Abstract
Four new pairs of canine mammary carcinoma cell lines derived from both primary and metastatic lesions were established. The cells were cultured in RPMI-1640 with 10% fetal bovine serum and they showed stable growth for more than 120 passages. Using these cell lines, the expression of E-cadherin was measured by flow cytometry and the function of E-cadherin was evaluated by cell aggregation assay and results from the primary and metastatic lesions were compared statistically. E-cadherin was strongly expressed in all of the cell lines, without a notable difference between cells of primary and metastatic origin. In the cell aggregation assay, the function of E-cadherin was significantly weaker in the cells of primary origin (p < 0.05), as compared with cells of metastatic origin. The present results suggest that a reduction in E-cadherin function may be implicated in the invasive and metastatic potential of canine mammary tumour cells; however, further study will be needed to clarify E-cadherin function in the context of the metastasis of canine mammary carcinoma.
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