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068). In multivariate analysis, TLR9 expression was prognostically insignificant due to heavy correlation to disease stage and higher gradus. Treating UT-MUC-1 cells with TLR9 ligand CpG in vitro induced MMP-13 expression and invasion in Matrigel? invasion assay, whereas decreased invasion was seen in myoma organotypic model. Functional TLR9 is present in salivary MEC, and high level of expression may indicate good prognosis. However, more studies are needed to evaluate biological consequences of TLR9 interaction in tumor cells. ""J Oral Pathol Med (2010) 39: 41�C47 Serum amyloid A (SAA) is an acute-phase reactant, the blood level http://www.selleck.cn/products/Imatinib(STI571).html of which is often elevated in response to some types of neoplasia. Here, we investigated expression of the gene SAA1 and the protein SAA in head and neck squamous cell carcinoma (HNSCC) and normal oral mucosal tissues as well as blood SAA levels in HNSCC patients. Also, we investigated the effects of inhibiting signal transducer and activator of transcription 3 (STAT3) signaling on SAA1 expression in the HNSCC cell line SAS. Serum SAA levels in HNSCC patients were significantly higher than those in healthy volunteers. In addition, real-time quantitative reverse transcription-polymerase chain http://www.selleckchem.com/products/SP600125.html reaction analysis revealed a significantly higher SAA1 expression level in HNSCC than in normal mucosa (P? http://www.selleckchem.com/products/AZD6244.html in oral squamous cell carcinoma (OSCC) had been implicated in advanced stage and poor prognosis. It suggests a possible link between the migration/invasion potential of oral cancer cells and the prevalent expression of HDAC2. Methods:? Five head and neck cancer (HNC) cell lines, including Ca9-22, Cal-27, HSC-3, SAS, and TW2.6, were used. Cells stably overexpressing HDAC2 and shRNA against HDAC2 were established to investigate migration/invasion ability in vitro and tumorigenesis and progression in vivo. Results:? We found that alterations in the HDAC2 level in OSCC cell lines modulated their invasive ability with a positive correlation. Animal model also showed that knockdown of HDAC2 expression in SAS cells, originally containing high endogenous HDAC2 expression, resulted in decrease in tumor initiation and progression. Using high-throughput transcriptome analysis, numerous genes involved in HIF-1��-associated pathways were found.