ferred to 11733457 polyvinylidene fluoride membranes. The analyses were repeated three times. Statistical analysis Data were analyzed using GraphPad Prism software version 6.00 for Windows. Average values were expressed as mean 6 s.d. Statistical significance between different groups was determined by repeated-measures ANOVA test. A p value,0.05 was accepted as statistically significant. Results NNMT mRNA expression in OSCC To quantitatively explore NNMT mRNA expression in oral cancer cell lines, total RNA isolated from cells was subjected to Real-time PCR analysis as described under Materials. As shown in MTT assay Cell proliferation was determined using a colorimetric assay with 3–2,5-diphenyl tetrazolium bromide. The MTT assay measures the conversion of MTT to insoluble formazan by dehydrogenase enzymes of the intact mitochondria of living cells. After treatment with or without the appropriate plasmid, PE/CA-PJ15 cells were seeded in 96-well plates. Cells were allowed to attach overnight and cell proliferation was evaluated for up to 4 days by measuring the conversion of the tetrazolium salt MTT to formazan crystals. Western blot analysis NNMT Silencing Decreases Cell Tumorigenicity sponds to the known molecular mass of NNMT, with different levels of immunoreactive intensity. Weak or very weak NNMT bands were detected in four out of seven cell lines while strong NNMT bands were detected in three cell lines. Consistent with the results of Real Time-PCR, the strongest NNMT signal was observed in PE/CA-PJ15 cells. amounts showed that NNMT expression was markedly decreased in transfected samples compared with that detected in mock cells. Considering its remarkable silencing effect, pLKO.1448 plasmid was used for in vivo experiments. Effect of shRNA targeting NNMT on cell proliferation NNMT catalytic activity assay An HPLC-based catalytic assay was perform to analyze NNMT activity. In keeping with the results of Real-Time PCR and Western Blot analysis, the level 
of NNMT specific activity, expressed in U/mg protein, was particularly high in PE/CA-PJ15 compared to the other cell lines in which activity levels were lower or Sodium laureth sulfate undetectable. In most samples the activity was found to be below the detection threshold of the instrument. To examine the role of NNMT in tumor cell 17804190 metabolism, and analyze the biological effect associated with enzyme downregulation, shRNA vectors against NNMT were introduced into PE/ CA-PJ15 cells, and cell viability and colony formation were then assayed. The effect of NNMT silencing on cell proliferation was evaluated by MTT assay. As shown in Efficiency of RNA interference In order to modulate NNMT expression for functional assays, PE/CA-PJ15 cell line was stably transfected with four shRNA plasmids targeting different regions of NNMT mRNA, and control cells were treated with transfection reagent only, as described in Materials and Methods. To determine the specific effects of shRNA treatment on NNMT expression, the NNMT mRNA and protein levels were analyzed by Real-Time PCR and Western blot analysis, respectively. Compared with mock, both NNMT mRNA and protein levels were significantly reduced after transfection. Mean NNMT mRNA expression was 6.25-fold lower in transfected compared to mock cells. In keeping with the results of Real-time PCR, lanes loaded with equal protein Inhibition of in vivo tumor growth by NNMT downregulation To investigate whether NNMT plays a critical function in tumor formation in vivo, transfected a
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