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[The role of interferons in neuroblastoma. 1: Antiproliferative effects]
G Bruchelt1, R Handgretinger, K Schilbach-Stückle
1Univ. Kinderklinik Tübingen, Abt. Hämatologie und Onkologie.
Abstract:
Antiproliferative effects of interferon alpha, beta and gamma were investigated on several human neuroblastoma cell lines using the soft agar colony forming assay and the MTT-test. Investigations were carried out in order to prove whether there is any relationship between antiproliferative effects, inhibition of N-myc expression and the 2-5A system. Growth of neuroblastoma cells was inhibited by all three kinds of interferons in a concentration-dependent manner, however, rather high concentrations were necessary in some cell lines. Expression of N-myc oncogen was not inhibited by interferon-beta and no relationship between antiproliferative effects and the 2-5A system was observed. A vector containing a small N-myc fragment in antisense direction was constructed and transferred into the interferon insensitive human neuroblastoma cell line LS. After transformation, LS cells became sensitive to interferon beta: Proliferation as well as N-myc expression were inhibited and these processes are most probably associated with activation of the 2-5A system.
Insights
Interferons inhibit neuroblastoma cell growth, but N-myc expression is unaffected. Antisense N-myc gene transfer sensitizes cells to interferon beta, inhibiting proliferation and N-myc expression.
Area of Science:
- Oncology
- Virology
- Molecular Biology
Background:
- Neuroblastoma is a pediatric cancer with N-myc oncogene amplification.
- Interferons (IFNs) are cytokines with antiproliferative properties.
- The 2-5A system is involved in IFN-mediated antiviral and antiproliferative effects.
Purpose of the Study:
- To investigate the antiproliferative effects of IFNs on neuroblastoma cells.
- To determine the relationship between IFN effects, N-myc expression, and the 2-5A system.
- To explore strategies for overcoming IFN resistance in neuroblastoma.
Main Methods:
- Soft agar colony forming assay and MTT assay to assess cell proliferation.
- Investigation of N-myc oncogene expression.
- Construction and transfer of an antisense N-myc vector into neuroblastoma cells.
Main Results:
- All three IFNs (alpha, beta, gamma) showed dose-dependent inhibition of neuroblastoma cell growth, requiring high concentrations for some lines.
- Interferon-beta did not inhibit N-myc expression.
- Antisense N-myc transfer rendered IFN-insensitive cells sensitive to interferon-beta, inhibiting both proliferation and N-myc expression, likely via 2-5A system activation.
Conclusions:
- IFN treatment can inhibit neuroblastoma cell proliferation, but efficacy varies.
- N-myc oncogene expression is not directly inhibited by interferon-beta.
- Targeting N-myc with antisense technology can restore sensitivity to interferon-beta, suggesting a potential therapeutic strategy for neuroblastoma.