title: Establishment and characterization of a new cell line of canine inflammatory mammary cancer: IPC-366.
abstract: Canine inflammatory mammary cancer (IMC) shares epidemiologic, histopathological and clinical characteristics with the disease in humans and has been proposed as a natural model for human inflammatory breast cancer (IBC). The aim of this study was to characterize a new cell line from IMC (IPC-366) for the comparative study of both IMC and IBC. Tumors cells from a female dog with clinical IMC were collected. The cells were grown under adherent conditions. The growth, cytological, ultrastructural and immunohistochemical (IHC) characteristics of IPC-366 were evaluated. Ten female Balb/SCID mice were inoculated with IPC-366 cells to assess their tumorigenicity and metastatic potential. Chromosome aberration test and Karyotype revealed the presence of structural aberration, numerical and neutral rearrangements, demonstrating a chromosomal instability. Microscopic examination of tumor revealed an epithelial morphology with marked anysocytosis. Cytological and histological examination of smears and ultrathin sections by electron microscopy revealed that IPC-366 is formed by highly malignant large round or polygonal cells characterized by marked atypia and prominent nucleoli and frequent multinucleated cells. Some cells had cytoplasmic empty spaces covered by cytoplasmic membrane resembling capillary endothelial cells, a phenomenon that has been related to s vasculogenic mimicry. IHC characterization of IPC-366 was basal-like: epithelial cells (AE1/AE3+, CK14+, vimentin+, actin-, p63-, ER-, PR-, HER-2, E-cadherin, overexpressed COX-2 and high Ki-67 proliferation index (87.15 %). At 2 weeks after inoculating the IPC-366 cells, a tumor mass was found in 100 % of mice. At 4 weeks metastases in lung and lymph nodes were found. Xenograph tumors maintained the original IHC characteristics of the female dog tumor. In summary, the cell line IPC-366 is a fast growing malignant triple negative cell line model of inflammatory mammary carcinoma that can be used for the comparative study of both IMC and IBC.
authors: Department of Animal Physiology, Surgery and Pathology, School of Veterinary Medicine, Complutense University of Madrid (UCM), Spain.
authors: Sara
authors: S
authors: Caceres
authors: Department of Animal Medicine, Surgery and Pathology, School of Veterinary Medicine, Complutense University of Madrid (UCM), Spain.
authors: Laura
authors: L
authors: Peña
authors: Department of Animal Medicine, Surgery and Pathology, School of Veterinary Medicine, Complutense University of Madrid (UCM), Spain.
authors: Paloma J
authors: PJ
authors: de Andres
authors: Department of Animal Physiology, Surgery and Pathology, School of Veterinary Medicine, Complutense University of Madrid (UCM), Spain.
authors: Maria J
authors: MJ
authors: Illera
authors: Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States of America.
authors: Mirtha S
authors: MS
authors: Lopez
authors: Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States of America.
authors: Wendy A
authors: WA
authors: Woodward
authors: Department of Hematopathology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States of America.
authors: James M
authors: JM
authors: Reuben
authors: Department of Animal Physiology, Surgery and Pathology, School of Veterinary Medicine, Complutense University of Madrid (UCM), Spain.
authors: Juan C
authors: JC
authors: Illera
mesh_terms: D000818:Animals; D015197:Carcinogenicity Tests; D045744:Cell Line, Tumor; D002869:Chromosome Aberrations; D051546:Cyclooxygenase 2 / Q000378:metabolism; D004283:Dog Diseases / Q000378:metabolism / Q000473:pathology*; D004285:Dogs; D005260:Female; D007150:Immunohistochemistry; D058922:Inflammatory Breast Neoplasms / Q000378:metabolism / Q000473:pathology*; D007621:Karyotyping; D019394:Ki-67 Antigen / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D016513:Mice, SCID; D008854:Microscopy, Electron; D009362:Neoplasm Metastasis; D010641:Phenotype; D014183:Transplantation, Heterologous
chemical_list: D019394:Ki-67 Antigen; D051546:Cyclooxygenase 2