Journal
JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY
Volume 24, Issue 5, Pages 727-743Publisher
AMER SOC NEPHROLOGY
DOI: 10.1681/ASN.2012070700
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Funding
- Marie Curie Career Integration Grant within the 7th European Community Framework Programme
- Deutsche Forschungsgemeinschaft (DFG) [KFO 201, SFB 992, P7, B5]
- Joint Transnational Grant-Bundesministerium fur Bildung und Forschung (BMBF)
- Excellence Initiative of the German Federal Government [EXC 294]
- Excellence Initiative of the German State Government [EXC 294]
- BMBF GerontoSys2-Project NephAge
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The molecular mechanisms that maintain podocytes and consequently, the integrity of the glomerular filtration barrier are incompletely understood. Here, we show that the class III phosphoinositide 3-kinase vacuolar protein sorting 34 (Vps34) plays a central role in modulating endocytic pathways, maintaining podocyte homeostasis. In mice, podocyte-specific conditional knockout of Vps34 led to early proteinuria, glomerular scarring, and death within 3-9 weeks of age. Vps34-deficient podocytes exhibited substantial vacuolization and foot process effacement. Although the formation of autophagosomes and autophagic flux were impaired, comparisons between podocyte-specific Vps34-deficient mice, autophagy-deficient mice, and doubly deficient mice suggested that defective autophagy was not primarily responsible for the severe phenotype caused by the loss of Vps34. In fact, Rab5-positive endosomal compartments, endocytosis, and fluid-phase uptake were severely disrupted in Vps34-deficient podocytes. Vps34 deficiency in nephrocytes, the podocyte-like cells of Drosophila melanogaster, resulted in a block between Rab5- and Rab7-positive endosomal compartments. In summary, these data identify Vps34 as a major regulator of endolysosonnal pathways in podocytes and underline the fundamental roles of endocytosis and fluid-phase uptake for the maintenance of the glomerular filtration barrier. J Am Soc Nephrol 24: 727-743, 2013. doi: 10.1681/ASN.2012070700
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