home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Education
/
collectionofeducationcarat1997.iso
/
HEALTH
/
MED9602.ZIP
/
M9620389.TXT
< prev
next >
Wrap
Text File
|
1996-02-26
|
4KB
|
55 lines
Document 0389
DOCN M9620389
TI Persistent infection of macaques with simian-human immunodeficiency
viruses.
DT 9602
AU Li JT; Halloran M; Lord CI; Watson A; Ranchalis J; Fung M; Letvin NL;
Sodroski JG; Dana-Farber Cancer Institute, Department of Pathology,
Harvard; Medical School, Boston, Massachusetts, USA.
SO J Virol. 1995 Nov;69(11):7061-7. Unique Identifier : AIDSLINE
MED/96013809
AB Chimeric simian-human immunodeficiency viruses (SHIV) containing the
human immunodeficiency virus type 1 (HIV-1) tat, rev, env, and, in some
cases, vpu genes were inoculated into eight cynomolgus monkeys. Viruses
could be consistently recovered from the CD8-depleted peripheral blood
lymphocytes of all eight animals for at least 2 months. After this time,
virus isolation varied among the animals, with viruses continuing to be
isolated from some animals beyond 600 days after inoculation. The level
of viral RNA in plasma during acute infection and the frequency of virus
isolation after the initial 2-month period were higher for the
Vpu-positive viruses. All of the animals remained clinically healthy,
and the absolute numbers of CD4-positive lymphocytes were stable.
Antibodies capable of neutralizing HIV-1 were generated at high titers
in animals exhibiting the greatest consistency of virus isolation.
Strain-specific HIV-1-neutralizing antibodies were initially elicited,
and then more broadly neutralizing antibodies were elicited. env
sequences from two viruses isolated more than a year after infection
were analyzed. In the Vpu-negative SHIV, for which virus loads were
lower, a small amount of env variation, which did not correspond to that
found in natural HIV-1 variants, was observed. By contrast, in the
Vpu-positive virus, which was consistently isolated from the host
animal, extensive variation of the envelope glycoproteins in the defined
variable gp120 regions was observed. Escape from neutralization by CD4
binding site monoclonal antibodies was observed for the viruses with the
latter envelope glycoproteins, and the mechanism of escape appears to
involve decreased binding of the antibody to the monomeric gp120
glycoproteins. The consistency with which SHIV infection of cynomolgus
monkeys is initiated and the similarities in the neutralizing antibody
response to SHIV and HIV-1 support the utility of this model system for
the study of HIV-1 prophylaxis.
DE Acquired Immunodeficiency Syndrome/BLOOD/IMMUNOLOGY/*VIROLOGY Amino
Acid Sequence Animal Antibodies, Viral/BLOOD Antibody Formation Base
Sequence Chimera DNA Primers DNA, Viral/ANALYSIS Genes, env Genes,
rev Genes, tat Genes, vpu Human HIV/*GENETICS/ISOLATION &
PURIF/*PATHOGENICITY HIV Antibodies/BLOOD HIV Envelope Protein
gp120/IMMUNOLOGY Lymphocytes/*VIROLOGY Macaca fascicularis Molecular
Sequence Data Point Mutation Polymerase Chain Reaction RNA,
Viral/BLOOD Simian Acquired Immunodeficiency Syndrome/BLOOD/IMMUNOLOGY/
*VIROLOGY Support, Non-U.S. Gov't Support, U.S. Gov't, P.H.S.
SIV/*GENETICS/ISOLATION & PURIF/*PATHOGENICITY Time Factors Viral
Envelope Proteins/GENETICS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).