Overexpression of metastasis-associated MTA1 in oral squamous cell carcinomas: correlation with metastasis and invasion

• Published in: International journal of oral and maxillofacial surgery Vol. 37; no. 11; pp. 1039 - 1046
• Main Authors: Kawasaki, G, Yanamoto, S, Yoshitomi, I, Yamada, S, Mizuno, A
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-11-2008; Elsevier
• Subjects: Biological and medical sciences; Biotechnology; Carcinoma, Squamous Cell - genetics; Carcinoma, Squamous Cell - metabolism; Carcinoma, Squamous Cell - pathology; Fundamental and applied biological sciences. Psychology; Gene Expression Regulation, Neoplastic; Gene Silencing; Genetic engineering; Genetic technics; Histone Deacetylases - genetics; Histone Deacetylases - metabolism; Humans; invasion; Medical sciences; metastasis; Methods. Procedures. Technologies; Modification of gene expression level; Mouth Neoplasms - genetics; Mouth Neoplasms - metabolism; Mouth Neoplasms - pathology; MTA1; Neoplasm Invasiveness; Neoplasm Staging; oral cancer; Otorhinolaryngology. Stomatology; Proliferating Cell Nuclear Antigen - metabolism; Repressor Proteins - genetics; Repressor Proteins - metabolism; RNA interference; RNA, Messenger - analysis; Surgery; Trans-Activators; Tumor Cells, Cultured; Tumors; Upper respiratory tract, upper alimentary tract, paranasal sinuses, salivary glands: diseases, semeiology; MTA1; RNA interference; invasion; metastasis; oral cancer; Correlation; Oral cancer; Stomatology; Malignant tumor; Oral squamous cell carcinoma; Metastasis; Invasion; Gene silencing; Treatment; Surgery; Oral cavity disease; Cancer
• ISSN: 0901-5027; 1399-0020
• DOI: 10.1016/j.ijom.2008.05.020

Abstract Metastasis-associated protein 1 (MTA1) is physiologically expressed at low levels in human tissues. Its expression is associated with progression of solid cancers and is common in cancer cell lines. This study investigated whether MTA1 was expressed in squamous cell carcinoma (SCC) and would be a useful metastatic marker. Specimens from 38 patients with oral SCC were stained using the avidin-biotin-peroxidase technique with polyclonal antibodies against MTA1. Human SCC cell lines SAS, HSC2, OSC19 and OSC20 were analysed for MTA1 mRNA expression. MTA1 expression in control tissues was significantly lower than in carcinomas. MTA1 protein expression was detected in 33 of 38 SCC tissues from patients. Histologically, MTA1 protein production was strongly associated with cancer cell invasion, and clinically there was a correlation between lymph node metastasis and MTA1 protein production. Among the cancer cell lines, HSC2 showed the lowest mRNA expression, and OSC20 showed the highest MTA1 mRNA expression. In the Matrigel invasion assay, the HSC2 cell line showed the lowest invasion and the OSC20 cell line showed the highest invasion. RNAi-mediated MTA1 silencing in the OSC20 cells decreased the invasion index. MTA1 expression in oral SCC may be associated with increased invasive ability, which may cause lymph node metastasis.