title: Frequent CYP1A1 expression in gastric cancers and their related lesions.
abstract: CYP1A1 expression in various tissues of 43 gastric cancer cases was analyzed with frozen tissue array-based immunohistochemical staining (IHC), RT-PCR, Western blot analysis and EROD (7-ethoxyresourfin-O-deethylase) assay. CYP1A1 was detected immunohistochemically in 86% (37/43) of gastric cancers, in both 57% (4/7) of atrophic gastritis and intestinal metaplasia and in 7.7% (1/13) of non-cancerous mucosa. RT-PCR and Western blot analysis revealed coincident results with that of IHC and ruled out possible concurrent CYP1A2 expression. EROD assay showed increased CYP1A1/1B1 activity in either cancer or premalignant tissues but not in non-cancerous ones. The frequencies of CYP1A1 expression are significantly different between non-cancerous and premalignant (P<0.025) or cancer groups (P<0.005), suggesting that CYP1A1 is expressed at relatively early stage of gastrocarcinogenesis and exerts its effects throughout the stepwise oncogenic processes.
authors.affiliation: Cancer Institute and Laboratory of Cell Biology and Molecular Genetics, College of Basic Medical Sciences, Dalian Medical University, Dalian 116027, PR China.
authors.forename: Kai-Li
authors.initials: KL
authors.lastname: Zhang
authors.forename: Jing-Xin
authors.initials: JX
authors.lastname: Ma
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Chen
authors.forename: Yuan
authors.initials: Y
authors.lastname: Sun
authors.forename: Qing-You
authors.initials: QY
authors.lastname: Kong
authors.forename: Jia
authors.initials: J
authors.lastname: Liu
authors.forename: Hong
authors.initials: H
authors.lastname: Li
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis*; D015153:Blotting, Western; D019363:Cytochrome P-450 CYP1A1 / Q000096:biosynthesis*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D011230:Precancerous Conditions / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D019363:Cytochrome P-450 CYP1A1