Abstract:

Objective  This study aimed to explore further the mechanisms of tongue squamous cell carcinoma (TSCC) cell recurrence, metastasis, and diffusion, as well as to establish the experimental basis for the molecular biology research on TSSC. We intend to complete our objective through differential proteomics and preliminary analysis protein expression of exosomes derived from TSCC and normal mucosa cells. Methods  We acquired cultured supernatant fluid in vitro in the laboratory by culturing TSCC (tongue cancer Tca8113 cell line) and human normal mucosa cells (HOK cell line). The exo-somes were separated and purified through differential centrifugation. Furthermore, the different protein expressions were identified through dielectrophoresis and mass spectrometry. The functions of the different protein expressions were identified through an online database search. Results  TSCC and human normal mucosa cells secrete a large amount of capsule bubble structure substances in vitro, as confirmed by electron microscopy and surface markers heat shock protein-70 and major histocompatibility complex class Ⅰ. A total of 16 oral cancer cell-derived exosomes that expressed quantity more than two times, twelve that increased their expression levels, and four that cut their expressions were identified through the differential proteomics research on the two groups. Conclusion  Differential proteins that were verified through the online database serve an important function in exosome formation and in the progress of cancer.

Key words: tongue squamous cell carcinoma, exosome, dielectrophoresis, mass spectrometry, differential proteomics