title: The effect of collagenase and hyaluronidase on transient perfusion in human osteosarcoma xenografts grown orthotopically and in dorsal skinfold chambers.
abstract: BACKGROUND
  Collagenase and hyaluronidase are enzymes which degrade the extracellular matrix and increase the uptake and improve the distribution of therapeutic macromolecules in tumours. The purpose of the present work was to investigate whether collagenase or hyaluronidase had any effects on transient perfusion and/or changes in vascular areas.
  
  
  METHODS
  The effects were studied in human osteosarcomas in BALB/c nu/nu mice growing orthotopically around and infiltrating the femurs, and in dorsal skinfold chambers using confocal laser scanning microscopy.
  
  
  RESULTS
  Both collagenase and hyaluronidase reduced the number of vessels that closed, but only collagenase increased the number of vessels which opened up, i.e. both enzymes improved the perfusion but collagenase to a greater extent than hyaluronidase.
  
  
  CONCLUSIONS
  Destroying the structural protein network seems to be more efficient than degrading the gel of hyaluronan with respect to increase perfusion.
authors.affiliation: Department of Physics, The Norwegian University of Science and Technology, Trondheim, Norway. ingunn.tufto@phys.ntnu.no
authors.forename: Ingunn
authors.initials: I
authors.lastname: Tufto
authors.forename: Robert
authors.initials: R
authors.lastname: Hansen
authors.forename: David
authors.initials: D
authors.lastname: Byberg
authors.forename: Kirsten H H
authors.initials: KH
authors.lastname: Nygaard
authors.forename: Jarle
authors.initials: J
authors.lastname: Tufto
authors.forename: Catharina de L
authors.initials: Cde L
authors.lastname: Davies
mesh_terms: D000818:Animals; D001859:Bone Neoplasms / Q000098:blood supply*; D002196:Capillaries / Q000187:drug effects / Q000648:ultrastructure; D017364:Collagenases / Q000494:pharmacology*; D005260:Female; D006801:Humans; D006821:Hyaluronoglucosaminidase / Q000494:pharmacology*; D051379:Mice; D008807:Mice, Inbred BALB C; D018613:Microscopy, Confocal; D012516:Osteosarcoma / Q000098:blood supply*; D010477:Perfusion; D012039:Regional Blood Flow / Q000187:drug effects; D023041:Xenograft Model Antitumor Assays
chemical_list: D006821:Hyaluronoglucosaminidase; D017364:Collagenases