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. 1992 Aug;66(2):318–322. doi: 10.1038/bjc.1992.263

Changes in expression of alpha 6/beta 4 integrin heterodimer in primary and metastatic breast cancer.

P G Natali 1, M R Nicotra 1, C Botti 1, M Mottolese 1, A Bigotti 1, O Segatto 1
PMCID: PMC1977802  PMID: 1503905

Abstract

The alpha 6/beta 4 integrin complex has been shown to be expressed in murine tissues at the basolateral aspect of most epithelial cells including the mammary epithelium, thus suggesting that this heterodimer may interact with components of the basement membrane. Because transformation of mammary epithelium frequently results in disappearance of basement membranes and loss of cell polarisation we have analysed in the present study whether expression of the alpha 6/beta 4 complex is altered in human breast tumours. The results of the present study confirm that in human mammary gland alpha 6 and beta 4 subunits colocalise at the basolateral aspect of the epithelium. While in benign breast lesions this distribution pattern remains mostly unchanged, in primary carcinomas the expression of both chains is either redistributed over the cells surface or significantly reduced. This altered pattern of expression is paralleled by the lack of detection of basement membrane laminin and collagen type IV. In metastatic lesions the expression of the heterodimer is maintained in most of the lymphnodal foci, but less frequently detected in metastasis localised in the pleural cavity and in parenchymal tissues. These findings indicate that in breast epithelium expression of the alpha 6/beta 4 heterodimer is modulated by the presence of basement membrane and is possibly influenced by microenvironmental factors as suggested by the different pattern of alpha 6/beta 4 expression in nodal and extranodal metastatic foci.

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Selected References

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