The data were processed using the Statistical Package for the Social Sciences, version 16.0 (SPSS Inc., Chicago, IL, USA). One-way ANOVA was performed for comparison between different groups. Dunnett’s t (when homogeneity of variances existed) or Dunnett T3 (when heterogeneity of variances existed) was calculated. A P-value of < 0.05 was regarded as statistically significant difference. Results TNKS1 inhibition decreases cell growth and proliferation in NB cell lines XAV939 has been described as a potent, small molecule inhibitor of TNKS1 and 2 and could inhibit the growth of DLD-1 cancer

cells [14]. To elucidate the role of XAV939 in NB, we investigated how XAV939 affects cell proliferation in NB cell lines with different concentrations. After that, both SH-SY5Y cells and IMR-32 cells showed Bortezomib chemical structure reduction in cell proliferation after 24 h of treatment with 1 μM XAV939, with a maximum reduction at 72 h (Figure 1A, B). However, SK-N-SH cells showed the same effect only with 0.5 μM XAV939 treatment (Figure 1C). This anti-proliferative effect was dose and time dependent at 1, 5, 10 and 50 μM

selleck inhibitor at 24, 48 and 72 h. These results indicate that inhibition of TNKS1 by small molecule inhibitor attenuates NB cell proliferation. Thus 1 or 0.5 μM XAV939 were used depending on the cell lines for further assays. Figure 1 The cellular activity of SH-SY5Y, SK-N-SH and IMR-32 cells after XAV939 treatment at 24 h, 48 h and 72 h. A. The cellular activity of SH-SY5Y cells. B. The

cellular activity of IMR-32 cells. C. The cellular activity of SK-N-SH cells. P < 0.05. TNKS1 inhibition reduces SH-SY5Y cell survival To determine Dichloromethane dehalogenase whether TNKS1 inhibition reduces cell viability and survival of SH-SY5Y cells, we performed a colony formation assay in vitro. The number of colonies in the control and various treatment groups were counted and are summarized in Figure 2. From these results it is evident that the XAV939 caused 62.7% inhibition of colony formation in SH-SY5Y cells. In addition, we also observed the effect of shRNA for TNKS1 on cell colony formation. As shown in Figure 2, specific knockdown of TNKS1 by shRNA in SH-SY5Y cells resulted in a significant decrease (55.3%) in the number of colonies, as compared to SCR group (P < 0.01, Figure 2B). These results indicate that the growth inhibitory effects of XAV939 on SH-SY5Y cells are due to TNKS1-dependent inhibition. Figure 2 TNKS1 inhibition induces cell death in SH-SY5Y cells. A. The cell colony stained by 1% crystal violet in control gorup, XAV939 group, SCR group and shRNA group. B. The bar graph depicts the colony forming units(cfu) in different groups. *P < 0.01 compared to controls. TNKS1 inhibition induces apoptosis in NB cell lines Apoptosis plays an important role in both the cause and treatment of tumor [27]. The early apoptotic cells could be stainned by Annexin V, which located in the right lower quadrant (Figure 3A, E).