Engrailed-1 Promotes Tumor Progression and Metastasis in Papillary Thyroid Cancer

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• The role of Transcription factor Engrailed-1 (EN1) in papillary thyroid carcinoma (PTC) is currently unknown.
• EN1 is implicated as an oncogene in other solid tumors.

Purpose of the Study:

• To investigate EN1 expression in PTC clinical specimens and its correlation with clinical outcomes.
• To explore the function of EN1 in PTC progression using in vitro and in vivo models.

Main Methods:

• Retrospective analysis of 376 PTC tissues using immunohistochemistry for EN1 expression.
• In vitro studies involving EN1 knockdown/overexpression to assess cell invasion, migration, proliferation, and apoptosis.
• In vivo studies using xenograft and tail-vein injection models in mice to evaluate tumor growth and metastasis.

Main Results:

• EN1 is significantly overexpressed in PTC tissues and correlates with lymphovascular invasion, lymph node metastasis, advanced TNM stage, and recurrence.
• EN1 overexpression promotes PTC cell invasion, migration, and proliferation in vitro, while EN1 knockdown inhibits these processes and induces apoptosis.
• EN1 silencing reduced tumor growth and lung metastasis in vivo, whereas EN1 overexpression enhanced these malignant phenotypes.

Conclusions:

• EN1 acts as a driver of PTC aggressiveness and metastasis.
• EN1 shows potential as a prognostic biomarker and therapeutic target for PTC.