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M9620381.TXT
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1996-02-26
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Document 0381
DOCN M9620381
TI Selective infection of human T-lymphotropic virus type 1
(HTLV-1)-infected cells by chimeric human immunodeficiency viruses
containing HTLV-1 tax response elements in the long terminal repeat.
DT 9602
AU Lin HC; Bodkin M; Lal RB; Rabson AB; Department of Molecular Genetics
and Microbiology, Robert Wood; Johnson Medical School, University of
Medicine and Dentistry of; New Jersey, Piscataway, USA.
SO J Virol. 1995 Nov;69(11):7216-25. Unique Identifier : AIDSLINE
MED/96013826
AB Previous studies have suggested that the human immunodeficiency virus
long terminal repeat (HIV LTR) enhancer/promoter sequences contribute to
the replication ability of HIV in different T-cell lines; mutation of
these sequences can alter HIV tropism. We have utilized site-specific
mutagenesis to generate variants of HIV that exhibit specific tropism
for human T-lymphotropic virus type 1 (HTLV-1) Tax-expressing CD4+ T
cells. The wild-type HIV LTR NF-kappa B and Sp1 sites in an infectious
molecular clone of HIV type 1 were replaced with sequences derived from
the 21-bp Tax response elements (TRE) from the HTLV-1 LTR to generate
TRE-containing chimeric HIVs (TRE-HIVs). The TRE-HIVs exhibit selective
replication and cell killing in HTLV-infected human CD4+ T cells, but
not in HTLV-negative T cells. Transient transfections suggested that
Tax-TRE interactions could account for the observed replication
specificity. The TRE-containing HIV LTRs were synergistically activated
by the HIV Tat and HTLV-1 Tax transactivators. These results demonstrate
that it is possible to specifically target HIV replication and
cytotoxicity to HTLV-1+, CD4+ human T cells, on the basis of Tax-TRE
interactions, and provide a model for the development of specific,
cytotoxic, retroviral gene therapy vectors for HTLV-1-infected cells
based on alterations of the LTR transcriptional regulatory elements.
They also suggest that HIV Tat can cooperate with heterologous
transcriptional activators, such as Tax, which act through upstream
binding sites without directly binding to DNA.
DE Base Sequence Cell Line Cell Survival Chimera Chloramphenicol
Acetyltransferase/BIOSYNTHESIS CD4-Positive T-Lymphocytes Gene
Products, tat/BIOSYNTHESIS/*METABOLISM Gene Products,
tax/BIOSYNTHESIS/GENETICS/*METABOLISM Human HIV/GENETICS/*PHYSIOLOGY
*HIV Long Terminal Repeat HTLV-I/*GENETICS/*PHYSIOLOGY Kinetics
Molecular Sequence Data Plasmids Recombinant Fusion
Proteins/BIOSYNTHESIS *Regulatory Sequences, Nucleic Acid *Repetitive
Sequences, Nucleic Acid Restriction Mapping Support, Non-U.S. Gov't
Support, U.S. Gov't, P.H.S. Transfection *Virus Replication JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).