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Immunohistochemical and mutational analysis of FLASH in gastric carcinomas
Author(s) -
JEONG EUN GOO,
LEE SUNG HAK,
LEE HAE WOO,
SOUNG YOUNG HWA,
YOO NAM JIN,
LEE SUG HYUNG
Publication year - 2007
Publication title -
apmis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.909
H-Index - 88
eISSN - 1600-0463
pISSN - 0903-4641
DOI - 10.1111/j.1600-0463.2007.apm_706.x
Subject(s) - immunohistochemistry , pathology , biology , cancer research , medicine
FLASH was initially identified as a pro‐apoptotic protein that transmits an apoptosis signal during death receptor‐induced apoptosis. Additionally, diverse biologic roles of FLASH, including TNF‐induced NF‐κB activation, cell‐cycle progression and cell division, have been identified. Although such functions are important in cancer pathogenesis, little is known about the alterations of FLASH gene and FLASH protein expression in human cancers. In this study, we analyzed the expression of FLASH protein in 60 gastric adenocarcinomas by immunohistochemistry. We furthermore analyzed mutation of FLASH in exon 8, where two polyadenine tracts ((A)8 and (A)9) are present, by single‐strand conformation polymorphism (SSCP) assay in 184 gastric adenocarcinomas. By immunohistochemistry, FLASH protein expression in cancer cells was detected positively in 42 gastric carcinoma tissues (70%), whereas its expression in epithelial cells of normal gastric mucosa was shown as no or very weak intensity. Mutational analysis detected one FLASH mutation in the gastric carcinomas (0.5%). The increased expression of FLASH in the malignant gastric epithelial cells compared to the normal mucosal epithelial cells suggests that FLASH expression may play a role in gastric tumorigenesis. Also, the data suggest that somatic mutation of FLASH is a rare event in gastric carcinomas.