title: Increased expression of Cathepsin B in oral squamous cell carcinoma.
abstract: Previously, an in vitro cellular carcinogenesis model of oral squamous cell carcinoma (OSCC) was established with a line of human immortalized oral epithelial cells (HIOECs), a line of cancerous HB96 cells and another type of cell (HB56 cells) at the early stage of carcinogenesis. In this study, comparative proteomic analysis identified a panel of differentially expressed proteins among these cells. Cathepsin B was one of the significantly up-regulated proteins accompanying cellular transformation. Cathepsin B was further validated for its expression in the three cell lines and in clinical samples of tumour tissues and their adjacent normal epithelia from 30 primary OSCC patients. Western blot analysis and real-time PCR detected increased Cathepsin B protein and mRNA levels in the cancerous HB56 and HB96 cells over HIOECs. Immunohistochemistry and real-time PCR showed elevated Cathepsin B protein and mRNA levels in the tumour tissues over the adjacent non-malignant epithelia from OSCC patients. The results presented here suggest that the expression of Cathepsin B increases along with the cancerisation in OSCC both in vitro and in vivo, and it may serve as a candidate biomarker of OSCC.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, School of Stomatology, Shanghai Jiao Tong University School of Medicine, No. 639 Zhizaoju Road, Shanghai 200011, China.
authors.forename: X
authors.initials: X
authors.lastname: Yang
authors.forename: K-j
authors.initials: KJ
authors.lastname: Wei
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: H-y
authors.initials: HY
authors.lastname: Pan
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.forename: W-t
authors.initials: WT
authors.lastname: Chen
authors.forename: L-p
authors.initials: LP
authors.lastname: Zhong
authors.forename: Z-y
authors.initials: ZY
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis; D015153:Blotting, Western; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D002401:Cathepsin B / Q000032:analysis*; D045744:Cell Line, Tumor; D002471:Cell Transformation, Neoplastic / Q000473:pathology; D002851:Chromatography, High Pressure Liquid; D015180:Electrophoresis, Gel, Two-Dimensional; D004591:Electrophoresis, Polyacrylamide Gel; D004848:Epithelium / Q000473:pathology; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009061:Mouth Mucosa / Q000473:pathology; D009062:Mouth Neoplasms / Q000473:pathology*; D009367:Neoplasm Staging; D016133:Polymerase Chain Reaction / Q000379:methods; D020543:Proteome / Q000032:analysis; D053719:Tandem Mass Spectrometry; D014158:Transcription, Genetic / Q000235:genetics; D015854:Up-Regulation / Q000235:genetics
chemical_list: D014408:Biomarkers, Tumor; D020543:Proteome; C533912:CTSB protein, human; D002401:Cathepsin B