MUC2 methylation was measured using a methylation specific PCR assay as pre viously described. P The PCR selleck screening library products were separated on 2% agarose gels and visualized using ethidium brom ide staining. The methylation index of MUC2 was calculated by the following formula 100 methylated reaction. MI defined as MIHCC MINon HCC. Distilled water was used as negative control, DNA methylated by SssI methylase Inhibitors,Modulators,Libraries was used as positive control. Quantitative real time PCR analysis for MUC2 Total RNA was isolated from 74 HCC, adjacent normal tissues, and cultured cells. The first strand cDNA was synthesized from 2 ug of total RNA. Primer sequences of MUC2 for reverse transcription Inhibitors,Modulators,Libraries PCR reac tion were forward and reverse. Quantitative real time PCR were carried out by using the M��3000P QPCR System.
The cDNA was then used for qPCR in a Inhibitors,Modulators,Libraries 20 ul SYBR Premix Ex Taq. qPCR for MUC2 mRNA expression was performed under the following conditions 5 min at 95 C, 40 cycles of 30 seconds at 95 C, 30 seconds at 60 C, and 1 min Inhibitors,Modulators,Libraries at 72 C. As an internal control for qPCR, B actin mRNA expres sion was amplified from the same cDNA samples. All results were normalized to B actin amplification. CT values for triplicate reactions were averaged and relative MUC2 expression was determined with the comparative CT method, using average CT values for MUC2 and B actin. Statistical analysis All data were generated without knowledge of the clin ical status of the samples analyzed by SPSS 17. 0 software. Associations between cat egorical variables were examined by using the Pearson ��2 and Fisher exact tests.
Kaplan Meier analysis Inhibitors,Modulators,Libraries and the log rank test were performed to identify survival differences in HCC. A P value of less than 0. 05 was considered statistically significant. Results The levels of MUC2 mRNA in HCC and corresponding non tumor tissues To accurately selleck chem inhibitor quantify relatively MUC2 mRNA levels, we used a real time PCR assay in 74 HCC and matched non tumor tissues. Overall results of MUC2 mRNA are summarized in Figure 1. We found that MUC2 mRNA expression lower in HCC tissues than that in Non HCC tissues. MUC2 expres sion was significantly difference between HCC tissues and matching non tumor tissues. There was a decreased tendency for MUC2 expression from Non HCC tissues to HCCs, and more HCC samples showed lower MUC2 expression. Expression of MUC2 was elevated in only 23 of the 74 HCC patients but decreased in 51 of the patients. This would suggest that the loss of MUC2 gene expression is a critical re quirement for the development of HCC. Association of MUC2 mRNA with clinicopathologic features The relationship between MUC2 mRNA status and known clinicopathologic factors in 74 tumor tissues were examined.