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M9651056.TXT
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1996-03-30
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Document 1056
DOCN M9651056
TI T30177, an oligonucleotide stabilized by an intramolecular guanosine
octet, is a potent inhibitor of laboratory strains and clinical isolates
of human immunodeficiency virus type 1.
DT 9505
AU Ojwang JO; Buckheit RW; Pommier Y; Mazumder A; De Vreese K; Este JA;
Reymen D; Pallansch LA; Lackman-Smith C; Wallace TL; et al; Triplex
Pharmaceutical Corporation, The Woodlands, Texas 77380,; USA.
SO Antimicrob Agents Chemother. 1995 Nov;39(11):2426-35. Unique Identifier
: AIDSLINE MED/96139534
AB T30177, an oligonucleotide composed of only deoxyguanosine and
thymidine, is 17 nucleotides in length and contains single
phosphorothioate internucleoside linkages at its 5' and 3' ends for
stability. This oligonucleotide does not share significant primary
sequence homology with or possess any complementary (antisense) sequence
motifs to the human immunodeficiency virus type 1 (HIV-1) genome. T30177
inhibited replication of multiple laboratory strains of HIV-1 in human
T-cell lines, peripheral blood lymphocytes, and macrophages. T30177 was
also found to be capable of inhibiting multiple clinical isolates of
HIV-1 and preventing the cytopathic effect of HIV-1 in primary CD4+ T
lymphocytes. In assays with human peripheral blood lymphocytes there was
no observable toxicity associated with T30177 at the highest
concentration tested (100 microM), while the median inhibitory
concentration was determined to be in the range of 0.1 to 1.0 microM for
the clinical isolates tested, resulting in a high therapeutic index for
this drug. In temporal studies, the kinetics of addition of T30177 to
infected cell cultures indicated that, like the known viral adsorption
blocking agents dextran sulfate and Chicago sky blue, T30177 needed to
be added to cells during or very soon after viral infection. However,
analysis of nucleic acids extracted at 12 h postinfection from cells
treated with T30177 at the time of virus infection established the
presence of unintegrated viral cDNA, including circular proviral DNA, in
the treated cells. In vitro analysis of viral enzymes revealed that
T30177 was a potent inhibitor of HIV-1 integrase, reducing enzymatic
activity by 50% at concentrations in the range of 0.050 to 0.09 microM.
T30177 was also able to inhibit viral reverse transcriptase activity;
however, the 50% inhibitory value obtained was in the range of 1 to 10
microM, depending on the template used in the enzymatic assay. No
observable inhibition of viral protease was detected at the highest
concentration of T30177 used (10 microM). In experiments in which T30177
was removed from infected cell cultures at 4 days post-HIV-1 infection,
total suppression of virus production was observed for more than 27
days. PCR analysis of DNA extracted from cells treated in this fashion
was unable to detect the presence of viral DNA 11 days after removal of
the drug from the infected cell cultures. The ability of T30177 to
inhibit both laboratory and clinical isolates of HIV-1 and the
experimental data which suggest that T30177 represents a novel class of
integrase inhibitors indicate that this compound is a viable candidate
for evaluation as a therapeutic agent against HIV-1 in humans.
DE Antiviral Agents/*PHARMACOLOGY Base Sequence Cell Fusion/DRUG EFFECTS
Cell Line Cell Survival/DRUG EFFECTS Cells, Cultured DNA
Nucleotidyltransferases/ANTAGONISTS & INHIB DNA, Viral/BIOSYNTHESIS
Flow Cytometry Human HIV Infections/*VIROLOGY HIV-1/*DRUG
EFFECTS/ENZYMOLOGY/PHYSIOLOGY Lymphocytes/DRUG EFFECTS/VIROLOGY
Macrophages/VIROLOGY Molecular Sequence Data
Oligonucleotides/*PHARMACOLOGY Reverse Transcriptase
Inhibitors/PHARMACOLOGY T-Lymphocyte Subsets/VIROLOGY Virus
Replication/DRUG EFFECTS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).