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M94B0791.TXT
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1994-11-11
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Document 0791
DOCN M94B0791
TI Hyperstabilization of sense-antisense duplexes and inhibition of
translation (Meeting abstract).
DT 9412
AU Kim DY; Shih DS; Cho DY; Swenson DH; School of Veterinary Medicine,
Louisiana State University, Baton; Rouge, LA 70803
SO Proc Annu Meet Am Assoc Cancer Res; 35:A1835 1994. Unique Identifier :
AIDSLINE ICDB/94603521
AB The antitumor agents CC-1065 and U-71,184 raise the Tm of
double-stranded DNA. We undertook this study to determine if these
agents could hyperstabilize RNA-DNA (sense-antisense) duplexes or DNA
duplexes in which one strand contained phosphorothioate (PS) or
methylphosphonate (MP) internucleotide linkages. Sequences 1 and 2
(5'-TTACTTCAGTTATCAGACCA-3'; CC-1065 target underlined) were from the
env gene of equine infectious anemia virus (EIAV). Seq 1 was DNA and seq
2 was RNA. Antisense seq 3, 4 and 5 were complementary to seqs 1 and 2
and were comprised of phosphodiester (PO), PS and MP, resp. Duplexes
from seq1-seq3, seq1-seq4, seq1-seq5 all bound CC-1065 and showed
elevations in Tm of 17 to 21 C. Poly(rA)-oligo(dT20) and
oligo(dA20)-oligo(dT20) showed increases in Tm of 28 and 31 C, resp,
when bound to CC-1065. Seq2-seq3 and seq2-seq4 each bound 1
CC-1065/duplex, but insufficient material was available to evaluate Tm.
U-71,184 caused strong elevation of Tm (greater than 15 C) only with
seq1-seq5 and oligo(dA20)-oligo(dT20). An mRNA transcript (585-mer) of
EIAV was targeted approx 200 bases downstream from the initiation site
with a 20-mer PO antisense oligonucleotide. Translation (wheat germ
extract) was inhibited in a dose-dependent fashion at antisense:mRNA
ratios ranging from 10 to 72, and concomitant incubations of the
duplexes with CC-1065 (4x compared to antisense) caused significant
enhanced depression of translation for the higher doses. A 20-mer sense
sequence, incubated with the MRNA, with and without CC-1065, had little
or no effect on translation. Antisense oligonucleotides tethered to
CC-1065-like ligands may yield duplexes with MRNA of high stability.
DE Base Sequence *Genes, env Infectious Anemia Virus, Equine/*GENETICS
Molecular Sequence Data Oligodeoxyribonucleotides/*TOXICITY
Oligonucleotides, Antisense/*TOXICITY RNA, Messenger/BIOSYNTHESIS
Transcription, Genetic Translation, Genetic/*DRUG EFFECTS
Wheat/METABOLISM MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).