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Published on: January 12, 2020
Identification of acquired Notch3 dependency in metastatic Head and Neck Cancer
Maria Kondratyev1, Aleksandra Pesic2, Troy Ketela2
1Princess Margaret Cancer Centre University Health Network, Toronto, ON, Canada. mashlo88@gmail.com.
Abstract:
During cancer development, tumor cells acquire changes that enable them to invade surrounding tissues and seed metastasis at distant sites. These changes contribute to the aggressiveness of metastatic cancer and interfere with success of therapy. Our comprehensive analysis of "matched" pairs of HNSCC lines derived from primary tumors and corresponding metastatic sites identified several components of Notch3 signaling that are differentially expressed and/or altered in metastatic lines and confer a dependency on this pathway. These components were also shown to be differentially expressed between early and late stages of tumors in a TMA constructed from over 200 HNSCC patients. Finally, we show that suppression of Notch3 improves survival in mice in both subcutaneous and orthotopic models of metastatic HNSCC. Novel treatments targeting components of this pathway may prove effective in targeting metastatic HNSCC cells alone or in combination with conventional therapies.
Insights
This study reveals that Notch3 signaling is crucial for head and neck squamous cell carcinoma (HNSCC) metastasis. Targeting Notch3 shows promise for treating aggressive HNSCC and improving patient survival.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Tumor cells acquire aggressive traits enabling invasion and metastasis.
- Metastatic cancer poses significant therapeutic challenges.
- Understanding molecular drivers of metastasis is critical for effective treatment.
Purpose of the Study:
- To investigate the role of Notch3 signaling in head and neck squamous cell carcinoma (HNSCC) metastasis.
- To identify specific Notch3 pathway components altered in metastatic HNSCC.
- To evaluate the therapeutic potential of targeting Notch3 in HNSCC.
Main Methods:
- Comparative analysis of matched primary and metastatic HNSCC cell lines.
- Analysis of Notch3 pathway component expression in patient tumor tissues (TMA).
- In vivo studies using mouse models of metastatic HNSCC to assess Notch3 suppression efficacy.
Main Results:
- Differential expression and alterations of Notch3 signaling components were identified in metastatic HNSCC lines.
- Notch3 pathway dependency was observed in metastatic cells.
- Notch3 pathway components were differentially expressed between early and late-stage HNSCC tumors.
- Suppression of Notch3 significantly improved survival in preclinical models of metastatic HNSCC.
Conclusions:
- Notch3 signaling is a key driver of HNSCC metastasis.
- Targeting Notch3 pathway components offers a potential therapeutic strategy for metastatic HNSCC.
- Novel treatments targeting Notch3 could be effective alone or in combination with existing therapies.
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