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M9490084.TXT
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1994-09-03
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Document 0084
DOCN M9490084
TI The majority of neutralizing Abs in HIV-1-infected patients recognize
linear V3 loop sequences. Studies using HIV-1MN multiple antigenic
peptides.
DT 9411
AU Vogel T; Kurth R; Norley S; Paul Ehrlich Institute, Langen, Germany.
SO J Immunol. 1994 Aug 15;153(4):1895-904. Unique Identifier : AIDSLINE
MED/94321799
AB Multiple antigenic peptides (MAP) comprising eight synthetic peptides
corresponding to the V3 loop of HIV-1MN or HIV-1IIIB linked to a lysine
core were used to characterize the humoral Ab response of HIV-1-infected
patients against this domain. One hundred percent of the tested sera
from HIV-1-infected European patients reacted significantly with the
HIV-1MN V3 loop MAP. Most, but not all, sera also reacted against the
HIV-1IIIB V3 loop MAP, albeit with low titers. The in vitro
neutralization capacity of the patients' sera against HIV-1MN or
HIV-1IIIB infection were tested. All sera showed significant
neutralizing titers against HIV-1MN, in comparison with the low (when
detectable) neutralizing titers against HIV-1IIIB. Competition assays
revealed that the majority of HIV-1MN-neutralizing Abs in patients' sera
react with the V3 loop peptides. Only a small fraction of the total
neutralizing capacity, presumably specific for other neutralizing
epitopes, could not be adsorbed with HIV-1MN V3 loop peptides. The V3
loop peptides could also compete for the binding of Abs in patients'
sera mediating Ab-dependent cellular cytotoxicity (ADCC) of HIV-1MN
infected cells, inhibiting 30 to 80% of the ADCC activity. Finally, the
HIV-1MN V3 loop MAP, when used as immunogen in the presence of RIBI
adjuvant without a carrier protein, elicited Abs able to neutralize
HIV-1MN (but not HIV-1IIIB) and to initiate ADCC of HIV-1MN-infected
cells. This neutralizing and ADCC activity, mediated by V3MN-specific
rabbit Abs, could be totally absorbed by V3MN loop peptides.
DE Amino Acid Sequence Antibody Specificity Antibody-Dependent Cell
Cytotoxicity/IMMUNOLOGY Antigenic Determinants Human HIV
Antibodies/*IMMUNOLOGY HIV Envelope Protein gp120/*IMMUNOLOGY HIV
Infections/*IMMUNOLOGY HIV-1/*IMMUNOLOGY Molecular Sequence Data
Neutralization Tests Peptide Fragments/*IMMUNOLOGY
Peptides/CHEMISTRY/IMMUNOLOGY Support, Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).