Interleukin-4 and interleukin-13 act on glomerular visceral epithelial cells
| Autor: | Den Berg, J. G., Jan Aten, Chand, M. A., Claessen, N., Dijkink, L., Wijdenes, J., Lakkis, F. G., Weening, J. J. |
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| Přispěvatelé: | Other departments |
| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Journal of the American Society of Nephrology, 11, pp. 413-422 Scopus-Elsevier Journal of the American Society of Nephrology, 11, 413-422 Journal of the American Society of Nephrology, 11(3), 413-422. American Society of Nephrology |
| ISSN: | 1046-6673 |
| Popis: | In minimal change nephrosis (MCN), proteinuria is associated with structural changes of the glomerular visceral epithelial cells (GVEC). The occurrence of MCN has been associated with 2 lymphocyte-dependent conditions. To examine a direct role for type 2 cytokines in GVEC injury, the expression of interleukin (IL)-4/IL-13 receptors by GVEC and direct effects of IL-4 and IL-13 on GVEC were studied. Reverse transcription-PCR showed that isolated human and rat glomeruli and cultured human and rat GVEC expressed mRNA for IL-4Ralpha, IL-13Ralpha1, and IL-13Ralpha2. Protein expression of [L-4Ralpha and IL-13Ralpha2 by GVEC in human kidney biopsies and by cultured human GVEC was detected by immunohistochemistry. Western blotting demonstrated phosphorylation of STAT6 in cultured GVEC upon incubation with IL-4 or IL-13. This indicated signal transduction via the heterodimeric receptor complex IL-4R2, which is composed of the IL-4Ralpha and the IL-13Ralpha1. Direct effects on GVEC function were examined in monolayer experiments. IL-4 and IL-13 dose-dependently decreased transepithelial electrical resistance of monolayers of rat GVEC to approximately 30 and 40% of baseline values, respectively. The transepithelial electrical resistance decrease was associated with a significant increase in short-circuit current, whereas no changes were observed in the transmonolayer flux of the macromolecules horseradish peroxidase (molecular weight, 44 kD) and 14C-mannitol (molecular weight, 182 Da). No changes in cell structure were observed with electron microscopy. It is concluded that by binding to specific IL-4/ IL-13 receptors, IL-4 and IL-13 can exert specific effects on GVEC function, which could be of pathogenetic relevance for glomerular injury in MCN |
| Databáze: | OpenAIRE |
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