CUB Domain Containing Protein 1 (CDCP1) modulates adhesion and motility in colon cancer cells

BMC Cancer

David J Orchard-Webb²  Thong Chuan Lee²  Graham P Cook¹  G Eric Blair³ 

[1] Leeds Institute of Cancer and Pathology, Wellcome Brenner Building, St. James’s University Hospital, University of Leeds, Leeds LS9 7TF, UK

[2] School of Molecular and Cellular Biology, Garstang Building, University of Leeds, Leeds LS2 9JT, UK

[3] School of Molecular and Cellular Biology, Faculty of Biological Sciences, Garstang Building, Room 8.53f, University of Leeds, Leeds LS2 9JT, UK

关键词: Adhesion;    Motility;    CD9;    CDCP1;   

Others  :  1120986
DOI  :  10.1186/1471-2407-14-754

 received in 2014-04-16, accepted in 2014-10-02,  发布年份 2014

【 摘 要 】

Background

Deregulated expression of the transmembrane glycoprotein CDCP1 (CUB domain-containing protein-1) has been detected in several cancers including colon, lung, gastric, breast, and pancreatic carcinomas. CDCP1 has been proposed to either positively or negatively regulate tumour metastasis. In this study we assessed the role of CDCP1 in properties of cells that are directly relevant to metastasis, namely adhesion and motility. In addition, association between CDCP1 and the tetraspanin protein CD9 was investigated.

Methods

CDCP1 and CD9 protein expression was measured in a series of colon cancer cell lines by flow cytometry and Western blotting. Adhesion of Colo320 and SW480 cells was determined using a Matrigel adhesion assay. The chemotactic motility of SW480 cells in which CDCP1 expression had been reduced by RNA interference was analysed using the xCELLigence system Real-Time Cell Analyzer Dual Plates combined with 8 μm pore filters. Detergent-resistant membrane fractions were generated following density gradient centrifugation and the CDCP1 and CD9 protein composition of these fractions was determined by Western blotting. The potential association of the CDCP1 and CD9 proteins was assessed by co-immunoprecipitation.

Results

Engineered CDCP1 expression in Colo320 cells resulted in a reduction in cell adhesion to Matrigel. Treatment of SW480 cells with CDCP1 siRNA reduced serum-induced chemotaxis. CDCP1 and CD9 cell-surface protein and mRNA levels showed a positive correlation in colon cancer cell lines and the proteins formed a low-level, but detectable complex as judged by co-sedimentation of detergent lysates of HT-29 cells in sucrose gradients as well as by co-immunoprecipitation in SW480 cell lysates.

Conclusions

A number of recent studies have assigned a potentially important role for the cell-surface protein CDCP1 in invasion and metastasis of a several types of human cancer cells. In this study, CDCP1 was shown to modulate cell-substratum adhesion and motility in colon cancer cell lines, with some variation depending on the colon cancer cell type. CDCP1 and CD9 were co-expressed at the mRNA and protein level and we obtained evidence for the presence of a molecular complex of these proteins in SW480 colon cancer cells.

【 授权许可】

   
2014 Orchard-Webb et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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