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M9621041.TXT
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1996-02-26
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Document 1041
DOCN M9621041
TI Expression and characterization of CD4-IgG2, a novel heterotetramer that
neutralizes primary HIV type 1 isolates.
DT 9602
AU Allaway GP; Davis-Bruno KL; Beaudry GA; Garcia EB; Wong EL; Ryder AM;
Hasel KW; Gauduin MC; Koup RA; McDougal JS; et al; Progenics
Pharmaceuticals, Inc., Tarrytown, New York 10591, USA.
SO AIDS Res Hum Retroviruses. 1995 May;11(5):533-9. Unique Identifier :
AIDSLINE MED/96093887
AB CD4-IgG2 is a novel fusion protein comprising human IgG2 in which the Fv
portions of both heavy and light chains have been replaced by the V1 and
V2 domains of human CD4. This tetrameric protein is being developed as
an immunoprophylactic agent to reduce the probability of infection
following HIV-1 exposure, in settings such as occupational or perinatal
exposure to the virus. CD4-IgG2 has been expressed in Chinese hamster
ovary cells and is secreted as a fully assembled heterotetramer. The
protein binds with nanomolar affinity to purified gp120 from both a
laboratory-adapted strain and a primary isolate of HIV-1.
Pharmacokinetic studies in rabbits demonstrated that CD4-IgG2 has a
plasma terminal half-life greater than 1 day, compared with 15 min for
soluble CD4 (sCD4). CD4-IgG2 does not bind to Fc receptors on the
surface of U937 monocyte/macrophage cells. Compared to molecules that
incorporate the Fc portion of IgG1, CD4-IgG2 has less potential to
mediate functions such as antibody-dependent enhancement of infection or
transplacental transmission of HIV-1. When tested in a virus-free HIV-1
envelope glycoprotein-mediated cell fusion assay, the tetrameric
CD4-IgG2 molecule inhibited syncytium formation more effectively than
monomeric sCD4 or a dimeric CD4-gamma 2 fusion protein. This suggests
the protein will block cell-to-cell transmission of HIV-1. Moreover,
CD4-IgG2 effectively neutralized a panel of laboratory-adapted strains
and primary isolates of HIV-1, including strains with different tropisms
and isolated from different stages of the disease, at concentrations
that should be readily achieved in vivo.
DE Animal Antiviral Agents/*PHARMACOLOGY/PHARMACOKINETICS CD4
Immunoadhesins/*PHARMACOLOGY CHO Cells Giant Cells/VIROLOGY Hamsters
Human HIV Infections/*PREVENTION & CONTROL HIV-1/*DRUG EFFECTS
Neutralization Tests Rabbits Recombinant Fusion
Proteins/GENETICS/PHARMACOLOGY/ PHARMACOKINETICS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).