Gangliosides expressed on breast cancer cells are E-selectin ligands.

Abstract:

:Cancer cell adhesion to vascular endothelium is a critical process in hematogenous metastasis. We hypothesized that breast cancer cells express ligands that bind under blood flow conditions to E-selectin expressed by endothelial cells. At a hemodynamic wall shear rate, BT-20 and MDA-MB-468 breast cancer cells adhered to cytokine-activated human umbilical cord vein endothelial cells (HUVECs) but not to anti-E-selectin monoclonal antibody treated HUVECs, demonstrating that adhesion was specifically mediated by E-selectin. Characterization of glycans expressed on breast cancer cells by a panel of antibodies revealed that BT-20 cells expressed sialyl Lewis X (sLe(x)) and sialyl Lewis A (sLe(a)) but MDA-MB-468 cells did not, suggesting that the former possess classical glycans involved in E-selectin mediated adhesion while the latter have novel binding epitopes. Protease treatment of the breast cancer cells failed to significantly alter the carbohydrate expression profiles, binding to soluble E-selectin-Ig chimera, or the ability of the cells to tether and roll on E-selectin expressed by HUVECs, indicating that glycosphingolipids are functional E-selectin ligands on these cells. Furthermore, extracted breast cancer cell gangliosides supported binding of E-selectin-Ig chimera and adhesion of E-selectin transfected cells under physiological flow conditions. In summary, our results demonstrate that breast cancer cells express sialylated glycosphingolipids (gangliosides) as E-selectin ligands that may be targeted for prevention of metastasis.

authors

Shirure VS,Henson KA,Schnaar RL,Nimrichter L,Burdick MM

doi

10.1016/j.bbrc.2011.02.061

subject

Has Abstract

pub_date

2011-03-18 00:00:00

pages

423-9

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(11)00253-1

journal_volume

406

pub_type

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