A quantitative immunofluorescence study of glomerular cell adhesion proteins in proteinuric states

The Journal of Pathology
R BainsD R Critchley

Abstract

Whenever there is heavy proteinuria, the glomerular epithelial cells, the podocytes, show dramatic morphological changes which clearly demonstrate changes in cell adhesion. However, there is little information on the types of cell adhesion molecules expressed in the normal human glomerulus. Assessments of changes in cell adhesion molecules in human proteinuria have been confined to semi-quantitative immunostaining for integrins, and the results have not been entirely consistent. This study sought first to define which cell adhesion molecules are present in the normal glomerulus, using indirect immunofluorescence and a panel of antibodies directed against transmembrane adhesion proteins and against several cytoplasmic proteins which are known to be involved in adhesion. A wide variety of integrins were detected, the dominant form being alpha 3 beta 1. The cytoplasmic focal adhesion proteins vinculin, talin, paxillin, p130CAS, and pp125FAK were detected, although vinculin appeared to be confined mainly to the mesangium. The only intercellular adhesion molecule detected in the vicinity of the slit diaphragm was ZO-1; the results imply that the slit diaphragm does not bear a close relationship to any other form of intercellular jun...Continue Reading

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