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- W2013984551 abstract "Summary: Accumulation of the extracellular matrix (ECM) in IgA nephropathy (IgAN) is thought to cause deterioration of glomerular function. Stromelysin and tissue inhibitor of matrix proteinase 1 (TIMP1) may play an important role in the turnover of the glomerular ECM. However, the expression of these enzymes in human renal tissues remains undefined. In the present study, non-radioactive in situ mRNA hybridization, which permitted the analysis at a cellular level, was performed to localize stromelysin and TIMP1 in renal tissue of IgAN. We also determined the percentage of cells positive for stromelysin or TIMP1 mRNA among intraglomerular cells. A total of 16 patients with IgAN were examined, including eight patients with severe histopathological changes and eight with mild changes. Three patients without glomerular disease were also studied. Stromelysin and TIMP1 mRNA were weakly expressed in the mesangium of normal kidneys and IgAN renal tissues with mild damage. However, the expression of both mRNA was significantly increased in the area of mesangial proliferation, in glomerular epithelial cells and in Bowman's capsule of advanced lesions. Several cells in the area of mesangial proliferation were double positive for stromelysin and TIMP1 mRNA, while certain cells positive for stromelysin mRNA did not express TIMP1 mRNA. In the interstitium, epithelial cells of certain tubules and some mononuclear cells were positively stained for these mRNA, especially in advanced lesions. Our results indicated that stromelysin and TIMP1 genes were expressed in glomerular resident cells, tubular epithelial cells and infiltrated mononuclear cells in IgAN, and their expression was enhanced in advanced tissue damage. the demonstration of a co-expression and discordant expression of the genes indicates that each gene expression may be regulated in a cell type-specific manner and that it could also be altered by cellular environmental factors." @default.
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- W2013984551 date "1995-04-01" @default.
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- W2013984551 title "In situ hybridization studies of stromelysin and tissue inhibitor of metalloproteinase 1 in IgA nephropathy" @default.
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- W2013984551 doi "https://doi.org/10.1111/j.1440-1797.1995.tb00017.x" @default.
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