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Updated: Mar 1, 2026
Evaluating the Effectiveness of Cancer Drug Sensitization In Vitro and In Vivo
Published on: February 6, 2015
Efficacy of targeted drugs in germ cell cancer cell lines with differential cisplatin sensitivity
Judith Schaffrath1, Hans-Joachim Schmoll2, Wieland Voigt3
1Department of Internal Medicine IV, Oncology/Hematology, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany.
Methods:
The in vitro activity of kinase inhibitors targeting mTOR (RAD001), EGFR, HER2/neu, VEGFR (AEE788) and IGF-1R (AEW541) alone or in combination with cisplatin was tested in the cisplatin sensitive TGCT cell lines H12.1 and GCT72 as well as in the resistant cell lines H12.1RA, H12.1D, 1411HP and 1777NRpmet using the sulforhodamin-B-(SRB)-cytotoxicity-assay. To evaluate the activity of the kinase inhibitors, western blot analysis of the targeted receptors and their phosphorylated state was performed before and after exposure to each substance.
Results:
The different kinase inhibitors demonstrated significant cell growth inhibition in both cisplatin sensitive and resistant cell lines. The examined cell lines showed different protein expression levels of the targeted receptors. However there was no correlation between the targeted receptor expression and phosphorylation level and the antiproliferative effect of the respective agent. Furthermore, the combination of cisplatin and the kinase inhibitors exerted both additive and antagonistic effects in the studied cell lines.
Conclusion:
Our data suggest potential activity of the investigated kinase inhibitors in both cisplatin sensitive and resistant TGCT cell lines as a single agent. However, when combined with cisplatin they did not demonstrate any promising ability to overcome cisplatin resistance in TGCTs.
Insights
Kinase inhibitors show potential against testicular germ cell tumors (TGCTs) as single agents. However, combining them with cisplatin did not overcome cisplatin resistance in TGCT cell lines.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Testicular germ cell tumors (TGCTs) present challenges in treatment, particularly regarding cisplatin resistance.
- Kinase inhibitors offer targeted therapeutic strategies for various cancers.
Purpose of the Study:
- To evaluate the in vitro efficacy of specific kinase inhibitors (mTOR, EGFR, HER2/neu, VEGFR, IGF-1R) in cisplatin-sensitive and resistant TGCT cell lines.
- To assess the combined effects of these kinase inhibitors with cisplatin.
Main Methods:
- Utilized sulforhodamine-B (SRB) cytotoxicity assays to determine cell growth inhibition.
- Employed western blot analysis to examine targeted receptor expression and phosphorylation states before and after treatment.
Main Results:
- Kinase inhibitors demonstrated significant antiproliferative effects in both cisplatin-sensitive and resistant TGCT cell lines.
- No direct correlation was found between targeted receptor expression/phosphorylation and the antiproliferative response.
- Combinations of cisplatin with kinase inhibitors showed both additive and antagonistic effects.
Conclusions:
- The studied kinase inhibitors exhibit potential as monotherapy for TGCTs, regardless of cisplatin sensitivity.
- Combination therapy with cisplatin did not prove effective in overcoming cisplatin resistance in TGCT models.
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