Novel regulators of kidney development from the tips of the ureteric bud

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Item Type:	Article
Title:	Novel regulators of kidney development from the tips of the ureteric bud
Creators Name:	Schmidt-Ott, K.M., Yang, J., Chen, X., Wang, H., Paragas, N., Mori, K., Li, J.Y., Lu, B., Costantini, F., Schiffer, M., Bottinger, E. and Barasch, J.
Abstract:	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.
Keywords:	Cell Differentiation, Cytokines, DNA-Binding Proteins, Genetic Databases, Epithelial Cells, Gene Expression Profiling, Kidney, Mesoderm, Organogenesis, Cytokine Receptors, STAT3 Transcription Factor, Signal Transduction, Trans-Activators, Animals, Mice, Rats
Source:	Journal of the American Society of Nephrology
ISSN:	1046-6673
Publisher:	American Society of Nephrology
Volume:	16
Number:	7
Page Range:	1993-2002
Date:	July 2005
Official Publication:	https://doi.org/10.1681/ASN.2004121127
PubMed:	View item in PubMed

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