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M94A0348.TXT
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1994-10-08
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Document 0348
DOCN M94A0348
TI Blood monocytes infected in vivo by HIV-1 variants with a
syncytium-inducing phenotype.
DT 9412
AU Innocenti-Francillard P; Brengel K; Guillon C; Mallet F; Morand P;
Gruters R; Seigneurin JM; Department of Virology, Faculty of Medicine,
Grenoble, France.
SO AIDS Res Hum Retroviruses. 1994 Jun;10(6):683-90. Unique Identifier :
AIDSLINE MED/94355113
AB Extensive data have been obtained on sequence changes in the V3 region
of the HIV-1 envelope protein that are associated with in vitro
biological properties such as cell tropism and syncytium-inducing
capacity. However, so far this concerned viruses isolated from
peripheral blood mononuclear cells and thus did not discriminate between
variants present in T lymphocytes or in monocytes. In this study, we
analyzed viral sequences derived separately from uncultured T
lymphocytes, blood monocytes, and plasma of an HIV-1-infected patient
showing a neurological evolution of the disease. Sequences related to
the V3 region and 18 amino acids downstream were obtained from 48 clones
after PCR amplification. One predominant viral sequence close to the
monocytotropic/non-syncytium-inducing (NSI) consensus sequence was
observed in the three blood sources. Two viral species were specifically
identified in monocytes (43% of the clones), showing clear differences
from the consensus sequence and exhibiting the genetic determinants
associated with the SI phenotype. Plasma-derived viruses with a similar
V3 loop were obtained on in vitro isolation. Analysis of the biological
properties of these selected viruses confirmed their monocytotropism and
the syncytium-inducing phenotype as expected by the cell type in which
the sequences were observed and the charge of the V3 loop. Structural
analysis of these variants suggested an intermediate structure between
NSI/monocytotropic and SI/lymphotropic V3 loops. Thus, in vivo
circulating monocytes could be a reservoir for distinct HIV-1 variants
with potential SI characteristics, at least in later stages of
infection. Studying such variants over the course of the infection may
shed light on their involvement in disease manifestations.
DE Amino Acid Sequence Base Sequence Case Report DNA Probes Human HIV
Envelope Protein gp120/*GENETICS HIV Infections/*BLOOD HIV-1/*GENETICS
Male Molecular Sequence Data Monocytes/*MICROBIOLOGY Polymerase Chain
Reaction Support, Non-U.S. Gov't T-Lymphocytes/*MICROBIOLOGY JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).