title: Differential expression in normal-adenoma-carcinoma sequence suggests complex molecular carcinogenesis in colon.
abstract: The majority of colon cancers develop from pre-existing adenomas. We analyzed the expression profiles in the sequence of normal colon crypts, adenomas and early-stage carcinomas using microdissected cells from tubular adenomas with foci of malignant transformation. Differentially expressed genes were detected between normal-adenoma and adenoma-carcinoma, and were grouped according to the patterns of expression changes in the sequence. Down-regulated genes in the sequence included PLA2G2A, TSPAN1, PDCD4, FCGBP, AATK, EPLIN, FABP1, AGR2, MTUS1, TSC1, galectin 4 and MT1F. PLA2G2A has been shown to suppress colon tumorigenesis in mice, but the pathobiological role in humans has been controversial. Our data showed continuous down-regulation of PLA2G2A in the sequence supporting an implication in human colon cancer. Tumor suppressor and/ or proapoptotic activities have also been reported in other genes. Up-regulated genes included ribosomal proteins, IER3 and TPR. TGF-beta2 and matrix metalloproteinase 23B were up-regulated in carcinoma but not in adenoma, supporting the pathobiological roles in malignant transformation. Differentially expressed genes partly coincided with those in the adenoma-carcinoma sequence of the stomach, which was published previously, suggesting a partial overlap between the adenoma-carcinoma sequences of the colon and stomach.
authors.affiliation: Department of Pathology, Asan Institute for Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul 138-736, Korea.
authors.forename: Seungkoo
authors.initials: S
authors.lastname: Lee
authors.forename: Seunghyun
authors.initials: S
authors.lastname: Bang
authors.forename: Kyuyoung
authors.initials: K
authors.lastname: Song
authors.forename: Inchul
authors.initials: I
authors.lastname: Lee
mesh_terms: D000236:Adenoma / Q000378:metabolism* / Q000473:pathology; D002277:Carcinoma / Q000378:metabolism* / Q000473:pathology; D003106:Colon / Q000378:metabolism; D003110:Colonic Neoplasms / Q000378:metabolism* / Q000473:pathology; D018450:Disease Progression; D005753:Gastric Mucosa / Q000378:metabolism; D005786:Gene Expression Regulation; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008297:Male; D008875:Middle Aged; D020411:Oligonucleotide Array Sequence Analysis