title: The role of angiostatin in the spontaneous bone and prostate cancers of pet dogs.
abstract: Angiostatin is a potent inhibitor of angiogenesis generated in cancer-bearing hosts by tumor-derived proteases. Because the naturally occurring bone and prostate cancers of pet dogs provide unique model systems to study factors that regulate cancer progression and tumor dormancy, we investigated the capacity of these tumors to generate angiostatin. We determined that angiostatin fragments are present in urine of dogs with bone cancer. The identity of these fragments was confirmed by comparison of the experimentally determined protein sequence to that of a clone of canine angiostatin. Importantly, these fragments were absent in urine collected from the same dogs after complete surgical removal of the primary tumor. We also demonstrate that canine prostate cancer cells are capable of processing plasminogen to angiostatin in vitro. These findings provide rationale for using spontaneous canine tumor models to isolate endogenous angiogenesis inhibitors and to investigate their therapeutic use against cancer.
authors.affiliation: Surgical Research Laboratory, Children's Hospital, 300 Longwood Avenue, Boston, Massachusetts 02115, USA. shepherd@attenuon.com
authors.forename: S R
authors.initials: SR
authors.lastname: Pirie-Shepherd
authors.forename: K T
authors.initials: KT
authors.lastname: Coffman
authors.forename: D
authors.initials: D
authors.lastname: Resnick
authors.forename: R
authors.initials: R
authors.lastname: Chan
authors.forename: O
authors.initials: O
authors.lastname: Kisker
authors.forename: J
authors.initials: J
authors.lastname: Folkman
authors.forename: D J
authors.initials: DJ
authors.lastname: Waters
mesh_terms: D043168:Angiostatins; D000818:Animals; D000918:Antibody Specificity; D001859:Bone Neoplasms / Q000378:metabolism / Q000662:veterinary*; D002417:Cattle; D002455:Cell Division / Q000187:drug effects; D018450:Disease Progression; D004283:Dog Diseases / Q000378:metabolism*; D004285:Dogs; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects; D008297:Male; D008969:Molecular Sequence Data; D012516:Osteosarcoma / Q000378:metabolism / Q000662:veterinary*; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics / Q000378:metabolism* / Q000652:urine; D010958:Plasminogen / Q000737:chemistry / Q000235:genetics / Q000378:metabolism* / Q000652:urine; D011471:Prostatic Neoplasms / Q000378:metabolism / Q000473:pathology / Q000662:veterinary*; D017386:Sequence Homology, Amino Acid; D014407:Tumor Cells, Cultured
chemical_list: D010446:Peptide Fragments; D043168:Angiostatins; D010958:Plasminogen