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| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C0237401 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C0332307 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C0229671 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C0003241 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C0231220 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C1550587 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C1514562 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C1883221 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C0439851 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C0439859 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C1552596 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C1883204 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C1947931 | lld:lifeskim |
| pubmed-article:8189527 | lifeskim:mentions | umls-concept:C1880389 | lld:lifeskim |
| pubmed-article:8189527 | pubmed:issue | 6 | lld:pubmed |
| pubmed-article:8189527 | pubmed:dateCreated | 1994-6-20 | lld:pubmed |
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| pubmed-article:8189527 | pubmed:abstractText | The present study was designed to determine the antibody specificity for the human immunodeficiency virus type 1 (HIV-1) V3 domains of infectious and noninfectious virions present in the serum of AIDS patients. To accomplish this, HIV-1 was isolated in the presence of autologous antibodies from the serum samples of six AIDS patients in HIV-1-negative donor peripheral blood mononuclear cells by short-term cultivation. The isolated virus, defined as the infectious cell-free virus (iCFV), was characterized by sequence analysis of the proviral DNA coding for the third hypervariable (V3) region of the external glycoprotein gp120. This was carried out by amplifying and cloning the V3 region. In all six cases studied, 20 randomly selected V3 clones derived from the proviral DNA of the iCFV, 20 clones from patient cell-free virus, and 20 clones from cell-integrated virus were sequenced to study the distribution and frequency of the intrapatient virus population. The number of major virus variants in the six patients ranged from three to nine. The various V3 sequences found in the AIDS patients showed the typical amino acid pattern of the syncytium-inducing and non-syncytium-inducing viral phenotypes characteristic for the late stage of infection. However, only one patient-specific iCFV variant was detected within the 20 V3 clones analyzed per virus isolation. For the six patients a total of 34 V3-loop variants, either iCFV or non-iCFV, was observed. All 34 V3-loop sequences were expressed as glutathione-S-transferase fusion proteins (V3-GST). The autologous antibody response to the V3-GST fusion proteins was studied by Western immunoblot analysis. A strong antibody response to almost all non-iCFV V3-GST proteins was found in the sera of the six patients. In contrast, the autologous antibody response to the six iCFV V3 loops was undetectable (in four patients) or very faint (in two patients) compared with that to the non-iCFV V3 loops. Five of the six iCFV loops showed positively charged amino acids at positions strongly associated with the syncytium-inducing phenotype. These findings suggest that our in vitro isolation system selects for virions which are not recognized by V3-specific antibodies and are infectious both in vitro and in vivo. | lld:pubmed |
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