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Interleukin-4 and -13 promote basolateral secretion of H(+) and cathepsin L by glomerular epithelial cells.

Authors: Van Den Berg, JG  Aten, J  Annink, C  Ravesloot, JH  Weber, E  Weening, JJ 
Citation: Van Den Berg JG, etal., Am J Physiol Renal Physiol. 2002 Jan;282(1):F26-33.
Pubmed: (View Article at PubMed) PMID:11739109
DOI: Full-text: DOI:10.1152/ajprenal.00102.2002

Minimal change nephrosis (MCN) is characterized by massive proteinuria and ultrastructural alterations of glomerular visceral epithelial cells (GVEC). MCN has been associated with elevated production of interleukin (IL)-13 by circulating T lymphocytes and with T helper 2 lymphocyte-dependent conditions. We recently showed that GVEC express IL-4 and IL-13 receptors and that IL-4 and IL-13 increase transcellular ion transport over GVEC monolayers. We therefore hypothesized that IL-13 may directly injure GVEC. Here we demonstrate that IL-4 and IL-13 induce bafilomycin A1-sensitive basolateral proton secretion by cultured GVEC, indicating involvement of vacuolar H(+)-ATPase. The effects of IL-4 and IL-13 were accompanied by redistribution of the small GTPases Rab5b and Rab7, as shown by confocal immunofluorescence studies. Furthermore, Western blot analysis and assays for cysteine proteinase activity revealed basolateral secretion of the lysosomal proteinase procathepsin L by cultured GVEC, stimulated by IL-4 and IL-13. We speculate that IL-4 and IL-13 influence intracellular trafficking of proteins and promote proteolysis at the basolateral surface of GVEC, which may play a pathogenic role in altered glomerular permeability.

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RGD Object Information
RGD ID: 2290361
Created: 2008-03-10
Species: All species
Last Modified: 2008-03-10
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.