title: Upregulation of the cysteine protease inhibitor, cystatin SN, contributes to cell proliferation and cathepsin inhibition in gastric cancer.
abstract: BACKGROUND
  Cysteine proteases like cathepsins are widely distributed proteolytic enzymes and form tight equimolar complexes with cystatins at their active sites. Among cystatins, CST1, encoding cystatin SN, is a member of the type 2 salivary cystatin family found in a variety of fluids and secretions, including plasma, tears, and saliva. CST1 was identified as an upregulated gene in gastric cancer tissues compared to noncancerous regions using our Affymetrix GeneChip microarray.
  
  
  METHODS
  The upregulation of CST1 in gastric cancer was analyzed using RT-PCR (n=15), immnohistochemistry, and clinicopathological (n=77) analysis. CST1-siRNA was used for the suppression of CST1 gene expression and cathepsin proteolytic activity was assayed.
  
  
  RESULTS
  CST1 was upregulated in cancerous lesions of gastric cancer tissues compared to noncancerous regions and clinicopathological analysis showed a significant correlation between high expression of CST1 and pTNM stage (p=0.044). In CST1-siRNA transfected cells, cell proliferation was reduced and the proteolytic activity of cathepsins was increased.
  
  
  CONCLUSIONS
  CST1 might be highly involved in gastric tumorigenesis and regulate the proteolytic activity of cysteine proteases.
authors.affiliation: Medical Genomic Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Republic of Korea.
authors.forename: Eun Hwa
authors.initials: EH
authors.lastname: Choi
authors.forename: Jong-Tae
authors.initials: JT
authors.lastname: Kim
authors.forename: Joo Heon
authors.initials: JH
authors.lastname: Kim
authors.forename: Soo-Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Eun Young
authors.initials: EY
authors.lastname: Song
authors.forename: Jae Wha
authors.initials: JW
authors.lastname: Kim
authors.forename: Seon-Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Young Il
authors.initials: YI
authors.lastname: Yeom
authors.forename: Ik-Hwan
authors.initials: IH
authors.lastname: Kim
authors.forename: Hee Gu
authors.initials: HG
authors.lastname: Lee
mesh_terms: D002403:Cathepsins / Q000037:antagonists & inhibitors*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D015853:Cysteine Proteinase Inhibitors / Q000235:genetics*; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D007150:Immunohistochemistry; D018021:Lithium Chloride / Q000494:pharmacology; D008297:Male; D020133:Reverse Transcriptase Polymerase Chain Reaction; D055333:Salivary Cystatins / Q000235:genetics*; D013274:Stomach Neoplasms / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism / Q000473:pathology*; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D015853:Cysteine Proteinase Inhibitors; D055333:Salivary Cystatins; D002403:Cathepsins; D018021:Lithium Chloride