title: Expression of cyclooxygenase-1 and 2 in naturally-occurring canine cancer.
abstract: The purpose of this work was to determine cox-1 and cox-2 expression by immunohistochemistry in forms of naturally occurring canine cancer in order to identify animal systems for pre-clinical evaluation of cox inhibitors and cox-2 inhibitors in cancer. Canine lymphoma (LSA), prostatic carcinoma (PCA), osteosarcoma (OSA), oral melanoma (MEL), oral squamous cell carcinoma (SCC), oral fibrosarcoma (FSA), mammary carcinoma (MCA), and normal tissues were included. Cox-2 was expressed in epithelial tumors (17 of 26 SCC, 8 of 13 MCA, 5 of 9 PCA cases) and MEL (9 of 15 cases), but was generally absent in normal tissues. Cox-2 expression was minimal or absent in mesenchymal tumors and LSA. Cox-1 was expressed in normal epithelial tissues and in some osteoclast and osteoblast in bone, but was absent in normal lymph node. In conclusion, forms of canine cancer were identified for in vivo studies of the effects of cox inhibitors and selective cox-2 inhibitors on cancer.
authors.affiliation: Department of Veterinary Pathobiology, Purdue University, West Lafayette, IN 47907, USA. mohammes@purdue.edu
authors.forename: S I
authors.initials: SI
authors.lastname: Mohammed
authors.forename: K N M
authors.initials: KN
authors.lastname: Khan
authors.forename: R S
authors.initials: RS
authors.lastname: Sellers
authors.forename: M G
authors.initials: MG
authors.lastname: Hayek
authors.forename: D B
authors.initials: DB
authors.lastname: DeNicola
authors.forename: L
authors.initials: L
authors.lastname: Wu
authors.forename: P L
authors.initials: PL
authors.lastname: Bonney
authors.forename: D W
authors.initials: DW
authors.lastname: Knapp
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000378:metabolism; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000627:therapeutic use; D004283:Dog Diseases / Q000188:drug therapy / Q000378:metabolism*; D004285:Dogs; D004848:Epithelium / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic; D007527:Isoenzymes / Q000096:biosynthesis*; D008198:Lymph Nodes / Q000378:metabolism; D009369:Neoplasms / Q000188:drug therapy / Q000378:metabolism* / Q000662:veterinary*; D010006:Osteoblasts / Q000378:metabolism; D010010:Osteoclasts / Q000378:metabolism; D011451:Prostaglandin-Endoperoxide Synthases / Q000096:biosynthesis*
chemical_list: D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D007527:Isoenzymes; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D011451:Prostaglandin-Endoperoxide Synthases