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Journal of Virology, June 1999, p. 4640-4650, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Cross-Subtype Neutralizing Antibodies Induced in Baboons by a Subtype E gp120 Immunogen Based on an R5 Primary Human Immunodeficiency Virus Type 1 Envelope

Thomas C. VanCott,1,* John R. Mascola,2,3 Lawrence D. Loomis-Price,1 Faruk Sinangil,4 Naamah Zitomersky,1 John McNeil,2 Merlin L. Robb,2 Deborah L. Birx,2 and Susan Barnett4

Henry M. Jackson Foundation1 and Division of Retrovirology, Walter Reed Army Institute of Research,2 Rockville, Maryland 20850; Department of Infectious Diseases, Naval Medical Research Institute, Bethesda, Maryland 208923; and Chiron Corporation, Emeryville, California 946084

Received 28 December 1998/Accepted 1 March 1999

Global human immunodeficiency virus type 1 (HIV-1) diversity may require engineering vaccines to express antigens representing strains prevalent in the target population of vaccine testing. The majority (90%) of incident infections in Thailand are genetic subtype E, with a small percentage of subtype B infections in the intravenous drug user populations. We have evaluated and compared the binding and HIV-1 neutralizing properties of serum antibodies induced in baboons by CHO cell-expressed monomeric gp120 derived from a CCR5-using (R5) subtype E primary HIV-1CM235 or a CXCR4-using (X4) subtype B T-cell line-adapted (TCLA) HIV-1SF2 isolate. In contrast to the subtype-specific HIV-1 neutralizing antibodies induced with recombinant HIV-1SF2 gp120 (rgp120SF2), rgp120CM235 immunization induced antibodies capable of neutralizing both subtype E and subtype B TCLA HIV-1 isolates. However, neither immunogen induced antibodies capable of neutralizing primary HIV-1 isolates. Antibody induced by rgp120CM235 preferentially bound natively folded gp120 and retained strong cross-reactivity against multiple gp120 strains within subtype E as well as subtype B. In contrast, antibody responses to rgp120SF2 were directed predominantly to linear epitopes poorly exposed on native gp120 and had more limited cross-recognition of divergent gp120. Fine epitope mapping revealed differences in antibody specificities. While both rgp120CM235 and rgp120SF2 induced antibodies to regions within C1, V1/V2, V3, and C5, unique responses were induced by rgp120CM235 to multiple epitopes within C2 and by rgp120SF2 to multiple epitopes within C3, V4, and C4. These data demonstrate that strain and/or phenotypic differences of HIV-1 subunit gp120 immunogens can substantially alter antibody binding specificities and subsequent HIV-1 neutralizing capacity.

* Corresponding author. Mailing address: Henry M. Jackson Foundation, 13 Taft Ct., Suite 200, Rockville, MD 20850. Phone: (301) 762-0089. Fax: (301) 762-4177. E-mail address: tvancott{at}hiv.hjf.org.

Journal of Virology, June 1999, p. 4640-4650, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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