Nodal Promotes the Migration and Invasion of Bladder Cancer Cells via Regulation of Snail

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Urinary bladder cancer is a prevalent malignancy globally, particularly in males.
• Understanding metastasis mechanisms is crucial for effective bladder cancer therapy and drug development.
• Nodal, an embryonic morphogen, influences tumorigenesis.

Purpose of the Study:

• To investigate the role of Nodal in bladder cancer progression and metastasis.
• To elucidate the molecular mechanisms by which Nodal affects bladder cancer cell malignancy.
• To assess Nodal as a potential therapeutic target for bladder cancer.

Main Methods:

• Quantitative analysis of Nodal expression in bladder cancer tissues and cells.
• Nodal knockdown experiments using siRNA (si-Nodal) to assess effects on cell migration, invasion, and epithelial-to-mesenchymal transition (EMT).
• Investigation of Nodal's regulatory effects on Snail expression, including transcription and protein stability, involving YY1 and ATM.

Main Results:

• Nodal expression is upregulated in bladder cancer cells and tissues.
• Nodal knockdown significantly suppresses bladder cancer cell migration, invasion, and EMT.
• Nodal positively regulates Snail expression by increasing its transcription (via YY1) and protein stability (via ATM-mediated phosphorylation).
• Overexpression of Snail partially rescues the suppressive effects of Nodal knockdown on cell migration and invasion.

Conclusions:

• Nodal promotes bladder cancer cell malignancy by enhancing Snail's transcriptional activation and protein stability.
• The Nodal-Snail axis is a key pathway driving bladder cancer metastasis.
• Nodal represents a promising therapeutic target for bladder cancer treatment.