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Published ahead of print on May 25, 2005
J Am Soc Nephrol 16: 1993-2002, 2005
© 2005 American Society of Nephrology
doi: 10.1681/ASN.2004121127
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Genetics and Development

Novel Regulators of Kidney Development from the Tips of the Ureteric Bud

Kai M. Schmidt-Ott*, Jun Yang*, Xia Chen*, Howard Wang*, Neal Paragas*, Kiyoshi Mori*, Jau-Yi Li*, Benson Lu{dagger}, Frank Costantini{dagger}, Mario Schiffer{ddagger}, Erwin Bottinger{ddagger} and Jonathan Barasch*

* Medicine; {dagger} Genetics and Development, Columbia University College of Physicians and Surgeons, New York, New York; and {ddagger} Department of Medicine, Mount Sinai School of Medicine, New York, New York

Address correspondence to: Dr. Jonathan Barasch, Department of Medicine, Columbia University College of Physicians and Surgeons, 630 W. 168th Street, New York, NY 10032. Phone: 212-305-1890; Fax: 212-305-3475; jmb4{at}columbia.edu

Received for publication December 23, 2004. Accepted for publication April 7, 2005.

Mammalian nephrogenesis depends on the interaction between the ureteric bud and the metanephric mesenchyme. As the ureteric bud undergoes branching and segmentation, the stalks differentiate into the collecting system of the mature kidney, while the tip cells interact with the adjacent cells of the metanephric mesenchyme, inducing their conversion into nephrons. This induction is mediated by secreted factors. For identifying novel mediators, the tips of the ureteric tree were isolated and microarray analyses were performed using manually refined, multistep gene ontology annotations. For identifying conserved factors, two databases were developed, one from mouse E12.5 and one from rat E13.5 ureteric buds. The overlap of mouse and rat data sets yielded 20 different transcripts that were enriched in the ureteric bud compared with metanephric mesenchyme and predicted to code for secreted proteins. Real-time reverse transcriptase–PCR and in situ hybridization confirmed these identifications. One of the genes that was highly specific to the ureteric bud tip was cytokine-like factor 1 (CLF-1). Recombinant CLF-1 in complex with its physiologic ligand, cardiotrophin-like cytokine (CLC), triggered phosphorylation of signal transducer and activator of transcription 3 in mesenchyme, a pathway characteristic of mesenchymal-to-epithelial conversion. Indeed, when applied to isolated rat metanephric mesenchyme, CLF-1/CLC (3 nM) induced mature nephron structures expressing glomerular and tubular markers. These results underline the power of this first comprehensive gene expression analysis of the ureteric bud tip to identify bioactive molecules.




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