Summary
Five spontaneous canine mammary tumors were cultured in vitro and cell lines were established. The tumors included three frozen carcinomas, fine-needle aspirate from one fresh carcinoma, and one fresh atypical benign mixed tumor. The cell lines have so far been cultured for about 2 yr and passaged between 45 and 200 times. The cell lines expressed different types of intermediate filaments, including a heterogenous pattern. In some cases no intermediate filaments were expressed. Ultrastructure studies showed epithelial cells and cells intermediate between epithelial and myoepithelial types. Retrovirus associated A-particles were found in two carcinomas. The mixed mammary tumor cell line formed ductlike structures in collagen substrate. The cell lines grew when inoculated s.c. into male nude mice. Two carcinomas caused lymph node metastases in two mice and another carcinoma single lung metastases in one tested mouse. DNA hypodiploidy, studied by flow cytometry, in one of the primary carcinoma was retained in vitro, and this cell line showed polyploidy during later passages. The other cell lines had a more unstable DNA profile, although a tendency for polyploidy was found. These findings were also illustrated in chromosome studies.
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HellmÉn, E. Characterization of four in vitro established canine mammary carcinoma and one atypical benign mixed tumor cell lines. In Vitro Cell Dev Biol - Animal 28, 309–319 (1992). https://doi.org/10.1007/BF02877054
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DOI: https://doi.org/10.1007/BF02877054