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Yoshimura H, Kimura-Tsukada N, Ono Y, Michishita M, Ohkusu-Tsukada K, Matsuda Y, Ishiwata T, Takahashi K. Characterization of Spontaneous Mammary Tumors in Domestic Djungarian Hamsters (Phodopus sungorus). Vet Pathol 2015; 52:1227-34. [DOI: 10.1177/0300985815583097] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Mammary tumors that spontaneously occurred in domestic Djungarian hamsters ( Phodopus sungorus) were histologically examined. Forty-five mammary tumors included 14 adenomas, 18 adenocarcinomas, 1 lipid-rich carcinoma, 2 adenoacanthomas, 2 malignant adenomyoepitheliomas, 1 benign mixed tumor, and 7 “balloon cell” carcinosarcomas. The latter 4 types were newly recognized neoplasms in Djungarian hamsters. The relatively high incidence of spontaneous mammary carcinosarcomas in domestic Djungarian hamsters is intriguing. Carcinosarcomas exhibited anomalous histological features made up of a mixture of glandular cells, polygonal cells (including “balloon cells”), and sarcomatous spindle cells in varying proportions. Transitional features from glandular cells to polygonal cells and subsequently to sarcomatous spindle cells were observed. Using immunohistochemistry, we observed that glandular cells exhibited an epithelial phenotype (cytokeratin(+)/vimentin(–)), spindle cells exhibited a mesenchymal phenotype (cytokeratin(–)/vimentin(+)), and polygonal cells exhibited an intermediate phenotype (cytokeratin(+)/vimentin(+)). Reduction or loss of β-catenin expression and gain of S100A4 expression were observed in polygonal and spindle cells. The polygonal cell population included a varying number of characteristic cells that were expanded by large intracytoplasmic vacuoles. Electron microscopy revealed that these “balloon cells” had large cytoplasmic lumens lined by microvilli. These observations suggest that epithelial-mesenchymal transition may account for the pathogenesis of mammary carcinosarcomas in Djungarian hamsters.
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Affiliation(s)
- H. Yoshimura
- Division of Physiological Pathology, Department of Applied Science, School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo, Japan
- Department of Veterinary Pathology, School of Veterinary medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - N. Kimura-Tsukada
- Department of Veterinary Pathology, School of Veterinary medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - Y. Ono
- Department of Veterinary Pathology, School of Veterinary medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - M. Michishita
- Department of Veterinary Pathology, School of Veterinary medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - K. Ohkusu-Tsukada
- Department of Veterinary Pathology, School of Veterinary medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
| | - Y. Matsuda
- Department of Pathology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Tokyo, Japan
| | - T. Ishiwata
- Department of Integrated Diagnostic Pathology, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan
| | - K. Takahashi
- Department of Veterinary Pathology, School of Veterinary medicine, Nippon Veterinary and Life Science University, Tokyo, Japan
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Tei M, Uchida K, Chambers JK, Harada H, Takahashi M, Nishimura R, Watanabe M, Nakayama H. Mammary lipid-rich carcinoma with extensive amyloid deposition in a dog. J Vet Med Sci 2012; 74:809-11. [PMID: 22261147 DOI: 10.1292/jvms.11-0482] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A 6-year-old female Labrador retriever presented with a mass in the right mammary gland, and swollen right inguinal and axillary lymph nodes. Fine needle aspiration biopsy suggested a malignant lipid-producing tumor, such as liposarcoma. Histopathologically, the neoplasms were solid, lobulated nests of atypical epithelial cells with a large amount of extracellular deposits of amyloid in both mammary gland and lymph nodes. The proliferating cells contained large cytoplasmic vacuoles, positive for oil red-O. These cells were immunopositive for cytokeratin (AE1/AE3) and β-casein and negative for SMA. The amyloid deposits were immunopositive for β-casein. These findings suggested that the proliferating cells secreted β-casein forming amyloid deposits. This is the first report of mammary lipid-rich carcinoma with extensive amyloid deposition derived from β-casein.
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Affiliation(s)
- Meina Tei
- Department of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
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