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1996-03-04
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Document 0779
DOCN M9640779
TI Detection of T cell CD4 epitopes in HIV-infected individuals.
DT 9604
AU Kunkl A; Valle MT; Fenoglio D; Dodi F; Morandi N; Rizzo F; Manca F;
Department of Immunology, San Martino Hospital, Genoa, Italy.
SO Eur J Histochem. 1994;38 Suppl 1:41-6. Unique Identifier : AIDSLINE
MED/96120978
AB HIV antigens can be detected in the circulation of HIV-infected patients
and are associated with active virus production. Free virions and
shedded gp120 bind CD4 with high affinity. We have studied the
expression of Leu3a and OKT4 epitopes on a CD4+ T cell line (HPB-ALL),
pretreated with HIV rgp120, and on CD4+ pheripheral blood T lymphocytes
of HIV-infected patients. The associated determination of these epitopes
(the Leu3a mapping at the gp120 binding site of CD4 and the OKT4 mapping
at a site independent of gp120 binding) allowed to monitor binding of
gp120 to surface CD4 and maintenance of CD4 expression. The comparison
of MFI of gp120-treated versus untreated Leu3a+ HPB-ALL cells suggested
that the Leu3a epitope was masked by treatment with 20 micrograms/ml
rgp120, while with 1 microgram/ml rgp120 masking was undetectable,
although gp120 was bound to cells. The determination of the Leu3a and
OKT4 epitopes in 105 HIV-infected individuals and in 50 normal controls,
showed that the Leu3a epitope is detected equally well in HIV-infected
and in normal subjects, provided the anti-Leu3a is used at saturation.
Therefore the binding to epitopes distinct from the gp120-binding site
does not seem to be a requisite for the selection of anti-CD4 mAbs for
immunophenotyping. To optimize the detection of CD4 masking, a limiting
amount of conjugated anti-Leu3a has to be used. Measurements of CD4
binding by gp120 in terms of gp120-free CD4 molecules, as detected by
reactivity with anti-Leu3a, may be used to monitor disease progression
in HIV-infected subjects.
DE Acquired Immunodeficiency Syndrome/IMMUNOLOGY Antibodies,
Monoclonal/DIAGNOSTIC USE/IMMUNOLOGY AIDS-Related Complex/IMMUNOLOGY
Binding Sites, Antibody Cell Line CD4-Positive
T-Lymphocytes/*IMMUNOLOGY Disease Progression Epitopes/IMMUNOLOGY
Human HIV Envelope Protein gp120/IMMUNOLOGY HIV Infections/*IMMUNOLOGY
Immunophenotyping 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).