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mblintl.com), anti-E-cadherin (1:1,000; clone DECMA-1, Abcam, Cambridge, UK, http://www.abcam.com), anti-Vimentin (1:500, clone V9, Abcam), anti-��-Tubulin (1:2,000; clone DM1A, Sigma-Aldrich), anti-mouse IgG-HRP (1:2,000; Santa Cruz), and anti-rat IgG-HRP (1:3,000; Dako, Glostrup, Denmark, http://www.dako.com/dk/index.htm). All data are presented as the mean �� SEM. Student's t test was used in the comparisons of two datasets, and p values http://www.selleckchem.com/products/MK-2206.html different dye efflux properties. P1 cells were dimly stained due to high efflux efficiency. http://www.selleckchem.com/products/ABT-263.html This staining could be inhibited by verapamil, an ATP-binding cassette protein transporter inhibitor, which induced a pronounced shift in the staining pattern. In contrast, P2 cells were brightly stained and their staining pattern was unaffected by verapamil (Fig. 1A). Subsequently, these two subpopulations were characterized for their surface marker expression by costaining with Hoechst 33342 and specific antibodies. The expression levels of various markers in the P1 and P2 populations are summarized in Supporting Information Table S2. These analyses established that P1 and P2 cells are demarcated by EpCAMhigh/CD133+ and EpCAMlow/CD133? expression patterns, respectively (Fig. 1B). The differential marker expression provides further indication that P1 and P2 represent physiologically distinct subpopulations within GIF-14. http://www.selleck.cn/products/Erlotinib-Hydrochloride.html The relative tumorigenicities of these subpopulations were tested in two complementary nude mouse allograft experiments. First, P1 and P2 cells were sorted from GIF-14 cells by FACS and briefly cultured in vitro for the recovery and expansion of the sorted cells. The isolated cells were checked for the maintenance of their Hoechst staining patterns and transplanted subcutaneously into separate abdominal sites on individual nude mice. As controls, unsorted GIF-14 cells were similarly transplanted into the neck region of each mouse. In the second study, clonal lines were established from sorted P1 and P2 cells, and representative lines were tested for their relative tumorigenicity in nude mice. These allograft assays showed that both pooled and clonal P2 cells were significantly more tumorigenic than P1 cells in vivo (Fig. 1C). FACS-enriched P1 and P2 cells were further assessed for their capacity for anchorage-independent growth in vitro (Fig. 1D).