title: Decreased expression of S100A6 in oral squamous cell carcinoma.
abstract: We previously established an in vitro cellular carcinogenesis model of oral squamous cell carcinoma (OSCC) with a line of human immortalized oral epithelia cells (HIOECs), a line of cancerous HB96 cells, and other cells (HB56 cells) at the early stage of carcinogenesis. In this study, comparative proteomic analysis identified a panel of differentially expressed proteins among these cells, and S100A6 was shown as one of the significantly down-regulated proteins accompanying cellular transformation. S100A6 was further validated for its expression in the three cell lines and in the clinical samples of cancerous and paracancerous tissues from 30 primary OSCC patients. Western blot analysis and real-time PCR revealed the decreased S100A6 protein and mRNA levels in the cancerous HB56 and HB96 cells over HIOECs. Immunohistochemistry and real-time PCR also showed decreased S100A6 protein and mRNA levels in the cancerous tissues compared to the paracancerous tissues from OSCC patients. The results presented here suggest that the expression of S100A6 decreases along with the cancerization in OSCC both in vitro and in vivo.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, School of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, PR China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Yang
authors.forename: Kui-Jie
authors.initials: KJ
authors.lastname: Wei
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Hong-Ya
authors.initials: HY
authors.lastname: Pan
authors.forename: Dong-Xia
authors.initials: DX
authors.lastname: Ye
authors.forename: Lai-Ping
authors.initials: LP
authors.lastname: Zhong
authors.forename: Zhi-Yuan
authors.initials: ZY
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000595:Amino Acid Sequence; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D018797:Cell Cycle Proteins / Q000235:genetics* / Q000378:metabolism; D045744:Cell Line, Tumor; D002471:Cell Transformation, Neoplastic / Q000235:genetics / Q000378:metabolism; D015536:Down-Regulation; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009062:Mouth Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D000075383:S100 Calcium Binding Protein A6; D009418:S100 Proteins / Q000235:genetics* / Q000378:metabolism; D054928:Validation Studies as Topic
chemical_list: D018797:Cell Cycle Proteins; D000075383:S100 Calcium Binding Protein A6; D009418:S100 Proteins; C055351:S100A6 protein, human