title: Use of simplified transcriptors for the analysis of gene expression profiles in laser-microdissected cell populations.
abstract: Because colorectal epithelia are prone to malignant transformation, it is important to understand their normal regulation and then to identify differences between the normal cells and the transformed cells. We investigated the gene expression pattern along colonic crypts using a novel gene expression analysis strategy. We combined laser-mediated microdissection of distinct areas within colonic crypts and used modified RNA arbitrarily primed PCR to generate probes for cDNA array hybridization. In the basal part of the crypt, proliferation-related and cell cycle-related genes such as the multifunctional transcription factor e2f-1 or the mismatch-related gene p58/HHR23B were predominantly expressed. In the lumenal part of the crypt, up-regulations of the cysteine protease mch4 and the proto-oncogene c-jun were found. Our findings indicate that e2f1, p58/HHR23B, and mch4 may be involved in key mechanisms leading to malignant transformation in the colonic crypt. Our results also suggest that the technique elucidated here allows identification of gene expression patterns in distinct areas of intestinal tissue samples.
authors.affiliation: Department of Internal Medicine I, University of Regensburg, Regensburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Lechner
authors.forename: U
authors.initials: U
authors.lastname: Müller-Ladner
authors.forename: E
authors.initials: E
authors.lastname: Neumann
authors.forename: W
authors.initials: W
authors.lastname: Dietmaier
authors.forename: J
authors.initials: J
authors.lastname: Welsh
authors.forename: J
authors.initials: J
authors.lastname: Schölmerich
authors.forename: J
authors.initials: J
authors.lastname: Rüschoff
authors.forename: F
authors.initials: F
authors.lastname: Kullmann
mesh_terms: D001706:Biopsy; D003106:Colon / Q000473:pathology*; D016172:DNA Fingerprinting; D004210:Dissection / Q000379:methods*; D020869:Gene Expression Profiling; D006801:Humans; D007150:Immunohistochemistry; D007834:Lasers; D009693:Nucleic Acid Hybridization; D020411:Oligonucleotide Array Sequence Analysis; D000090063:Proto-Oncogene Mas; D012313:RNA / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016707:Tissue Fixation / Q000379:methods; D014158:Transcription, Genetic
chemical_list: C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D012313:RNA