title: Overexpression of cathepsin Z contributes to tumor metastasis by inducing epithelial-mesenchymal transition in hepatocellular carcinoma.
abstract: The aim of this study was to characterize the oncogenic function and mechanism of Cathepsin Z (CTSZ) at 20q13.3, a frequently amplified region in hepatocellular carcinoma (HCC). Real-time PCR were used to compare CTSZ expression between paired HCC tumor and non-tumor specimens. CTSZ gene was stably transfected into HCC line QGY-7703 cells and its role in tumorigenicity and cell motility was characterized by soft agar, wound-healing, transwell invasion and cell adhesion assay, and tumor xenograft mouse model. Western blot analysis was used to study expression of proteins associated with epithelial-mesenchymal transition (EMT).Upregulation of CTSZ was detected in 59/137 (43%) of primary HCCs, which was significantly associated with advanced clinical stage (P = 0.000). Functional study found that CTSZ could increase colony formation in soft agar and promote cell motility. Further study found that the metastatic effect of CTSZ was associated with its role in inducing epithelial-mesenchymal transition (EMT) by upregulating mesenchymal markers (fibronectin and vimentin) and downregulating epithelial markers (E-cadherin and α-catenin). In addition, CTSZ could also upregulate proteins associated with extracellular matrix remodeling such as MMP2, MMP3 and MMP9. Taken together, our data suggested that CTSZ was a candidate oncogene within the 20q13 amplicon and it played an important role in HCC metastasis.
authors.affiliation: Department of Clinical Oncology, The University of Hong Kong, Hong Kong, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Leilei
authors.initials: L
authors.lastname: Chen
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Xin-Yuan
authors.initials: XY
authors.lastname: Guan
mesh_terms: D000362:Agar / Q000737:chemistry; D000818:Animals; D015820:Cadherins / Q000096:biosynthesis; D006528:Carcinoma, Hepatocellular / Q000378:metabolism*; D056663:Cathepsin Z / Q000096:biosynthesis*; D002448:Cell Adhesion; D002465:Cell Movement; D058750:Epithelial-Mesenchymal Transition; D005353:Fibronectins / Q000096:biosynthesis; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008113:Liver Neoplasms / Q000378:metabolism*; D008297:Male; D020782:Matrix Metalloproteinases / Q000096:biosynthesis; D051379:Mice; D016513:Mice, SCID; D009362:Neoplasm Metastasis; D009368:Neoplasm Transplantation; D014746:Vimentin / Q000096:biosynthesis; D014945:Wound Healing; D051178:alpha Catenin / Q000096:biosynthesis
chemical_list: D015820:Cadherins; D005353:Fibronectins; D014746:Vimentin; D051178:alpha Catenin; D000362:Agar; D056663:Cathepsin Z; D020782:Matrix Metalloproteinases