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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell+Stem+Cell 2015 ; 16 (6): 627-38 Nephropedia Template TP
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Krt19(+)/Lgr5(?) cells are radioresistant cancer initiating stem cells in the colon and intestine #MMPMID26046762
Asfaha S; Hayakawa Y; Muley A; Stokes S; Graham TA; Ericksen R; Westphalen CB; von Burstin J; Mastracci TL; Worthley DL; Guha C; Quante M; Rustgi AK; Wang TC
Cell Stem Cell 2015[Jun]; 16 (6): 627-38 PMID26046762show ga
The colonic and intestinal epithelium are renewed every 3 days. In the intestine there are at least two principal stem cell pools. The first contains rapid cycling crypt based columnar (CBC) Lgr5+ cells, while the second is comprised of slower cycling Bmi1-expressing cells at the +4 position above the crypt base. In the colon, however, the identification of Lgr5-negative stem cell pools has proven more challenging. Here, we demonstrate that the intermediate filament, keratin-19 (Krt19), marks long-lived, radiation resistant cells above the crypt base that generate Lgr5+ CBCs in the colon and intestine. In colorectal cancer models, Krt19+ cancer initiating cells are also radioresistant while Lgr5+ stem cells are radiosensitive. Moreover, Lgr5+ stem cells are dispensable in both the normal and neoplastic colonic epithelium, as ablation of Lgr5+ stem cells results in their regeneration from Krt19 expressing cells. Thus, Krt19+ stem cells are a discrete target relevant for cancer therapy.