title: Expression of secreted frizzled-related protein 2 in a primary canine mammary tumor cell line: a candidate tumor marker for mammary tumor cells.
abstract: Canine mammary tumors (CMTs) have been proposed to be a good animal model for human breast cancer. To provide a basis for the tumorigenic study of CMTs, cell lines were established using a modified cell culture technique. The epithelial morphology and immunostaining with cytokeratin 18 confirmed the epithelial origin of the cells. In an investigation of possible mammary tumorigenesis-related factors, the expression of Wnt signaling-related proteins was detected in cell lines. Secreted frizzled-related protein 2 (SFRP2) was abundantly expressed in CMT cells but not in normal canine mammary gland (MG) cells. Secreted frizzled-related protein 2 was secreted into the culture medium and was associated with the extracellular matrix. In addition, increased expressions of beta-catenin and cyclin D1 were observed in cells overexpressing SFRP2. The marked differential expression of SFRP2 reveals that this protein may be a potential candidate marker for CMTs. The CMT cell line established in this study provides a useful tool and experimental model for understanding both the tumorigenesis of CMTs and the role of Wnt signaling in cancers.
authors.affiliation: Graduate Institute of Veterinary Medicine, National Taiwan University, Taipei 106, Taiwan, Republic of China.
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: Lee
authors.forename: Ching-Jin
authors.initials: CJ
authors.lastname: Chang
authors.forename: Ling-Ling
authors.initials: LL
authors.lastname: Chueh
authors.forename: Chung-Tien
authors.initials: CT
authors.lastname: Lin
mesh_terms: D000818:Animals; D001943:Breast Neoplasms; D018929:Cell Culture Techniques / Q000379:methods*; D045744:Cell Line, Tumor; D019938:Cyclin D1 / Q000378:metabolism; D003598:Cytoskeletal Proteins / Q000378:metabolism; D004195:Disease Models, Animal; D004285:Dogs; D004847:Epithelial Cells / Q000378:metabolism*; D005109:Extracellular Matrix / Q000378:metabolism; D005260:Female; D015151:Immunoblotting; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D007633:Keratins; D008321:Mammary Glands, Animal / Q000166:cytology*; D008565:Membrane Proteins / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000502:physiology*; D015534:Trans-Activators / Q000378:metabolism; D051153:Wnt Proteins; D051176:beta Catenin
chemical_list: D003598:Cytoskeletal Proteins; D008565:Membrane Proteins; D011518:Proto-Oncogene Proteins; D015534:Trans-Activators; D051153:Wnt Proteins; D051176:beta Catenin; D019938:Cyclin D1; D007633:Keratins