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Expression of three cell adhesion molecules in bladder carcinomas: correlation with pathological features
A Mialhe1, J Louis, D Pasquier
1Groupe de Recherches sur les Tumeurs de Vessie, Institut Albert Bonniot, Université Joseph-Fourier, Grenoble, France. agnes.mialhe@ujf-grenoble.fr
Summary
E-cadherin expression is a better indicator of bladder cancer invasiveness than integrins alpha 2 and beta 4. Aberrant expression of these cell adhesion molecules is linked to tumor progression in bladder carcinomas.
Area of Science:
- Oncology
- Cell Biology
- Biochemistry
Background:
- Cell adhesion molecules (CAMs) like E-cadherin and integrins (alpha 2, beta 4) play roles in tumor progression.
- Previous studies suggest a link between these CAMs and human bladder carcinoma development.
Purpose of the Study:
- To compare the expression patterns of E-cadherin, integrin alpha 2, and integrin beta 4 in bladder tumors.
- To investigate the correlation of these CAMs' expression with tumor grade and stage in bladder carcinomas.
Main Methods:
- Immunohistochemical analysis of 50 bladder tumor cryosections.
- Consecutive cryosection staining for E-cadherin, integrin alpha 2, and integrin beta 4.
- Correlation analysis with histological grade and tumor stage.
Main Results:
- Normal urothelium showed strong expression of all three CAMs.
- Non-invasive tumors had variable expression, with E-cadherin more frequent than integrins.
- Invasive tumors frequently showed aberrant expression of alpha 2 (81%), beta 4 (100%), and E-cadherin (75%).
- Loss of beta 4 expression correlated with higher tumor grade and invasion depth.
- E-cadherin expression strongly correlated with tumor stage, unlike alpha 2 and beta 4.
Conclusions:
- While integrins alpha 2 and beta 4 show altered expression in invasive bladder tumors, E-cadherin is a more reliable marker for invasiveness.
- E-cadherin expression levels are significantly associated with the stage of bladder carcinomas.