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• W2023942550 abstract "Over-expression of the HER2/neu (HER2) proto-oncogene in breast carcinoma imparts an enhanced metastatic potential. Metastasis requires escape of the tumor cell from the vasculature into subjacent tissue, a transmigration event across an endothelial cell (EC) monolayer. EC retraction has been reported to precede transmigration in several tumor metastatic models. Using intact human iliac vein EC monolayers, we tested the abilities of MCF-7 breast cancer cells and HER cells, a transfected MCF-7 line over-expressing HER2, to induce EC retraction. We further analyzed whether HER2 signaling influenced cancer cell-induced EC retraction. MCF-7 or HER cells were co-cultured onto mature EC monolayers. More HER than MCF-7 cells induced EC retraction (76 +/- 19% vs. 17 +/- 12%, p < 0.001) with resultant exposure of subendothelial matrix (6.80 +/- 2.86% vs. 0.85 +/- 0.39%, p < 0.001). Blockade of HER2 signaling using Herceptin nearly eliminated EC retraction (p < 0.01), while stimulation of HER2 using heregulin-beta1-augmented EC retraction (p < 0.05). Further, there was no difference between cell lines in either the number of cells adhered or the strength of adherence to EC under shear stress. These data suggest that HER2 signaling enhances metastasis in breast cancer cells by inducing EC retraction, a process that appears to precede endothelial transmigration." @default.
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• W2023942550 date "2001-02-01" @default.
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• W2023942550 title "HER2neu over‐expression induces endothelial cell retraction" @default.
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• W2023942550 doi "https://doi.org/10.1002/1097-0215(200002)9999:9999<::aid-ijc1061>3.0.co;2-y" @default.
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