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International Journal of Colorectal Disease

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01-06-2007 | Original Article

Differential expression of genes encoding tight junction proteins in colorectal cancer: frequent dysregulation of claudin-1, -8 and -12

Authors: J. Gröne, B. Weber, E. Staub, M. Heinze, I. Klaman, C. Pilarsky, K. Hermann, E. Castanos-Velez, S. Röpcke, B. Mann, A. Rosenthal, H. J. Buhr

Published in: International Journal of Colorectal Disease | Issue 6/2007

Abstract

Background and aims

As integral membrane proteins, claudins form tight junctions together with occludin. Several claudins were shown to be up-regulated in various cancer types. We performed an expression analysis of genes encoding tight junction proteins to display differential gene expression on RNA and protein level and to identify and validate potential targets for colorectal cancer (CRC) therapy.

Patients and methods

Amplified and biotinylated cRNA from 30 microdissected CRC specimen and corresponding normal tissues was hybridized to Affymetrix U133set GeneChips. Quantification of differential protein expression of claudin-1, -8 and -12 between normal and corresponding tumour tissues was performed by Western blot analyses. Paraffin-embedded CRC tissue samples, colon cancer cell lines and normal tissue microarray were analysed for protein expression of claudin-1 by immunohistochemistry (IHC).

Results

Claudin-1 (CLDN1) and -12 (CLDN12) are frequently overexpressed in CRC, whereas claudin-8 (CLDN8) shows down-regulation in tumour tissue on RNA level. Quantification of proteins confirmed the overexpression of claudin-1 in tumour tissues, whereas changes of claudin-8 and -12 were not significantly detectable on protein level. IHC confirmed the markedly elevated expression level of claudin-1 in the majority of CRC, showing membranous and intracellular vesicular staining.

Conclusions

Differential expression of genes encoding claudins in CRC suggests that these tight junction proteins may be associated to and involved in tumorigenesis. CLDN1 is frequently up-regulated in large proportion of CRC and may represent potential target molecule for blocking studies in CRC.

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Title: Differential expression of genes encoding tight junction proteins in colorectal cancer: frequent dysregulation of claudin-1, -8 and -12
Authors: J. Gröne
B. Weber
E. Staub
M. Heinze
I. Klaman
C. Pilarsky
K. Hermann
E. Castanos-Velez
S. Röpcke
B. Mann
A. Rosenthal
H. J. Buhr
Publication date: 01-06-2007
Publisher: Springer-Verlag
Published in: International Journal of Colorectal Disease / Issue 6/2007
Print ISSN: 0179-1958
Electronic ISSN: 1432-1262
DOI: https://doi.org/10.1007/s00384-006-0197-3

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Differential expression of genes encoding tight junction proteins in colorectal cancer: frequent dysregulation of claudin-1, -8 and -12

Abstract

Background and aims

Patients and methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background and aims

Patients and methods

Results

Conclusions

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