Increased expression of sonic hedgehog and altered methylation of its promoter region in gastric cancer and its related lesions

Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc
Li-Hui WangSeok-Hyung Kim

Abstract

The hedgehog (Hh) signaling pathway plays an important role in foregut development, and its activity is increased in various tumors, including those of the digestive tract. Our objective in the present study was to determine the pattern and extent of Sonic hedgehog (Shh) expression in gastric cancer and related lesions as well as the methylation status of its promoter region, in an attempt to clarify the regulatory mechanism of Shh expression. A total of 237 gastric cancers and related lesions (89 carcinomas, 22 high-grade dysplasia, 21 low-grade dysplasia, 47 intestinal metaplasia, 38 chronic gastritis, and 20 normal epithelia) were subjected to immunohistochemical analysis with the Shh monoclonal antibody. The methylation status of Shh was determined by methylation-specific PCR (MS PCR), involving bisulfate treatment of DNA from 150 tissues followed by amplification using specific primer pairs designed by our group. Shh was completely absent in the upper part of normal gastric epithelia (gastric pit cells), and no significant differences were observed among the lower parts of normal epithelia, chronic gastritis, and intestinal metaplasia. However, Shh expression was significantly elevated in neoplastic lesions, such as carcin...Continue Reading

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