[en] hrombospondin (TSP), a M(r) 450,000 cytoadhesive glycoprotein, has been shown to potentiate tumor cell metastasis in mice by a mechanism that involves the hemostatic system of the host. In this study, the potential involvement of TSP in the interaction of human mammary adenocarcinoma MCF-7 cells with human umbilical vein endothelial cells (HUVECs) in culture was investigated. Using an ELISA, preconfluent HUVECs synthesized 100-fold more TSP than did MCF-7 cells during 24 h of culture (20 versus 0.2 microgram/10(6) cells). Confocal microscopy localized TSP within intercellular junctions between aggregated MCF-7 cells in suspension. On adherent cells, TSP exhibited a patchy distribution both on the cell surface and in the cytosol. In HUVECs, TSP strongly stained the perinuclear space and was also found in association with cytoskeletal microfibrils. Flow cytometric analysis indicated the presence of a large number of unoccupied receptors for TSP on MCF-7 cells. Binding studies using [125I]TSP demonstrated the presence of 1.6 x 10(6) sites/cell with an apparent Kd of 28 nM. Attachment of radiolabeled MCF-7 cells to a TSP-coated substrate and to HUVEC monolayers was inhibited in the presence of a polyclonal antibody to TSP (10 micrograms/ml) or increasing concentrations (1-10 micrograms/ml) of soluble TSP. Neither nonimmune IgG nor the cell adhesion peptide Gly-Arg-Gly-Asp-Ser (100 micrograms/ml) inhibited these interactions. Inhibition was also observed with heparin (10 micrograms/ml), suggesting the participation of TSP heparin-binding domain(s) and heparin-like molecules. In the presence of an excess of soluble TSP or anti-TSP antibody, MCF-7 cells did not form aggregates in suspension and preformed aggregates were readily dissociated by the addition of soluble TSP. These results indicate that mammary adenocarcinoma cells use TSP to form aggregates and to attach to human endothelial cells. These interactions may have physiological implications during the hematogenous spread of tumor cells.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Incardona, F.
Lewalle, J. M.
Morandi, V.
Lambert, S.
Legrand, Y.
Foidart, Jean-Michel ; Université de Liège - ULiège > Département des sciences cliniques > Gynécologie - Obstétrique
Legrand, C.
Language :
English
Title :
Thrombospondin modulates human breast adenocarcinoma cell adhesion to human vascular endothelial cells.
Publication date :
1995
Journal title :
Cancer Research
ISSN :
0008-5472
eISSN :
1538-7445
Publisher :
American Association for Cancer Research, Inc. (AACR), Baltimore, United States - Maryland
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