Abstract
The fine specificities of antibodies produced against human immunodeficiency virus type 1 (HIV-1) gp160 were examined in sera from 23 HIV-1-infected chimpanzees. These animals had been infected with one of six isolates of HIV-1. Sera were screened by enzyme-linked immunosorbent assay for reactivity against seven synthetic peptides corresponding to regions of gp160. Chimpanzees appear to remain healthy after infection with HIV-1, suggesting that these animals may prevent extensive spread of the virus in vivo through immunologic mechanisms. Antibody specificity to gp160 epitopes may play a key role in the defense against HIV-1-related disease. Approximately one-half of all chimpanzee sera contained antibodies reactive with peptide 846-860, which corresponds to the carboxyl terminus of gp41. Less than 10% of sera from HIV-1-infected humans that were examined contained antibodies reactive with peptide 846-860, suggesting that this region is not highly immunogenic in humans. Of the human sera containing antibodies reactive with this peptide, all were from individuals classified as Walter Reed stages 1 to 3. No sera from humans with advanced stages of the disease contained antibodies reactive with peptide 846-860. Peptide 600-611, which reportedly reacts with nearly all sera from HIV-infected humans, was reactive with less than one-half of sera from HIV-1-infected chimpanzees. The observed differences in antibody reactivity to gp160 peptides in sera from HIV-1-infected chimpanzees and humans suggest that each may generate antibodies against differing sets of HIV-1 epitopes. These differences may contribute to the lack of disease progression in chimpanzees after infection with HIV-1.
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Selected References
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