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1996-02-27
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Document 0623
DOCN M9630623
TI Limited viral spread and rapid immune response in lymph nodes of
macaques inoculated with attenuated simian immunodeficiency virus.
DT 9603
AU Chakrabarti L; Baptiste V; Khatissian E; Cumont MC; Aubertin AM;
Montagnier L; Hurtrel B; Unite d'Oncologie Virale, Institut Pasteur,
Paris, France.
SO Virology. 1995 Nov 10;213(2):535-48. Unique Identifier : AIDSLINE
MED/96074529
AB A comparative study was undertaken to characterize the very early events
that distinguish attenuated and pathogenic simian immunodeficiency virus
(SIV) infections. Three rhesus macaques were inoculated with the
attenuated SIVmac 251 delta nef virus, and three others with a virus of
intermediate phenotype, SIVmac 239 nef stop. They were compared to four
macaques inoculated with the pathogenic SIVmac 251 isolate. Lymph nodes
(LN) taken between 7 days and 2 months postinoculation were analyzed for
SIV expression by in situ hybridization. During acute infection, SIV 21
delta nef infected 1 to 1.5 log10 fewer cells in LN tissue than the
pathogenic SIV 251 isolate. The reduction was more marked in the blood,
as SIV 251 delta nef infected 2 to 3 log10 fewer PBMC than the isolate
and did not yield detectable antigenemia. Morphometric measurements
showed that the development of germinal centers (GC) was more rapid in
the delta nef infection, which led to a more efficient trapping of viral
particles, and could account for antigenemia clearance. The SIV 239 nef
stop clone reverted to a nef+ genotype at Week 2, but induced a lower
viral burden than a directly pathogenic virus. The kinetics of GC
development was rapid, indicating that SIV 239 nef stop induced an
immune response similar to that seen in attenuated infection. This study
provides evidence that attenuated SIV elicits a more rapid immune
response than pathogenic SIV and suggests that an early
immunosuppressive episode may facilitate the dissemination of pathogenic
SIV.
DE Amino Acid Sequence Animal Antibodies, Viral/BLOOD Base Sequence
Comparative Study Disease Progression DNA Primers DNA, Viral/ANALYSIS
Germinal Center/IMMUNOLOGY Kinetics Leukocytes, Mononuclear/VIROLOGY
Lymph Nodes/IMMUNOLOGY/*VIROLOGY Macaca mulatta Molecular Sequence
Data Simian Acquired Immunodeficiency Syndrome/IMMUNOLOGY/*VIROLOGY
Support, Non-U.S. Gov't SIV/IMMUNOLOGY/ISOLATION & PURIF/*PATHOGENICITY
Viremia Virulence JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).