Laminin alpha1 chain in human renal cell carcinomas and integrin-mediated adhesion of renal cell carcinoma cells to human laminin isoforms

The Journal of Pathology
Jan RissanenI Virtanen

Abstract

In human tissues, the laminin (Ln) alpha1 chain shows a restricted and developmentally regulated distribution in basement membranes (BMs) of a subset of epithelial tissues, including those of renal proximal convoluted tubules. The present study investigated the distribution of the Ln alpha1 chain in renal cell carcinomas (RCCs) and oncocytomas as well as in xenografted tumours induced in nude mice with four characterized RCC cell lines. These cell lines were also used in cell adhesion studies with purified laminins. By immunohistochemistry it was found that the Ln alpha1 chain is widely present in the BMs of RCCs, all of the specimens presenting immunoreactivity. High-grade RCCs tended to contain more BM-confined and stromal immunoreactivity than low-grade tumours, none of the grade 3 (G3) carcinomas being negative and all of the metastatic specimens showing partial or overall BM immunoreactivity. Double immunolabelling experiments showed that in RCC BMs but not in vessel walls, the Ln alpha1 chain was co-distributed with Ln alpha5, beta1, and beta2 chains, implying the presence of Ln-1/Ln-3 and Ln-10/Ln-11. In papillary RCCs, the Ln alpha1 chain co-localized with Ln-5. The oncocytomas lacked immunoreactivity for the Ln alpha1 ...Continue Reading

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Citations

Aug 21, 2007·Experimental Cell Research·Jon JonesRoman A Blaheta
Jun 1, 2005·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·Marko MäättäIsmo Virtanen
May 30, 2007·Laboratory Investigation; a Journal of Technical Methods and Pathology·Noora VainionpääIsmo Virtanen
Jul 16, 2011·Urologia Internationalis·M MaruschkeH-J Thiesen
Aug 3, 2004·Scandinavian Journal of Surgery : SJS : Official Organ for the Finnish Surgical Society and the Scandinavian Surgical Society·I Virtanen, V P Lehto

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