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. 1989 May;76(2):216–221.

Fine specificity of IgG subclass response to group antigens in HIV-1-infected patients.

P A Broliden 1, L Morfeldt-Månsson 1, J Rosen 1, M Jondal 1, B Wahren 1
PMCID: PMC1541818  PMID: 2503275

Abstract

There is an association between the clinical stage of HIV-1 infection and the presence of antibodies against viral gag proteins (p17 and p24). The IgG subclass (G1 and G3) pattern against these antigens was analysed in stable patients and HIV patients progressing to AIDS. Antibodies were analysed with whole viral or peptide ELISA (using sequentially overlapping peptides) and Western Blots. IgG1 was found to be the dominant anti-HIV-1 IgG subclass and IgG1 antibodies declined in progressing patients against all HIV antigens evaluated in Western blot, including p17, p24, p31, gp41, p64, gp120 and gp160. In contrast IgG3 antibodies, which were found to be predominantly directed against gag proteins, and which could be detected in almost all patients, remained in the circulation during disease progression. By peptide assays distinct immunogenic regions were found in p17 in contrast to more evenly distributed epitopes in p24. A decreased divergence of antibody reactivity to both p17 and p24 peptides in the group of patients who developed AIDS was seen. No reaction to any single gag epitope related to disease progression. The difference between IgG1 and IgG3 anti-gag antibodies in relation to clearance during disease progression may depend on different properties of immune complexes formed by these two IgG subclasses.

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