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Stem cell factor suppresses apoptosis in neuroblastoma cell lines
F Timeus1, N Crescenzio, P Valle
1Dipartimento di Scienze Pediatriche, University of Torino, Italy.
Experimental Hematology
|November 14, 1997
Summary
Stem cell factor (SCF) supports neuroblastoma growth by preventing apoptosis. Blocking the c-kit receptor with anti-c-kit antibodies significantly reduced neuroblastoma cell viability and increased apoptosis, indicating an autocrine loop.
Area of Science:
- Oncology
- Cell Biology
- Molecular Biology
Background:
- Stem cell factor (SCF) is a growth factor that binds to the c-kit receptor.
- SCF plays a role in hematopoietic progenitor proliferation and is found in various tumor cells.
- Previous research on SCF's role in neuroblastoma yielded conflicting results.
Purpose of the Study:
- To investigate the role of Stem cell factor (SCF) in neuroblastoma.
- To determine if neuroblastoma cell lines express SCF and its receptor c-kit.
- To assess the effect of blocking the c-kit receptor on neuroblastoma cell survival and apoptosis.
Main Methods:
- Studied five neuroblastoma cell lines and one neuroepithelioma line.
- Measured c-kit mRNA and protein expression using flow cytometry.
- Assessed SCF secretion via ELISA.
- Investigated the effects of anti-c-kit antibodies on cell viability and apoptosis (TUNEL assay).
Main Results:
- All studied cell lines expressed c-kit mRNA and protein and secreted SCF.
- Exogenous SCF did not affect thymidine uptake in these cell lines.
- Treatment with anti-c-kit antibodies significantly reduced neuroblastoma cell viability and increased apoptosis.
- No viable cells were detected after 9 days of anti-c-kit treatment.
Conclusions:
- Neuroblastoma cell lines produce SCF, suggesting an autocrine loop.
- This autocrine SCF production protects neuroblastoma cells from apoptosis.
- Targeting the SCF/c-kit pathway may be a potential therapeutic strategy for neuroblastoma.