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1996-02-26
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Document 1070
DOCN M9621070
TI Neutralization of primary HIV-1 isolates by anti-envelope monoclonal
antibodies.
DT 9602
AU D'Souza MP; Milman G; Bradac JA; McPhee D; Hanson CV; Hendry RM;
Division of AIDS, National Institute of Allergy and Infectious;
Diseases, National Institutes of Health, Bethesda, Maryland; 20892, USA.
SO AIDS. 1995 Aug;9(8):867-74. Unique Identifier : AIDSLINE MED/96014959
AB OBJECTIVE: To evaluate human monoclonal antibodies (MAb) for
neutralizing activity against primary HIV-1 isolates in peripheral blood
mononuclear cells. DESIGN: Neutralization activity data were obtained
from 11 laboratories on a coded panel consisting of six human MAb to HIV
envelope V3, CD4-binding region or gp41. Hyperimmune globulin against
HIV-1 and normal human immunoglobulin G were supplied as controls. Each
laboratory received pre-titered virus for use in the studies. METHODS:
Each laboratory measured neutralization of the MAb against laboratory
strain HIVMN, genomic clone HIVJR-CSF, two subtype B and one subtype D
primary isolates. RESULTS: The titers of the centrally supplied virus
stocks as determined by re-titration or back-titration varied among
laboratories and were generally 10-100-fold less than provided. The
neutralizing activity of each MAb varied by as much as a 1000-fold among
laboratories. These differences may result from varying sensitivity in
neutralization assay protocols and the differing susceptibility of
primary cells to infection with HIV-1. CONCLUSIONS: To consolidate the
data from multiple laboratories, the neutralization titers were compared
by classifying antibodies as neutralizing if the antibody concentration
for 50% virus inhibition was < or = 10 micrograms/ml. By this criterion,
the CD4-binding region and gp41 MAb neutralized all four subtype B
viruses and the subtype D isolate in a few of the laboratories. The V3
MAb neutralized only HIVMN and the closely related HIVJR-CSF viruses.
DE *Antibodies, Monoclonal Antigens, CD4/IMMUNOLOGY Comparative Study
Gene Products, env/*IMMUNOLOGY Human *HIV Antibodies HIV Envelope
Protein gp120/IMMUNOLOGY HIV Envelope Protein gp41/IMMUNOLOGY
HIV-1/CLASSIFICATION/*IMMUNOLOGY/ISOLATION & PURIF In Vitro
Leukocytes, Mononuclear/VIROLOGY Neutralization Tests Peptide
Fragments/IMMUNOLOGY Support, Non-U.S. Gov't 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).