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Acta Physiologica 2011; Volume 203, Supplement 686
Joint Congress of FEPS and Turkish Society of Physiological Sciences
9/3/2011-9/7/2011
Istanbul, Turkey
PRORENIN RECEPTOR IS ESSENTIAL FOR PODOCYTE AUTOPHAGY AND SURVIVAL
Abstract number: S5.4
Muller1 Dominik N
1Department of Experimental Medicine I, Nikolaus-Fiebiger-Center for Molecular Medicine, Friedrich-Alexander-University Erlangen-Nrnberg, Germany
2Experimental and Clinical Research Center (ECRC), an institutional cooperation between the Charit Medical Faculty and the MDC, Berlin, Germany
We investigated the role of the PRR in the maintenance of podocyte function. Generation of podocyte-specific PRR knockout mice (cKO) with the help of cre-loxP technique and phenotypical analyses. Generation of podocyte-specific PRR knockout mice (cKO) resulted in death of the animals between 23 weeks after birth. Within 14 days, cKO developed nephrotic syndrome, albuminuria with podocyte foot process fusion, and cytoskeletal changes. Podocyte-specific PRR deletion also led to disturbed processing of multivesicular bodies and enrichment of autophagosomal (LC3) and lysosomal (LAMP2) markers. The findings indicated a functional block in autophagosome-lysosome fusion and overload of the proteasome protein degradation machinery, as supported by p62 accumulation. In vitro PRR knockdown and pharmacological v-ATPase activity blockade increased vesicular pH with accumulation of LC3-positive and LAMP2-positive vesicles and altered cytoskeleton. Our findings suggest that the PRR is essential for podocyte function and survival by maintaining autophagy and protein turnover machinery. PRR plays a pivotal role in lysosomal pH control, which is important for podocyte survival and cytoskeletal integrity.
To cite this abstract, please use the following information:
Acta Physiologica 2011; Volume 203, Supplement 686 :S5.4