title: Gene expression and the biological phenotype of papillary thyroid carcinomas.
abstract: The purpose of this paper is to correlate the molecular phenotype of papillary thyroid carcinoma (PTC) to their biological pathology. We hybridized 26 PTC on microarrays and showed that nearly 44% of the transcriptome was regulated in these tumors. We then combined our data set with two published PTC microarray studies to produce a platform- and study-independent list of PTC-associated genes. We further confirmed the mRNA regulation of 15 genes from this list by quantitative reverse transcription-PCR. Analysis of this list with statistical tools led to several conclusions: (1) there is a change in cell population with an increased expression of genes involved in the immune response, reflecting lymphocyte infiltration in the tumor compared to the normal tissue. (2) The c-jun N-terminal kinase pathway is activated by overexpression of its components. (3) The activation of ERKK1/2 by genetic alterations is supplemented by activation of the epidermal growth factor but not of the insulin-like growth factor signaling pathway. (4) There is a downregulation of immediate early genes. (5) We observed an overexpression of many proteases in accordance with tumor remodeling, and suggested a probable role of S100 proteins and annexin A2 in this process. (6) Numerous overexpressed genes favor the hypothesis of a collective migration mode of tumor cells.
authors.affiliation: Institute of Interdisciplinary Research, School of Medicine, Université Libre de Bruxelles, Campus Erasme, Brussels, Belgium. laurent.delys@ulb.ac.be
authors.forename: L
authors.initials: L
authors.lastname: Delys
authors.forename: V
authors.initials: V
authors.lastname: Detours
authors.forename: B
authors.initials: B
authors.lastname: Franc
authors.forename: G
authors.initials: G
authors.lastname: Thomas
authors.forename: T
authors.initials: T
authors.lastname: Bogdanova
authors.forename: M
authors.initials: M
authors.lastname: Tronko
authors.forename: F
authors.initials: F
authors.lastname: Libert
authors.forename: J E
authors.initials: JE
authors.lastname: Dumont
authors.forename: C
authors.initials: C
authors.lastname: Maenhaut
mesh_terms: D017306:Annexin A2 / Q000502:physiology; D002291:Carcinoma, Papillary / Q000235:genetics* / Q000473:pathology; D020869:Gene Expression Profiling; D017781:Genes, Immediate-Early; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases / Q000235:genetics; D009361:Neoplasm Invasiveness; D020411:Oligonucleotide Array Sequence Analysis; D010641:Phenotype; D020133:Reverse Transcriptase Polymerase Chain Reaction; D009418:S100 Proteins / Q000502:physiology; D015398:Signal Transduction; D012984:Software; D013964:Thyroid Neoplasms / Q000235:genetics* / Q000473:pathology
chemical_list: C472822:ANXA2 protein, human; D017306:Annexin A2; D009418:S100 Proteins; D048031:JNK Mitogen-Activated Protein Kinases