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- W2411900003 abstract "Chronic myeloid leukemia (CML) is a hematopoietic stem cell disorder characterized by the BCR-ABL hybrid gene. Two types of hybrid BCR-ABL mRNA have been found, B2A2 and B3A2. As the BCR-ABL rearrangement is specific to leukemic cells, selective inhibition of leukemic cell growth by BCR-ABL antisense oligonucleotides (ASO) has been reported in vitro for CML patients and cell lines. However, controversial results have been obtained from preclinical studies using anti-BCR-ABL ASO, as nonspecific inhibition of leukemic cell growth was evidenced in some cases. B3 exon secondary structure was deduced from its sequence and found to be a loop. According to this predictive structure of exon B3, a 56-mer antisense oligonucleotide targeting the polypurine bases from the B2A2 junction was devised which would inhibit proliferation (MTT assay) of B3A2 junction cell lines (K562 and a murine cell line Ba/F3 transfected with the B3A2 junctional sequence). This ASO had a hairpin-like secondary structure and was found to be much more resistant to the action of nucleases than control 18-mer standard oligonucleotides. Hybridization to its target mRNA occurs via formation of a triplex structure. A concentration of 5 microM of specific 56-mer B2A2 ASO was necessary to demonstrate 50% optical density (OD) reduction for K562 cell line and Ba/F3 transformed by B3A2 cDNA. Sense and non-sense 56-mer sequence or 18-mer linear ASO showed no effect for these concentrations. Western blot showed a partial inhibition of P210 protein; expression of P145abl remains unchanged. The 56-mer ASO also inhibited the proliferation of B2A2 junction cell line BV173 at the same concentration and showed no effect on the HL60 cell line used as control." @default.
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- W2411900003 date "1995-12-01" @default.
- W2411900003 modified "2023-09-25" @default.
- W2411900003 title "Inhibition of chronic myelogenous leukemia cells harboring a BCR-ABL B3A2 junction by antisense oligonucleotides targeted at the B2A2 junction." @default.
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