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Am J Physiol Renal Physiol 282: F26-F33, 2002. First published August 8, 2001; doi:10.1152/ajprenal.0102.2001
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Vol. 282, Issue 1, F26-F33, January 2002

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

José G. Van Den Berg1, Jan Aten1, Carla Annink1, Jan H. Ravesloot2, Ekkehard Weber3, and Jan J. Weening1

Departments of 1 Pathology and 2 Cell Physiology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands; and 3 Institute of Physiological Chemistry, Martin Luther University, Halle-Wittenberg, Halle, Germany D-06097

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.

podocytes; minimal change nephrosis; vacuolar hydrogen-adenosinetriphosphatase; Rab guanosinetriphosphatases; cathepsins


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