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The presence of tissue specific precursor cells is an emerging concept in organ formation and tissue homeostasis. Several progenitors are described in the kidneys. However, their identity as a true stem cell remains elusive. Here, we identify a neonatal kidney‐derived c‐kit +  cell population that fulfills all of the criteria as a stem cell. These cells were found in the thick ascending limb of Henle's loop and exhibited clonogenicity, self‐renewal, and multipotentiality with differentiation capacity into mesoderm and ectoderm progeny. Additionally, c‐kit +  cells formed spheres in nonadherent conditions when plated at clonal density and expressed markers of stem cells, progenitors, and differentiated cells. Ex vivo expanded c‐kit +  cells integrated into several compartments of the kidney, including tubules, vessels, and glomeruli, and contributed to functional and morphological improvement of the kidney following acute ischemia‐reperfusion injury in rats. Together, these findings document a novel neonatal rat kidney c‐kit +  stem cell population that can be isolated, expanded, cloned, differentiated, and used for kidney repair following acute kidney injury. These cells have important biological and therapeutic implications.  S TEM  C ells  2013;31:1644–1656

C‐Kit + Cells Isolated from Developing Kidneys Are a Novel Population of Stem Cells with Regenerative Potential