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Inhibition of proliferation by c-myb antisense RNA and oligodeoxynucleotides in transformed neuroectodermal cell
G Raschellà1, A Negroni, T Skorski
1ENEA (Ente Nuove tecnologie Energia e Ambiente) CRE Casaccia, Division of Molecular Biology, Rome, Italy.
Abstract:
Transfection of a neuroblastoma cell line with expression vectors containing two different segments of human c-myb complementary DNA in antisense orientation yielded far fewer transfectant clones than did the transfection with the identical segments in sense orientation. In cell clones expressing c-myb antisense RNA, levels of the c-myb protein were down-regulated and the proliferation rate was slower than that of cells transfected with sense constructs or the untransfected parental cell line. Treatment of neuroblastoma and neuroepithelioma cell lines with a c-myb antisense oligodeoxynucleotide strongly inhibited cell growth. These data indicate a definite involvement of c-myb in the proliferation of neuroectodermal tumor cells extending the role of this protooncogene beyond the hematopoietic system. The availability of cell clones that transcribe c-myb antisense RNA provides a useful tool to study the involvement of other genes in the proliferation and differentiation of neuroblastoma cells.
Insights
The protooncogene c-myb plays a key role in neuroectodermal tumor cell proliferation. Inhibiting c-myb with antisense RNA or oligodeoxynucleotides significantly slows tumor cell growth.
Area of Science:
- Molecular Biology
- Oncology
- Cell Biology
Background:
- The c-myb protooncogene is primarily known for its role in hematopoietic cell development.
- Its involvement in other cell types, particularly in cancer, is less understood.
Purpose of the Study:
- To investigate the role of the c-myb protooncogene in the proliferation of neuroectodermal tumor cells.
- To explore the potential of c-myb antisense strategies for cancer therapy.
Main Methods:
- Transfection of neuroblastoma cell lines with c-myb complementary DNA (cDNA) in sense and antisense orientations.
- Analysis of c-myb protein levels and cell proliferation rates.
- Treatment of neuroblastoma and neuroepithelioma cell lines with c-myb antisense oligodeoxynucleotides.
Main Results:
- Antisense c-myb cDNA transfection resulted in significantly fewer transfectant clones compared to sense orientation.
- Cell clones expressing c-myb antisense RNA showed down-regulated c-myb protein levels and reduced proliferation rates.
- C-myb antisense oligodeoxynucleotide treatment strongly inhibited the growth of neuroectodermal tumor cell lines.
Conclusions:
- The c-myb protooncogene is definitively involved in the proliferation of neuroectodermal tumor cells.
- This finding extends the known function of c-myb beyond the hematopoietic system.
- Cell clones expressing c-myb antisense RNA serve as valuable tools for studying neuroblastoma cell proliferation and differentiation.