N-cadherin promotes thyroid tumorigenesis through modulating major signaling pathways

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Epithelial-mesenchymal transition (EMT) is critical for tumor metastasis.
• N-cadherin is an EMT marker and oncogene, but its role in thyroid cancer is unclear.

Purpose of the Study:

• To investigate the biological functions and molecular mechanisms of N-cadherin in thyroid tumorigenesis.
• To assess N-cadherin as a potential therapeutic target in thyroid cancer.

Main Methods:

• Quantitative RT-PCR and immunohistochemistry for N-cadherin expression analysis.
• In vitro assays including proliferation, colony formation, cell cycle, apoptosis, migration, and invasion.
• N-cadherin knockdown and ectopic expression studies in thyroid cancer cells.

Main Results:

• N-cadherin was significantly upregulated in papillary thyroid cancers (PTCs).
• N-cadherin knockdown inhibited proliferation, colony formation, migration, invasion, and induced cell cycle arrest and apoptosis.
• Ectopic N-cadherin expression enhanced thyroid cancer cell growth and invasiveness.
• N-cadherin's pro-tumorigenic role involves MAPK/Erk, PI3K/Akt, and p16/Rb signaling pathways, alongside EMT.

Conclusions:

• N-cadherin promotes thyroid tumorigenesis by influencing EMT and major signaling pathways.
• N-cadherin represents a potential therapeutic target for thyroid cancer.