Distribution of extracellular matrix receptors in various forms of glomerulonephritis

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
K ShikataY S Kanwar

Abstract

Integrins are heterodimeric transmembrane receptor glycoproteins consisting of alpha and beta subunits that mediate adhesion and interactions between cells and extracellular matrix. Such interactions may be perturbed in various pathologic states, resulting in the altered phenotypic expressions of the integrins in affected tissues. To ascertain the alterations in integrins in various renal diseases, their distribution was investigated in different forms of glomerulonephritis by indirect immunofluorescence and immunoelectron microscopy using specific antibodies directed against beta 1 integrins and integrin alpha v beta 3 (vitronectin receptor). In addition, the distribution of certain extracellular matrix components (ie, fibronectin, vitronectin, and type IV collagen) was examined. Integrin beta 1 and alpha v beta 3 were highly expressed in proliferating mesangial cells in immunoglobulin A nephropathy, membranoproliferative glomerulonephritis type I and diffuse proliferative lupus nephritis. Their putative ligands (ie, fibronectin, vitronectin, and type IV collagen) also were increased in the expanded mesangial regions. In immunoglobulin A nephropathy, integrin beta 1 and alpha v beta 3 were seen by immunoelectron microscopy to ...Continue Reading

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