Inhibitory Effect of Fucoidan on the Adhesion of Adenocarcinoma Cells to Fibronectin
Fucoidans inhibit tumour cell adhesion to various substrata, but their mechanisms of action are not fully understood. Using 3 H-fucoidan, we observed that fucoidan binds to fibronectin, this binding being saturable and sensitive to ionic strength and pH. The interaction occurred on at least four dif...
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Published in | Anticancer research Vol. 25; no. 3B; pp. 2129 - 2133 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Attiki
International Institute of Anticancer Research
01.05.2005
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Subjects | |
Online Access | Get full text |
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Summary: | Fucoidans inhibit tumour cell adhesion to various substrata, but their mechanisms of action are not fully understood. Using
3 H-fucoidan, we observed that fucoidan binds to fibronectin, this binding being saturable and sensitive to ionic strength and
pH. The interaction occurred on at least four different sites along the polypeptide chain, two of them being the heparin-binding
sequences. Moreover, when MDA-MB-231 tumour cells were exposed to DTAF-fucoidan, internalization occurred and punctuated vesicles
were observed in the perinuclear region. The treated cells also showed a different morphology with a cytoskeleton devoid of
vinculin and a reorganiztion of the repartition of the integrin-α5 subunit on the cell surface. Based on these data, we hypothesize
that fucoidan inhibits the adhesion of MDA-MB-231 cells to fibronectin i) by blocking the protein's heparin- and cell-binding
domains, ii) by modulating the reorganization of the integrin α5 subunit and iii) by down-regulating the expression of vinculin. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0250-7005 1791-7530 |