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M94A3292.TXT
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1994-10-25
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Document 3292
DOCN M94A3292
TI A novel in vitro HIV property in pediatric isolates.
DT 9412
AU St. Clair M; Vavro CL; Pennington KN; Valentine M; McKinney RE;
Burroughs Wellcome Co., RTP NC 27709.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):11 (abstract no. 019A). Unique
Identifier : AIDSLINE ICA10/94369283
AB A novel in vitro virus property has been identified in virus isolated
from 5 of 28 pediatric patients with HIV disease. This new property
differs from the previously defined Syncytia Inducing(SI) and
Non-Syncytia Inducing (NSI) phenotypes in that the virus is able to
replicate in MT-2 cells without the cytopathogenic effects observed with
the SI phenotype. We have designated this property as NSI+. The 5
patients (10 months to 9 years old) had received Zidovudine (ZDV), DDI,
or ZDV + DDI for various lengths of time and have relatively stable HIV
disease. Three patients received virus by vertical transmission, 2 by
transfusion soon after birth from a single donor. All patients had
stable CD4+ lymphocyte percentages until just prior to the emergence of
the new virus behavior when CD4+ counts abruptly decreased and then
recovered to baseline values. Patient peripheral blood lymphocytes
(PBL's) were cocultured with donor PBL's. Cultures were frozen at peak
reverse transcriptase(RT) levels. Positive PBL cultures were cocultured
with MT-2 cells to determine the virus phenotype (SI vs. NSI). These 5
patients had cocultures which demonstrated replication in MT-2 cells
without the formation of syncytia (were NSI+). While NSI+ virus
replicated in MT-2 cells to a titer (as determined by RT) ten-fold lower
than that produced by SI virus, NSI+ replicated to a level 50-fold above
background. In contrast, the typical NSI phenotype is incapable of
replicating to significant titers in MT-2 cells. Further passage of NSI+
in MT-2 cells did not result in a change of phenotype from NSI+ to SI.
Extensive mixing experiments of the 3 viral phenotypes has shown that
NSI+ is not a small SI contamination in an NSI background. Further
investigation of NSI+, including antibody neutralization studies and
genetic analysis of the envelope region of HIV, may elucidate its
significance in HIV disease.
DE Cells, Cultured Child Child, Preschool Human
HIV/CLASSIFICATION/GROWTH & DEVELOPMENT/*GENETICS HIV
Infections/*MICROBIOLOGY Infant Lymphocytes Phenotype T4 Lymphocytes
Virus Replication MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).