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M94A1925.TXT
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1994-10-24
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Document 1925
DOCN M94A1925
TI HIV-1 strain specific B-cell response to V3 loop disappears from early
to late stages of infection.
DT 9412
AU Schreiber M; Wachsmuth C; Muller H; von Lunzen J; Schmitz H; Bernhard
Nocht Inst. f. Tropical Medicine, Hamburg, FRG.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):42 (abstract no. 142A). Unique
Identifier : AIDSLINE ICA10/94370650
AB OBJECTIVE: The high variability of HIV-1 V3 leads to escape mutants
which are not recognized by the patients autologous antibodies. We were
therefore interested in examining the B cell response to V3 loop
variants at different times during HIV infection. METHODS: For each
patient the different V3 variants were analyzed by sequencing. The in
vivo infectious cell-free virus (iCFV) which escapes the neutralizing
activity was characterized by an autologous Serum-PBMC neutralization
assay. Recombinant V3 loop glutathione S-transferase fusion proteins
were tested with the patient sera using ELISA. RESULTS: For each patient
the V3 loop of the iCFV escape mutant was tested in comparison with the
patient specific non-iCFV V3 loop using autologous sera from
asymptomatic through to symptomatic stages. We found that iCFV V3
variants escaping neutralization at late stages were well recognized by
patient antibodies years before. Surprisingly the titers decreased
continuously over years and by the time the V3 variant was characterized
as infectious virus no anti-iCFV V3 loop antibody could be detected.
CONCLUSION: The data shows that the HIV B-cell response to later
appearing V3 variants is present in the early stage of the disease. The
B-cell response continuously decreases in an unknown but highly V3
specific manner during the progression of the disease.
DE *Amino Acid Sequence B-Lymphocytes/*IMMUNOLOGY Enzyme-Linked
Immunosorbent Assay Human HIV-1/*GENETICS/IMMUNOLOGY Neutralization
Tests Recombinant Fusion Proteins/ANALYSIS MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).