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Updated: May 10, 2026
Quantitative PCR-based Assay to Measure Sonic Hedgehog Signaling in Cellular Model of Ciliogenesis
Published on: January 31, 2025
Hedgehog targeting by cyclopamine suppresses head and neck squamous cell carcinoma and enhances chemotherapeutic
Christian Mozet1, Matthaeus Stoehr, Kamelia Dimitrova
1Department of Otolaryngology, University of Leipzig, Leipzig, Germany. christian.mozet@medizin.uni-leipzig.de
Background:
The hedgehog signaling pathway (HH) is involved in tumorigenesis in a variety of human malignancies. In head and neck squamous cell carcinomas (HNSCC), Hh overexpression was associated with poor prognosis. Therefore, we analyzed the effect of Hh signaling blockade with cyclopamine on colony formation of cells from HNSCC samples.
Patients And Methods:
HNSCC biopsies were cultured alone for reference or with serial dilutions of cyclopamine (5-5,000 nM), docetaxel (137.5-550 nM), or cisplatin (1,667-6,667 nM) and their binary combinations. Cytokeratin-positive colonies were counted after fluorescent staining.
Results:
Cyclopamine concentration-dependently inhibited HNSCC ex vivo [(IC50) at about 500 nM]. In binary combinations, cyclopamine additively enhanced the suppressive effects of cisplatin and docetaxel on HNSCC colony formation.
Conclusion:
Our findings define SMO--a Hh component- as a potential target in HNSCC and suggest the utility of Hh targeting in future multimodal treatment regimens for HNSCC.
Insights
Hedgehog (Hh) signaling blockade with cyclopamine inhibits head and neck squamous cell carcinoma (HNSCC) growth. Cyclopamine enhances chemotherapy effects, suggesting Hh pathway targeting for HNSCC treatment.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- The hedgehog signaling pathway (HH) plays a role in various human cancers.
- Overexpression of Hh signaling in head and neck squamous cell carcinomas (HNSCC) correlates with poor patient prognosis.
- Targeting the Hh pathway is a potential strategy for HNSCC treatment.
Purpose of the Study:
- To investigate the effect of Hh signaling blockade using cyclopamine on the colony formation of HNSCC cells.
- To evaluate the efficacy of cyclopamine alone and in combination with standard chemotherapies (docetaxel and cisplatin) in HNSCC models.
Main Methods:
- Ex vivo culture of HNSCC biopsies.
- Treatment with varying concentrations of cyclopamine, docetaxel, and cisplatin, as well as their binary combinations.
- Quantification of cytokeratin-positive colonies using fluorescent staining to assess treatment effects.
Main Results:
- Cyclopamine demonstrated a concentration-dependent inhibition of HNSCC colony formation, with an IC50 of approximately 500 nM.
- Binary combinations of cyclopamine with cisplatin or docetaxel showed additive suppressive effects on HNSCC colony formation.
- The study identified SMO, a component of the Hh pathway, as a potential therapeutic target.
Conclusions:
- SMO is a promising molecular target for HNSCC treatment.
- Hh pathway inhibition, particularly in combination with chemotherapy, may be a valuable component of future multimodal treatment strategies for HNSCC.
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