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M9640649.TXT
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1996-03-04
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Document 0649
DOCN M9640649
TI Humoral response to oligomeric human immunodeficiency virus type 1
envelope protein.
DT 9604
AU Richardson TM Jr; Stryjewski BL; Broder CC; Hoxie JA; Mascola JR; Earl
PL; Doms RW; Department of Pathology, University of Pennsylvania,
Philadelphia; 19104, USA.
SO J Virol. 1996 Feb;70(2):753-62. Unique Identifier : AIDSLINE
MED/96135183
AB The humoral immune response to human immunodeficiency virus type 1
(HIV-1) is often studied by using monomeric or denatured envelope
proteins (Env). However, native HIV-1 Env complexes that maintain
quaternary structure elicit immune responses that are qualitatively
distinct from those seen with monomeric or denatured Env. To more
accurately assess the levels and types of antibodies elicited by HIV-1
infection, we developed an antigen capture enzyme-linked immunosorbent
assay using a soluble, oligomeric form of HIV-1IIIB Env (gp140) that
contains gp120 and the gp41 ectodomain. The gp140, captured by various
monoclonal antibodies (MAbs), retained its native oligomeric structure:
it bound CD4 and was recognized by MAbs to conformational epitopes in
gp120 and gp41, including oligomer-specific epitopes in gp41. We
compared the reactivities of clade B and clade E serum samples to
captured Env preparations and found that while both reacted equally well
with oligomeric gp140, clade B seras reacted more strongly with
monomeric gp120 than did clade E samples. However, these differences
were minimized when gp120 was captured by a V3 loop MAb, which may lead
to increased exposure of the CD4 binding site. We also measured the
ability of serum samples to block binding of MAbs to epitopes in gp120
and gp41. Clade B serum samples consistently blocked binding of
oligomer-dependent MAbs to gp41 and, to a slightly lesser extent, MAbs
to the CD4 binding site in gp120. Clade E serum samples showed
equivalent or greater blocking of oligomer-dependent gp41 antibodies and
considerably less blocking of CD4-binding-site MAbs. Finally, we found
that < 5% of the antibodies in clade B sera bound to epitopes present
only in monomeric gp120, 30% bound to epitopes present in both monomeric
gp120 and oligomeric gp140, and 70% bound to epitopes present in
oligomeric gp140, which includes gp41. Thus, captured oligomeric Env
closely reflects the antigenic characteristics of Env protein on the
surface of virions and infected cells, retains highly conserved epitopes
that are recognized by antibodies raised against different clades, and
makes it possible to detect a much greater fraction of total anti-HIV-1
Env activity in sera than does native monomeric gp120.
DE Animal Antibodies, Monoclonal/IMMUNOLOGY Cell Line Cells, Cultured
Enzyme-Linked Immunosorbent Assay/*METHODS Gene Products,
env/*IMMUNOLOGY Human HIV Antibodies/BLOOD/*IMMUNOLOGY HIV
Antigens/*IMMUNOLOGY HIV Envelope Protein gp120/IMMUNOLOGY HIV
Envelope Protein gp41/IMMUNOLOGY HIV Seropositivity/BLOOD/IMMUNOLOGY
HIV-1/*IMMUNOLOGY/ISOLATION & PURIF Recombinant Fusion
Proteins/IMMUNOLOGY Support, U.S. Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).