Related Experiment Video
Updated: Feb 11, 2026
Radiosensitivity of Cancer Stem Cells in Lung Cancer Cell Lines
Published on: August 21, 2019
In cancer cell lines inhibition of SCF/c-Kit pathway leads to radiosensitization only when SCF is strongly
Fabian Eberle1, Florian H Leinberger1, Miriam F Saulich1
1Department of Radiotherapy and Radiooncology, Philipps University, Marburg, Germany.
Background And Purpose:
The SCF/c-Kit pathway is often overexpressed in human tumors leading to an enhanced tumorigenesis, proliferation and migration. It was now tested for NSCLC and prostate cancer cells growing in 2D and 3D whether the inhibition of this pathway can be used to achieve a significant radiosensitization and whether a respective biomarker may be identified.
Material And Methods:
Experiments were performed with different cancer cell lines (NSCLC: H23, H520, H226, H1975 and PrCa: DU145) growing either under 2D or 3D conditions. Expression of SCF and c-Kit was determined by RT-PCR and Western blot, SCF was knocked down by siRNA, c-Kit was inhibited by ISCK03 inhibitor and cell survival was determined by colony formation assay.
Results:
There is a profound variation in the expression of both c-Kit and SCF with no association between each other. Neither levels did correlate with the respective cellular radiosensitivity determined for 2D or 3D with only a trend seen for SCF. Knock-down of SCF was generally found to result in no or only minor reduction of plating efficiency or cellular radioresistance. A significant reduction was only obtained for H520 cells characterized by an extreme over-expression of SCF. The inhibition of c-Kit by a specific inhibitor was also found to result only in minor radiosensitization.
Conclusion:
Generally, the SCF/c-Kit pathway does not have a dominant effect on both, cell survival and radioresponse and, as a consequence, knockdown of this pathway does not result in a strong effect on radioresistance, except when SCF is strongly over-expressed.
Insights
The SCF/c-Kit pathway generally does not significantly impact cancer cell radioresistance. Inhibition showed minor radiosensitization, except in cells with high SCF expression, suggesting limited therapeutic potential.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- The stem cell factor (SCF)/c-Kit pathway is frequently overexpressed in human tumors.
- This pathway promotes tumorigenesis, proliferation, and migration.
Purpose of the Study:
- To investigate if inhibiting the SCF/c-Kit pathway can radiosensitize non-small cell lung cancer (NSCLC) and prostate cancer (PrCa) cells.
- To identify potential biomarkers associated with radiosensitization.
Main Methods:
- Utilized NSCLC and PrCa cell lines cultured in 2D and 3D.
- Assessed SCF and c-Kit expression via RT-PCR and Western blot.
- Performed SCF knockdown (siRNA), c-Kit inhibition (ISCK03), and colony formation assays.
Main Results:
- SCF and c-Kit expression varied significantly between cell lines, with no correlation to each other or radiosensitivity.
- SCF knockdown generally had minimal impact on cell survival and radioresistance.
- Significant radiosensitization was observed only in H520 cells with extreme SCF overexpression.
- c-Kit inhibition resulted in only minor radiosensitization.
Conclusions:
- The SCF/c-Kit pathway is not a dominant factor in cell survival or radioresponse in most tested cancer cells.
- Targeting this pathway offers limited potential for enhancing radioresistance, with exceptions for high SCF-expressing tumors.
Related Concept Videos
00:46Feedback Inhibition
01:16Cell Lines
01:42What is Gene Expression?
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
01:27C4 Pathway and CAM
C4 Pathway
The C4 pathway is used by plants such as...
01:58Cell Specific Gene Expression
02:24Regulation of Expression Occurs at Multiple Steps
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...