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INVITED REVIEW

Developmental approaches to kidney tissue engineering

Departments of Medicine, Pediatrics, and Cellular Molecular Medicine, University of California, La Jolla, California 92093-0693

Recent advances in our understanding of the developmental biology of the kidney, as well as the establishment of novel in vitro model systems, have potential implications for kidney tissue engineering. These advances include delineation of the roles of a number of growth factors in the developmental programs of branching morphogenesis and mesenchymal differentiation, a new understanding of the roles of the extracellular matrix, identification of potential "renal" stem cells, the ex vivo propagation and subsequent recombination of isolated components of the kidney, and successful transplantation of renal primordia into adult hosts. This review will examine these advances in the context of approaches to tissue engineering. Finally, novel approaches that synthesize advances in both cell-based and organ-based approaches are proposed.

kidney development; in vitro; organ culture

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