title: Tid1 functions as a tumour suppressor in head and neck squamous cell carcinoma.
abstract: Human tumourous imaginal disc (Tid1), a human homologue of the Drosophila tumour suppressor protein Tid56, is involved in multiple intracellular signalling pathways such as apoptosis, cell proliferation, and cell survival. Here, we investigated the anti-tumourigenic activity of Tid1 in head and neck squamous cell carcinoma (HNSCC) in vitro and in vivo. Firstly, the clinical association between Tid1 expression and progression of HNSCC was explored. It was found that expression of Tid1 was negatively associated with tumour status, recurrence, and survival prognosis using immunohistochemical analysis of primary HNSCC patient tumour tissue. Secondly, ectopic expression of Tid1 in HNSCC cells was shown to significantly inhibit cell proliferation, migration, invasion, anchorage-independent growth, and xenotransplantation tumourigenicity. Thirdly, we showed that overexpression of Tid1 attenuated EGFR activity and blocked the activation of AKT in HNSCC cells, which are known to be involved in the regulation of survival in HNSCC cells. On the other hand, ectopic expression of constitutively active AKT greatly reduced apoptosis induced by Tid1 overexpression. Together, these findings suggest that Tid1 functions as a tumour suppressor in HNSCC tumourigenesis.
authors.affiliation: Institute of Oral Biology, National Yang-Ming University, Taipei, Taiwan, ROC.
authors.forename: Chi-Yuan
authors.initials: CY
authors.lastname: Chen
authors.forename: Shih-Hwa
authors.initials: SH
authors.lastname: Chiou
authors.forename: Chih-Yang
authors.initials: CY
authors.lastname: Huang
authors.forename: Chia-Ing
authors.initials: CI
authors.lastname: Jan
authors.forename: Shu-Chun
authors.initials: SC
authors.lastname: Lin
authors.forename: Wen-Yuan
authors.initials: WY
authors.lastname: Hu
authors.forename: Shiu-Huey
authors.initials: SH
authors.lastname: Chou
authors.forename: Chung-Ji
authors.initials: CJ
authors.lastname: Liu
authors.forename: Jeng-Fan
authors.initials: JF
authors.lastname: Lo
mesh_terms: D000328:Adult; D000368:Aged; D000818:Animals; D017209:Apoptosis / Q000502:physiology; D002294:Carcinoma, Squamous Cell / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D002448:Cell Adhesion / Q000502:physiology; D002465:Cell Movement / Q000502:physiology; D049109:Cell Proliferation; D002471:Cell Transformation, Neoplastic / Q000378:metabolism / Q000473:pathology; D066246:ErbB Receptors / Q000378:metabolism; D005260:Female; D050956:HSP40 Heat-Shock Proteins / Q000378:metabolism* / Q000502:physiology; D006258:Head and Neck Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D008297:Male; D051379:Mice; D008819:Mice, Nude; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D009368:Neoplasm Transplantation; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D014407:Tumor Cells, Cultured; D025521:Tumor Suppressor Proteins / Q000378:metabolism* / Q000502:physiology
chemical_list: C120664:DNAJA3 protein, human; D050956:HSP40 Heat-Shock Proteins; D025521:Tumor Suppressor Proteins; D019869:Phosphatidylinositol 3-Kinases; C512478:EGFR protein, human; D066246:ErbB Receptors; D051057:Proto-Oncogene Proteins c-akt