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The effect of BCSC-1 on proliferation was examined in two melanoma cell lines (Mewo and SK Mel 23) and in the cervical adenocarcinoma cell line (HeLa) used by (Martin et?al., 2003), all having undetectable endogenous BCSC-1 levels (Figure?S2B). We set up an in vitro system using lentiviral vectors resulting in stable expression of HA tagged BCSC-1short or BCSC-1 and green fluorescent protein (GFP) from a bicistronic promoter. FACS analysis of GFP protein was used to evaluate the percentage of infected cells (Figure?S2A). qRT-PCR and Western blot analysis confirmed that cells were overexpressing BCSC-1short or BCSC-1 (Figure?S2B). Although equivalent multiplicity of infection were used to transduce cells and infection gives rise to equivalent mRNA levels of both isoforms, BCSC-1short protein levels never reached the levels of BCSC-1 in any of the tested MM�Cderived cell lines. Proliferation was quantified http://www.selleckchem.com/products/Bortezomib.html 2?days after viral infection by measuring the cell number either using a CASY cell counting system (Figure?S3A) or by FACS analysis measuring the percentage of BrdU-positive cells (Figure?2A). BrdU incorporation showed that BCSC-1, but not BCSC-1short, decreased cell proliferation in Mewo, SK Mel 23, and HeLa cells, and the CASY count confirmed these data. Thus, BCSC-1 has antiproliferative effects in melanoma cell lines similar to http://www.selleckchem.com/products/gsk1120212-jtp-74057.html those described previously in breast cancer cell lines (Martin et?al., 2003). We next investigated whether the antiproliferative effect of ectopic BCSC-1 expression was attributed to an apoptotic effect or to a decrease in cell division. We analyzed the cell cycle by FACS using BrdU incorporation and 7-AAD staining. BCSC-1 as well as BCSC-1short expression did not affect http://www.selleck.cn/products/blu9931.html the percentage of apoptotic cells (Figure?2B). However, the expression of BCSC-1 in Mewo cells increased from 30�C50% (depending on the experiment) the number of cells blocked in G2/M (Figure?S3B). BCSC-1 involvement in the G2/M block was also observed in SK Mel 23 and HeLa cells (Figure?2B). To ascertain the role of BCSC-1 in vivo, we used B16F10 murine MM cells, which have no endogenous BCSC-1 expression. B16F10 cells overexpressing BCSC-1 or the empty vector (negative control) were injected into the tail vein of C57BL/6 mice. Seven days after the injection, we counted the number of melanin-positive tumor colonies on the surface of fresh lung. The mean count in control mice (n?=?10) was >200 tumor colonies/lung, whereas