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Journal of Virology, November 2001, p. 10187-10199, Vol. 75, No. 21
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.21.10187-10199.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Role of CD8+ Lymphocytes in Control of Simian
Immunodeficiency Virus Infection and Resistance to Rechallenge
after Transient Early Antiretroviral Treatment
Jeffrey D.
Lifson,1,*
Jeffrey L.
Rossio,1
Michael
Piatak Jr.,1
Thomas
Parks,1
Li
Li,1
Rebecca
Kiser,2
Vicky
Coalter,2
Brad
Fisher,3
Bernard M.
Flynn,3
Susan
Czajak,4
Vanessa M.
Hirsch,5
Keith A.
Reimann,6
Joern E.
Schmitz,6
John
Ghrayeb,7
Norbert
Bischofberger,8
Martin A.
Nowak,9
Ronald C.
Desrosiers,4 and
Dominik
Wodarz9
Retroviral Pathogenesis Laboratory1
and Vaccine Support Laboratory,2 AIDS
Vaccine Program, SAIC Frederick, National Cancer Institute at
Frederick, Frederick, Maryland 21702; Animal Sciences Branch,
National Cancer Institute, Bethesda, Maryland
208923; New England Regional Primate
Research Center, Harvard Medical School, Southborough,
Massachusetts 017724; Laboratory of
Molecular Microbiology, National Institute of Allergy and
Infectious Diseases, National Institutes of Health, Rockville, Maryland
208525; Division of Viral
Pathogenesis, Beth Israel Deaconess Medical Center, Boston,
Massachusetts 022156; Centocor, Inc.,
Malvern, Pennsylvania 193557; Gilead
Sciences, Inc., Foster City, California 944048;
and Program in Theoretical Biology, Institute of Advanced
Study, Princeton, New Jersey 085409
Received 26 March 2001/Accepted 30 July 2001
Transient antiretroviral treatment with tenofovir,
(R)-9-(2-phosphonylmethoxypropyl)adenine, begun
shortly after inoculation of rhesus macaques with the highly
pathogenic simian immunodeficiency virus (SIV) isolate SIVsmE660,
facilitated the development of SIV-specific lymphoproliferative
responses and sustained effective control of the infection following
drug discontinuation. Animals that controlled plasma viremia
following transient postinoculation treatment showed
substantial resistance to subsequent intravenous rechallenge with
homologous (SIVsmE660) and highly heterologous (SIVmac239) SIV
isolates, up to more than 1 year later, despite the absence of
measurable neutralizing antibody. In some instances, resistance to
rechallenge was observed despite the absence of detectable SIV-specific
binding antibody and in the face of SIV lymphoproliferative responses
that were low or undetectable at the time of challenge. In vivo
monoclonal antibody depletion experiments demonstrated a critical role
for CD8+ lymphocytes in the control of viral replication;
plasma viremia rose by as much as five log units after depletion of
CD8+ cells and returned to predepletion levels (as low as
<100 copy Eq/ml) as circulating CD8+ cells were restored.
The extent of host control of replication of highly pathogenic SIV
strains and the level of resistance to heterologous rechallenge
achieved following transient postinoculation treatment compared
favorably to the results seen after SIVsmE660 and SIVmac239 challenge
with many vaccine strategies. This impressive control of viral
replication was observed despite comparatively modest measured immune
responses, less than those often achieved with vaccination regimens.
The results help establish the underlying feasibility of efforts to
develop vaccines for the prevention of AIDS, although the exact
nature of the protective host responses involved remains to be elucidated.
*
Corresponding author. Mailing address: Retroviral
Pathogenesis Laboratory, AIDS Vaccine Program, SAIC Frederick, National Cancer Institute at Frederick, Building 535, Fifth Floor,
Frederick, MD 21702. Phone: (301) 846-5019. Fax: (301) 846-5588. E-mail: lifson{at}avpaxpl.ncifcrf.gov.

Dedicated to the memory of our colleague Kalachar
Suryanarayana.
Journal of Virology, November 2001, p. 10187-10199, Vol. 75, No. 21
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.21.10187-10199.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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Voss, G., Manson, K., Montefiori, D., Watkins, D. I., Heeney, J., Wyand, M., Cohen, J., Bruck, C.
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