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M9620388.TXT
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Document 0388
DOCN M9620388
TI Syncytium induction in primary CD4+ T-cell lines from normal donors by
human immunodeficiency virus type 1 isolates with non-syncytium-inducing
genotype and phenotype in MT-2 cells.
DT 9602
AU Todd BJ; Kedar P; Pope JH; Sir Albert Sakzewski Virus Research Centre,
Royal Children's; Hospital, Brisbane, Queensland, Australia.
SO J Virol. 1995 Nov;69(11):7099-105. Unique Identifier : AIDSLINE
MED/96013812
AB Human immunodeficiency virus type 1 (HIV-1) isolates classified as
syncytium-inducing (SI) or non-SI (NSI) in the MT-2 T-cell line exhibit
characteristic sequence differences in the V1-V2 and V3 regions of the
env gene. Seven HIV-1 isolates were phenotyped as NSI or SI in the MT-2
cell line. Unexpectedly, all four NSI viruses induced large syncytia 4
to 8 days postinoculation in a panel of five primary CD4+ T-cell lines
(including two clones) generated from the peripheral blood of normal
donors by exposure to infectious HIV-1, inactivated HIV-1, or
Epstein-Barr virus. The primary T-cell lines yielded neither HIV-1
provirus nor infectious HIV by PCR analysis or exhaustive coculture with
phytohemagglutinin-treated blast cells. Three isolates (TC354, PK1, and
PK2) were biologically cloned and retained their SI or NSI phenotypes in
MT-2 and primary T-cell lines. The biologically cloned provirus DNA was
also used to clone and sequence the relevant V2 and V3 regions of the
env genes. The amino acid sequences of the V2 and V3 regions were
characteristic of patterns already reported for the NSI, switch NSI, and
SI phenotypes, respectively. This evidence precludes the possibility
that these results were due to contamination of the NSI isolates with SI
virus. The results unequivocally indicate that HIV-1 isolates with the
NSI genotype and phenotype in MT-2 cells may actively induce syncytia in
cloned CD4+ T cells in vitro and support the view that direct cytopathic
effects may contribute to the steady decline in CD4+ T cells in
asymptomatic HIV-1-seropositive patients without detectable SI virus.
DE Amino Acid Sequence Cell Line Coculture Comparative Study Consensus
Sequence CD4-Positive T-Lymphocytes/*VIROLOGY Flow Cytometry Genotype
*Giant Cells/CYTOLOGY/VIROLOGY Herpesvirus 4, Human/PATHOGENICITY
Human HIV Envelope Protein gp120/CHEMISTRY/ISOLATION & PURIF HIV
Seronegativity/IMMUNOLOGY HIV Seropositivity/IMMUNOLOGY/VIROLOGY
HIV-1/GENETICS/ISOLATION & PURIF/*PHYSIOLOGY Immunophenotyping
Kinetics Molecular Sequence Data Phenotype Polymerase Chain Reaction
Reference Values Support, Non-U.S. Gov't *Virus Replication JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).