R. I.
Connor,1
B. T. M.
Korber,2
B.
S.
Graham,3
B. H.
Hahn,4
D. D.
Ho,1
B. D.
Walker,5
A. U.
Neumann,2
S. H.
Vermund,4
J.
Mestecky,4
S.
Jackson,4
E.
Fenamore,1
Y.
Cao,1
F.
Gao,4
S.
Kalams,5
K. J.
Kunstman,6
D.
McDonald,2
N.
McWilliams,6
A.
Trkola,1
J. P.
Moore,1 and
S. M.
Wolinsky6,*
The Aaron Diamond AIDS Research Center, The
Rockefeller University, New York, New York
100161;
Theoretical Division, Los
Alamos National Laboratory, Los Alamos, New Mexico
875452;
Department of Medicine,
Vanderbilt University School of Medicine, Nashville, Tennessee
372323;
Departments of Medicine,
Microbiology, and Epidemiology, University of Alabama at
Birmingham, Birmingham, Alabama 352944;
AIDS Research Center, Massachusetts General Hospital and
Harvard Medical School, Charlestown, Massachusetts
021295; and
Department of Medicine,
Northwestern University Medical School, Chicago, Illinois
606116
Received 15 July 1997/Accepted 4 November 1997
We have studied 18 participants in phase I/II clinical trials of
recombinant gp120 (rgp120) subunit vaccines (MN and SF-2) who became
infected with human immunodeficiency virus type 1 (HIV-1) during the
course of the trials. Of the 18 individuals, 2 had received a placebo
vaccine, 9 had been immunized with MN rgp120, and seven had been
immunized with SF-2 rgp120. Thirteen of the 18 infected vaccinees had
received three or four immunizations prior to becoming infected. Of
these, two were placebo recipients, six had received MN rgp120, and
five had received SF-2 rgp120. Only 1 of the 11 rgp120 recipients who
had multiple immunizations failed to develop a strong immunoglobulin G
antibody response to the immunogen. However, the antibody response to
rgp120 was transient, typically having a half-life of 40 to 60 days. No
significant neutralizing activity against the infecting strain was
detected in any of the infected individuals at any time prior to
infection. Antibody titers in subjects infected despite vaccination and
in noninfected subjects were not significantly different.
Envelope-specific cytotoxic T-lymphocyte responses measured after
infection were infrequent and weak in the nine vaccinees who were
tested. HIV-1 was isolated successfully from all 18 individuals.
Sixteen of these strains had a non-syncytium-inducing (NSI) phenotype,
while two had a syncytium-inducing (SI) phenotype. NSI strains used the
CCR5 coreceptor to enter CD4+ cells, while an SI strain
from one of the vaccinees also used CXCR4. Viruses isolated from the
blood of rgp120 vaccinees were indistinguishable from viruses isolated
from control individuals in terms of their inherent sensitivity to
neutralization by specific monoclonal antibodies and their replication
rates in vitro. Furthermore, genetic sequencing of the env
genes of strains infecting the vaccinees did not reveal any features
that clearly distinguished these viruses from contemporary clade B
viruses circulating in the United States. Thus, despite rigorous
genetic analyses, using various breakdowns of the data sets, we could
find no evidence that rgp120 vaccination exerted selection pressure on
the infecting HIV-1 strains. The viral burdens in the infected rgp120
vaccine recipients were also determined, and they were found to be not
significantly different from those in cohorts of placebo-vaccinated and
nonvaccinated individuals. In summary, we conclude that vaccination
with rgp120 has had, to date, no obvious beneficial or adverse effects
on the individuals we have studied.
*
Corresponding author. Mailing address: Department of
Medicine, Northwestern University Medical School, Tarry Building, Room 3-735, 303 E. Chicago Ave., Chicago, IL 60611. Phone: (312) 908-5210. Fax: (312) 908-4588. E-mail: s-wolinsky{at}nwu.edu.
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