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J. Virol., 07 1997, 5069-5079, Vol 71, No. 7
KS Cole, JL Rowles, BA Jagerski, M Murphey-Corb, T Unangst, JE Clements, J Robinson, MS Wyand, RC Desrosiers and RC Montelaro
Previous studies of attenuated simian immunodeficiency virus (SIV) vaccines
in rhesus macaques have demonstrated the development of broad protection
against experimental challenge, indicating the potential for the production
of highly effective immune responses to SIV antigens. However, the
development of this protective immune status was found to be critically
dependent on the length of time postvaccination with the attenuated virus
strain, suggesting a necessary maturation of immune responses. In this
study, the evolution of SIV envelope-specific antibodies in monkeys
experimentally infected with various attenuated strains of SIV was
characterized by using a comprehensive panel of serological assays to
assess the progression of antibodies in longitudinal serum samples that
indicate the development of protective immunity. In parallel studies, we
also used the same panel of antibody assays to characterize the properties
of SIV envelope-specific antibodies elicited by inactivated whole-virus and
envelope subunit vaccines previously reported to be ineffective in
producing protective immunity. The results of these studies demonstrate
that the evolution of protective immunity in monkeys inoculated with
attenuated strains of SIV is associated with a complex and lengthy
maturation of antibody responses over the first 6 to 8 months
postinoculation, as reflected in progressive changes in antibody
conformational dependence and avidity properties. The establishment of
long-term protective immunity at this time in general parallels the absence
of further detectable changes in antibody responses and a maintenance of
relatively constant antibody titer, avidity, conformational dependence, and
the presence of neutralizing antibody for at least 2 years postinoculation.
In contrast to the mature antibody responses elicited by the attenuated SIV
vaccines, the whole-virus and envelope subunit vaccines in general elicited
only immature antibody responses characterized by poor reactivity with
native envelope proteins, low avidity, low conformational dependence, and
the absence of neutralization activity against the challenge strain. Thus,
these studies establish for the first time an association between the
effectiveness of experimental vaccines and the capacity of the vaccine to
produce a mature antibody response to SIV envelope proteins and further
indicate that a combination of several antibody parameters (including
titer, avidity, conformational dependence, and virus neutralization) are
superior to any single antibody parameter as prognostic indicators to
evaluate candidate AIDS vaccines.
Copyright © 1997, American Society for Microbiology
Evolution of envelope-specific antibody responses in monkeys experimentally infected or immunized with simian immunodeficiency virus and its association with the development of protective immunity
Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pennsylvania 15261, USA.
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