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. 2011 Dec 29;16(1):160–173. doi: 10.1111/j.1582-4934.2011.01282.x

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© 2011 The Authors Journal of Cellular and Molecular Medicine © 2011 Foundation for Cellular and Molecular Medicine/Blackwell Publishing Ltd

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Fig 1 — Characterization of Cancer Stem Cells from human HCC tissues. (A) Real-time analysis of Oct 4, CD 133, Nestin, telom-erase, SSEA-4, AFP and CEA mRNA expression in HCC stem cell under self-renewal condition (HSC-SR), under differentiation (HSC-DF) and HepG2 HCC cells. All the markers are significantly up-regulated in HCC cancer stem cells. *P < 0.05 when compared with HepG2 group. (B) FACS analysis of HCC stem cells on day 1 before cell sorting. Results are given as the percentage of Oct-4 and CD133⁺ cells in the total population. In the histograms, the red line represents staining with Oct-4 or CD133 mAb, and the green lines represent the isotype control-matched mAb. (C) Cell lysates were obtained and immunoblotting analysis was performed for Oct-4, CD133, α-fetoprotein (AFP), CK-7, CK-19 and EpiCam using specific antibodies. The blots were stripped and reprobed for β-actin as a loading control and for quantitation. (D) StemTAG™ Alkaline Phosphatase assays performed at passage 4–6 HSCs and LSCs. HSC-SR and LSCs are maintained in an undifferentiated stage on specific culture dishes, as indicated by the high AP activity, thus confirming the self-renewal within these cells. (E) Formation of tumour spheres in HCC stem cells. In 1% FCS culture media 70–90% of the HSC-SR and HSC-DF became adherent after 7 days, with a minority of floating cells forming spheres composed of three to five cells. After an additional 7 days, the floating spheres were expanded to contain 15–20 HSC-SR cells, with bright appearance and sharp edge. (F) Immunocytochemistry for CD133 and AFP was performed in Normal liver stem cells (N-LSC), HepG2 cells, hepatocellular cancer stem cells growing under self-renewal conditions (HSC-SR) and differentiation conditions (HSC-DF). An increase in CD133 expression along with the enhanced expression of AFP is observed in HSC-SR and HSC-DF cells.

Fig 1 — Characterization of Cancer Stem Cells from human HCC tissues. (A) Real-time analysis of Oct 4, CD 133, Nestin, telom-erase, SSEA-4, AFP and CEA mRNA expression in HCC stem cell under self-renewal condition (HSC-SR), under differentiation (HSC-DF) and HepG2 HCC cells. All the markers are significantly up-regulated in HCC cancer stem cells. *P < 0.05 when compared with HepG2 group. (B) FACS analysis of HCC stem cells on day 1 before cell sorting. Results are given as the percentage of Oct-4 and CD133⁺ cells in the total population. In the histograms, the red line represents staining with Oct-4 or CD133 mAb, and the green lines represent the isotype control-matched mAb. (C) Cell lysates were obtained and immunoblotting analysis was performed for Oct-4, CD133, α-fetoprotein (AFP), CK-7, CK-19 and EpiCam using specific antibodies. The blots were stripped and reprobed for β-actin as a loading control and for quantitation. (D) StemTAG™ Alkaline Phosphatase assays performed at passage 4–6 HSCs and LSCs. HSC-SR and LSCs are maintained in an undifferentiated stage on specific culture dishes, as indicated by the high AP activity, thus confirming the self-renewal within these cells. (E) Formation of tumour spheres in HCC stem cells. In 1% FCS culture media 70–90% of the HSC-SR and HSC-DF became adherent after 7 days, with a minority of floating cells forming spheres composed of three to five cells. After an additional 7 days, the floating spheres were expanded to contain 15–20 HSC-SR cells, with bright appearance and sharp edge. (F) Immunocytochemistry for CD133 and AFP was performed in Normal liver stem cells (N-LSC), HepG2 cells, hepatocellular cancer stem cells growing under self-renewal conditions (HSC-SR) and differentiation conditions (HSC-DF). An increase in CD133 expression along with the enhanced expression of AFP is observed in HSC-SR and HSC-DF cells.