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Open Access Highly Accessed Research article

Survival advantages conferred to colon cancer cells by E-selectin-induced activation of the PI3K-NFκB survival axis downstream of Death receptor-3

Nicolas Porquet12, Andrée Poirier1, François Houle1, Anne-Laure Pin1, Stéphanie Gout13, Pierre-Luc Tremblay14, Éric R Paquet1, Roscoe Klinck5, François A Auger4 and Jacques Huot1*

Author Affiliations

1 Le Centre de recherche en cancérologie de l'Université Laval et Centre de recherche du CHUQ, l'Hôtel-Dieu de Québec, 9 rue McMahon, Québec G1R 2J6 Canada

2 Institute of Developmental Biology and Cancer, CNRS UMR6543, Université Nice Sophia Antipolis 06108 Nice Cedex 2, France

3 Centre de recherche Inserm/UJF U823 Equipe 2, Institut Albert Bonniot BP 170, 38052 Grenoble Cedex 09, France

4 Laboratoire d'Organogenèse Expérimentale, Centre hospitalier affilié Universitaire de Québec, 1401, 18erue Québec, G1J 1Z4, Canada

5 Laboratoire de Génomique Fonctionnelle de l'Université de Sherbrooke, 3201, rue Jean Mignault, Sherbrooke J1E 4K8 Canada

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BMC Cancer 2011, 11:285  doi:10.1186/1471-2407-11-285

Published: 1 July 2011

Abstract

Background

Extravasation of circulating cancer cells is a key event of metastatic dissemination that is initiated by the adhesion of cancer cells to endothelial cells. It requires interactions between adhesion receptors on endothelial cells and their counter-receptors on cancer cells. Notably, E-selectin, a major endothelial adhesion receptor, interacts with Death receptor-3 present on metastatic colon carcinoma cells. This interaction confers metastatic properties to colon cancer cells by promoting the adhesion of cancer cells to endothelial cells and triggering the activation of the pro-migratory p38 and pro-survival ERK pathways in the cancer cells. In the present study, we investigated further the mechanisms by which the E-selectin-activated pathways downstream of DR3 confer a survival advantage to colon cancer cells.

Methods

Cell survival has been ascertained by using the WST-1 assay and by evaluating the activation of the PI3 kinase/NFκB survival axis. Apoptosis has been assayed by determining DNA fragmentation by Hoechst staining and by measuring cleavage of caspases-8 and -3. DR3 isoforms have been identified by PCR. For more precise quantification, targeted PCR reactions were carried out, and the amplified products were analyzed by automated chip-based microcapillary electrophoresis on an Agilent 2100 Bioanalyzer instrument.

Results

Interaction between DR3-expressing HT29 colon carcinoma cells and E-selectin induces the activation of the PI3K/Akt pathway. Moreover, p65/RelA, the anti-apoptotic subunit of NFκB, is rapidly translocated to the nucleus in response to E-selectin. This translocation is impaired by the PI3K inhibitor LY294002. Furthermore, inhibition of the PI3K/Akt pathway increases the cleavage of caspase 8 in colon cancer cells treated with E-selectin and this effect is still further increased when both ERK and PI3K pathways are concomitantly inhibited. Intriguingly, metastatic colon cancer cell lines such as HT29 and SW620 express higher levels of a splice variant of DR3 that has no trans-membrane domain and no death domain.

Conclusion

Colon cancer cells acquire an increased capacity to survive via the activation of the PI3K/NFκB pathway following the stimulation of DR3 by E-selectin. Generation of a DR3 splice variant devoid of death domain can further contribute to protect against apoptosis.

Keywords:
Death receptor-3; E-selectin; colon cancer; PI3 kinase; splice variant