期刊
CELL STEM CELL
卷 2, 期 3, 页码 284-291出版社
CELL PRESS
DOI: 10.1016/j.stem.2008.01.014
关键词
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资金
- NIDDK NIH HHS [DK054364, DK73299, DK73628, DK39773] Funding Source: Medline
- NINDS NIH HHS [R37 NS033642] Funding Source: Medline
Understanding the mechanisms of nephron repair is critical for the design of new therapeutic approaches to treat kidney disease. The kidney can repair after even a severe insult, but whether adult stem or progenitor cells contribute to epithelial renewal after injury and the cellular origin of regenerating cells remain controversial. Using genetic fate-mapping techniques, we generated transgenic mice in which 94%-95% of tubular epithelial cells, but no interstitial cells, were labeled with either beta-galactosidase (lacZ) or red fluorescent protein (RFP). Two days after ischemia-reperfusion injury (IRI), 50.5% of outer medullary epithelial cells coexpress Ki67 and RFP, indicating that differentiated epithelial cells that survived injury undergo proliferative expansion. After repair was complete, 66.9% of epithelial cells had incorporated BrdU, compared to only 3.5% of cells in the uninjured kidney. Despite this extensive cell proliferation, no dilution of either cell-fate marker was observed after repair. These results indicate that regeneration by surviving tubular epithelial cells is the predominant mechanism of repair after ischemic tubular injury in the adult mammalian kidney.
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