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25 ?g/500 ?l Phycoerythrin (PE)-conjugated anti-mouse Ly-6A/E (Sca-1) (eBioscience) in Phosphate Buffered Saline (PBS) solution with 1% Bovine Serum Albumin (BSA) for 0.5�C1 hour. Flow cytometry was performed using the BD FACS Canto and analyzed by CellQuest software. Cell sorting was conducted on a BD FACS Vantage (BD Biosciences, San Jose, CA, http://www.bdbiosciences.com). Prostates from 6- to 8-week-old mice were digested for 3 hours at 37��C in Dulbecco's modified Eagle's medium (DMEM)/F12/Collagenase/Hyaluronidase/fetal bovine serum (FBS) (Stem Cell Technologies, Vancouver, Canada, http://www.stemcell.com) followed by 1 hour digestion with 0.25% Trypsin-EDTA (Invitrogen, Carlsbad, http://www.selleckchem.com/products/cb-839.html CA, http://www.invitrogen.com) on ice. Cells were suspended in Dispase (Invitrogen, 5 mg/ml) and DNase I (Roche Applied Science, Indianapolis, IN, http://www.roche.com, 1 mg/ml), and pipetted vigorously. Dissociated cells were passed through 70 ?m cell strainers (BD Biosciences). Dissociated cells (1 �� 105) were mixed with equal numbers of mouse urogenital sinus mesenchymal (UGSM) cells, resuspended in rat-tail collagen and setting solution (0.34 M NaOH/DMEM?=?1:1.9, volume ratio) as previously described [37], and incubated at 37��C overnight in BFS media (DMEM/5% FBS/5% Nu-serum/5 ?g/ml insulin/10?8 M 5�� dihydrotestosterone). The next day, collagen pellets were grafted under the kidney capsule of male NOD/SCID mice while 12.5 mg testosterone pellets were inserted subcutaneously; grafts were analyzed after 2 months. Day 0- and 2-week-old prostate tissues were homogenized in 1 ml Trizol LS reagent (Life Technology, Carlsbad, CA, http://www.lifetechnologies.com). http://www.selleck.cn/products/wnt-c59-c59.html P1 prostate spheres were disassociated into single-cell suspensions and lysed in 1 ml Trizol LS reagent. RNA was extracted using 200 ?l chloroform per 1 ml Trizol lysate, and isopropanol precipitated. RNA (0.5�C1 ?g) was annealed with 1 ?g Oligo (dT) 15 Primer (Promega, Madison, WI, http://www.promega.com) at 70��C and then subjected to cDNA synthesis using 200 units/reaction M-MLV Reverse Transcriptase (Promega) for 50 minutes at 42��C. cDNA diluted 1:20�C50 was used as templates for quantitative PCR (qPCR). Real-time qPCR was done with GoTaq qPCR Master Mix (Promega). qPCR was performed on Mx3000P QPCR System (Agilent Technologies, Santa Clara, CA, http://www.home.agilent.com) and analyzed with http://www.selleckchem.com/products/BI6727-Volasertib.html MxPro QPCR Software (Agilent Technologies). Primers are listed in Supporting Information Methods. Lentiviral-TOP-dGFP-reporter (Addgene, Cambridge, MA, http://www.addgene.org) was used to produce Lentivirus. Virus production and infection were performed as described previously [38]. Chromatin immunoprecipitation (ChIP) assays were done on P2 and P3 prostate spheres using SimpleChIP Enzymatic Chromatin IP Kit (Cell signal, Danvers, MA, http://www.cellsignal.com) and following the included protocol. Analysis was performed using Student's t test, with p?