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1996-02-26
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Document 0819
DOCN M9620819
TI Block of HIV-1 infection by a combination of antisense tat RNA and TAR
decoys: a strategy for control of HIV-1.
DT 9602
AU Chang HK; Gendelman R; Lisziewicz J; Gallo RC; Ensoli B; Laboratory of
Tumor Cell Biology, National Cancer Institute,; National Institutes of
Health, Bethesda, MD 20892, USA.
SO Gene Ther. 1994 May;1(3):208-16. Unique Identifier : AIDSLINE
MED/96050942
AB The tat gene product (Tat) of HIV-1 is an early regulatory protein
necessary for viral gene expression and replication. Tat may also play a
role as an extracellular protein in both HIV-1 replication and
AIDS-associated disorders such as Kaposi's sarcoma. Thus, Tat represents
a good target for gene therapy against AIDS. Here we show that when
vectors expressing antisense tat RNA are transiently transfected into
CD4+ cells, they block about 70% of HIV-1 replication and inhibit the
rescue of Tat-defective HIV-1 proviruses by inhibition of Tat protein
expression and consequent lack of transcriptional activation of the
HIV-promoter. However, antisense tat vectors cannot block the activity
of extracellular Tat protein. Another tat inhibitory construct
(poly-Tat-activation response; TAR) previously suggested to inhibit
HIV-1 transactivation by sequestering the Tat protein, inhibited the
activity of extracellular Tat, but like antisense tat RNA did not
completely block viral gene expression and replication. These results
suggested that one mode of inhibition is not sufficient to block Tat
function. However, when the antisense tat and the poly-TAR constructs
were combined HIV-1 gene expression was completely blocked (94-98%),
suggesting that a combination of inhibitory genes blocking Tat by
sequential steps may be a better approach for AIDS gene therapy.
DE Acquired Immunodeficiency Syndrome/THERAPY Antisense Elements
(Genetics)/GENETICS Base Sequence Cell Line CD4-Positive
T-Lymphocytes/VIROLOGY Gene Expression/DRUG EFFECTS Gene Therapy
*Genes, tat Hela Cells Human HIV Infections/*PREVENTION &
CONTROL/VIROLOGY *HIV-1/DRUG EFFECTS/GENETICS/PHYSIOLOGY Molecular
Sequence Data Plasmids/GENETICS RNA, Antisense/GENETICS/*PHARMACOLOGY
Transfection Virus Replication/DRUG EFFECTS/GENETICS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).