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Effects of anti-tal-1 oligodeoxynucleotides in T-ALL cell lines
B Anderegg1, M Horstmann, H Kabisch
1Department of Hematology/Oncology, Children's Hospital, Clinical Center for the University of Hamburg, Germany. anderegg@uke.uni-hamburg.de
Abstract:
Rearrangement of the gene tal-1 leads to transcriptional dysregulation and contributes to the formation of childhood T-cell acute lymphoblastic leukemia. Therefore, we tried to interfere with the transcription of the SIL/tal-1 fusion gene, the most common form of aberrant tal-1, by treatment with antisense oligodeoxynucleotides (ODNs). The potential of two different strategies was investigated, one targeting the cell line specific SIL/tal-1 fusion region, the other using an ODN complementary to tal-1 sequence downstream of the region not affected by any of the known types of tal-1 rearrangement. With both approaches a single-dose application of 3 mumol of ODN led to a significant antiproliferative effect of a about 25-60% in two T-ALL cell lines characterized by the SIL/tal-1 fusion gene. Investigation of the tal-1 mRNA level by reverse transcription-polymerase chain reaction was in concordance with these results: In both cell lines clearly less of the tal-1-specific fragment was generated after incubation with the antisense ODN tal-1 common than in the control experiments with a mismatched ODN or no ODN at all. Neither the antiproliferation antisense effect nor the downregulation of the steady state tal-1 mRNA level was observed in control cell lines bearing wildtype tal-1.
Insights
Antisense oligodeoxynucleotides (ODNs) targeting the SIL/tal-1 fusion gene significantly reduced proliferation and tal-1 mRNA levels in T-cell acute lymphoblastic leukemia (T-ALL) cell lines.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- The tal-1 gene rearrangement is a key factor in childhood T-cell acute lymphoblastic leukemia (T-ALL).
- The SIL/tal-1 fusion gene represents the most common aberrant form of tal-1, driving leukemogenesis.
Purpose of the Study:
- To investigate the therapeutic potential of antisense oligodeoxynucleotides (ODNs) against the SIL/tal-1 fusion gene.
- To evaluate two distinct antisense ODN strategies targeting the aberrant tal-1 transcription.
Main Methods:
- Treatment of T-ALL cell lines with two different antisense ODN strategies targeting the SIL/tal-1 fusion or tal-1 sequence.
- Assessment of antiproliferative effects following single-dose ODN application.
- Quantification of tal-1 mRNA levels using reverse transcription-polymerase chain reaction (RT-PCR).
Main Results:
- A single 3 mumol dose of ODN induced a significant antiproliferative effect (25-60%) in T-ALL cell lines with the SIL/tal-1 fusion.
- Antisense ODN treatment markedly reduced tal-1 mRNA levels, confirmed by RT-PCR.
- Control cell lines with wild-type tal-1 did not exhibit these antiproliferative or mRNA-downregulating effects.
Conclusions:
- Antisense ODN therapy targeting the SIL/tal-1 fusion gene demonstrates significant antiproliferative activity in T-ALL.
- This approach effectively downregulates tal-1 mRNA expression, offering a potential therapeutic strategy for T-ALL.
- The specificity of the effect was confirmed in cell lines with wild-type tal-1.