Potent Growth Inhibition of Leukemic Cells by Novel Ribbon-type
Antisense Oligonucleotides to c-myb1
- Affiliated Author(s)
- 박종구
- Alternative Author(s)
- Park, Jong Gu
- Journal Title
- Journal of Biological Chemistry
- ISSN
- 0021-9258
- Issued Date
- 2000
- Abstract
- We studied the effects of antisense oligonucleotides
(AS oligos) with a novel structure. The AS oligos were
covalently closed to avoid exonuclease activities by enzymatic
ligation of two identical molecules. The AS oligos
of a ribbon type (RiAS oligos) consist of two loops
containing multiple antisense sequences and a stem
connecting the two loops. Three antisense sequences
targeting different binding sites were placed in a loop
that was designed to form a minimal secondary structure
by itself. RiAS oligos were found to be stable because
they largely preserved their structural integrity
after 24 h incubation in the presence of either exonuclease
III or serums. When a human promyelocytic cell line,
HL-60, was treated with RiAS oligos to c-myb, c-myb
expression was effectively ablated. Cell growth was
inhibited by >90% determined by both the 3-[4,5-dimethythiazol-
2-yl]-2,5-diphenyltetrazolium bromide assay
and [3H]thymidine incorporation. Further, when the
leukemic cell line K562 was treated with c-myb RiAS
oligos, colony formation on soft agarose was reduced by
92 6 2%. These results suggest that RiAS oligos may be
employed for developing molecular antisense drugs as
well as for the functional study of a gene.
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