A novel mechanism of colon carcinoma cell adhesion to the endothelium triggered by beta 1 integrin chain
We have found a monoclonal antibody, called BV7, that rapidly stimulated by 6-10-folds HT-29 colon carcinoma cell adhesion to resting human umbilical vein endothelial cells. This effect was directed to tumor cells and not to endothelial cells and was cell-specific. BV7 was also active on the HCCP-29...
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Published in | The Journal of biological chemistry Vol. 269; no. 8; pp. 6124 - 6132 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Society for Biochemistry and Molecular Biology
25.02.1994
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Subjects | |
Online Access | Get full text |
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Summary: | We have found a monoclonal antibody, called BV7, that rapidly stimulated by 6-10-folds HT-29 colon carcinoma cell adhesion
to resting human umbilical vein endothelial cells. This effect was directed to tumor cells and not to endothelial cells and
was cell-specific. BV7 was also active on the HCCP-2998 but did not change adhesion to endothelial cells of other tumor cells
(MG63 osteosarcoma, A375 melanoma, MHCC-1410 and Lovo colon carcinoma) even if, by flow cytometry, this monoclonal antibody
could bind to them. Additionally, BV7 effect was substratum-specific, since it did not increase but rather blocked HT-29 adhesion
to matrix proteins. Immunoprecipitation analysis and binding to specific transfectants revealed that BV7 recognizes beta 1-subunit
of integrin receptors and antibody blocking experiments showed that alpha 2 beta 1 antibodies were able to counteract BV7
effect on HT-29 adhesion to endothelial cells. In contrast, antibodies directed to other integrins or endothelial adhesive
receptors (E- and P-selectin, VCAM-1, ICAM-1, ICAM-2) were ineffective. Induction of HT-29 adhesion to endothelial cells by
BV7 was Fc- and protein synthesis-independent but required metabolically active cells. The presence of physiological concentrations
of divalent cations and of cytoskeletal integrity was not needed. Comparative studies with eight different prototypic beta
1 antibodies showed that five of them induced HT-29 adhesion to endothelial cells in a way unrelated to their ability to interfere
with HT-29 adhesion to matrix proteins. Cross-blocking binding assays demonstrated that all the five antibodies recognized
a topographically related epitope. Taken together these results provide evidence that beta 1 antibodies may trigger a novel
pathway of HT-29 colon carcinoma adhesion to endothelial cells with different features in respect to other described mechanisms
of tumor cell interaction with the endothelium. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0021-9258 1083-351X |
DOI: | 10.1016/S0021-9258(17)37578-6 |