title: Two-photon intravital multicolor imaging combined with inducible gene expression to distinguish metastatic behavior of breast cancer cells in vivo.
abstract: OBJECTIVE
  The aim of this study is to use multicolor intravital imaging together with an inducible cell model to compare metastatic behavior of control and genetically modified breast cancer cell populations within the intact primary tumor of a mouse.
  
  
  METHODS
  GFP-MTLn3-ErbB1 cells were generated with doxycycline-regulated conditional transgene expression using lentiviral TREAutoR3-cyan fluorescent protein (CFP). CFP expression together with tumor cell motility is monitored in vitro and in vivo.
  
  
  RESULTS
  Effective and tight control of doxycycline-induced CFP expression was observed both in vitro and in vivo. Intravital multiphoton microscopy on intact orthotopic tumors allowed a clear discrimination between GFP-only and (GFP + CFP) cell populations, which enables direct comparison of the motility behavior of two different cell populations in the same microenvironment in vivo.
  
  
  CONCLUSIONS
  This system is robust and versatile for conditional gene expression and can be used to study the role of individual candidate metastasis genes in vitro and in vivo. This technology will allow investigations of cellular events in cancer metastasis and in particular intravasation within a primary tumor.
authors.affiliation: Division of Toxicology, Leiden Amsterdam Center for Drug Research (LACDR), Leiden University, Leiden, The Netherlands.
authors.forename: Sylvia E
authors.initials: SE
authors.lastname: Le Dévédec
authors.forename: Reshma
authors.initials: R
authors.lastname: Lalai
authors.forename: Chantal
authors.initials: C
authors.lastname: Pont
authors.forename: Hans
authors.initials: H
authors.lastname: de Bont
authors.forename: Bob
authors.initials: B
authors.lastname: van de Water
mesh_terms: D000818:Animals; D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology; D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D004318:Doxycycline / Q000494:pharmacology; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D051379:Mice; D018345:Mice, Knockout; D008853:Microscopy / Q000379:methods*; D009362:Neoplasm Metastasis / Q000235:genetics*
chemical_list: D004318:Doxycycline
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