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. 1994 May;144(5):1016–1022.

Expression of the VLA beta 1 integrin family in bladder cancer.

M Liebert 1, R Washington 1, J Stein 1, G Wedemeyer 1, H B Grossman 1
PMCID: PMC1887346  PMID: 8178925

Abstract

Integrins are a family of transmembrane heterodimers, many of which function as receptors for extracellular matrix molecules and play a role in adherence to and motility on matrix components. Because of these functions, integrins are suspected of participating in metastatic processes. We investigated the expression of beta 1 integrins in human bladder cancer cell lines and tissues. Expression of beta 1 integrins on cultured bladder cancer cell lines was evaluated by flow cytometry, of 8 cell lines tested, alpha 1 was found in 4, alpha 2 and alpha 3 in all 8, alpha 4 in 1, and alpha 5 in 3. These results were in sharp contrast to the expression detected by immunostaining tissues containing normal urothelium and low stage (noninvasive) and high stage (invasive) bladder cancers. All normal urothelial tissues tested expressed alpha 2 and alpha 3 and none expressed alpha 1, alpha 4, or alpha 5. Similarly, a majority (77%) of low stage (noninvasive) bladder cancers stained positively for alpha 3, whereas only 6 of 13 expressed alpha 2 and none expressed alpha 1, alpha 4, or alpha 5. Among invasive bladder cancers, alpha 1 was detected in 7%, alpha 2 in 24%, alpha 3 in 68%, alpha 5 in 10%, and alpha 4 was not found in any samples. These results indicate that integrin expression in cultured human bladder cancer cell lines does not represent expression observed in tissue samples and may reflect adaption to or selection during tissue culture conditions. A progressive loss of alpha 2 expression is seen from normal urothelial cells through invasive bladder cancers. This loss may contribute to an invasive phenotype by a loss of the cell-cell adherence function mediated by the alpha 2 beta 1 and alpha 3 beta 1 integrins.

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Selected References

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