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M94A3245.TXT
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1994-10-25
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Document 3245
DOCN M94A3245
TI Identification of a complement activating site in gp120.
DT 9412
AU Susal C; Kirschfink M; Kropelin M; Daniel V; Opelz G; Institute of
Immunology, University of Heidelberg, Germany.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):12 (abstract no. 023A). Unique
Identifier : AIDSLINE ICA10/94369330
AB OBJECTIVE: We showed recently that rgp120 of HIV-1, either attached to
microtiter plates or bound to normal CD4+ cells, activates the human
complement system in the absence of anti-gp120 antibodies. This may
represent a mechanism for the elimination of uninfected CD4+ cells by
the reticuloendothelial system and play a role in the enhancement of
infection by HIV-1. In the current study we attempted to identify
complement activation sites in gp120. METHODS: Equal amounts of 21
different gp120-peptides were attached to microtiter plates. After
incubation with normal, anti-gp120 neg. human serum (n = 10) deposition
of complement proteins was assessed by ELISA. RESULTS: Complement
proteins C4, C3d, C5b-9 and properdin were found to bind to a peptide
covering positions 228-246 when incubated with any normal human serum.
Complement activation by the peptide was as strong as by aggregated IgG,
by complete rgp120, as well as by the previously described complement
activating gp41-peptide 609-623. Activation of complement occurred
primarily via the classical pathway and was abrogated in the presence of
EDTA, Mg/EGTA or C4-deficient human serum. Peptides partly overlapping
the sequence 228-246 activated complement to a lesser extent.
CONCLUSIONS: Our data indicate that a specific site in gp120 is able to
activate complement in normal human serum via the classical pathway in
the absence of anti-gp120 and independent of glycosylation.
DE Complement/ISOLATION & PURIF *Complement Activation Complement
Pathway, Classical Enzyme-Linked Immunosorbent Assay Human HIV
Envelope Protein gp120/*IMMUNOLOGY HIV Envelope Protein gp41/IMMUNOLOGY
HIV-1/*IMMUNOLOGY MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).