Abstract
It has been suggested that STAT3 signaling plays important roles in regulating epigenetic aberrance during tumorigenesis, especially in the expression of certain key epigenetic enzymes such as DNMTs, HDACs, and HMTs. However, there has been no report on the relationship of STAT3 signaling and epigenetic aberrance in gastrocarcinogenesis. The purpose of this study was to explore the interrelationship of STAT3 signaling pathway and epigenetic aberrance in gastrocarcinogenesis. Immunohistochemistry was utilized to examine the protein expressions of pSTAT3, DNMT1, HDAC1, and EZH2 in 153 tissue specimens, including 20 of normal gastric epithelium tissue, 21 of intestinal metaplasia (IM), 24 of dysplasia (DYS), 23 of early gastric cancer (EGC) and 65 of advanced gastric cancer (AGC), and then analyze their possible relationship with clinicopathological factors. We found that the four protein expressions were obviously enhanced following the malignant process of gastric carcinogenesis. Pearson correlation analysis of all the pathological groups showed that expression of pSTAT3 was highly associated with DNMT1, but not with HADC1 and EZH2. However, significant correlations were detected among the expression of DNMT1, HDAC1, and EZH2. F...Continue Reading
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