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Inhibition of Notch-1 pathway is involved in rottlerin-induced tumor suppressive function in nasopharyngeal carcinoma
Yingying Hou1, Shaoyan Feng2, Lixia Wang1
1The Cyrus Tang Hematology Center and Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China.
Abstract:
Recent studies have revealed that rottlerin is a natural chemical drug to exert its anti-cancer activity. However, the molecular mechanisms of rottlerin-induced tumor suppressive function have not been fully elucidated. Notch signaling pathway has been characterized to play a crucial role in tumorigenesis. Therefore, regulation of Notch pathway could be beneficial for the treatment of human cancer. The aims of our current study were to explore whether rottlerin could suppress Notch-1 expression, which leads to inhibition of cell proliferation, migration and invasion in nasopharyngeal carcinoma cells. We performed several approaches, such as CTG, Flow cytometry, scratch healing assay, transwell and Western blotting. Our results showed that rottlerin treatment inhibited cell growth, migration and invasion, and triggered apoptosis, and arrested cell cycle to G1 phase. Moreover, the expression of Notch-1 was obvious decreased in nasopharyngeal carcinoma cells after rottlerin treatment. Importantly, overexpression of Notch-1 promoted cell growth and invasion, whereas down-regulation of Notch-1 inhibited cell growth and invasion in nasopharyngeal carcinoma cells. Notably, we found the over-expression of Notch-1 could abrogate the anti-cancer function induced by rottlerin. Strikingly, our study implied that Notch-1 could be a useful target of rottlerin for the prevention and treatment of human nasopharyngeal carcinoma.
Insights
Rottlerin suppresses nasopharyngeal carcinoma growth by inhibiting Notch-1 expression. This natural compound offers a potential therapeutic strategy by targeting the Notch signaling pathway in cancer treatment.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Rottlerin exhibits anti-cancer properties, but its precise molecular mechanisms remain unclear.
- The Notch signaling pathway is implicated in cancer development and progression.
- Targeting Notch signaling may offer therapeutic benefits for human cancers.
Purpose of the Study:
- To investigate if rottlerin suppresses Notch-1 expression in nasopharyngeal carcinoma (NPC) cells.
- To determine the impact of rottlerin on NPC cell proliferation, migration, invasion, apoptosis, and cell cycle.
- To elucidate the role of Notch-1 in rottlerin's anti-cancer effects in NPC.
Main Methods:
- Cell Counting Kit (CTG) assay for cell viability.
- Flow cytometry for apoptosis and cell cycle analysis.
- Scratch healing and Transwell assays for cell migration and invasion.
- Western blotting to assess protein expression, including Notch-1.
Main Results:
- Rottlerin treatment inhibited NPC cell growth, migration, and invasion.
- Rottlerin induced apoptosis and caused cell cycle arrest at the G1 phase.
- Notch-1 expression was significantly reduced by rottlerin treatment.
- Overexpression of Notch-1 promoted NPC cell growth and invasion, while its down-regulation inhibited these processes.
- Restoring Notch-1 expression abrogated the anti-cancer effects of rottlerin.
Conclusions:
- Rottlerin effectively inhibits nasopharyngeal carcinoma progression by down-regulating Notch-1.
- Notch-1 plays a critical role in mediating the anti-cancer effects of rottlerin in NPC.
- Notch-1 represents a promising therapeutic target for rottlerin-based nasopharyngeal carcinoma treatment.
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