title: Novel invasive orthotopic bladder cancer model with high cathepsin B activity resembling human bladder cancer.
abstract: OBJECTIVE
  We developed and characterized an orthotopic invasive bladder tumor model.
  
  
  METHODS
  The MB49-I invasive bladder tumor cell line was obtained after 13 consecutive in vivo passages of primary tumor obtained by subcutaneous inoculation of MB49 bladder tumor cells in C57Bl/6J male mice.
  
  
  RESULTS
  MB49-I tumor local invasiveness, tumor weight and spontaneous metastatic capacity were higher than in MB49 tumors. In MB49-I bladder tumors increased vimentin was observed, suggesting epithelial mesenchymal transition. In vitro the MB49-I cell line showed higher invasive properties associated with an increase in cathepsin B, metalloproteinase 9 and urokinase-type plasminogen activator proteolytic activities. Orthotopic bladder tumors induced by electrocautery of the bladder wall and subsequent instillation of MB49 and MB49-I bladder cancer cells generated superficial and invasive bladder tumors, respectively.
  
  
  CONCLUSIONS
  The new murine bladder model described resembles human bladder disease, making it a useful tool for studying the molecular mechanisms of tumor progression and metastasis, and assaying antimetastatic and anti-invasive agents.
authors.affiliation: Research Area, Institute of Oncology Angel H. Roffo, University of Buenos Aires, Buenos Aires, Argentina.
authors.forename: Catalina
authors.initials: C
authors.lastname: Lodillinsky
authors.forename: Vanina
authors.initials: V
authors.lastname: Rodriguez
authors.forename: Liliana
authors.initials: L
authors.lastname: Vauthay
authors.forename: Eduardo
authors.initials: E
authors.lastname: Sandes
authors.forename: Alberto
authors.initials: A
authors.lastname: Casabé
authors.forename: Ana María
authors.initials: AM
authors.lastname: Eiján
mesh_terms: D000818:Animals; D002401:Cathepsin B / Q000502:physiology*; D045744:Cell Line, Tumor; D004195:Disease Models, Animal; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009361:Neoplasm Invasiveness; D001749:Urinary Bladder Neoplasms / Q000473:pathology*
chemical_list: D002401:Cathepsin B