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• W2023994044 abstract "Osteosarcomas and rhabdomyosarcomas are vigorously invading tumors. Before they can extravasate to the parenchymal organs and form metastases, they have to adhere to the endothelial cells lining the blood vessels and then penetrate through the endothelium. We show that several human sarcoma cell lines, osteosarcomas HOS, MG-63, U2-OS, and a rhabdomyosarcoma RD, express VLA-4 molecule on their surface and bind to the VCAM-1 -expressing activated endothelial cell line Ea.hy 926. The increased sarcoma-cell adhesion could be abolished by treating the sarcoma cells with monoclonal antibodies (MAbs) VLA4 (both α- and β-chain, HP2/1 and 4B4 respectively) or treating endothelial cells with VCAM-1 antibody (4B9). Furthermore, we show that sarcoma cells adhere to recombinant soluble VCAM-1 protein. On the other hand, these sarcoma cell lines do not express marked amounts of other ligands (such as CD11/18 or sialyl-Lex) for other endothelial adhesion molecules (ICAM-1, ICAM-2, E- and P-selectin) indicating that the VLA-4-VCAM-1 dependent pathway might be of major importance in sarcoma extravasation. VLA-4 is not always in an avid form and therefore the expression of VLA-4 does not directly predict adherence to VCAM-1. The avidity of VLA-4 (measured by adherence to soluble VCAM-1) of MG-63 and U2-OS cells could be increased by a 30-min PMA treatment, whereas the avidity of VLA-4 on HOS cells increased only after 48 hr of PMA induction. Our results show that sarcoma cell lines (HOS, MG-63, U2-OS and RD) adhere to stimulated endothelium via VLA-4-VCAM-1 adhesion molecules and that VLA-4 avidity on sarcoma cells can be differentially modulated by PMA. © 1992 Wiley-Liss, Inc." @default.
• W2023994044 created "2016-06-24" @default.
• W2023994044 creator A5001822701 @default.
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• W2023994044 date "1992-12-02" @default.
• W2023994044 modified "2023-10-18" @default.
• W2023994044 title "VLA-4 integrin on sarcoma cell lines recognizes endothelial VCAM-1. Differential regulation of the VLA-4 avidity on various sarcoma cell lines" @default.
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• W2023994044 doi "https://doi.org/10.1002/ijc.2910520615" @default.
• W2023994044 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1281143" @default.
• W2023994044 hasPublicationYear "1992" @default.
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