PMID: 15387376Sep 25, 2004Paper

Adhesion of HT-29 colon carcinoma cells to endothelial cells requires sequential events involving E-selectin and integrin beta4

Clinical & Experimental Metastasis
J LaferriereJacques Huot

Abstract

HT-29 colon carcinoma cells attach to TNFalpha-activated human umbilical vein endothelial cells (HUVECs) by their specific binding to E-selectin. This interaction activates, in the cancer cells, the MAPK SAPK2/p38, which leads to their transendothelial migration (Laferrière et al., J Biol Chem 2001; 276: 33762). In this study, we investigated the role of E-selectin in activating integrins to modulate adhesion and regulate integrin-mediated events. Blocking the integrins from HT-29 cells (alpha2, alpha3, alpha6, alphav/beta5, beta1 and beta4) with specific antibodies revealed a role for beta4 integrin in their adhesion to TNFalpha-treated HUVEC. The beta4 integrin-dependent adhesion was maximal after 30 min, whereas the-E-selectin-dependent adhesion was maximal after 15 min. Integrin beta4 became quickly phosphorylated upon addition of HT-29 cells to endothelial cells and the effect was independent of the expression of E-selectin. Moreover, a recombinant E-selectin/Fc chimera did not induce the phosphorylation of beta4. The phosphorylation of beta4 is not required for adhesion since adhesion was not affected in HT-29 cells that express a truncated form of beta4 that is deleted from its cytoplasmic phosphorylatable domain. Howeve...Continue Reading

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