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Journal of Virology, May 2001, p. 4023-4028, Vol. 75, No. 9
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.9.4023-4028.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Quintuple Deglycosylation Mutant of Simian Immunodeficiency Virus SIVmac239 in Rhesus Macaques: Robust Primary Replication, Tightly Contained Chronic Infection, and Elicitation of Potent Immunity against the Parental Wild-Type Strain

Kazuyasu Mori,1,2 Yasuhiro Yasutomi,3 Shinji Ohgimoto,4 Tadashi Nakasone,1 Shiki Takamura,3 Tatsuo Shioda,5 and Yoshiyuki Nagai1,*

AIDS Research Center, National Institute of Infectious Diseases, Tokyo 162-8640,1 Tsukuba Primate Center for Medical Sciences, National Institute of Infectious Diseases, Tsukuba 305-0843,2 Department of Bioregulation, Mie University School of Medicine, Tsu 514-8507,3 and Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871,5 Japan, and Institut für Virologie und Immunbiologie, Universität Würzburg, Würzburg D-97078, Germany4

Received 7 December 2000/Accepted 25 January 2001

We previously generated a mutant of simian immunodeficiency virus (SIV) lacking 5 of a total of 22 N-glycans in its external envelope protein gp120 with no impairment in viral replication capability and infectivity in tissue culture cells. Here, we infected rhesus macaques with this mutant and found that it also replicated robustly in the acute phase but was tightly, though not completely, contained in the chronic phase. Thus, a critical requirement for the N-glycans for the full extent of chronic infection was demonstrated. No evidence indicating reversion to a wild type was obtained during the observation period of more than 40 weeks. Monkeys infected with the mutant were found to tolerate a challenge infection with wild-type SIV very well. Analyses of host responses following challenge revealed no neutralizing antibodies against the challenge virus but strong secondary responses of cytotoxic T lymphocytes against multiple antigens, including Gag-Pol, Nef, and Env. Thus, the quintuple deglycosylation mutant appeared to represent a novel class of SIV live attenuated vaccine.

* Corresponding author. Mailing address: AIDS Research Center, National Institute of Infectious Diseases, Toyama 1-23-1, Shinjuku-ku, Tokyo 162-8640, Japan. Phone: 81-3-5285-1111. Fax: 81-3-5285-1165. E-mail: ynagai{at}nih.go.jp.

Journal of Virology, May 2001, p. 4023-4028, Vol. 75, No. 9
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.9.4023-4028.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.