Proteomics of Thyroid Carcinoma: Detection of Potential Biomarkers of Aggressive and Non-aggressive Subtypes

• Main Author: Kashat, Lawrence
• Other Authors: Walfish, Paul
• Language: en_ca
• Published: 2012
• Subjects: Thyroid; Oncology; 0564
• Online Access: http://hdl.handle.net/1807/42890

In search of thyroid carcinoma biomarkers, proteins secreted by thyroid cancer cell lines, papillary-derived TPC-1 and anaplastic-derived CAL62, were analyzed using liquid chromatography-tandem mass spectrometry. Of forty six high-confidence identifications, six proteins were considered for verification in thyroid cancer patients’ tissues and blood. The localization of two proteins, nucleolin and prothymosin-alpha (PTMA), was confirmed in TPC-1 and CAL62 by confocal microscopy and immunohistochemically in xenografts of TPC-1 cells and human thyroid carcinomas. Increased nuclear and cytoplasmic expression of PTMA was observed in anaplastic carcinomas compared to normal thyroid tissues, papillary and poorly differentiated carcinomas. Importantly, six proteins were detected in thyroid cancer patients’ sera, warranting future analysis to confirm their potential as blood-based thyroid cancer markers. Herein we demonstrate the ability of secretome analysis of thyroid cancer cell lines to identify proteins that may be studied for application in management of thyroid carcinomas upon future validation.