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Loss of Sprouty1 Rescues Renal Agenesis Caused by Ret Mutation

Esteban J. Rozen^*, Hagen Schmidt, Xavier Dolcet, M. Albert Basson, Sanjay Jain and Mario Encinas^*

^* Cell Signaling and Apoptosis Group and Grup de Patologia Oncològica, Institut de Recerca Biomedica de Lleida, Lleida, Spain; Department of Craniofacial Development, King's College London, London, United Kingdom; and Department of Medicine, Renal Division, and HOPE Center for Neurodegenerative Diseases, Washington University School of Medicine, St. Louis, Missouri

Correspondence: Dr. Mario Encinas, Departament de Medicina Experimental, Laboratori d'Investigacio UdL/HUAV, Hospital Universitari Arnau de Vilanova, 1a planta, Rovira Roure, 80, Lleida 25198, Spain. Phone/Fax: +34-973702213; E-mail: mario.encinas{at}mex.udl.cat

Received for publication March 6, 2008. Accepted for publication August 11, 2008.

Renal morphogenesis requires a balance between positive and negative signals, which are provided in part by the receptor tyrosine kinase Ret and the putative tumor suppressor Sprouty1, respectively. Tyrosine 1062 of Ret is a binding site for several adaptor and effector proteins, such as Grb2/Sos/Ras, which activate the ERK pathway. Mice lacking Ret tyrosine 1062 nearly mimic the phenotype of Ret-knockout mice, which includes renal agenesis. Sprouty1 regulates Ret activity by modulating the ERK pathway, but the mechanism by which this occurs is uncertain. Here, we show that loss of Sprouty1 rescues the renal agenesis and early postnatal lethality caused by lack of Ret tyrosine 1062. The kidneys and lower urinary tracts of double-mutant mice developed normally. This effect was specific to the urinary system, because loss of Sprouty1 did not rescue the defects in the enteric nervous system characteristic of animals lacking Ret tyrosine 1062. These results suggest that Sprouty1 can modulate ERK signaling downstream of Ret, independent of Grb2/Sos/Ras, during renal morphogenesis.

Copyright © 2009 by the American Society of Nephrology. Online ISSN: 1533-3450 Print ISSN: 1046-6673