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1994-10-25
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Document 3226
DOCN M94A3226
TI Primary infection in lymph nodes of macaques inoculated with pathogenic
and attenuated SIV.
DT 9412
AU Chakrabarti L; Cumont MC; Baptiste V; Khatissian E; Montagnier L;
Hurtrel B; Unite d'Oncologie Virale, Institut Pasteur, Paris, France.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):124 (abstract no. PA0116). Unique
Identifier : AIDSLINE ICA10/94369349
AB Our purpose was to characterize the very early events that distinguish
pathogenic and attenuated SIVmac infections. Using in situ
hybridization, we determined the kinetics of viral spread in lymph nodes
(LN) obtained sequentially during the primary stage of infection. 4
Rhesus macaques were inoculated intravenously with a high dose of the
pathogenic isolate SIVmac 251. 4 macaques received a low dose (10 AID50)
of the same isolate. 3 macaques received a high dose of an attenuated
virus derived from the SIVmac 251 BK28 clone with a deletion in the nef
gene (251 delta nef). 3 macaques received a high dose of the virus
derived from the SIVmac 239 clone with a stop codon in the nef gene (239
nef stop). For each animal, 4 axillary or inguinal LN were taken
sequentially between 7 days and 2 month post-inoculation (p.i.). Primary
LN infection with the pathogenic SIVmac 251 consisted in 2 phases, with
a massive viral replication in lymphocytes and macrophages, followed by
an accumulation of viral particles in the germinal centers. The same
phases were observed with attenuated SIV, though the number of
productively infected cells was reduced by a factor 2 to 10. The 239 nef
stop virus persisted at higher levels in LN than the 251 delta nef
virus, probably because of a rapid reversion of the stop codon in the
nef gene. Interestingly, germinal center differentiation occurred
earlier in animals infected with attenuated viruses, pointing to
differences in the development of the humoral response.
DE Animal Comparative Study Gene Deletion Genes, nef In Situ
Hybridization Lymph Nodes/*MICROBIOLOGY Lymphocytes/MICROBIOLOGY
Macaca mulatta Macrophages/MICROBIOLOGY Simian Acquired
Immunodeficiency Syndrome/MICROBIOLOGY/*PATHOLOGY SIV/*ISOLATION &
PURIF/PHYSIOLOGY/PATHOGENICITY Virus Replication MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).