Carcinogenesis of intestinal-type gastric cancer and colorectal cancer is commonly accompanied by expression of brain (fetal)-type glycogen phosphorylase.

Abstract:

:Our previous studies have demonstrated the significant enzymatic activity of glycogen phosphorylase (GP) in the gastric carcinoma and proliferating cells of particular intestinal metaplasia (IM). This paper reviewed the identification of the GP isoform in the gastrointestinal carcinoma, and the investigation on the role of this molecule in the gastrointestinal carcinogenesis. The only isoform expressed in gastric cancer was brain-type GP (BGP) using polymerase chain reaction (PCR) analysis. The expression of BGP, oncogene products and proliferating cell nuclear antigen in the gastric and colorectal carcinomas, their premalignant lesions, and the normal mucosa were examined using 136 gastric and 96 colorectal surgically resected specimens, and 55 endoscopically resected colorectal adenomas. The BGP visualized by immunohistochemistry was commonly present in intestinal-type gastric (80.6%) and colorectal (83.3%) carcinomas, whereas no BGP expression was seen in the normal human gastric and large intestinal mucosa except in the BGP foci described below. IMs with BGP had close correlation with intestinal-type gastric carcinoma, and some of them coexpressed accumulated p53 protein. The expression of BGP during 'adenoma carcinoma sequence' (ACS) showed excellent correlation with the increased dysplasia and was found prior to p53 expression. Positive staining in overtly normal looking colonic mucosa (BGP foci) was observed mainly around carcinomas without any adenoma component, and frequent p53 mutation (41.2%) was detected in the BGP foci using PCR-single strand conformation polymorphism analysis. It is suggested that BGP is a novel biomarker for carcinogenesis in the intestinal-type gastric carcinoma and in both of the pathways of ACS and the 'de novo' colorectal carcinoma.

journal_name

J Exp Clin Cancer Res

authors

Shimada S,Tashima S,Yamaguchi K,Matsuzaki H,Ogawa M

keywords:

subject

Has Abstract

pub_date

1999-03-01 00:00:00

pages

111-8

issue

1

eissn

0392-9078

issn

1756-9966

journal_volume

18

pub_type

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