Integrin-linked kinase regulates cell proliferation and tumour growth in murine colitis-associated carcinogenesis.

Abstract:

BACKGROUND:Integrins are transmembrane cell surface receptors that mediate cell-cell and cell-matrix contacts. Integrin-linked kinase (ILK) is the binding partner of beta1 and beta3 integrins, and has been ascribed essential roles in development, angiogenesis and tumourigenesis. However, in vivo evidence for the latter is currently lacking. AIM:The hypothesis that epithelial cell-specific deletion of ILK would impact on murine tumourigenesis was tested using a colitis-associated cancer model. METHODS:To create intestinal epithelial cell ILK knockout animals, Fabp/Cre mice (Cre recombinase expressed under the control of a modified Fabp promoter) were used, and they were mated with mice carrying a loxP-flanked (floxed) ILK gene (ILK(flox/flox)). RESULTS:ILK intestinal knockout mice exhibited a reduction in the size of the caecum, and reduced crypt height in the colon. Immunohistochemical analysis confirmed that there was diminished ILK expression, and bromodeoxyuridine (BrdU) staining was significantly reduced in the knockout animals as compared with the wild-type animals in both the caecum and colon (p<0.001 for both). Following azoxymethane and dextran sodium sulfate (DSS) treatment, fewer total tumours were observed in the ILK knockout animals, which were mosaic with respect to ILK expression. Cyclin D1, Snail, fibronectin and matrix metalloproteinase 9 (MMP9) were all reduced, and active caspase 3 increased, in tumours from ILK knockout mice, as compared with wild-type mice, on immunohistochemical analysis. Using small interfering RNA (siRNA) to knock down ILK in colonic cancer cell lines, it was confirmed that it is capable of regulating cyclin D1, Snail, MMP9 and fibronectin transcription. CONCLUSIONS:From these findings, it is concluded that ILK plays an important role in intestinal epithelial cell proliferation, and that it influences the development of colitis-associated cancer, through modulation of cyclin D1, the extracellular matrix and MMP9.

journal_name

Gut

journal_title

Gut

authors

Assi K,Mills J,Owen D,Ong C,St Arnaud R,Dedhar S,Salh B

doi

10.1136/gut.2007.142778

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

931-40

issue

7

eissn

0017-5749

issn

1468-3288

pii

gut.2007.142778

journal_volume

57

pub_type

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