The Journal of Experimental Medicine
Janeway's Immunobiology 7th Edition
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Published 21 June 2004. doi:10.1084/jem.20040432
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 199, Number 12, 1709-1718
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Cytotoxic T Lymphocyte–based Control of Simian Immunodeficiency Virus Replication in a Preclinical AIDS Vaccine Trial

Tetsuro Matano1,2, Masahiro Kobayashi1, Hiroko Igarashi1, Akiko Takeda1,2, Hiromi Nakamura2, Munehide Kano2, Chie Sugimoto2, Kazuyasu Mori2, Akihiro Iida3, Takahiro Hirata3, Mamoru Hasegawa3, Takae Yuasa4, Masaaki Miyazawa4, Yumiko Takahashi5, Michio Yasunami5, Akinori Kimura5, David H. O'Connor6, David I. Watkins6, and Yoshiyuki Nagai7

1 Department of Microbiology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
2 AIDS Research Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
3 DNAVEC Research Inc., Tsukuba 305-0856, Japan
4 Department of Immunology, Kinki University School of Medicine, Osaka 589-8511, Japan
5 Department of Molecular Pathogenesis, Division of Medical Science, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 101-0062, Japan
6 Wisconsin Primate Research Center and Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison, WI 53706
7 Toyama Institute of Health, Toyama 939-0363, Japan

Address correspondence to Tetsuro Matano, Department of Microbiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. Phone: 81-3-5841-3409; Fax: 81-3-5841-3374; email: matano{at}m.u-tokyo.ac.jp

Recently, encouraging AIDS vaccine trials in macaques have implicated cytotoxic T lymphocytes (CTLs) in the control of the simian human immunodeficiency virus SHIV89.6P that induces acute CD4+ T cell depletion. However, none of these vaccine regimens have been successful in the containment of replication of the pathogenic simian immunodeficiency viruses (SIVs) that induce chronic disease progression. Indeed, it has remained unclear if vaccine-induced CTL can control SIV replication. Here, we show evidence suggesting that vaccine-induced CTLs control SIVmac239 replication in rhesus macaques. Eight macaques vaccinated with DNA-prime/Gag-expressing Sendai virus vector boost were challenged intravenously with SIVmac239. Five of the vaccinees controlled viral replication and had undetectable plasma viremia after 5 wk of infection. CTLs from all of these five macaques rapidly selected for escape mutations in Gag, indicating that vaccine-induced CTLs successfully contained replication of the challenge virus. Interestingly, analysis of the escape variant selected in three vaccinees that share a major histocompatibility complex class I haplotype revealed that the escape variant virus was at a replicative disadvantage compared with SIVmac239. These findings suggested that the vaccine-induced CTLs had "crippled" the challenge virus. Our results indicate that vaccine induction of highly effective CTLs can result in the containment of replication of a highly pathogenic immunodeficiency virus.

Key Words: CD8+ T lymphocytes • selection • MHC • SIV • Sendai virus


Abbreviations used in this paper: aa, amino acid(s); B-LCL, B lymphoblastoid cell line; DGGE, denaturing gradient gel electrophoresis; L, leucine; nt, nucleotide; RSCA, reference strand–mediated conformation analysis; S, serine; SeV, Sendai virus; SHIV, simian HIV; SIV, simian immunodeficiency virus; VSV-G, vesicular stomatitis virus G; Vv, vaccinia virus.


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