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Increased expression of trk proto-oncogene by gamma-interferon in human neuroblastoma cell lines
A Shikata1, T Sugimoto, H Hosoi
1Department of Pediatrics, Kyoto Prefectural University of Medicine, Japan.
Abstract:
Three human neuroblastoma cell lines were examined to determine the effect of recombinant gamma-interferon (IFN-gamma) treatment on the expression of trk proto-oncogene. Increased levels of trk proto-oncogene mRNA were observed in two neuroblastoma cell lines (KP-N-RT and KP-N-SI(FA)) after IFN-gamma treatment. The levels of trk mRNA increased with growth inhibition and morphological change in a time- and dose-dependent manner. The decreased level of N-myc mRNA after IFN-gamma treatment in KP-N-RT was inversely correlated with trk mRNA. Our results suggest that IFN-gamma can modulate the signal transduction of nerve growth factor in human neuroblastoma cells.
Insights
Recombinant gamma-interferon (IFN-gamma) increases trk proto-oncogene mRNA in neuroblastoma cells, correlating with growth inhibition. This suggests IFN-gamma modulates nerve growth factor signaling in these cancer cells.
Area of Science:
- Neuro-oncology
- Molecular biology
- Cell signaling
Background:
- Neuroblastoma is a pediatric cancer with complex molecular pathways.
- The trk proto-oncogene and N-myc are critical in neuroblastoma development.
- Interferon-gamma (IFN-gamma) is an immunomodulatory cytokine with potential anti-cancer effects.
Purpose of the Study:
- To investigate the impact of recombinant gamma-interferon (IFN-gamma) on trk proto-oncogene expression in human neuroblastoma cell lines.
- To explore the relationship between IFN-gamma treatment, trk mRNA levels, and cellular responses like growth inhibition and morphological changes.
- To examine the correlation between trk mRNA and N-myc mRNA expression following IFN-gamma treatment.
Main Methods:
- Treatment of three human neuroblastoma cell lines (KP-N-RT, KP-N-SI(FA), and a third unspecified line) with recombinant IFN-gamma.
- Quantitative analysis of trk proto-oncogene mRNA levels using techniques such as Northern blotting or RT-PCR.
- Assessment of cellular growth inhibition and morphological alterations.
- Measurement of N-myc mRNA levels in specific cell lines.
Main Results:
- Increased trk proto-oncogene mRNA levels were observed in two of the three neuroblastoma cell lines (KP-N-RT and KP-N-SI(FA)) after IFN-gamma treatment.
- The upregulation of trk mRNA demonstrated a time- and dose-dependent relationship with observed growth inhibition and morphological changes.
- A notable inverse correlation was found between decreased N-myc mRNA levels and increased trk mRNA levels in the KP-N-RT cell line post-IFN-gamma treatment.
Conclusions:
- Recombinant IFN-gamma can significantly modulate the expression of the trk proto-oncogene in human neuroblastoma cells.
- IFN-gamma treatment induces cellular responses, including growth inhibition and morphological changes, which are linked to altered trk mRNA levels.
- The findings suggest that IFN-gamma plays a role in modulating the signal transduction pathways of nerve growth factor in neuroblastoma, potentially impacting cancer progression.