Glucosamine Research Today is a free monthly online journal that collates and summarizes the latest research about Glucosamine, including details on chondroitin sulfate, uses, effects, benefits, arthritis. | ||||||||
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Primary human glomerular endothelial cells produce proteoglycans, and puromycin affects their posttranslational modification.Björnson A, Moses J, Ingemansson A, Haraldsson B, Sörensson J Dept. of Nephrology, Göteborg Univ., Sahlgrenska Univ. Hospital, SE-413 45 Gothenburg, Sweden. Anna.Bjornson@kidney.med.gu.se This article describes the possible role of the endothelial cell-surface coat, containing proteoglycans (PGs) with connected glycosaminoglycans (GAGs), in maintaining glomerular permselectivity. Primary human glomerular endothelial cells (HGEC) in culture were treated with the nephrosis-inducing agent puromycin aminonucleoside (PAN). Analysis was made by TaqMan real-time PCR, Western blot analysis, and by metabolic labeling with [(35)S]sulfate. The HGECs express several PGs: syndecan, versican, glypican, perlecan, decorin, and biglycan, which may contribute to the glomerular charge barrier. PAN treatment downregulated both the protein expression (by 25%) and the mRNA expression (by 37 +/- 6%, P < 0.001, n = 8) of versican compared with control. Transferases important for chondroitin and heparan sulfate biosynthesis were also significantly downregulated by PAN, resulting in less sulfate groups, shorter GAG chains, and reduced PG net-negative charge. Moreover, analysis of the cell media after PAN treatment revealed a reduced content of [(35)S]sulfate-labeled PGs (40% of control). We conclude that PAN may cause proteinuria by affecting the endothelial cell-surface layer and not only by disrupting the foot process arrangement of the podocytes. Thus the endothelium may be a more important component of the glomerular barrier than hitherto acknowledged. Published 8 March 2005 in Am J Physiol Renal Physiol, 288(4): F748-56.
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