title: Analysis of antibody specificity against the third variable region of the envelope glycoprotein gp120 of HIV-1 in plasma from HIV-1-positive individuals residing in Brazil.
abstract: 1. Antibody specificity for the principal neutralization domain (PND) of the human immunodeficiency virus type 1 (HIV-1) was studied in plasma from 122 HIV-1-infected individuals residing in Brazil. 2. Using 8 overlapping sequential pentadecapeptides corresponding to the third variable region (V3) of 5 different HIV-1 isolates in an enzyme-linked immunosorbent assay (ELISA), a preferential recognition of the peptides with amino acid sequences corresponding to the HIV-1 isolates IIIB and MN (maximal reactivities of 60-70%) compared to the isolates SC, WMJ-2 or RF (maximal reactivities below 60%) was observed. 3. A difference was observed in the overall reactivity pattern to HIV-1 SC peptides of plasma collected from individuals residing in the Brazilian states of Rio de Janeiro and Bahia. However, a statistically significant increased recognition by Bahian plasma was only observed for the HIV-1 SC C55 peptide. 4. The mean CD4/CD8 ratio of the group of plasma with an isolate-restricted recognition of peptides (0.522 +/- 0.074) was significantly lower than that of the total group of plasma (1.00 +/- 0.18).
authors.affiliation: Departamento de Imunologia, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brasil.
authors.forename: V
authors.initials: V
authors.lastname: Bongertz
authors.forename: M
authors.initials: M
authors.lastname: Jansson
authors.forename: P
authors.initials: P
authors.lastname: Flodby
authors.forename: M G
authors.initials: MG
authors.lastname: Morgado
authors.forename: B
authors.initials: B
authors.lastname: Galvão-Castro
authors.forename: H
authors.initials: H
authors.lastname: Wigzell
mesh_terms: D000595:Amino Acid Sequence; D000918:Antibody Specificity / Q000276:immunology*; D000937:Antigen-Antibody Reactions; D001938:Brazil; D016516:CD4-CD8 Ratio; D004797:Enzyme-Linked Immunosorbent Assay; D015699:HIV Envelope Protein gp120 / Q000276:immunology*; D015497:HIV-1 / Q000276:immunology*; D006801:Humans; D007135:Immunoglobulin Variable Region / Q000276:immunology*; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000276:immunology
chemical_list: D015699:HIV Envelope Protein gp120; D007135:Immunoglobulin Variable Region; D010446:Peptide Fragments